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Authors Guest, MA; Connolly, RM; Loneragan, NR
Author Full Name Guest, MA; Connolly, RM; Loneragan, NR
Title Within and among-site variability in delta C-13 and delta N-15 for three estuarine producers, Sporobolus virginicus, Zostera capricorni, and epiphytes of Z-capricorni
Source AQUATIC BOTANY
Language English
Document Type Article
Author Keywords isotopic variability; seagass; saltcouch grass; epiphytic algae
Keywords Plus STABLE-ISOTOPE COMPOSITION; CARBON-ISOTOPE; SPATIAL VARIATION; MORETON BAY; FOOD-WEB; SEAGRASS; AUSTRALIA; RATIOS; PLANTS; FISH
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 (-14.3parts per thousand), and more depleted at the lower edge (-15.0parts per thousand). Small but significant differences for S. virginicus were also found between edge (-14.7parts per thousand) and interior (-14.9parts per thousand,) positions. Z. capricorni was more depleted in N-15 at edge (5.9parts per thousand) positions than the interior (6.2parts per thousand). The seagrass epiphytes varied along the elevation gradient, being more depleted in C-13 at the upper (-19.7parts per thousand) than the lower (-19.3parts per thousand) edge. This small within-site variation (< 1parts per thousand) 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 ill nutrient Source and hydrodynamics. (C) 2004 Elsevier B.V. All rights reserved.
Author Address Griffith Univ, Gold Coast Mail Ctr, Sch Environm & Appl Sci, Nathan, Qld 4111, Australia; CSIRO, Marine Res, Cleveland, Qld 4163, Australia; Griffith Univ, Ctr Aquat Proc & Pollut, Griffith, NSW, Australia; Indooroopilly Sci Ctr, Cooperat Res Ctr Coastal Zone, Indooroopilly, Qld 4068, Australia
Reprint Address Guest, MA (corresponding author), Griffith Univ, Gold Coast Mail Ctr, Sch Environm & Appl Sci, Gold Coast Campus,PMB 50, Nathan, Qld 4111, Australia.
E-mail Address m.guest@griffith.edu.au
ResearcherID Number Loneragan, Neil/A-3386-2008; Connolly, Rod M/C-4094-2008
ORCID Number Loneragan, Neil/0000-0003-2536-8656; Connolly, Rod M/0000-0001-6223-1291
Times Cited 23
Total Times Cited Count (WoS, BCI, and CSCD) 23
Publisher ELSEVIER SCIENCE BV
Publisher City AMSTERDAM
Publisher Address PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
ISSN 0304-3770
29-Character Source Abbreviation AQUAT BOT
ISO Source Abbreviation Aquat. Bot.
Publication Date MAY
Year Published 2004
Volume 79
Issue 1
Beginning Page 87
Ending Page 94
Digital Object Identifier (DOI) 10.1016/j.aquabot.2004.01.008
Page Count 8
Web of Science Category Plant Sciences; Marine & Freshwater Biology
Subject Category Plant Sciences; Marine & Freshwater Biology
Document Delivery Number 819KH
Unique Article Identifier WOS:000221313300007
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