Somatic growth dynamics of West Atlantic hawksbill sea turtles: a spatio-temporal perspective

Bjorndal, Karen A., Chaloupka, Milani, Saba, Vincent S., Diez, Carlos E., van Dam, Robert P., Krueger, Barry H., Horrocks, Julia A., Santos, Armando J. B., Bellini, Claudio, Marcovaldi, Maria A. G., Nava, Mabel, Willis, Sue, Godley, Brendan J., Gore, Shannon, Hawkes, Lucy A., McGowan, Andrew, Witt, Matthew J., Stringell, Thomas B., Sanghera, Amdeep, Richardson, Peter B., Broderick, Annette C., Phillips, Quinton, Calosso, Marta C., Claydon, John A. B., Blumenthal, Janice, Moncada, Felix, Nodarse, Gonzalo, Medina, Yosvani, Dunbar, Stephen G., Wood, Lawrence D., Lagueux, Cynthia J., Campbell, Cathi L., Meylan, Anne B., Meylan, Peter A., Perez, Virginia R. Burns, Coleman, Robin A., Strindberg, Samantha, Guzman-H, Vicente, Hart, Kristen M., Cherkiss, Michael S., Hillis-Starr, Zandy, Lundgren, Ian F., Boulon Jr., Ralf H., Connett, Stephen, Outerbridge, Mark E. and Bolten, Alan B. (2016) Somatic growth dynamics of West Atlantic hawksbill sea turtles: a spatio-temporal perspective. Ecosphere, 7 5: 1-14. doi:10.1002/ecs2.1279

Author Bjorndal, Karen A.
Chaloupka, Milani
Saba, Vincent S.
Diez, Carlos E.
van Dam, Robert P.
Krueger, Barry H.
Horrocks, Julia A.
Santos, Armando J. B.
Bellini, Claudio
Marcovaldi, Maria A. G.
Nava, Mabel
Willis, Sue
Godley, Brendan J.
Gore, Shannon
Hawkes, Lucy A.
McGowan, Andrew
Witt, Matthew J.
Stringell, Thomas B.
Sanghera, Amdeep
Richardson, Peter B.
Broderick, Annette C.
Phillips, Quinton
Calosso, Marta C.
Claydon, John A. B.
Blumenthal, Janice
Moncada, Felix
Nodarse, Gonzalo
Medina, Yosvani
Dunbar, Stephen G.
Wood, Lawrence D.
Lagueux, Cynthia J.
Campbell, Cathi L.
Meylan, Anne B.
Meylan, Peter A.
Perez, Virginia R. Burns
Coleman, Robin A.
Strindberg, Samantha
Guzman-H, Vicente
Hart, Kristen M.
Cherkiss, Michael S.
Hillis-Starr, Zandy
Lundgren, Ian F.
Boulon Jr., Ralf H.
Connett, Stephen
Outerbridge, Mark E.
Bolten, Alan B.
Title Somatic growth dynamics of West Atlantic hawksbill sea turtles: a spatio-temporal perspective
Journal name Ecosphere   Check publisher's open access policy
ISSN 2150-8925
Publication date 2016-05-01
Year available 2016
Sub-type Article (original research)
DOI 10.1002/ecs2.1279
Open Access Status DOI
Volume 7
Issue 5
Start page 1
End page 14
Total pages 14
Place of publication Washington, DC United States
Publisher Ecological Society of America
Language eng
Formatted abstract
Somatic growth dynamics are an integrated response to environmental conditions. Hawksbill sea turtles (Eretmochelys imbricata) are long-lived, major consumers in coral reef habitats that move over broad geographic areas (hundreds to thousands of kilometers). We evaluated spatio-temporal effects on hawksbill growth dynamics over a 33-yr period and 24 study sites throughout the West Atlantic and explored relationships between growth dynamics and climate indices. We compiled the largest ever data set on somatic growth rates for hawksbills – 3541 growth increments from 1980 to 2013. Using generalized additive mixed model analyses, we evaluated 10 covariates, including spatial and temporal variation, that could affect growth rates. Growth rates throughout the region responded similarly over space and time. The lack of a spatial effect or spatio-temporal interaction and the very strong temporal effect reveal that growth rates in West Atlantic hawksbills are likely driven by region-wide forces. Between 1997 and 2013, mean growth rates declined significantly and steadily by 18%. Regional climate indices have significant relationships with annual growth rates with 0- or 1-yr lags: positive with the Multivariate El Niño Southern Oscillation Index (correlation = 0.99) and negative with Caribbean sea surface temperature (correlation = −0.85). Declines in growth rates between 1997 and 2013 throughout the West Atlantic most likely resulted from warming waters through indirect negative effects on foraging resources of hawksbills. These climatic influences are complex. With increasing temperatures, trajectories of decline of coral cover and availability in reef habitats of major prey species of hawksbills are not parallel. Knowledge of how choice of foraging habitats, prey selection, and prey abundance are affected by warming water temperatures is needed to understand how climate change will affect productivity of consumers that live in association with coral reefs.
Keyword Climate effects
Coral reefs
Eretmochelys imbricata
Greater Caribbean
Marine turtles
Multivariate ENSO index
Sea surface temperature
Somatic growth rates
West Atlantic
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
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