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Andrew Crowder

Andrew Crowder is a Biologist at the USGS Wetland and Aquatic Research Center. 

Science and Products

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Tracking Elusive Male Sea Turtles with Satellites

Through satellite telemetry, researchers have discovered patterns of migratory behavior of long-lived imperiled marine reptiles.

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Tracking Sea Turtles: New Data-Collection Techniques Provide Fine-Scale Data

There is a growing need by marine scientists and managers for acquiring direct evidence of how various environmental conditions affect the behavior of...

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Space use and relative habitat selection for immature green turtles within a Caribbean marine protected area

Background A better understanding of sea turtle spatial ecology is critical for the continued conservation of imperiled sea turtles and their habitats. For resource managers to develop the most effective conservation strategies, it is especially important to examine how turtles use and select for habitats within their developmental foraging grounds. Here, we examine the space use and relative habi
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Ecosystems Mission Area, Wetland and Aquatic Research Center

Acoustic tag retention rate varies between juvenile green and hawksbill sea turtles

Background Biotelemetry has become a key tool for studying marine animals in the last decade, and a wide range of electronic tags are now available for answering a range of research questions. However, comparatively, less attention has been given to attachment methods for these tags and the implications of tag retention on study design, especially when designing a comparative study looking at mult
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Ecosystems Mission Area, Wetland and Aquatic Research Center

Ecological regime shift drives declining growth rates of sea turtles throughout the West Atlantic

Somatic growth is an integrated, individual-based response to environmental conditions, especially in ectotherms. Growth dynamics of large, mobile animals are particularly useful as bio-indicators of environmental change at regional scales. We assembled growth rate data from throughout the West Atlantic for green turtles, Chelonia mydas, which are long-lived, highly migratory, primarily herbivorou
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Ecosystems Mission Area, Wetland and Aquatic Research Center
Scientists releasing a green seat turtle from a boat
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Image: Green Sea Turtle Swimming in Dry Tortugas National Park
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