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Within and among-site variability in δ13C and δ15N for three estuarine producers Sporobolus virginicus, Zostera capricorni, and epiphytes of Z. capricorni

Citation

Guest, MA and Connolly, RM and Loneragan, NR, Within and among-site variability in δ13C and δ15N for three estuarine producers Sporobolus virginicus, Zostera capricorni, and epiphytes of Z. capricorni, Aquatic Botany, 79, (1) pp. 87-94. ISSN 0304-3770 (2004) [Refereed Article]

DOI: doi:10.1016/j.aquabot.2004.01.008

Abstract

Carbon and nitrogen stable isotope ratios of three estuarine autotrophs (the seagrass, Zostera capricorni and its epiphytic algae, and the saltcouch grass Sporobolus virginicus) were measured within and among sites in Southern Moreton Bay, Southeast Queensland. For all taxa, isotope ratios were significantly affected by the position of a plant within a site. Carbon signatures of S. virginicus were more enriched at upper elevations (-14.3‰), and more depleted at the lower edge (-15.0‰). Small but significant differences for S. virginicus were also found between edge (-14.7‰) and interior (-14.9‰) positions. Z. capricorni was more depleted in 15N at edge (5.9‰) positions than the interior (6.2‰). The seagrass epiphytes varied along the elevation gradient, being more depleted in 13C at the upper (-19.7‰) than the lower (-19.3‰) edge. This small within-site variation (< 1‰) may result from differences in the physical characteristics among the sites that influence the productivity of plants and thereby their isotope ratios, but would not preclude the use of carbon and nitrogen stable isotopes in small-scale food web studies. At a larger scale, isotope ratios differed significantly among sites separated by several kilometres and the range of this variation was greater for all taxa than at the within-site scale. Differences among sites are probably due to variation in nutrient source and hydrodynamics. © 2004 Elsevier B.V. All rights reserved.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Marine and Estuarine Ecology (incl. Marine Ichthyology)
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Coastal and Estuarine Flora, Fauna and Biodiversity
Author:Guest, MA (Dr Michaela Guest)
ID Code:34539
Year Published:2004
Web of Science® Times Cited:21
Deposited By:TAFI - Marine Research Laboratory
Deposited On:2005-07-28
Last Modified:2005-07-28
Downloads:0

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