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Marine Ecology Progress Series

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MEPS 419:289-294 (2010)  -  DOI:

Estimating carrying capacity at the green turtle nesting beach of East Island, French Frigate Shoals

Manjula Tiwari1,*, George H. Balazs2, Stacy Hargrove2

1Marine Turtle Ecology and Assessment Program, Protected Resources Division, Southwest Fisheries Science Center, NOAA-National Marine Fisheries Service, La Jolla, California 92037, USA
2Marine Turtle Research Program, Pacific Islands Fisheries Science Center, NOAA-National Marine Fisheries Service, Honolulu, Hawaii 96822, USA

ABSTRACT: Many sea turtle populations are at a fraction of their historical abundance, and understanding ecological processes, under current and climate change scenarios, is critical for establishing recovery goals. In the Hawaiian Islands, the nesting population of the green turtle Chelonia mydas on East Island, French Frigate Shoals, has been recovering at a rate of 5.7% per year. Climate change models, however, predict a loss in nesting habitat on East Island of up to 30% due to sea level rise by 2100. Therefore, the objective of the present study was to determine the carrying capacity of East Island for hatchlings and nesting females under current conditions and predictions of sea level rise. In the simulation model, density-dependent nest destruction was the primary factor regulating population size. Carrying capacity was reached between 1.9 and 2.1 million hatchlings at current conditions; carrying capacity was approached when 80000 to 120000 nests were laid on the beach, representing 20000 to 30000 nesting females. With a rise in sea level, carrying capacity was reached when 60000 to 100000 nests were laid on the beach. The current mean estimate of 390 nesting females per year, over the past 10 yr, at East Island represents 1.3 to 2% of the females that would nest at carrying capacity. The beach at East Island is well below carrying capacity and is capable of supporting a larger nesting population. However, the availability of suitable coastal habitats may play a bigger role in regulating the Hawaiian green turtle population than available nesting habitat.

KEY WORDS: Carrying capacity · Green turtles · Chelonia mydas · Nesting · Climate change · French Frigate Shoals · Hawaii

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Cite this article as: Tiwari M, Balazs GH, Hargrove S (2010) Estimating carrying capacity at the green turtle nesting beach of East Island, French Frigate Shoals. Mar Ecol Prog Ser 419:289-294.

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