Predicting multi-species foraging hotspots for marine turtles in the Gulf of Mexico

Endangered Species Research
By: , and 

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Abstract

Quantifying the distribution of animals and identifying underlying characteristics that define suitable habitat are essential for effective conservation of free-ranging species. Prioritizing areas for conservation is important in managing a geographic extent that has a high level of disturbance and limited conservation resources. We examined the potential use of a species distribution model ensemble for multi-species conservation in marine habitats. Using satellite telemetry locations during foraging as input data, and ensemble ecological niche models, we predicted foraging areas for 2 nesting marine turtle species within the Gulf of Mexico (GoM): Kemp’s ridley Lepidochelys kempii (n = 63) and loggerhead Caretta caretta (n = 63). We considered 7 geophysical, biological, and climatic variables and compared contributing factors for each species’ foraging habitat selection. For both species, predicted suitable foraging habitats encompassed large areas along the GoM coast, but only intersected with each other in relatively small areas. Highly parameterized models resulted in overall greater fits, suggesting that multiple factors influence habitat selection by these species. Model validation results were mixed: cross-validation resulted in high prediction accuracy for both species, but an evaluation against independent data resulted in a low omission rate (5%) for Kemp’s ridleys and a high omission rate (72%) for loggerheads. The relatively small intersection of model-predicted foraging areas for these 2 species within the study area may indicate possible niche differentiations. The high omission rate for loggerheads indicates our samples likely underrepresent the population and illustrates the challenges in predicting suitable foraging extents for species that make dynamic movements and have greater individual variability.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Predicting multi-species foraging hotspots for marine turtles in the Gulf of Mexico
Series title Endangered Species Research
DOI 10.3354/esr01059
Volume 43
Year Published 2020
Language English
Publisher Inter Research
Contributing office(s) Wetland and Aquatic Research Center
Description 14 p.
First page 253
Last page 266
Country United States, Mexico
Other Geospatial Gulf of Mexico
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