Tuesday, October 11, 2011

2011 New Jersey Society for the Conservation of Diamondback Terrapins


This year, the NJ Society for the Conservation of Diamondback Terrapins recognized Mrs. Dottie Reynolds for her outstanding contribution to the protection of terrapins on Long Beach Island. Dottie lives in an area with a high terrapin nest density, and she assists with females crossing the roadway, keeping them and their future hatchlings out of harms way. Dottie has worked on the LBI terrapin project for the past two years, and is a tremendous supporter of terrapin conservation. When you think about terrapin conservation, you definitely mention Dottie Reynolds in that conversation, every time. Congratulations Dottie and thanks for being so dedicated.

Friday, July 22, 2011

Terrapins in the Shark River? Still unknown



There has been some discussion over the possibility of diamondback terrapins living in the Shark River. Shark River is located in Monmouth County, NJ; it is a relatively small and shallow estuarine basin with no data to support the presence of terrapins. This summer (July 2011), the Marine Academy of Technology & Environmental Science (MATES), Drexel University, and interns with Monmouth University's Urban Coast Institute will pilot a mark and recapture study to hopefully answer this question. We will be working the weeks of July 4, July 18, and July 25 to capture diamondback terrapins.

The first week of trapping was on the south branch of the Shark River basin. The tidal range is great with traps sitting well, then beached during low tide. We caught a large snapping turtle (pictured) close to Brighton Road on July 7. We will resume trapping on July 18 in the north where there is more promising terrapin habitat than in the southern branch.

The second trapping session produced no terrapins during week one (July 17), but we are now concentrating efforts in Shark River Hills off S. Riverside and East End Avenues. After a second full week of trapping, we failed to capture any terrapins in Musquash Cove. Here is what we can report for this project:
1. Not a single terrapin was spotted basking anywhere along the banks of the masrhes
2. Not a single sign of nesting or even predation on nests was observed
3. Not a single terrapin was spotted in the water (which is not the case at Island Beach where we see them frequently)
4. Although trappins produced a snapping turtle, no terrapins were captured using baited hoop traps (in 360 hours of trapping). Compared to Island Beach with 30 terrapins caught in 360 hours).

Therefore, we cannot say "terrapins are not in the Shark River:, however, if terrapins are present, it would be a small population to say the least. Thanks to the Monmouth University students who were dedicated and did an outstanding job this summer!

Thursday, July 21, 2011

2011 LBI Nesting Update




Thanks to the many volunteers that attended our LBI Nest Watch 2011 Program on Sunday May 22. This is part of a nest relocation program scheduled for Long Beach Island at the Long Beach Island Foundation of the Arts and Sciences (LBIF). The Marine Academy of Technology and Environmental Science (MATES), Drexel University, and LBIF are conducting a project to identify nests, mark nests, and move nests that may be in areas with a high possibility of human disturbance. Nests that need to be relocated, will be moved to a hatchery at the LBIF in Loveladies, NJ. There will be an additional volunteer training session once terrapin nesting is underway! Thanks Marc and Jane for their work on June 2. Nicole M. moved a nest from a construction area to the LBIF on June 4. On June 6, Marc and Jane moves two nests and found one nest with 20 eggs in a clutch! This is the new high mark for Barnegat Bay. Today, June 9, another nest was moved to the Foundation. John is helping a female terrapin hit by a car on June 7 and rescued by Dave. Thanks Dave! Stay tuned for the predator project on High Bar Harbor with Kathy!

June 18 was a busy day, the High Bar Harbor Tax Payers Association heard from me and Kathy about the LBIF Project and the threat of raccoon predators. Marc and Jane have been doing a great job in relocating nests and working with Dottie in Barnegat Light. There are eleven nests in the hatcheries at LBIF as of June 18.
As of June 24, there are 15 nests at the LBIF hatchery. On June 24, we marked 8 females that nested at High Bar Harbor, Barnegat Light, and North Beach. Thanks to Jane and Marc for their tireless efforts in Barnegat Light, and look for Kathy's terrapin nest predator prevention project at High Bar Harbor.
Next on the schedule is our hatchling watch at the Foundation and recovery of emerged terrapins for release back to the wild. Contact John if you would like to survey the hatchery at the LBIF to check for emerged hatchlings. Nest #1 and Nest #5had hatchlings on August 9 and 10! Nest #14 produced hatchlings on Friday August 11 and Sarah called to report more on August 13. We've had over 64 hatchlings as per August 20, 2011. We excavated several nests on August 25, 2011 in preparation of Hurricane Irene. Of five nests, we were able to rescue 14 hatchlings. Nests #30 and #31 contained eggs that looked good. All other nests were assessed and hatchlings removed at the LBIF. We had a volunteer recognition ceremony on October 11 at the MATES school (see photo above) and we thanked our tremendous volunteers for their time and dedication to the conservation of terrapins!
Contact Dr. John Wnek for more information (projectterrapin@gmail.com).

Check out the LBI Foundation of the Arts and Sciences Science Website http://www.lbifscience.org/ProjectTerrapin.htm

Sunday, June 5, 2011

Terrapin Outreach and Education


Look for us at Ocan Fun Day on Saturday May 19, 2012 from 11 a.m. - 3 p.m.  and the 15th Annual Barnegat Bay Festival on Sunday June 3, 2012 at Island Heights, NJ

Bycatch reduction device (BRD) distribution (free) is with the purchase of new crab pots at Lacey Marine, Square Deal Hardware, L & H Woods and Water, and West Marine

Tuesday, May 31, 2011

The 2011 Barnegat Bay Nesting Season


On May 31, there were multiple reports of terrapins nesting at Barnegat Bay, New Jersey. Four marked adult female terrapins were captured on North Sedge Island and three of them dug nests. At Long Beach Island, two female terrapins nested. At LBI, we were not able to identify the nesting. The first days of June, we had ten female terrapins captured and six identified nests. On June 4, Nicole M. moved a nest from Cedar Bonnet Island to the LBIF hatchery and marked a female at LBIF! This week, June 5, Jane and Marc volunteered much time at Barnegat Light. They found a nest with a clutch size of 20 eggs!
At Sedge on June 10, it was the annual "terrapin arribada" with 23 females coming ashore. Five nests were moved and 17 females came up after 12 noon! It was a busy day. The previous night, it seems that the mink returned to the Island and destroyed all reference nests outside of the hatchery. Five known nests were predated. After Jules used her night vision camera, it was determined that a raccoon has inhabited the Island and is wreaking havoc on terrapin nests, and other wildlife on the Sedge. We will be humanely trapping the raccoon the week of June 20.
There has been no success trappin the raccoon this part week; however, nesting picked up on Sedge with 12 terrapins making landfall on June 23 and June 24. There are a total of 33 nests on the Island this year so far. On June 25, we had two terrapin nests on Sedge Island with 20 eggs each! This is new record. Terrapin AHPW produced 20 eggs on June 24. Terrapin AJKQW produced 20 eggs on June 25!
On July 3, the nesting season is coming to a close but we will still see some terrapins coming up from time to time for the next two weeks. Thanks to our fantasic volunteers.

On July 8, AHPW came back to dig her third nest of the season. She deposited 16 eggs! Way to go AHPW - one of originally marked terrapins from 2002! Next up will be our hatchling recovery program! On July 21, we assessed an early nest that has eggs that are incubating well. Our first nest produced emerged hatchlings at Sedge on August 10, 2011 with nests 1 and 2 producing hatchlings on consecutive days. We had two more nests with full incubation and emergence at Sedge. On August 20, nests 12 and 23 produced a total of 29 hatchlings out of a 29 eggs. On August 24, we completed a hatchery assessment with all nests in the 10's and 20's. Overall, we recovered over 70 hatchlings. Sadly, on August 31, we assessed the hatchery on N. Sedge Island and Hurricane Irene claimed the remaining nests. Washover from the storm knocked over the protection cages. It seems that some of the hatchlings were able to emerge; however, it seems that some predators were able to access the hatchery when the water was high (i.e., mink).

Wednesday, May 25, 2011

Horseshoe Crab Poaching

Although most of our research is focused on diamondback terrapins, we try to never lose sight of the fact that by helping the terrapins hopefully we are also conserving the other organisms in the bay. Horseshoe crabs just so happen to be one of my favorite creatures in Barnegat Bay (other than terrapins, of course!). We commonly catch horseshoe crabs in our fyke nets when we're trapping terrapins. We've also found horseshoe crab hatchlings on Conklin Beach which is one of our terrapin nesting sites. These crabs are commonly referred to as living fossils because they have changed very little in the past 250 million years. Horseshoe crab populations are dwindling due to the high numbers of crabs that are harvested for bait and fertilization. Luckily, in 2008, the state of New Jersey banned the harvest of horseshoe crabs. Unfortunately, some people still try to harvest horseshoe crabs even though there are regulations forbidding this practice. Three individuals were just caught in Ocean City, NJ on Monday poaching horseshoe crabs. Thank goodness someone called the police!

Thursday, May 5, 2011

Ouch! Even more terp injuries ...

Over the past five summers (2006 to 2010), we've captured over 2,000 terrapins in the Edwin B. Forsythe National Wildlife Refuge. Of those turtles, 17.4% have scars or open wounds from past or present injuries. Many of these injuries were caused by predators or by anthropogenic sources such as automobiles or boat propellers. I've always been interested in boat injuries considering that most of my research is based on the effects of recreational boat sounds on terrapin behavior. Of the injured terrapins we've captured in Forsythe, 18.9% of those injuries were attributed to boat propellers. It's pretty easy to tell if an injury was caused by boat strike because there is a slash mark in the terrapin's shell from the propeller. Typically, these injuries cause major damage in both the carapace (top shell) and plastron (bottom shell).

I apologize for the graphic photos, but this is yet another example of why the terrapins in Barnegat Bay need your help. Sign up for an expedition to help save the terps this summer!

Thursday, April 28, 2011

Abby's visual ecology research

Hello terrapin enthusiasts!

Wow, so much has happened this year, I don't even know where to start!

First of all, the Drexel terrapin crew went to Chauvin, LA in November to present our research findings at the diamondback terrapin working group symposium on the ecology, status, and conservation of the diamondback terrapin. We learned a great deal about other kinds of studies being conducted on the terrapin; most of all though, we learned how much we still don't know about the terrapin, and more research is necessary to gain a greater understanding.

Over the Summer of 2010 I collected over 500 reflectance spectra from more than 60 individual terrapins. From these data I have been able to compare coloration within and among individuals, as well as model the visual system of the terrapin. From these analyses and from previous research on turtle vision, I speculate that terrapins have tetrachormatic vision (UV, blue, green, red), and communicate across all color channels, especially in the UV. Intra- and inter-specific signaling in the UV has been documented in flower-pollinator relationships as well as a signal communicating fitness to potential mates (e.g. birds, jumping spiders, ocellated lizards).


In addition to the vision modeling, I have processed most of my blood and tissue samples. I hope to finish these up and send them out for genotyping so I can correlate possible differences in reproductive success with differences in phenotype (coloration). If UV patterning or coloration is a signal of fitness in the terrapin, then I may find that terrapins with a brighter UV signal may have higher reproductive success.


On top of all this, last March I completed my written candidacy exam, and on April 12 completed my oral exam to become a PhD candidate! Now that I am a candidate, the work has really started!

This Summer I hope to gather more reflectance spectra data, blood samples and hatchling tissue samples for genotyping, as well as design a system for measuring in situ underwater irradiance. But the only way this can be done is if you sign up to become an Earthwatch volunteer! Not only will you help me collect data to elucidate the visual ecology of the terrapin, you will get to join one of the research staff everyday to collect, track, and release terrapins. Some weeks we collect almost 100 terrapins! That's a lot of processing...so come sign up and help us out!

What are those orange things doing on the beach?

Well, they certainly do look weird - I can't really blame you for asking.
Believe it or not, they are actually being used for our terrapin research! This past summer I lined two historic nesting beaches in Barnegat with these orange construction barriers (a very kind donation from Yodock Inc.), as a form of modeled bulkheading. This is what bulkheading normally looks like in Barnegat Bay:
It's used to prevent properties' (such as this nice home on Long Beach Island) foundations from eroding away.
So, as a turtle, if this suddenly showed up on your nesting beach, what would you do?
That is my research question! And, it is a very important question to ask considering the incredibly high rate of human development occurring in Barnegat. I'm interested in seeing how much these bulkheads will displace nesting terrapins, and what behaviors they exhibit in relation to them.
Before putting the barriers in place this past summer, I wasn't sure if turtles would simply walk around the 'bulkheading' or drop their eggs in the water and run! In fact, I found that the terrapins exhibited a very high level of fidelity to the bulkheaded nesting beaches - simply walking around the barriers instead of switching sites.
Some turtles walked almost SIX TIMES further on land to nest on the bulkheaded beach. This could be a problem for these females in the long run b/c that means they are on beaches for longer periods of time, increasing their predation risk and energy allocation!
While they spend more time on land, females are spending an equal amount of time in the water "checking out" the beach before emerging to nest regardless of the barriers. This is interesting because I expected the turtles to spend more time looking at those big orange things before risking exposure to nest, wouldn't you?
How do I know where the turtles are on land and in the water?
Great question! This turtle shows off the telemetry equipment I use to track nesting turtles. The orange transmitter on the top of her shell sends transmissions through the air when she's on land, and the white transmitter on the back of her shell sends signals through the water. Then, I know not only if the turtle is on the beach nesting or outside the beach checking things out, but also exactly where she is on land or in the water.

I plan to replicate my 2010 experiment this coming summer, so if you are interested sign up for a Earthwatch team and come try your hand at turtle nesting surveys yourself! In the mean time, I'll keep you posted...

Monday, April 25, 2011

Homing Behavior and Homeward Orientation Study

Last summer, the Earthwatch volunteers helped me track terrapins to determine whether they display homing behavior, using radio and sonic telemetry. Eight out of the nine terrapins that we tracked all returned home successfully! Sadly, one was recaptured in a crab pot. We also placed terrapins inside a 16-square meter terrestrial arena to determine if they had homeward orientation (placing terrapins inside the arena at night was the most fun). We were able to run 181 terrapins in the arena throughout the summer and have some interesting results... females tend to have a mean homeward direction while males did not. Females may be interested in locating home for nesting locations. This summer, we are going to run more terrapins in the arena and need volunteers to help. If you are interested in seeing some more of my results, a poster I recently made for a symposium is here (click on the link, then go to the file menu of google docs to download the original full version of the poster).

-Nicole

Wednesday, April 20, 2011

Need summer plans? Join us to save the terps!

Well, it's that time of year again when we start planning for field season! Our first Earthwatch expedition starts on June 12, 2011 and there are a few volunteer spots still available. Check out the links to the right if you're interested in joining us!

For prosperity's sake, here's a snapshot of our staff from last summer. As far as I know, Dr. Avery, Dr. Standora, Dr. Wnek, Jules, Abby, Nicole, Brian, Chris, and I will still be around this summer and we'll be joined by a few new faces.

One of the most common questions that I'm asked is "what do you guys do all winter when you're not in the field"? Well, we certainly stay busy! As anyone who has done an expedition with us knows, we work from dawn to dusk trapping turtles and running experiments during the summer months. The winter months are incredibly important to us because they give us a chance to analyze our data from the summer, write papers, plan new experiments, teach biology/environmental science classes, give presentations on our research, etc., etc., etc. For example, earlier this month, Jules, Abby, and I presented our terrapin research at Drexel University's Research Day and College of Arts and Sciences' Research Day

Stay tuned to hear more about our research in the next few days!

Tuesday, April 19, 2011

Terrapin Hatchling Update


In 2010, we retrieved over 60 terrapin hatchlings from North Sedge Island as part of a head-start program. Since that time, six schools raised hatchlings including: Girard Middle School (PA); Lacey Middle School (NJ); Scotch Plains Elementary School (NJ); Southern Regional High School (NJ); Stafford Intermediate School (NJ) and Paterson Elementary School (NJ). We have released headstarted terrapins back to the Sedge Island Marine Conservation Zone throughout May 2011. Thanks to the students and their teachers for making this a tremendous learning experience!