Extensive geographic and ontogenetic variation characterizes the trophic ecology of a temperate reef fish on southern California (USA) rocky reefs

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Hamilton, S. L., Caselle, J. E., Lantz, C. A., Egloff, T. L., Kondo, E., Newsome, S. D., … Lowe, C. G. (2011). Extensive geographic and ontogenetic variation characterizes the trophic ecology of a temperate reef fish on southern California (USA) rocky reefs. Marine Ecology Progress Series, 429, 227-244. doi:10.3354/meps09086
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TitleExtensive geographic and ontogenetic variation characterizes the trophic ecology of a temperate reef fish on southern California (USA) rocky reefs
AuthorsL. Hamilton, E. Caselle, A. Lantz, L. Egloff, E. Kondo, D. Newsome, K. Loke-Smith, J. Pondella II, A. Young, G. Lowe
AbstractInteractions between predator and prey act to shape the structure of ecological communities, and these interactions can differ across space. California sheephead Semicossyphus pulcher are common predators of benthic invertebrates in kelp beds and rocky reefs in southern California, USA. Through gut content and stable isotope (δ 13C and δ 15N) analyses, we investigated geographic and ontogenetic variation in trophic ecology across 9 populations located at island and mainland sites throughout southern California. We found extensive geographic variation in California sheephead diet composition over small spatial scales. Populations differed in the proportion of sessile filter/suspension feeders or mobile invertebrates in the diet. Spatial variation in diet was highly correlated with other life history and demographic traits (e.g. growth, survivorship, reproductive condition, and energy storage), in addition to proxies of prey availability from community surveys. Multivariate descriptions of the diet from gut contents roughly agreed with the spatial groupings of sites based on stable isotope analysis of both California sheephead and their prey. Ontogenetic changes in diet occurred consistently across populations, despite spatial differences in size structure. As California sheephead increase in size, diets shift from small filter feeders, like bivalves, to larger mobile invertebrates, such as sea urchins. Our results indicate that locations with large California sheephead present, such as many marine reserves, may experience increased predation pressure on sea urchins, which could ultimately affect kelp persistence. © Inter-Research 2011.
JournalMarine Ecology Progress Series
Date2011
Start page227
End page244
ISSN01718630
Subjectsbivalve, demography, dietary shift, echinoderm, filter feeder, kelp forest, marine park, multivariate analysis, ontogeny, perciform, population size, population structure, predator-prey interaction, prey availability, reef, spatial variation, stable isotope, California, United States, Bivalvia, Echinoidea, Invertebrata, Semicossyphus pulcher
NoteCited By (since 1996):6, CODEN: MESED

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