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Spatial associations among palatable and unpalatable macroalgae:


Poore, AG and Hill, Nicole, Spatial associations among palatable and unpalatable macroalgae:, Journal of Experimental Marine Biology and Ecology, 326, (2) pp. 207-216. ISSN 0022-0981 (2005) [Refereed Article]

DOI: doi:10.1016/j.jembe.2005.06.002


Associational resistance is the process by which plants may gain protection from spatial associations with neighbouring plants. We tested whether association with an unpalatable alga, Dictyopteris acrostichoides, affects the abundance and colonisation behaviour of the herbivorous amphipod Peramphithoe parmerong on its preferred host alga Sargassum linearifolium. Despite predictions, natural densities on S. linearifolium when surrounded by D. acrostichoides were higher than on isolated individuals of S. linearifolium. Colonisation experiments in the laboratory and the field tested the hypotheses that the observed variation in field abundance with algal neighbourhood was due to variation in the size of habitat patches, physical obstruction of host finding by D. acrostichoides and variation in the relative abundance of S. linearifolium and D. acrostichoides. None of these possible mechanisms was found to significantly alter rates of amphipod colonisation on the scales of individuals selecting among algal pieces in the laboratory or among habitat patches in the field. The failure of colonisation processes to explain observed variation in natural amphipod densities suggests that post-colonisation processes such as survival or emigration may vary with the spatial associations among algae. © 2005 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:Environmental Management
Objective Group:Marine systems and management
Objective Field:Marine biodiversity
UTAS Author:Hill, Nicole (Dr Nicole Hill)
ID Code:58233
Year Published:2005
Web of Science® Times Cited:11
Deposited By:TAFI - Marine Research Laboratory
Deposited On:2009-09-22
Last Modified:2009-09-22

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