INVESTIGADORES
LOVRICH Gustavo Alejandro
congresos y reuniones científicas
Título:
MUNIDA GREGARIA AND M. SUBRUGOSA (DECAPODA: ANOMURA: GALATHEIDAE): TWO SPECIES?
Autor/es:
PÉREZ BARROS, PATRICIA; MARIA EUGENIA D´AMATO; LOVRICH, GUSTAVO A.
Lugar:
Ciudad El Cabo
Reunión:
Congreso; Southern Connections; 2004
Resumen:
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The galatheid genus Munida is worldwide distributed, being
represented by about 100 species around the world. Nevertheless, only 4 species
- M. spinosa, M. iris, M. gregaria and M. subrugosa -
occur in the waters surrounding the southern tip of South
America. M. gregaria and M. subrugosa are restricted
in their occurrence to the southern hemisphere off New
Zealand and South America,
where they are found in large benthic concentrations. Their specific status has
long been discussed; being postulated that M. gregaria and M.
subrugosa from Otago (New
Zealand) are the pelagic and benthic forms
(respectively) of a single species. However, in the Beagle Channel (Argentina, 55°S 68°W) both species are benthic.
Samples of
M. gregaria and M. subrugosa from the Beagle Channel, the Strait of Magellan and the Burwood Bank were used for
this analysis. Fragments of the mitochondrial genes: 16S, COI and ND1, and the
nuclear ITS1 were amplified and sequenced.
M. gregaria
and M. subrugosa showed identical 16S and ITS1 sequences. COI and
ND1 presented 12 and 15 variable sites, respectively; but none of them were
parsimony informative. Average interspecific Tamura-Nei distances were 0.240 ±
0.077% and 0.396 ± 0.112% for COI and ND1, respectively;
and were not significantly different from intraspecific distances
(Kruskal-Wallis test: p=0.49 and p=0.97, for COI and ND1
respectively). Statistic parsimony networks for both COI and ND1 showed a
star-like shape, with no correspondence with geographical location or
morphology, and compatible with a recent population expansion.
Overall, we found no genetic differences
to validate the phenotypic differentiation of individuals of M. gregaria
and M. subrugosa in two different species. Possible explanations are
either that the molecular markers used in this study dont have the adequate
resolution to detect a recent speciation event; or that that we are dealing
with two forms rather than two species.
