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Authors Paterson, AW; Whitfield, AK
Author Full Name Paterson, AW; Whitfield, AK
Title A stable carbon isotope study of the food-web in a freshwater-deprived South African estuary, with particular emphasis on the ichthyofauna
Source ESTUARINE COASTAL AND SHELF SCIENCE
Language English
Document Type Article
Author Keywords carbon isotope; estuary; macrophyte; plankton; fish; salt marsh; Kariega Estuary; South Africa
Keywords Plus GEORGIA SALT-MARSH; EASTERN CAPE ESTUARIES; SEAGRASS MEADOWS; SPARTINA-ALTERNIFLORA; OUTWELLING HYPOTHESIS; KARIEGA ESTUARY; DETRITUS; EELGRASS; RATIOS; FISHES
Abstract The importance of macrophytes as food sources for estuarine nekton is unclear. Previous carbon isotope investigations in the macrophyte-dominated, freshwater-deprived Kariega Estuary showed that the bivalve Solen cylindraceus did not utilize the dominant estuarine macrophytes found within the estuary as a primary food source. This finding prompted questions as to what the nekton of this estuary utilize as primary energy sources. delta(13)C analyses of the principal autochthonous and allochthonous primary carbon sources, as well as the dominant invertebrate and fish species, indicate that there are two main carbon pathways within the Kariega Estuary. The littoral community, which incorporates the majority of crustaceans, gobies, muller: and a sparid, utilizes delta(13)C enriched primary food sources namely Spartina maritima, Zostera capensis and epiphytes. The channel fauna, which includes the zooplankton, zooplanktivorous and piscivorous fish, utilizes a primary food source depleted in delta(13)C, which is most likely a mixture of phytoplankton, terrestrial plant debris and C, macrophyte detritus. The C, saltmarsh macrophytes Sarcocormia perennis and Chenolea diffusa, as well as benthic microalgae, appear to be less important as primary food sources to the nekton of the Kariega Estuary. (C) 1997 Academic Press Limited.
Author Address JLB Smith Inst Ichthyol, Grahamstown, South Africa
Reprint Address Paterson, AW (corresponding author), JLB Smith Inst Ichthyol, Grahamstown, South Africa.
ResearcherID Number Whitfield, Alan K./M-1248-2017
ORCID Number Whitfield, Alan K./0000-0003-1452-7367; Paterson, Angus/0000-0001-5507-0506
Times Cited 70
Total Times Cited Count (WoS, BCI, and CSCD) 76
Publisher ACADEMIC PRESS LTD
Publisher City LONDON
Publisher Address 24-28 OVAL RD, LONDON NW1 7DX, ENGLAND
ISSN 0272-7714
29-Character Source Abbreviation ESTUAR COAST SHELF S
ISO Source Abbreviation Estuar. Coast. Shelf Sci.
Publication Date DEC
Year Published 1997
Volume 45
Issue 6
Beginning Page 705
Ending Page 715
Digital Object Identifier (DOI) 10.1006/ecss.1997.0243
Page Count 11
Web of Science Category Marine & Freshwater Biology; Oceanography
Subject Category Marine & Freshwater Biology; Oceanography
Document Delivery Number YR164
Unique Article Identifier WOS:000071466700001
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