Article (Scientific journals)
Characteristics of the infestation of Seriatopora corals by the coral gall crab Hapalocarcinus marsupialis Stimpson, 1859 on the great reef of toliara, Madagascar
Terrana, Lucas; Caulier, Guillaume; Todinanahary, Gildas et al.
2016In Symbiosis, 69 (2), p. 113-122
Peer reviewed
 

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Keywords :
Coral gall crab; Stony coral; Cryptochiridae; Madagascar; coraf reef; symbiosis; stable isotopes
Abstract :
[en] This study describes the association between the obligatory symbiont coral gall crab Hapalocarcinus marsupialis and its stony coral hosts Seriatopora sp .within the Great Reef of Toliara in Madagascar and attempts to dis- cuss their symbiotic status through comparison with previous studies. These corals are inhabited by crabs living in galls that can be categorised in four distinct morphological stages, where the first one corresponds to a small bud and the last one represents a completely closed gall surrounding the crab inside. Within the reef, 563 colonies of Seriatopora species were observed by scuba-diving at ten different stations: 37.8 % of them were infested by H. marsupialis , with a total of 763 galls, and with a majority of stage 4 galls. Galls are monopolised by females that can have different morphologies. Females store the sperm in two spermathecae and are fertilised when their morphology and size are similar to males and the gall is not closed. Histological observations coupled with scanning electronic microscopy analyses show that closed galls are made of an external living tissue, a mid skeletal layer and an internal living tissue. The internal living tissue includes polyps similar to the external tissue, some of them being sex- ually mature. Nitrogen and carbon isotopic signatures confirmed that these crabs are filter-feeders and do not feed on their host. This association perfectly highlights the difficul- ties to define the symbiotic status of a symbiont if one con- siders inflexible the three categories of symbiosis commonly defined.
Research center :
MARE - Centre Interfacultaire de Recherches en Océanologie - ULiège
Disciplines :
Environmental sciences & ecology
Aquatic sciences & oceanology
Zoology
Author, co-author :
Terrana, Lucas;  Université de Mons - UMONS > Biologie Marine et Biomimétisme
Caulier, Guillaume;  Université de Mons - UMONS > Biologie Marine et Biomimétisme
Todinanahary, Gildas;  Institut d'Halieutique et de Sciences Marine de Tuléar (Madagascar) > Unité de Polyaquaculture
Lepoint, Gilles  ;  Université de Liège > Département de Biologie, Ecologie et Evolution > Océanographie biologique
Eeckhaut, Igor;  Université de Mons - UMONS > Laboratoire de Biologie Marine et de Biomimétisme
Language :
English
Title :
Characteristics of the infestation of Seriatopora corals by the coral gall crab Hapalocarcinus marsupialis Stimpson, 1859 on the great reef of toliara, Madagascar
Publication date :
2016
Journal title :
Symbiosis
ISSN :
0334-5114
eISSN :
1878-7665
Publisher :
Springer
Volume :
69
Issue :
2
Pages :
113-122
Peer reviewed :
Peer reviewed
Name of the research project :
DÉVELOPPEMENT DE POLYAQUACULTURES DANS LES VILLAGES CÔTIERS DU SUD-OUEST ET DU NORD DE MADAGASCAR
Funders :
CUD - Commission Universitaire pour le Développement [BE]
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