Stable isotope and signature fatty acid analyses suggest reef manta rays feed on demersal zooplankton

Couturier, Lydie, I., Rohner, Christopher A., Richardson, Anthony J., Marshall , Andrea D., Jaine, Fabrice R. A., Bennett, Michael B., Townsend, Kathy A., Weeks, Scarla J. and Nichols, Peter D. (2013) Stable isotope and signature fatty acid analyses suggest reef manta rays feed on demersal zooplankton. PLoS One, 8 10: . doi:10.1371/journal.pone.0077152


Author Couturier, Lydie, I.
Rohner, Christopher A.
Richardson, Anthony J.
Marshall , Andrea D.
Jaine, Fabrice R. A.
Bennett, Michael B.
Townsend, Kathy A.
Weeks, Scarla J.
Nichols, Peter D.
Title Stable isotope and signature fatty acid analyses suggest reef manta rays feed on demersal zooplankton
Journal name PLoS One   Check publisher's open access policy
ISSN 1932-6203
Publication date 2013-10-22
Year available 2013
Sub-type Article (original research)
DOI 10.1371/journal.pone.0077152
Open Access Status DOI
Volume 8
Issue 10
Total pages 15
Place of publication San Francisco, United States
Publisher Public Library of Science
Collection year 2014
Language eng
Subject 1100 Agricultural and Biological Sciences
1300 Biochemistry, Genetics and Molecular Biology
2700 Medicine
Abstract Assessing the trophic role and interaction of an animal is key to understanding its general ecology and dynamics. Conventional techniques used to elucidate diet, such as stomach content analysis, are not suitable for large threatened marine species. Non-lethal sampling combined with biochemical methods provides a practical alternative for investigating the feeding ecology of these species. Stable isotope and signature fatty acid analyses of muscle tissue were used for the first time to examine assimilated diet of the reef manta ray Manta alfredi, and were compared with different zooplankton functional groups (i.e. near-surface zooplankton collected during manta ray feeding events and non-feeding periods, epipelagic zooplankton, demersal zooplankton and several different zooplankton taxa). Stable isotope δ15N values confirmed that the reef manta ray is a secondary consumer. This species had relatively high levels of docosahexaenoic acid (DHA) indicating a flagellate-based food source in the diet, which likely reflects feeding on DHA-rich near-surface and epipelagic zooplankton. However, high levels of ω6 polyunsaturated fatty acids and slightly enriched δ13C values in reef manta ray tissue suggest that they do not feed solely on pelagic zooplankton, but rather obtain part of their diet from another origin. The closest match was with demersal zooplankton, suggesting it is an important component of the reef manta ray diet. The ability to feed on demersal zooplankton is likely linked to the horizontal and vertical movement patterns of this giant planktivore. These new insights into the habitat use and feeding ecology of the reef manta ray will assist in the effective evaluation of its conservation needs.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Article e77152.

 
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Created: Thu, 28 Nov 2013, 15:28:38 EST by Scarla Weeks on behalf of Scholarly Communication and Digitisation Service