Habitat selectivity of megalopae and juvenile mud crabs (Scylla serrata): implications for recruitment mechanism

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Title Habitat selectivity of megalopae and juvenile mud crabs (Scylla serrata): implications for recruitment mechanism
Author Webley, James Anthony Charles; Connolly, Rod Martin; Young, Ruth Anne
Journal Name Marine Biology
Year Published 2009
Place of publication Germany
Publisher Springer
Abstract Megalopae of several crab species exhibit active habitat selection when settling. These megalopae usually select structurally complex habitats which can provide refuge and food. The portunid mud crab, Scylla serrata, is commonly found within the muddy estuaries of the Indo-West Pacific after attaining a carapace width >40 mm. Despite substantial efforts, the recruitment mechanism of juvenile mud crabs to estuaries is not understood because their megalopae and early stage crablets (carapace width <30 mm) are rarely found. We used laboratory experiments to determine whether megalopae and early stage crablets are selective among three estuarine habitats which commonly occur in Queensland, Australia. These animals were placed in arenas where they had a choice of habitats: seagrass, mud or sand, and arenas where they had no choice. Contrary to the associations exhibited by other portunid crab megalopae, S. serrata megalopae were not selective among these estuarine habitats, suggesting that they tend not to encounter these habitats, or, gain no advantage by selecting one over the others. The crablets, however, strongly selected seagrass, suggesting that residing within seagrass is beneficial to the crablets and likely increases survival. This supports the model that for S. serrata, crablets and not megalopae tend to colonise estuaries, since a selective behaviour has evolved within crablets but not megalopae.
Peer Reviewed Yes
Published Yes
Alternative URI http://dx.doi.org/10.1007/s00227-009-1134-0
Copyright Statement Copyright 2009 Springer Berlin / Heidelberg. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. The original publication is available at www.springerlink.com
Volume 156
Issue Number 5
Page from 891
Page to 899
ISSN 0025-3162
Date Accessioned 2009-11-24
Language en_AU
Research Centre Australian Rivers Institute
Faculty Faculty of Science, Environment, Engineering and Technology
Subject Marine and Estuarine Ecology (incl Marine Ichthyology)
URI http://hdl.handle.net/10072/29290
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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