Regression statistics of predatory reef-fish presence across a gradient of human population density.

aRegression coefficient and intercept values computed from untransformed data; test statistics computed from arcsine(?0.5) transformed data (Zar 1999).bSize data for sharks and jacks are from Caribbean reef shark (Carcharhinus perezii) and bar jack (Caranx ruber), respectively, which were the most common family representatives.CSignificant test after correction for multiple comparisons using sequential Bonferroni noted (*).Note: Barbados was removed from the regressions since its high HPD (642people/km2) was approximately 50% greater than the second highest nation (i.e., outlier), and therefore quantitatively exaggerated the effect of HPD; trends were qualitatively unaffected.