Resource distribution influences positive edge effects in in a seagrass fish

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Show simple item record Macreadie, PI Hindell, JS Keough, MJ Jenkins, GP Connolly, RM 2011-02-07T06:19:50Z 2010-07
dc.identifier.citation Ecology, 2010, 91 (7), pp. 2013 - 2021
dc.identifier.issn 0012-9658
dc.identifier.other C1UNSUBMIT en_US
dc.description.abstract According to conceptual models, the distribution of resources plays a critical role in determining how organisms distribute themselves near habitat edges. These models are frequently used to achieve a mechanistic understanding of edge effects, but because they are based predominantly on correlative studies, there is need for a demonstration of causality, which is best done through experimentation, Using artificial seagrass habitat as an experimental system, we determined a likely mechanism underpinning edge effects in a seagrass fish. To test for edge effects, we measured fish abundance at edges (0-0.5 m) and interiors (0.5-1 m) of two patch configurations: continuous (single, continuous 9-m2 patches) and patchy (four discrete 1-m2 patches within a 9-m2 area). In continuous configurations, pipefish (Stigmatopora argus) were three times more abundant at edges than interiors (positive edge effect), but in patchy configurations there was no difference. The lack of edge effect in patchy configurations might be because patchy seagrass consisted entirely of edge habitat. We then used two approaches to test whether observed edge effects in continuous configurations were caused by increased availability of food at edges. First, we estimated the abundance of the major prey of pipefish, small crustaceans, across continuous seagrass configurations. Crustacean abundances were highest at seagrass edges, where they were 16% greater than in patch interiors. Second, we supplemented interiors of continuous treatment patches with live crustaceans, while control patches were supplemented with seawater. After five hours of supplementation, numbers of pipefish were similar between edges and interiors of treatment patches, while the strong edge effects were maintained in controls. This indicated that fish were moving from patch edges to interiors in response to food supplementation. These approaches strongly suggest that a numerically dominant fish species is more abundant at seagrass edges due to greater food availability, and provide experimental support for the resource distribution model as an explanation for edge effects. © 2010 by the Ecological Society of America.
dc.language eng
dc.relation.isbasedon 10.1890/08-1890.1
dc.title Resource distribution influences positive edge effects in in a seagrass fish
dc.type Journal Article
dc.description.version Published
dc.parent Ecology
dc.journal.volume 7
dc.journal.volume 91
dc.journal.number 7 en_US
dc.publocation Washington en_US
dc.identifier.startpage 2013 en_US
dc.identifier.endpage 2021 en_US SCI.Environmental Sciences en_US
dc.conference Verified OK en_US
dc.for 0602 Ecology
dc.personcode 102385
dc.personcode 108249
dc.percentage 100 en_US Ecology en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom en_US en_US
dc.location.activity ISI:000279563700020 en_US
dc.description.keywords Artificial seagrass
dc.description.keywords Ecological flow
dc.description.keywords Edge effects
dc.description.keywords Food supplementation
dc.description.keywords Habitat fragmentation
dc.description.keywords Patchiness
dc.description.keywords Pipefish
dc.description.keywords Resource distribution model
dc.description.keywords Spillover
dc.description.keywords Stigmatopora argus
pubs.embargo.period Not known
pubs.organisational-group /University of Technology Sydney
pubs.organisational-group /University of Technology Sydney/Faculty of Arts and Social Sciences
pubs.organisational-group /University of Technology Sydney/Faculty of Science
pubs.organisational-group /University of Technology Sydney/Strength - C3
utslib.copyright.status Closed Access 2015-04-15 12:17:09.805752+10
pubs.consider-herdc false
utslib.collection.history Closed (ID: 3)

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