The diet of the Harlequin crab Lissocarcinus orbicularis, an obligate symbiont of  sea cucumbers (holothuroids) belonging to the genera Thelenota, Bohadschia and Holothuria

Caulier, Guillaume; Lepoint, Gilles; Van Nedervelde, Fleur; Eeckhaut, Igor

doi:10.1007/s13199-014-0274-2

Reference : The diet of the Harlequin crab Lissocarcinus orbicularis, an obligate symbiont of se...


	Document type :	Scientific journals : Article
	Discipline(s) :	Life sciences : Zoology
	To cite this reference:	http://hdl.handle.net/2268/163669

Title :	The diet of the Harlequin crab Lissocarcinus orbicularis, an obligate symbiont of sea cucumbers (holothuroids) belonging to the genera Thelenota, Bohadschia and Holothuria
Language :	English
Author, co-author :	Caulier, Guillaume [Université de Mons - UMONS > > Biologie Marine et Biomimétismes > >]
	Lepoint, Gilles [Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Océanologie >]
	Van Nedervelde, Fleur [Université Libre de Bruxelles - ULB > > Laboratory of Systems Ecology and Resource Management > >]
	Eeckhaut, Igor [Université de Mons - UMONS > > Biologie Marine et Biomimétisme > >]
Publication date :	2014
Journal title :	Symbiosis
Peer reviewed :	Yes
Audience :	International
ISSN :	0334-5114
Keywords :	[en] symbiosis ; crustacean ; stable isotopes ; madagascar ; coral reef ; sea cucumber
Abstract :	[en] The present paper characterizes, for the first time, the diet of the Harlequin crab, Lissocarcinus orbicularis an obligate symbiotic crab that associates with sea cucumbers (holothuroids) belonging to the genera Thelenota, Bohadschia and Holothuria. These tropical holothuroids host a rich symbiotic community in the Indo-West Pacific Ocean of which the Harlequin crab is the best known. The diet of L. orbicularis was characterized by analyzing the microscopic, molecular and isotopic signatures obtained from its gastric content. The presence of sea cucumber ossicles in the gastric mills of the crabs suggests that symbionts eat the superficial integument of their host and this was suppoarted by the fact that Holothuroid DNA was detected in the stomach of L.orbicularis after DGGE and sequencing of the 18S rDNA gene. The stable isotopic δ13C and δ15N values of crab tissues were compared with diverse potential food sources including the three holothuroids, three algae, one sea grass as well as the organic matter contained in the water column, in the sediment, and the second most abundant symbiont, the polychaete Gastrolepidia clavigera. The low δ15N values of crabs suggest that the crabs do not exclusively feed on sea cucumber tissue but assimilate diverse food sources such as sea grasses and organic matter contained in sediment that have similar δ13C values. There were no difference between the feeding of males and females but there was a positive correlation between the carapace length and the stable isotopic values indicating a shift of the food source as crabs grow larger.
Funders :	Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
Name of the research project :	Echinoderm Symbiosis
Target :	Researchers ; Students
Permalink :	http://hdl.handle.net/2268/163669
DOI :	10.1007/s13199-014-0274-2
Other URL :	http://link.springer.com/article/10.1007/s13199-014-0274-2

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