期刊
JOURNAL OF FISH BIOLOGY
卷 80, 期 3, 页码 705-712出版社
WILEY-BLACKWELL
DOI: 10.1111/j.1095-8649.2011.03197.x
关键词
estuarine fish; macrophyte senescence; South Africa; stable isotopes
资金
- National Research Foundation (NRF) of South Africa
The ecological importance of submerged macrophyte beds to fishes within estuaries was investigated through the example of the ubiquitous Cape stumpnose Rhabdosargus holubi, an omnivorous, vegetation and estuary-dependent species, using stable-isotope techniques and long-term abundance (catch-per-unit-effort) data from the East Kleinemonde Estuary, South Africa. Outputs from a Bayesian mixing model using d13C and d15N signatures indicated that the submerged macrophytes Ruppia cirrhosa and Potamogeton pectinatus were not a primary source of nutrition for R. holubi, confirming previous work that revealed that macrophytes are consumed but not digested. Long-term seine netting data showed reduced abundance of R. holubi during a prolonged period of macrophyte senescence, suggesting that submerged macrophyte habitats provide shelter that reduces mortality (predation risk) and a food-rich foraging area.
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