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Life in the really slow lane : loggerhead sea turtles mature late relative to other reptiles

journal contribution
posted on 2012-02-01, 00:00 authored by R Scott, R Marsh, Graeme HaysGraeme Hays
1. Age at maturity is hard to estimate for species that cannot be directly marked or observed throughout their lives and yet is a key demographic parameter that is needed to assess the conservation status of endangered species. 2. For loggerhead turtles (Caretta caretta) in the North Atlantic and North Pacific, juvenile growth rates (c. 10 cm year−1) were calculated by examining size increases during transoceanic journeys; durations of which were estimated from satellite-tracked Lagrangian surface drifter buoy trajectories. 3. Lagrangian-derived growth estimates were used in a weighted loglinear model of size-specific growth rates for loggerhead turtles and combined with newly available information on size at maturity to estimate an age at maturity of 45 years (older than past estimates). 4. By examining the age at maturity for 79 reptile species, we show that loggerhead turtles, along with other large-bodied Testudine (turtle and tortoise) species, take longer to reach maturity than other reptile species of comparable sizes. This finding heightens concern over the future sustainability of turtle populations. By maturing at an old age, sea turtles will be less resilient to anthropogenic mortality than previously suspected.

History

Journal

Functional ecology

Volume

26

Issue

1

Pagination

227 - 235

Publisher

Wiley

Location

London, England

ISSN

0269-8463

eISSN

1365-2435

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2012, Wiley