Archive for December, 2011

80-Pound, Cold-Stunned Loggerhead Sea Turtle

Friday, December 30th, 2011

duo 001 480

80-Pound, Cold-Stunned Juvenile Loggerhead

A crisp December 29th arrived with fresh westerly winds driving breakers onto the bayside shore of  Cape Cod.  Wind direction suggested any cold-stunned sea turtles that might remain in Cape Cod Bay would wash up on the high tide wrack line of west facing beaches from Orleans to Truro.  The Turtle Journal team decided to patrol the sandy bayside shore from Great Island in Wellfleet to Fisher Beach in south Truro.  As Sue Wieber Nourse walked the stretch from Duck Harbor to Ryder Beach, she discovered a very large cold-stunned loggerhead sea turtle (Caretta caretta) that had been deposited during the early morning high tide.

duo 002 480

Sue Wieber Nourse, Rufus and Loggerhead

Easily identified by its massive neck and head that helped name this turtle after the enormous logger cleats of whaling boats, this juvenile loggerhead weighed in the range of 80 to 95 pounds.  Sue and Rufus sit beside the cold-stunned sea turtle to give a sense of perspective of its size, as we waited for a sled to drag her off the beach.

duo 003 480

Epibiotic Community on Loggerhead Carapace

Loggerheads often arrive on Cape Cod with a dense epibiotic community of fauna and flora.  This one was no exception with large and small barnacles, as well as a dense layer of mussels.

duo 004 480

Cold-Stunned Juvenile Kemp’s Ridley

About 50 feet to the south, a small, roughly 5 pound Kemp’s ridley (Lepidochelys kempii) had washed up higher on the wrack line.  Less than a foot long and probably about 2 years old, this turtle had traveled from the Gulf of Mexico through the Gulf Stream in Sargasso mats to end up trapped in Cape Cod Bay by dropping fall temperatures. 

duo 005 480

Cold-Stunned ~ 2-Year-Old Kemp’s Ridley

Kemp’s ridleys, although arguably the most endangered of sea turtles, comprise the largest percentage of Cape Cod sea turtle strandings each fall, usually as high as 90%.  The second largest number of cold-stunned strandings has historically been loggerheads.  But during the last decade, green sea turtles (Chelonia mydas) have seesawed with loggerheads for the dubious honor.  We suspect this situation indicates loggerheads have been doing poorly and greens have been faring a little better of late.  Americans can take the blame for the tragedy of declining loggerhead numbers because most of the nesting beaches and supporting habitat for this species lies under U.S. control.