NDLI: Herbivory level and niche breadth of juvenile green turtles (Chelonia mydas) in a tropical coastal area: insights from stable isotopes

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Herbivory level and niche breadth of juvenile green turtles (Chelonia mydas) in a tropical coastal area: insights from stable isotopes

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Herbivory level and niche breadth of juvenile green turtles (Chelonia mydas) in a tropical coastal area: insights from stable isotopes

Content Provider	Springer Nature Link
Author	Di Beneditto, Ana Paula Madeira Sicilia, Salvatore Monteiro, Leandro Rabello
Copyright Year	2016
Abstract	In the present study, the herbivory level and the niche breadth of juvenile green turtles (Chelonia mydas) was investigated through stable isotope metrics in three geographically close foraging grounds (Búzios, Cabo Frio and Arraial do Cabo) located in a tropical coastal area at Rio de Janeiro State, southeastern Brazil (~23°S; 042°W). The green turtles sampled between 2009 and 2010 presented different δ15N values among the foraging grounds, with lower values in Cabo Frio; however, δ13C values were similar in green turtles from different areas. The green turtles recruited to neritic waters have a high herbivory level; despite an omnivorous behavior noted for individuals of the species from Búzios and Arraial do Cabo. Mixing model analysis highlighted Gracilaria sp., Sargassum vulgare and Gelidiella acerosa as the most assimilated food items. Niche breadth metrics presented lower values for green turtles from Cabo Frio, which is indicative of high fidelity to this foraging ground. The highest herbivory level was verified for turtles from Cabo Frio in comparison with Búzios and Arraial do Cabo, whose niche metrics show a more comprehensive use of the available food resources. In the study area, the niche breadth at a reduced spatial scale may reflect an intraspecific strategy to minimize competition, allowing more individuals to use the foraging ground for a longer period.
Starting Page	1
Ending Page	12
Page Count	12
File Format	PDF
ISSN	00253162
Journal	Marine Biology
Volume Number	164
Issue Number	1
e-ISSN	14321793
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-11-29
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Marine & Freshwater Sciences Freshwater & Marine Ecology Oceanography Microbiology Zoology
Content Type	Text
Resource Type	Article
Subject	Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics

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