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Retrospective analysis of bottlenose dolphin foraging: a legacy of anthropogenic ecosystem disturbance

Marine Mammal Science

By:
, , , , , ,
DOI: 10.1111/j.1748-7692.2012.00618.x

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Abstract

We used stable isotope analysis to investigate the foraging ecology of coastal bottlenose dolphins (Tursiops truncatus) in relation to a series of anthropogenic disturbances. We first demonstrated that stable isotopes are a faithful indicator of habitat use by comparing muscle isotope values to behavioral foraging data from the same individuals. δ13C values increased, while δ34S and δ15N values decreased with the percentage of feeding observations in seagrass habitat. We then utilized stable isotope values of muscle to assess temporal variation in foraging habitat from 1991 to 2010 and collagen from tooth crown tips to assess the time period 1944 to 2007. From 1991 to 2010, δ13C values of muscle decreased while δ34S values increased indicating reduced utilization of seagrass habitat. From 1944 to 1989 δ13C values of the crown tip declined significantly, likely due to a reduction in the coverage of seagrass habitat and δ15N values significantly increased, a trend we attribute to nutrient loading from a rapidly increasing human population. Our results demonstrate the utility of using marine mammal foraging habits to retrospectively assess the extent to which anthropogenic disturbance impacts coastal food webs.

Geospatial Extents

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Retrospective analysis of bottlenose dolphin foraging: a legacy of anthropogenic ecosystem disturbance
Series title:
Marine Mammal Science
DOI:
10.1111/j.1748-7692.2012.00618.x
Volume
29
Issue:
4
Year Published:
2013
Language:
English
Publisher:
Wiley
Contributing office(s):
Fort Collins Science Center
Description:
14 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
705
Last page:
718
Number of Pages:
14
Country:
United States
State:
Florida
Other Geospatial:
Sarasota Bay