Archive for April, 2010

Marked Male Spotted Turtle Rediscovered Four Years Later in Mating Aggregation

Wednesday, April 7th, 2010

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Male Spotted Turtle #1 from Marion, MA 

Today dawned bright, beautiful and springtime warm.  Turtle Journal checked an abandoned cranberry bog in Marion on the South Coast of Massachusetts for spotted turtle mating activity.  Sure enough, four spotted turtles were basking on the bank of a shallow creek channel.  As they heard our approach, turtles quickly slipped into the water and hid under the dense vegetation.

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Carapace of Male Spotted Turtle #1

Twenty feet further along the creek, another basking spotted turtle tried the same escape trick, but without dense vegetative cover, he was easily netted.  A quick look at his carapace confirmed that this spotted turtle had been marked #1; that is, the first spotted turtle captured in this wetlands in April 2006 by Sue Wieber Nourse’s advanced marine science class under a major research and education grant from the National Fish and Wildlife Foundation.

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Plastron of Male Spotted Turtle #1

Spotted turtle #1 shows distinctive male characteristics: the long, thick tail with opening far beyond the shell and a concavity in the center posterior of the plastron.  Sexual dichromatism in spotted turtles is highlighted by this male’s drab colored neck as opposed to a female’s bright orange/yellow coloring.

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Concavity of Male Spotted Turtle #1

This image illustrates the plastron concavity of spotted turtle males, as well as the drabber neck coloration.

Male Spotted Turtle “Looking for Love”

After a complete physical examination and the collection of shell measurements and weight, spotted turtle #1 was released to rejoin his friends in this springtime mating aggregation.  Spotted #1 was 12 years old in 2006 and 16 years old today.  There were no significant differences in linear measurements of length and width of carapace (top shell) and plastron (bottom shell).  His weight in April 2006 was 160 grams and today he hit the scales at 174 grams.

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Comparison of Male Spotted Turtle #1, 2006 to 2010

One very troubling difference between #1’s appearance in 2006 and today is the loss of most of his right rear limb.  In 2006, we observed that this turtle had lost the claws on its right rear limb.  Today, as you can see from the plaston images above, a large part of its right rear limb is missing.  Still, upon release, as you can easily determine  from the video, his movement on land and swimming in the creek appeared unhampered by the injury.

Egg Hunt: Who Needs Bunnies When You Have Swans?

Sunday, April 4th, 2010

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Pair of Mute Swans (Cygnus olor) in Marion’s Spragues Cove

A pair of mute swans (Cygnus olor) have taken possession of the Spragues Cove pools and have built a nest on an artificial island separating the second and third pools.

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Mute Swan Leaves Nest on Artificial Island

As we explored the cove and its pools on Saturday, we spotted one of the swans taking a break from sitting on the nest. 

Mute Swan Nest in Spragues Cove 

We carefully investigated the nest while the swans foraged out of sight, careful not to contaminate the nest with human touch and scent. 

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Mute Swan Egg with Quarter for Sizing

Who needs an Easter bunny when you have a pair of swans to provide an oversized egg for the basket.  Unfortunately, we suspected the swans would not have accepted the egg back into the nest with chartreuse coloring.  So, we carefully disguised our presence before the pair returned to incubate the nest.  We watched closely to ensure that the swans accepted the egg and we returned again today, Sunday, to check again.  The pair continue to take turns incubating the egg.  Hopefully soon Turtle Journal will be able to document the newest member of the swan family for our readers.

Peep Show at Turtle Journal Traveling Lightwave Carnival

Saturday, April 3rd, 2010

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Mating Pair of Spring Peepers (Pseudacris crucifer) 

Step right up, ladies and gentlemen.  Push forward, kiddies; press your nose flat against the dazzling, fantasmagorical glass window.  Never before in the history of humankind has a virtual Peep Show offered such eye-popping, extra-ordinary sights and ear-splitting, explosive sounds right here in the Turtle Journal Traveling Lightwave Carnival, a Nature extravaganza so big it has tent flap, magic carpet openings built into every single digital computer and high speed handheld device on Planet Earth.

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Spring Peeper Pair from Outer Cape Cod Vernal Pool

Turtle Journal hiked a conservation trail in South Wellfleet Friday to search a series of vernal pools and swampy ponds where we have always found the very loudest and most cacophonous springtime serenades.  Even in bright sunshine, with temperatures dipping back into the 40s, only a few, isolated peepers screeched for amorous attention.  Luckily for us, Sue Wieber Nourse spotted a fast moving critter zigzagging through the mucky leaf matter at the bottom of a quickly evaporaping vernal pool.  Lo and behold, we discovered a mating pair of secretive spring peepers (Pseudacris crucifer).

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Spring Peeper Pair — Not Even a Handful

Truth to tell, and we always try to tell the truth unless it gets in the way of a good story; we didn’t notice the pairing until we examined it up close and personal.  This twosome had so closely embraced that they moved like one with the female providing all the locomotive power as illustrated in the following video clip.

Spring Peeper Mating Pair on Outer Cape Cod

Notice how tightly the two peepers are bound together and how powerfully the female springs forward with the male clinging to her back for dear life. 

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Female Spring Peeper

Spring Peepers are small “chorus” frogs whose mating calls we recognize each March as the beginning of spring serenade in wetlands across the Great White North.   They are brown colored with a darker “X” on their back (dorsal side) which yields the Latin species name crucifer (cross bearer).

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Spring Peepers in Conubial Bliss

Females are a bit larger than the males as illustrated in our pair pictured above.  Unsurprisingly, it is the male of the species that makes the loud, raucous mating calls that we recognize as the peeper chorus each spring.  “Won’t someone love me?” they screech at the top of their lungs.

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