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).

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