Characteristics of the infestation of Seriatopora corals by the coral gall crab Hapalocarcinus marsupialis Stimpson, 1859 on the great reef of toliara, Madagascar
[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/Unit :
MARE - Centre Interfacultaire de Recherches en Océanologie - ULiège
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
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