Relative exposure index

An important factor in sea turtle nesting distribution

J. Santana Garcon, A. Grech, J. Moloney, M. Hamann*

*Corresponding author for this work

    Research output: Contribution to journalArticle

    28 Citations (Scopus)

    Abstract

    1. The threatened status of many sea turtle populations and their vulnerability to coastal development and predicted climate change emphasize the importance of understanding the role of environmental factors in their distribution and ecological processes. The factors driving the distribution of sea turtle nesting sites at a broad spatial scale is poorly understood. 2. In light of the lack of understanding about physical factors that drive the distribution of turtle nesting, the relationship between nesting site distribution and the exposure of coastal areas to wind and wind-generated waves was analysed. To achieve this, a Relative Exposure Index (REI) was developed for an extensive area in northeastern Australia and values of the index for nesting sites of five different sea turtle species and randomly selected non-nesting sites were compared. 3. Although there are differences between species, the results show that sea turtles nest in areas of higher REI values suggesting that wind exposure is related to the spatial distribution of sea turtle nesting sites, and it may also influence nest site selection in female turtles and/or the dispersal of hatchlings towards oceanic currents. 4. The combination of these results with further research on other driving environmental factors, like oceanic currents, has the potential to allow for the identification and prediction of future nesting sites, for which conservation and management may become essential.

    Original languageEnglish
    Pages (from-to)140-149
    Number of pages10
    JournalAquatic Conservation: Marine and Freshwater Ecosystems
    Volume20
    Issue number2
    DOIs
    Publication statusPublished - Mar 2010

    Keywords

    • Climate change
    • Coastal management
    • Frenzy behaviour
    • Geographic information system (GIS)
    • Hatchling dispersal
    • Marine turtle

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