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Nest-site selection in individual loggerhead turtles and consequences for doomed-egg relocation.

Joseph B Pfaller1, Colin J Limpus, Karen A Bjorndal

  • 1Archie Carr Center for Sea Turtle Research and Department of Zoology, University of Florida, Gainesville, FL 32611, USA. jpfaller@bio.fsu.edu

Conservation Biology : the Journal of the Society for Conservation Biology
|September 19, 2008
PubMed
Summary
This summary is machine-generated.

Relocating loggerhead turtle (Caretta caretta) eggs from vulnerable sites is a vital conservation strategy. This study found that egg relocation does not significantly distort the gene pool, supporting its continued use for marine turtle conservation.

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Area of Science:

  • Marine Biology
  • Conservation Genetics
  • Reptile Ecology

Background:

  • Egg relocation is a common conservation tactic for endangered reptiles.
  • Concerns exist that relocating eggs might artificially select against traits for successful nest-site selection, especially if such traits are heritable.
  • Loggerhead turtles (Caretta caretta) are a vulnerable marine species requiring conservation efforts.

Purpose of the Study:

  • To assess whether relocating loggerhead turtle eggs imposes artificial selection on nest-site selection traits.
  • To evaluate the impact of egg relocation on the genetic diversity of loggerhead turtle populations.
  • To determine the efficacy of egg relocation as a conservation strategy for loggerhead turtles.

Main Methods:

  • Monitored loggerhead turtle nesting at Mon Repos beach, Queensland, Australia, during the 2005 season.
  • Measured distances of in situ (unrelocated) and relocated egg clutches from a stationary dune baseline.
  • Assessed nest fate by mapping tidal inundation and storm erosion lines to predict outcomes for relocated clutches.

Main Results:

  • Loggerhead turtles did not consistently select nest sites at specific distances from the dune baseline.
  • Unsuccessful nest-site selection was widespread across the nesting population; 80.3% of turtles chose at least one unsuccessful site.
  • Experienced females selected more successful nest sites than inexperienced ones, indicating a learning component in nest-site selection.

Conclusions:

  • Doomed-egg relocation saves a significant proportion of loggerhead turtle progeny from natural threats.
  • Artificial selection concerns are minimal because unsuccessful nest-site selection is not concentrated in a few individuals.
  • Egg relocation is a justifiable and effective conservation strategy for loggerhead turtles, preserving genetic diversity.