Friday, May 3, 2013
We were out doing research one day and we were walking down one of the streams leading to the Guadalupe River and I saw this little cricket frog (Acris gryllus) and I caught him and then make a joke that he was my friend because he wasn't jumping out of my hand. Then when I tried to let him go he came swimming back to me so I picked him up one more time. While Dr. Distel was talking he notice the frog was in my hand and told me to to let the frog go and I told him I would have but it came bac to me. Soon after the frog turns around and jumps on me, scaring me a bit. I had no idea where it went I was just tod to hold still. The picture above is the result of my story :), once I looked down I took him off and said my farewell and we moved on. MY LITTLE BUDDY. ---- Schreiner University
Thursday, May 2, 2013
I caught this Tree Lizard (Urosaurus ornatus) outside of my house sunning itself on a rock
wall. It was one of the more difficult lizards I have attempted to catch by
hand because it is so quick. The lizard itself was a large male adult, roughly
five inches, being nearly the max size for this species. I could tell it was a
male from the blue coloring on its underside which was quite vibrant at the
time I caught this lizard. Even though this is a common species in the area
this is the first time I have managed to catch and identify a member of the
species. The coloring of this lizard against the white rock wall it was resting
on was how I managed to spot this Tree lizard in the first place. I handled the
lizard for about five minutes or so attempting to identify it and take the best
quality photo I could with an iPhone then released it on the rock wall where I found
it. After had released the lizard the animal decided it needed to do a few
pushups before scurrying off behind the rock wall.
Wednesday, May 1, 2013
Article Review: Female Eastern Hog-Nosed Snakes (Heterodon platirhinos) choose nest sites that produce offspring with phenotypes likely to improve fitness
This article is about a study done to determine if female Eastern Hognose snakes actively choose their nesting sites based upon temperature to promote the development of healthier offspring. To do this, the researchers first had to determine the average temperatures of nest sites in the wild. So, they located 21 nests and placed temperature recording devices next to the eggs. They also placed one of these devices at a similar location 50 m away from each nest, but at the same depth as the actual nest. This was done to find the temperatures of other possible nest sites in which the snakes could have laid their eggs. This research led the scientists to determine that the average temperature of actual nest sites was 24.6 degrees Celsius, while the average temperature of the possible nest sites was 22.2 degrees Celsius.
During the second year of the study, the researchers collected eggs from 8 nests. Half of the eggs were then incubated at 24.6 degrees Celsius and the other half at 22.2 degrees Celsius. Just after hatching, the snakes were taken from the nests and their responses at being handled were recorded and scored. No response by the snakes was given a score of 0, hissing was scored a 1, body flattening was scored a 2, an attempt to flee was given a 3, striking at the handler was given a 4, and the trick of playing dead was given a 5. If the baby hognose snake did more than one of these responses, it was given the cumulative score of both. Therefore, each snake could score up to 15 points. At 3 days after hatching, snout-vent length, weight and swimming speed was also recorded to determine the physical fitness of each hatchling.
From this research, the scientists determined that both the over-all average temperature and the hourly average temperatures were higher for actual nest sites than for the other possible nests sites, showing that the females hognose snakes probably do attempt to lay their eggs in warmer locations. The second part of this research showed that the two different incubation temperatures did not affect hatching success rates or cause differences in the number of responses due to handling. However, the eggs that were incubated at the lower temperature did hatch an average of 13 days later than the eggs in the higher temperature. Also, the snakes from the higher temperature incubator swam faster and were on average longer than the snakes from the lower temperatures.
This research is significant because it shows that female hognose snakes can choose warmer locations to lay their eggs. This can lead to larger-hatching and faster snakes, which have a better chance of survival from predators. They also hatch earlier, which will give them more time to eat and store energy in preparation for hibernation, which occurs pretty soon after hatching for this species.
Title: Female Eastern Hog-nosed Snakes (Heterodon platirhinos) choose nest sites that produce offspring with phenotypes likely to improve fitness
Authors: C. A. Peet-Pare and G. Blouin-Demers
Journal: Canadian Journal of Zoology
http://www.nrcresearchpress.com/doi/abs/10.1139/z2012-091#.UYHiO-rD_mJ
Hanging out with the Green Anole
The Green Anole
Camera Phone Quality Picture...
I see this awesome animal very often. Right outside my house I see anoles climbing on the building and through the bushes. I love to sit outside and watch them perform their curious and entertaining activities. My cat is also a very big fan of watching the anoles but I assume she does so for a different reason. The anoles that are displaying the brilliant green coloration and the vibrant pink dewlaps are such a good looking lizard. While brown or green they both blend in so well to the bushes outside my house. It really is amazing how hard it could be to see one in the bushes. That is, until they move around. Once they move I spot them and I enjoy watching them crawl effortlessly through the bushes. Often times I see their territorial displays. Sometimes there are so many that it is hard to keep track of which one is located where. I'm sure if I grew up down south I might not find them as interesting and entertaining as I do, but I didn't have the luxury of abundant lizards crawling around my house as a child. If I were to nominate a 'class mascot' I would chose the Green Anole. Mostly because of the fact that I like them so much but also because they are very interesting and very common in our area.
The Green Anole, the only anole species in South Carolina, is identified by its green and/or brown coloration and the throat fan. The scientific name of the species is Anolis carolinensis. Both males and females have a throat fan called a dewlap. The dewlap can vary in colors which include pink and white. This anole had just climbed down the building and was signaling another anole which was of the brown coloration at the time. It was using head bobs and displayed its' pink dewlap to another anole nearby. This would tell me that it was a male because they often use these mechanisms to display their dominance and to protect their territory. The anole can most often be seen climbing in trees, bushes, buildings, and fences. The anole is seldom is found on the ground. They have toe pads which allow them to be an efficient arboreal lizard. I'm glad for the abundance of anoles at my house due to the fact that they eat lots of insects and spiders. The Green Anole ranges in size from 5-8 inches long. The one in particular, pictured earlier, I would guess to be a younger anole because it seemed to be around 5 inches long. Hatchlings are reported to be about 2 inches long, so this would tell me it was not a very young anole.
Reference - Patterson Field Guides: Reptiles and Amphibians of Eastern and Central North America, by Conant and Collins.
Natural history: Herping in South Florida
My family and I just returned from a visit with the in-laws in Delray Beach, FL. Amidst the suburban sprawl that is south Florida lies tucked an amazing gem, Green Cay Nature Center and Wetlands. Part of the Palm Beach County parks system, this 100 acre preserve features a mile and half of elevated boardwalk over wetlands with a stunning density and diversity of wildlife. We took the kids, slathered on sunscreen, and set out to see what we could see.
And see we did!
I was excited to spot this Florida softshell just off the boardwalk. Check out the characteristic dark blotches on the carapace. Apalone ferox is larger than our other softshells, so at 10" or so this individual could be a small female or a large male.
Florida softshell turtle, Apalone ferox |
Pig frog, Lithobates grylio |
Pig frogs were abundant in the area, calling everywhere but seldom seen. We did finally manage to find one.
While looking for pig frogs in a patch of water lilies, I noticed an alligator right under the boardwalk beneath my feet. This good sized gator was at least 6' long. We watched it cruise through the water and over to the lily pads where we'd heard the pig frogs. Look out frogs!
American alligator, Alligator mississippiensis |
Kids checking out said gator under the boardwalk |
The invasive brown anole, Anolis sagrei, is now the most common anole in south Florida. We spotted a female first and then, just a few inches away, a male. The dewlap is orange rather than the pink we see in our native green anole.
Brown anole, Anolis sagrei, male |
Anolis sagrei, female |
Several turtles were out, swimming and sunning. Although some were difficult to identify, being mostly underwater or covered with algae, a few were distinguishable as Florida redbelly turtles, Pseudemys nelsoni, based on the thick red bars on the carapace and relatively few lines on the head.
Florida redbelly turtles, Pseudemys nelsoni |
The highlight of our visit was watching a great egret, Ardea alba, capture and consume a skink. Scads of egrets and herons were around, and we'd spent plenty of time watching them already. In a small upland area, we came across a great egret so still that the kids thought that maybe, just maybe, it was a statue. Then the statue moved. Just a bit. Then statue again. Then, pounce!
Great egret, Ardea alba, with southeastern five-lined skink, Plestiodon inexpectatus |
When the egret raised its head again, we could see something writhing in its beak. A lizard!
We watched in awe, and I snapped some photos hoping to identify the lizard later. My non-herpetologist spouse confirmed that it was shiny with a long, but not blue, tail. An adult skink of some sort.
Fortunately, a couple of photos showed the underside of the tail well enough that, when zoomed in, I could see that the scales were of uniform size. This feature, along with the lined pattern on the dorsum, convinced me that the unfortunate victim was a southeastern five-lined skink, Plestiodon inexpectatus.
Southeastern five-lined skink, Plestiodon inexpectatus, in the beak of a great egret. The scales down the middle of the tail's underside are similar in width to those on either side.
|
The skink put up a good fight -- thrashing, writhing and biting at the giant bird's beak. Eventually we noticed that the tail seemed to have detached.
Great egret (Ardea alba) and southeastern five-lined skink (Plestiodon inexpectatus)
|
But tail autotomy was futile. Rather than allowing the ill-fated squamate to escape, the egret deftly held both tail and body in its beak, then rapidly dropped the tail and downed the body in a gulp. The skink's tail thrashed on the ground at the great bird's feet, until the egret leisurely plucked it up and manipulated it into its maw. Then the egret strode slowly away as our attention turned to a racoon a few feet away.
We continued along the boardwalk, observing more egrets, herons, cormorants, anhingas, stilts, gallinules, and even a roseate spoonbill. But those are birds, so you won't hear about them here.
Am I a juvenile Florida redbelly turtle (Pseudemys nelsoni)? Probably, but this algae on my carapace makes it hard to tell. |
When we finally left, the kids were tired of walking and ready for their overdue lunch. But we were filled with great memories and stories of our fabulous finds.
http://www.co.palm-beach.fl.us/parks/locations/greencay.htm
http://myfwc.com/wildlifehabitats/nonnatives/reptiles/brown-anole/
http://srelherp.uga.edu/turtles/psenel.htm
ARITCLE REVIEW: Crocodilian Behavior: a window to dinasour behavior?
Parental Care
An International Journal of Paleobiology
Crocodilian Behavior: a window to dinasour behavior
Authors
Peter Brazaitis and Myma E. Watanabe
A phylogenetic tree is ordered traits that are considered to be ancestrial and traits that are considered to be derived. Understanding what traits are derived and what traits are considered to be ancestrial is valuable when infering relationships among organisms past and present. Dinasours as we all know are extinct because of this behavioral and structural traits can not be directly or physically observed. One has to look at phylogenetic relationships in order to understand some of these behavior and structural traits. This article compares similarities between Aves and Crocodylia along with phylogenetic relationships between Aves Crocodylia and Dinasours. the comparison the article infers behavioral and structural similarites found in dinsaours Crocodylia origins can be traced back to the early Triasic period.
Crocodylia and Aves are the only current living representatives of the Archosauria. Understanding similarities in structures and behavior among these two groups can give more in depth information on what traits are considered to be ancestral traits and what traits are considered to be derived.
Crocodylia and Dinosaurs common ancestor is closely related to Euparkeria. The common ancestor split into two different lineages one being Crurotarsi which lead to Crocodylia and Ornithodira which lead to Aves and Dinosaurs. This phylogenetic relationship among Aves, Crocodylia and Dinosaurs allows the article to argue that the behavioral similarities between Aves and Crocodylia would be an ancestral trait that would be present in Dinasours as well.
The Biogeography of Crocodylia also supports the age of crocodylia's phylogeny. Crocodilya have a wide distribution across the globe. Crocodylia do not do well in salt water and would be unable to cross the vast oceans of current continental positions. The origin of the distributions can be traced back to Pangaea and Gondwanan. The source of origin of the species would be very hard to trace back past Pangaea considering the different Continental structures over history. One can conclude that the physical structure of Crocodylia would be a restraint when dealing with Quantum Dispersal. Because of this Diffusion as a dispersal method would be more appropriate in understanding Crocodylia's distribution.
Similarities between Aves and Crocodylia would be Amino acid Structures in B- Keratin. Crocodylia and most Aves make vocal communications. Seasonal change in oviducts of the American Alligator coincides with similar homologous structures found in birds.
Alligator communication can be shown through the variation in types of calls
The similarities between Aves and Crocodylia vocalization gives evidence in support for Dinosaur vocalization. Similarities in female size and egg size of birds and crocodylia gives evidence for the article to hypothisize that some Dinosaurs like Oviraptor, Citipati, Troodontid, Oviraptor, and Troodon had male parental care. Calcium deposite found in fossil bones near or on nesting sites showed no reapsoption. Females would have reapsorption of calcium in the bone from laying eggs.
The article gives great evidence for relationships between Crocodilian behaviors and Dinosaur behaviors. The article also supports parental care in Dinosaurs. The one issue I found in the article is the ability to characterize whether or not male or female parental care. The fossils calcium level could be affected in the fossilization process or the years of weathering since then. Also what if male and female Dinosaurs shared nest attendance responsibilities. Showing the presences of male nest attendances does not rule out female parental care. The article is a great example on how phylogenetic trees can take a look into the past, and gives reasoning for conservation of all species not only the ones subjected in the comparisons. Behavioral studies cannot be present in an organism that is extinct. Understanding current living behavior characteristics could give look into the past, so conservation of all species is imperative for future advances in science.
By
Philip Melton
Slovakia Shows Love For Toads
Our last class lecture focused on conservation of reptile
and amphibian habitat and in the town of Striebornica, located in Slovakia, our
classroom information is being put to work, as local volunteers are doing their
part to assist Europe toads. Since 1988 volunteers have banded together to help
toads migrate across a busy road which separates the toads’ winter habitat from
the reservoir. Volunteers help collect these toads in bucks of water,
count the toads, and then release the toads into the reservoir. The toad counts
have become disheartening because population numbers have decreased from
several thousand to 1000, since the volunteer project began. A 700 meter
barrier was placed between the roadway and the wintering grounds to prevent the
toads from cross on their own. Cross the busy road would almost certainly mean
death for the toad. The article is written as a civic engagement piece,
designed to encourage participation for this event. The article tries to
perhaps encourage conservation efforts, like this one, to take place in other
areas. While the translation of this article to English is a bit shaky I
believe this article is a wonderful example a community coming together to care
for its local amphibian population.
this article can be viewed at : http://spectator.sme.sk/articles/view/49886/8/amphibians_on_the_move.html
Ophidiophobia: Cause and Cure
Snake. The very sound
of the word has a negative connotation in our culture. If we think somebody borders on evil, we call
them a snake. If they are a liar, we say
they have a forked tongue. Most modern
Christians associate snakes with the devil (even though early Christians saw
snakes as representative of Christ and redemption. See John 3:14-16 and Numbers 21:8.) The fear and hatred of snakes among Western
people at large is so strong and pervasive that most people will either run at
the first sign of a snake, or turn and kill it.
Over all, the prejudice of the 21st century West against this
animal reaches a fever on par with 14th century superstitions. What
causes this ailment? What is the
cure? That is what I would like to get
us thinking about in this article.
Even non-venomous snakes, such as this indigo snake, strike fear into the hearts of the public.
To understand how to improve public perceptions of snakes,
we have to understand what causes those perceptions. First, let’s consider what is not the
cause of this fear and hate. Attempting
to explain it by the fact that many snakes are in fact dangerously venomous is
not sufficient. For many people, their
perception of snakes goes beyond honest fear of harm to actual hatred. And it makes little difference to most people
if the snake they are confronted with is confirmed as harmless. The fear continues.
Hollywood doesn't help....
Further, though we may be tempted to point the finger at Hollywood,
that is not where the blame belongs. Sensationalized
use of snakes on the big screen certainly doesn’t help, but let’s not kid
ourselves: Hollywood
can use snakes as a cheap tool for sensation because of the perceptions that
the audience comes with beforehand. Hollywood’s
use of snakes doesn’t cause the perception, it exploits it (but certainly also
intensifies it).
Religion is not the cause of fear of snakes in our culture.
Lastly, attitudes about snakes are not caused by
religion. Yes, the famous snake from the
Garden of Eden extends and deepens the fear for some people, but I would once
again argue this is not the source. In
my experience, people of all beliefs tend to have similar views of snakes. It could be held that, independent of an
individual’s present belief system, Judeo-Christian attitudes pervade our
Western culture, including attitudes on snakes.
But looking abroad quickly dispels this notion: it is easy to find a similar picture of
snakes in many cultures with no such heritage.
The legless, serpentine body form is just very, very strange to us.
Venom, Hollywood,
and religion impact our view of snakes, but the basic fear we hold for them is
independent of all of these. So where
does this fear come from? My experience
observing countless people react to snakes points to the intrinsic characteristics
of the snakes themselves as the culprit.
Snakes are the only limbless animal of any appreciable size commonly
encountered by humans. Think about
that. There is no other animal bigger
than a worm that is part of our lives that does not have legs. Other legless squamates and caecilians are
indistinguishable from a snake to the average person, and are almost never
encountered by the average person anyway.
Eels are marine, a world away. To most people, snakes are simply the only living thing without legs
(besides worms and snails).
This has huge implications. A long, flexible body form without definition is extremely alien to us. But what really freaks us out is how such an animal moves. I find that the slithering, inching belly crawl of heavy-bodied snakes and the effortless, sleek motion of slender snakes are both terrifying to people. Add to that the already foreign characteristics of reptiles, including shiny scales (equals slimy in most people’s minds) covering the entire body, ectothermy, unblinking, spectacled eyes, and a flicking, chemosensory tongue, and you have a recipe adding up to the complete estrangement of an animal. We fear what we don’t understand, and we have virtually no intuitive understanding of snakes. As tetrapods, we have a certain intrinsic understanding of all other legged creatures. This one creature that creeps into our lives devoid of legs is in a completely different category for us.
This has huge implications. A long, flexible body form without definition is extremely alien to us. But what really freaks us out is how such an animal moves. I find that the slithering, inching belly crawl of heavy-bodied snakes and the effortless, sleek motion of slender snakes are both terrifying to people. Add to that the already foreign characteristics of reptiles, including shiny scales (equals slimy in most people’s minds) covering the entire body, ectothermy, unblinking, spectacled eyes, and a flicking, chemosensory tongue, and you have a recipe adding up to the complete estrangement of an animal. We fear what we don’t understand, and we have virtually no intuitive understanding of snakes. As tetrapods, we have a certain intrinsic understanding of all other legged creatures. This one creature that creeps into our lives devoid of legs is in a completely different category for us.
This may all seem quite obvious and unprofound, but understanding
this is essential to understanding the solution. The solution to the fear and hatred caused by
the estrangement between human and snake is anything that relates the two
together positively. It’s not enough
that people be merely exposed to snakes, as in nature documentaries or zoos,
though this helps. It’s extremely
important that people actually see a snake and human relating positively to one
another. Even more important, people
need to relate directly with snakes themselves.
This is common knowledge among wildlife educators. But just why it is important, and how
paramount is that importance, is not always grasped. Failure to understand why results in
ineffectual attempts to change public attitudes. For instance, many educators will expend
great effort explaining the ecological importance of snakes, and the subsequent
services to humans they provide. Others
will concentrate on how harmless the huge majority of snakes are, and that
dangerous snakes don’t seek harm to humans purposefully. This knowledge is important for establishing
the value of snakes and dispelling overblown fear of venomous snakes. But it doesn’t address the basic fear of
snakes as creatures without legs. In other words, appealing to people's intellect doesn't resolve the fear because the fear is not primarily intellectual. It's emotional, and has to be appealed to at that level.
The best way to do that is to bring people face to face with
a snake, especially at a young, impressionable age. Even a brief encounter can accustom someone
to the unique body shape and movements of snakes, and they often leave with a
new appreciation of snakes as living individuals. For those bold enough, nothing compares to
touching or holding these animals for establishing a connection with a creature
otherwise entirely foreign to our sensibilities. Zoos are more frequently bringing snakes
beyond the glass to visitors, with excellent results. Private keeping of snakes, though not without
its drawbacks at times, has also had a great impact: conscientious snake keepers expose many
people within their sphere of influence to personal encounters with
snakes. I see the success of Steve
Irwin, otherwise known as the Crocodile Hunter on Animal Planet, as stemming
from this phenomenon as well. Viewers
vicariously experienced personal encounters with snakes through his unusually
hands-on show, and I still meet people who don’t fear snakes because of his
influence.
Personally interacting with snakes was perhaps the biggest influence Steve Irwin had over his audience's perception of the animal.
All this is part of the bigger picture of establishing
humans in a place amongst nature, not set apart from it. The chasm between snakes and humans
epitomizes that dichotomy, and re-integrating the two is a small step toward an
holistic view of all life. Ultimately,
people only save things that they love, and only love what they
understand. We need to recognize the
importance of visceral understanding, not just intellectual understanding. To regain a connection with nature in our
culture, nature must spread from our heads to our hearts. Real life experience with nature does that
like nothing else. Go start with one
small step and introduce someone to a serpent.
Tuesday, April 30, 2013
Ground Skink
Ground Skink
Scincella lateralis
Although this picture is a little blurry, you can tell that this is a skink. This ground skink was a smooth, blackish-brown lizard with a white belly. This “elfish lizard" was found running in snakelike movements across the hill country horizon in Kerrville, TX in the middle of February 2013. It was a relatively cool day with constant cloud cover overhead. This skink mostly stayed still with its eyes closed the entire time it was being held. According to the Peterson Field Guide of Reptiles and Amphibians: Eastern/Central North America by Roger Conant and Joseph T. Collins, this species of skink can grow to be 3-5.5 in (7.5-14.6 cm) in length. This reptile was released under a fallen tree trunk close to where it was found running.
Flathead Snake
Flathead Snake
Tantilla gracilis
Rio Grande Leopard Frog
Rio Grande Leopard Frog/Tadpole
Rana berlandieri
Texas Spiny Lizard
Texas Spiny Lizard
Sceloporus olivaceus
This Lizard was found scurrying from a patch of prickly pear
cactus to underneath a fallen tree trunk in a relatively untouched hill country
habitat in Kerrville, TX in early February of this year (2013). My brave professor blindly stuck
his hand underneath this tree trunk to carefully pull this species out to show
it to our class. This "rusty" lizard was a characterized as a male for it had the distinguishing
narrow light blue areas on the sides of its belly. This species can grow to 7.5-11 in (19-27.9 cm) in length. After classifying this animal from the Peterson Field Guide of Reptiles and Amphibians: Eastern/Central North America by Roger Conant and Joseph T. Collins, we let him go underneath the tree trunk my professor originally pulled him from.
Herps in the news: Frogs, Foam and Fuel
Are Anurans the answer to the energy crisis?
Not exactly, but according to researchers at University of Cincinnati they've inspired a solution. Motivated by the nesting foam produced by the Tungara Frog, Engystomops pustulosus, scientists have developed a foam capable of abstracting solar energy and capturing carbon dioxide from exhaust systems. The artificial, photosynthetic foam requires no soil and comprises of plant material, bacteria, frog and fungal enzymes. The inexpensive foam shows huge potential considering billions are spent globally to find an answer to dwindling fossil fuels. Economical and efficient, this could potentially be the breakthrough that saves the future of society.
Natural History: Ground Skink (Scincella lateralis)
The ground skink (Scincella lateralis) is a small, extremely quick and agile member of the skink family (Family Scincidae). I caught a ground skink in some leaf litter along side a shallow swampy area at Donnelley Wildlife Management Area with some difficulty. I wasn't sure if I had caught it or not and it took me several attempts to grab it- a testament to just how elusive they are. This skink is very adept at blending in with the leaf liter, sticks, etc. and evading potential predators. I only saw the one I caught because it dashed off and I caught sight of its movement. After its hard fought escape attempt it remained relatively calm as it caught its breath (like other reptiles, they cannot breath while they are running away).
The ground skink is also known as the "brown-backed skink" or the "brown bark skink". They have long tails and may look like a tiny snake moving through leafs and debris on the ground. They normally do not climb, which surprised me. When I put the individual pictured above into the plastic container I was a little surprised that it was not able to climb out. However, the ground skink "may enter shallow water in an attempt to escape".
Their coloration is variable but is usually "golden brown to blackish brown...with a dark dorsolateral stripe" according the the field guide. Their stomachs are usually a lighter color. Another interesting feature of the ground skink is that they have a special adaptation which allows them to see when they close their eyes. A see-through lower eyelid could be very useful to protect their eyes from debris on the ground or water. Also, the ground skink is known to undergo tail autotomy when threatened. Their diet consists of small insects and spiders.
The ground skink mates between January and August and lays up to 5 clutches of 1-7 eggs during the spring and summer months, which take about 1-2 months to hatch. They do not have any parental care as females abandon their eggs after deposition. The young take about a year to mature.
This species is one of my favorites because of its unique coloration that has a distinct golden glimmer in the sunshine. If only they were a little less elusive and a little easier to catch!
Works Cited:
Conant, Roger, and Joseph T. Collins. A Field Guide to Reptiles & Amphibians : Eastern and Central North America. Boston: Houghton Mifflin, 1998. Print.
Shapiro, Leo. "Scincella Lateralis." Encyclopedia of Life. N.p., n.d. Web. 30 Apr. 2013.
The ground skink is also known as the "brown-backed skink" or the "brown bark skink". They have long tails and may look like a tiny snake moving through leafs and debris on the ground. They normally do not climb, which surprised me. When I put the individual pictured above into the plastic container I was a little surprised that it was not able to climb out. However, the ground skink "may enter shallow water in an attempt to escape".
Their coloration is variable but is usually "golden brown to blackish brown...with a dark dorsolateral stripe" according the the field guide. Their stomachs are usually a lighter color. Another interesting feature of the ground skink is that they have a special adaptation which allows them to see when they close their eyes. A see-through lower eyelid could be very useful to protect their eyes from debris on the ground or water. Also, the ground skink is known to undergo tail autotomy when threatened. Their diet consists of small insects and spiders.
The ground skink mates between January and August and lays up to 5 clutches of 1-7 eggs during the spring and summer months, which take about 1-2 months to hatch. They do not have any parental care as females abandon their eggs after deposition. The young take about a year to mature.
This species is one of my favorites because of its unique coloration that has a distinct golden glimmer in the sunshine. If only they were a little less elusive and a little easier to catch!
Works Cited:
Conant, Roger, and Joseph T. Collins. A Field Guide to Reptiles & Amphibians : Eastern and Central North America. Boston: Houghton Mifflin, 1998. Print.
Shapiro, Leo. "Scincella Lateralis." Encyclopedia of Life. N.p., n.d. Web. 30 Apr. 2013.
Review: Do frog-eating bats perceptually bind the complex components of frog calls?
"DO MY TONSILS LOOK SWOLLEN?" |
Figure 1. Variation of calls used. Dashed line separates calls played simultaneously. C = Chuck. W = Whine. |
Researchers collected 10 bats from Panama for the experiment. Using 3 separate speakers, 300 different call variations from 50 Túngara frogs were played to decipher which calls bats would attract bats. A variation of single "whine" and "chucks" were tested in addition to complex calls consisting of both. In addition to separating the calls, scientists reversed the natural order of the calls and verify which portion of the complex mating call was more effective in attracting mates and predators.
Figure 2. Mean bat responses to frog calls. Astericks represent significantly different data. |
Results conclude bats prefer "whines" significantly more than "chucks," but "chucks" alone suffice in attracting bats. In contrast, female frogs will not respond to "chucks" alone suggesting that bats are more flexible when processing mating calls than frogs.
The experimental design was well structured, organized and executed. The only issue is the calls were too clean. In the natural habitat a cacophony of mating calls can be heard and may influence bat's frog call selection in a different way. This experiment aimed at isolating individual calls, but not a realistic approach as no environment would actually mimic this design.
I read this article because I wanted to learn more about acoustic calling in frogs. In this case, while males are the active competitor for mating, they're also protecting females from acoustic predators. I wonder why females aren't attracted to single "chucks," but prefer calls that include them following a "whine." The entire process of male selection is a fascinating topic and by researching how other animals respond to their calls we can gain better understanding of anuran behavior.
Jones, Patricia L.. Do frog-eating bats perceptually bind the complex components of frog calls? J OF COMPAR PHYSIO A-NEURO SENS NEURAL AND BEHAV PHYSIO. Vol. 199 No. 4. 2013 p. 279 - 283.
Herps in Society
Snakes in Society
Being in this course really has opened my eyes to how easy it is for people to kill a snake in their backyard just because it's a snake. I even remember my Grandfather telling me as a young girl "A good snake is a dead snake."
Why is it people freak out over snakes? Doing a little internet research I came across a countdown of the top ten phobias from 2011 and slithering snakes was number 1. Even Beat out spiders, heights and being in the dark. I thought it was interesting this site thinks that being afraid of snakes is an evolutionary trait that we have carried since the beginning of time (Bryner, J. 2011). Generally, being able to spot a snake increases one's chance of survival. Therefore, our fear of snakes is really an evolved survival trait. This makes sense to me because well, if you know what can kill you, you will steer clear of it to live. That doesn't mean our society should be this afraid of snakes or kill one if it's in your way of a hike. I blame this in part to movies that show snakes as venomous creatures that will always kill you if you don't kill it first. This probably enhanced the snake terror among society. After all, terror sells.
The Anaconda's movies always freaked me out as a child. I mean, just look how horrifying the movie poster was. Doesn't help society cope with snakes.
Then there was Indiana Jones and his famous "I hate snakes" line. Or, "Snakes? Why did it have to be snakes?" It's a line easily quoted and imprinted in one's mind forever.
If you weren't scared of snakes and planes before, you are now.
It doesn't help people to get over their innate fear of snakes by pranking them like in this video:
http://www.youtube.com/watch?v=OqHtgNajFxs
Sure it's funny for our enjoyment but it doesn't help people get over their fear of snakes.What does? I've seen people get over their fear of snakes by seeing celebrities interact with them. Like, back when Britney Spears was in her prime. This actually taught a few of us girls it's ok to touch non venomous snakes because well, they're non venomous and beautiful creatures. And in Britney's case, a nice LIVING accessory. No need to kill these beautiful creatures for their patterned skins.
Notice she's holding the constrictor at angle where it can't wrap around her neck. Above all, one needs to be careful when handling any snake ever.
And who could forget our favorite Aussie Steve Irwin? He was amazing at showing people around the world it's ok to be afraid of snakes and would show us which ones to not be afraid of. However, he always had to add a disclaimer to not pick up the poisonous snakes and play with them like he did. Advice well taken Mr. Irwin.
So what it all comes down to is simply being educated about these creatures; which was the life goal of Steve Irwin. We spent a good bit of this semester learning how to identify our local venomous snakes and its mimics as well as the harmless snakes. Now I can go home and convince my family over the summer that not all good snakes have to be dead ones in their minds. Yes, there are some to steer clear of but for the most part people do not need to be afraid of them. Hollywood likes to make snakes the bad guys but they're really good guys, for the most part. Just keep an eye out for them especially since it's warming up!
Work Cited:
Bryner, J. What Really Scares People: Top 10 Phobias | Fear of Snakes, Fear of Heights, Fear of Flying | LiveScience . Science News – Science Articles and Current Events | LiveScience. Retrieved April 29, 2013, from http://www.livescience.com/13434-phobias-fears-acrophobia-heights-agoraphobia-arachnophobia.html
Being in this course really has opened my eyes to how easy it is for people to kill a snake in their backyard just because it's a snake. I even remember my Grandfather telling me as a young girl "A good snake is a dead snake."
Why is it people freak out over snakes? Doing a little internet research I came across a countdown of the top ten phobias from 2011 and slithering snakes was number 1. Even Beat out spiders, heights and being in the dark. I thought it was interesting this site thinks that being afraid of snakes is an evolutionary trait that we have carried since the beginning of time (Bryner, J. 2011). Generally, being able to spot a snake increases one's chance of survival. Therefore, our fear of snakes is really an evolved survival trait. This makes sense to me because well, if you know what can kill you, you will steer clear of it to live. That doesn't mean our society should be this afraid of snakes or kill one if it's in your way of a hike. I blame this in part to movies that show snakes as venomous creatures that will always kill you if you don't kill it first. This probably enhanced the snake terror among society. After all, terror sells.
The Anaconda's movies always freaked me out as a child. I mean, just look how horrifying the movie poster was. Doesn't help society cope with snakes.
Then there was Indiana Jones and his famous "I hate snakes" line. Or, "Snakes? Why did it have to be snakes?" It's a line easily quoted and imprinted in one's mind forever.
Worse is the use of venomous snakes to assassinate someone. This has been used in a lot of movies and T.V. shows. Take Snakes on a Plane for instance.
It doesn't help people to get over their innate fear of snakes by pranking them like in this video:
http://www.youtube.com/watch?v=OqHtgNajFxs
Sure it's funny for our enjoyment but it doesn't help people get over their fear of snakes.What does? I've seen people get over their fear of snakes by seeing celebrities interact with them. Like, back when Britney Spears was in her prime. This actually taught a few of us girls it's ok to touch non venomous snakes because well, they're non venomous and beautiful creatures. And in Britney's case, a nice LIVING accessory. No need to kill these beautiful creatures for their patterned skins.
Notice she's holding the constrictor at angle where it can't wrap around her neck. Above all, one needs to be careful when handling any snake ever.
And who could forget our favorite Aussie Steve Irwin? He was amazing at showing people around the world it's ok to be afraid of snakes and would show us which ones to not be afraid of. However, he always had to add a disclaimer to not pick up the poisonous snakes and play with them like he did. Advice well taken Mr. Irwin.
So what it all comes down to is simply being educated about these creatures; which was the life goal of Steve Irwin. We spent a good bit of this semester learning how to identify our local venomous snakes and its mimics as well as the harmless snakes. Now I can go home and convince my family over the summer that not all good snakes have to be dead ones in their minds. Yes, there are some to steer clear of but for the most part people do not need to be afraid of them. Hollywood likes to make snakes the bad guys but they're really good guys, for the most part. Just keep an eye out for them especially since it's warming up!
Work Cited:
Bryner, J. What Really Scares People: Top 10 Phobias | Fear of Snakes, Fear of Heights, Fear of Flying | LiveScience . Science News – Science Articles and Current Events | LiveScience. Retrieved April 29, 2013, from http://www.livescience.com/13434-phobias-fears-acrophobia-heights-agoraphobia-arachnophobia.html
Therapeutic potential of snake venom in cancer therapy: current
perspectives
Asian Pacific Journal of Tropical Biomedicine
By: Vivek Kumar Vyas, Keyur Brahmbhatt, Hardik Bhatt, Utsav Parmar
There have been many documented studies suggesting the anti-cancer properties of snake venom. Specifically, some proteins and/or peptides and enzymes from snake venom have been discovered to affect the proliferation of cancerous cells by binding to their membranes. Snake venoms contain an assortment of these proteins, peptides, enzymes, as well as organic and inorganic compound. The evidence behind the therapeutic potential of snake venom in cancer therapy are the findings of the studies mentioned in this article. Many studies found complete remission of tumor cells after they had been treated with molecules made from the snake venom. The various ways in which snake venom inhibits cell proliferation and promotes cell death are through the induction of apoptosis of cancerous cells, increasing the calcium influx, inducing cytochrome C release, and by decreasing or increasing the expression of proteins that control the cell cycle.
This article adds to our understanding of snakes by better understanding the components of snake venom and their medical implications. This article is specifically important due to its significant implications. Cancer is a very deadly disease which impacts many people's lives. It is caused by uncontrolled cell growth. If snake venom is the key to slowing the disease, then it could be very beneficial.
Link: http://www.sciencedirect.com.nuncio.cofc.edu/science/article/pii/S2221169113600428?np=y
Article Review: Rana ridibunda skin secretions accelerate wound healing
Article Review: Topical effects of frog "Rana ridibunda" skin secretions on wound healing and the reduction of wound microbial load
In traditional medical applications frog skin has been used as wound dressing for its effectiveness in speeding healing and its ability to reduce inflammation with its secretions. This article represents an investigation of these properties as it examines the effectiveness of frog skin secretion when applied to wounds on mice. The application of raw extractions (RE) of the secretions is compared with extractions of a different membrane size cutoff (U10E) as well as a control and a group with a different ointment (o). The wound closure and microbiology are observed and compared among these groups over a period of 6 days. The numbers of inflammatory and fibroblast cells and the amount of collagen fibers were some of the histological parameters observed and compared among the different test groups. The results show that the group with the membrane size controlled cutoff demonstrated the greatest degree of wound healing. The result tables for both wound closure and wound microbiology are shown below.
The potential value of this is that it may eventually lead to the production of new materials, drugs, treatments, or perhaps just better understanding of the mechanisms of growth and repair systems of biological structures such as skin or tissues.
This article was interesting to me because it focused on the effect of skin secretions on wound healing, tying in directly to one of my current courses. This semester in a physics course I learned about nano-scale self-assembly liquid crystal (LC) films from defibrillated chitosan nanofibers and how this biomemetic process may open up possibilities for research in accelerated wound healing (biological tissues are known to self-assemble in a similar fashion and principal proteins such as collagen, chitin, or keratin are primary constituents of soft tissue).
I was interested in the fact that there was significant correlation between wound healing and the increased amount of fibroblast cells (and the sequential higher amount of collagen). I am curious as to which biomediated mechanism determines the structure and how it functions in wound healing, as well as ways this information may be valuable for a similar experiment reproduced with biomemetic materials.
Mohammad Mashreghi, Mahere Rezazade Bazaz, Nasser Mahdavi Shahri, Ahmad Asoodeh, Mansour Mashreghi, Morteza Behnam Rassouli, Shiva Golmohammadzadeh,
Topical effects of frog “Rana ridibunda” skin secretions on wound healing and reduction of wound microbial load,
Journal of Ethnopharmacology, Volume 145, Issue 3, 13 February 2013,
Pages 793-797, ISSN 0378-8741, 10.1016/j.jep.2012.12.016.
(http://www.sciencedirect.com/science/article/pii/S0378874112008501)
Herps
in the News
'Flipperbot' Crawls Like a Turtle to
Save Them
Eric Niiler
A team of engineers
from Georgia Tech and Northwestern University created a “flipper bot.” It’s an artificial
sea turtle designed to study how a baby sea turtles move across the beach after
hatching. They plan to use this to better study the physics of sea turtle
locomotion and to protect them and their beaches. Many beaches undergo nourishment
programs where they replace the sand lost from erosion. And if you get the
wrong sand it could slow down how fast the sea turtles can get to sea. This is
very important because there is a high predation rate at that short time
period.
In their studies they
noticed that not all sea turtles are good at running across the beach. Some
were but others seemed to dig themselves in a hole trying to get across. The
key seemed to be how they bent their wrists, but they had no evidence. So they
made “flipper bot” to test the bends of their wrist and locomotion across sand.
But since sand has some moisture problems, they used poppy seeds instead which
has similar characteristics as sand but without the problem. “Flipper bot” has
allowed them to study the locomotion of baby sea turtles repeatedly over long
periods of time.
Back From the Dead?
Brian Howard and Christine Dell'Amore
On a side not I came
across an interesting article that is a bit older, that came out last month.
They are trying to resurrect the gastric-brooding frog. These frogs have been
extinct since the mid-1980s due to habitat degradation, pollution, and disease.
What is so unique about these frogs is that the female swallows her own
fertilized eggs. Her stomach then stops producing acid and becomes a make-shift
womb. But scientists are now trying to resurrect this extinct species through
cloning. They had a few preserved specimens in Australian museums, and with
that they managed to make embryos but have not been able to get any further.
They believe this is due to how they are handling the eggs but work is still
being done.
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