Research ArticleMARINE CONSERVATION

Global sea turtle conservation successes

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Science Advances  20 Sep 2017:
Vol. 3, no. 9, e1600730
DOI: 10.1126/sciadv.1600730
  • Fig. 1 Trends in abundance at individual nesting sites.

    (A) The proportion of time series that showed significant upward or downward trends in the nesting abundance versus the length of the time series. We pooled individual time series in 4-year intervals, except for those >30 years, which we combined to ensure relatively even sample sizes within each class (sample sizes indicated by number next to each point). A model of a linear increase in the ability to detect a significant trend for time series up to 21 years followed by an invariant (0.62) ability to detect a trend explained 76% of the variance (F1,5 = 12.2, r2 = 0.76, P < 0.01). (B) For individual time series of annual nesting abundance that were ≥6 years long, the last year of the published time series. (C) The mean annual growth rate for individual time series versus the abundance at the start of the time series (using the mean nesting numbers for the first 3 years of monitoring). There was a weak (r2 = 0.15) but significant (P < 0.01) tendency for growth rate to be lower when the initial abundance in a time series was higher. However, across time series that differed hugely in levels of abundance, high growth rates were found.

  • Fig. 2 Trends in the nesting abundance of sea turtles integrated within RMUs.

    Plot symbols reflect species, colors reflect upward (green) or downward (red) trends, and symbol size represents mean growth rate. CC, C. caretta (loggerhead turtle); CM, C. mydas (green turtle); DC, D. coriacea (leatherback sea turtle); EI, E. imbricata (hawksbill turtle); LK, L. kempii (Kemp’s ridley); LO, L. olivacea (olive ridley); ND, N. depressus (flatback turtle).

Supplementary Materials

  • Supplementary material for this article is available at http://advances.sciencemag.org/cgi/content/full/3/9/e1600730/DC1

    table S1. The mean growth rate within individual RMUs, weighted to the nesting abundance at the end of the time series.

    table S2. Details of the 299 time series on the nesting abundance: Nonsignificant trends marked as 0, upward significant trends marked as 1, and downward trends marked as 2.

    table S3. List of sea turtle nesting sites and sources.

  • Supplementary Materials

    This PDF file includes:

    • table S1. The mean growth rate within individual RMUs, weighted to the nesting abundance at the end of the time series.
    • table S2. Details of the 299 time series on the nesting abundance: Nonsignificant trends marked as 0, upward significant trends marked as 1, and downward trends marked as 2.
    • table S3. List of sea turtle nesting sites and sources.

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