University of Hawai'i Press
Figure 4. Estimated size-specific growth rate function for green turtles in the CNMI, based on 64 turtles recaptured on Saipan and Rota from July 2007 to September 2014. (A) The solid curve is a cubic B-spline smooth fitted to the fitted GAM model values for annual growth rate (O), with the estimated 95% confidence band shaded; observed data (•) are shown for comparison. [GAM methods for growth rates as applied by ]. A graphical summary of the fitted GAM model is shown in B–D; the y-axis shows annual growth rate (response variable) on a centered smoothed function scale with 95% confidence bands. Covariates on the x-axis are (B) recapture interval in years, (C) calendar year of recapture, and (D) mean straight carapace length (SCL) between first capture and recapture. Deviance explained, 37.7%; generalized cross validation score, 1.75; R-squared (adjusted) = 0.325; intercept term = 3.11 (standard error = 0.16; significant); estimated degrees of freedom = 2.0, 1.9, and 1.0 for the smooth terms in B–D, respectively; the smooth terms in B and D were significant. From the fitted smooths in A, mean residency time for CNMI juvenile green turtles was estimated at 17 yr (13–24 yr, 95% confidence interval).
Figure 4.

Estimated size-specific growth rate function for green turtles in the CNMI, based on 64 turtles recaptured on Saipan and Rota from July 2007 to September 2014. (A) The solid curve is a cubic B-spline smooth fitted to the fitted GAM model values for annual growth rate (O), with the estimated 95% confidence band shaded; observed data (•) are shown for comparison. [GAM methods for growth rates as applied by Seminoff et al. (2002)]. A graphical summary of the fitted GAM model is shown in BD; the y-axis shows annual growth rate (response variable) on a centered smoothed function scale with 95% confidence bands. Covariates on the x-axis are (B) recapture interval in years, (C) calendar year of recapture, and (D) mean straight carapace length (SCL) between first capture and recapture. Deviance explained, 37.7%; generalized cross validation score, 1.75; R-squared (adjusted) = 0.325; intercept term = 3.11 (standard error = 0.16; significant); estimated degrees of freedom = 2.0, 1.9, and 1.0 for the smooth terms in BD, respectively; the smooth terms in B and D were significant. From the fitted smooths in A, mean residency time for CNMI juvenile green turtles was estimated at 17 yr (13–24 yr, 95% confidence interval).

Corresponding author (e-mail: tammymaesummers@yahoo.com)

Additional Information

ISSN
1534-6188
Print ISSN
0030-8870
Pages
269-286
Launched on MUSE
2017-07-12
Open Access
Yes
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