Feeding ecology of two sympatric species of Acetes (Decapoda: Sergestidae) in Panguil Bay, the Philippines
Ephrime B. Metillo A E , Emily E. Cadelinia B , Ken-ichi Hayashizaki C , Takashi Tsunoda C and Shuhei Nishida DA Department of Biological Sciences, Mindanao State University-Iligan Institute of Technology, Iligan City 9200, Philippines.
B Department of Natural Sciences, Misamis University, Ozamiz City 7200, Philippines.
C Faculty of Marine Biosciences, Kitasato University, Minami-ku, Sagamihara, Kanagawa 252-0373, Japan.
D Atmosphere and Ocean Research Institute, University of Tokyo, 5-1-5, Kashiwanoha, Kashiwa-shi 277-8564, Japan.
E Corresponding author. Email: ephrime.metillo@g.msuiit.edu.ph
Marine and Freshwater Research 67(10) 1420-1433 https://doi.org/10.1071/MF15001
Submitted: 1 January 2015 Accepted: 5 June 2015 Published: 28 September 2015
Abstract
Sergestid shrimps of the genus Acetes are important in global shrimp fisheries and nearshore food-webs. The feeding habits of the sympatric species Acetes erythraeus and A. intermedius from Panguil Bay, Philippines were studied using gut contents and stable isotopes analyses. Both species are omnivorous suspension feeders of plankton, macrophyte detritus, and amorphous particulate organic materials. However, the diet of adults and juveniles differed by prey type. Gut fullness differed over 24 h with a night-time peak in A. erythraeus and morning and midnight peaks in A. intermedius. Over 1 year gut fullness peaked during July to September for both species, with a minor peak during January for A. intermedius. Stable isotope analysis revealed similar δ15N values, but both species showed ontogenetic and interspecific separation of δ13C. A. erythraeus seemed to assimilate highly depleted carbon food sources by mangrove-based detrital and plankton trophic pathways, whereas A. intermedius relied on plankton and macroalgal and seagrass detrital pathways. These trophic differences may be mechanisms of partitioning the feeding niche, but allotopy in the two species with A. erythraeus confined to more brackish waters and A. intermedius dwelling in more saline marine waters may indicate that habitat niche segregation underlies these contrasting carbon trophic pathways.
Additional keywords: δ15N and δ13C stable isotopes, tropical trophic ecology.
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