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precedente: S2.4
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livello superiore: S2
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seguente: S2.6
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S2.5 - Genetic and morphometric evidence for unresolved species boundaries in
the coral genus Psammocora (Cnidaria; Scleractinia)
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Stefani Fabrizio (1)*,
Benzoni Francesca (1),
Galli Paolo (1),
Pichon Michel (2),
Mitta Guillaume (3)
| (1) |
Dipart. di Biotecnologie e Bioscienze, Università degli Studi
di Milano Bicocca, Piazza della Scienza 2, 20126 Milano, Italia |
| (2) |
Laboratoire de Ecosystèmes Aquatiques Tropicaux et
Méditerranéens, Ecole Pratique des Hautes Etudes, UMR 8046 CNRS,
Perpignan, France |
| (3) |
Laboratoire de Parasitologie Fonctionnelle et Évolutive,
Université de Perpignan, UMR 5555 CNRS, Perpignan, France |
| * |
fabrizio.stefani@unimib.it |
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A morphological and molecular characterization of four species of the
Scleractinian genus Psammocora, namely P. digitata, P.
haimeana, P. profundacella and P. contigua was conducted. The
multivariate analyses of descriptive and morphometric characters confirmed the
distinction of P. digitata and P. contigua. P. haimeana,
P. profundacella, while their intermediate morph P.
haimeana-profundacella differentiated on the basis of morphologic characters
only. Objective morphometric characters allowed a less defined distinction,
and morphological boundaries essentially intergraded in a gradient driven by
enclosed corallite series characters. The phylogenetic analysis of the ITS
region confirmed the morphological inferences. P. digitata resulted as a
distinct evolutionary lineage. Despite its low divergence, the identity of
P. contigua as distinct gene pool is confirmed. Conversely, the other
three morphs, P. haimeana, P. profundacella and their intermediate
constitute a single gene pool distinct from the others. Recent divergence of
P. contigua is emphasized. The different approaches suggested that P. haimeana, P. profundacella can not be considered as distinct
entities. The studied colonies belong to the same gene pool showing highly
variable morphological characters. Such morphological variability possibly
depends on environmental factors such as light conditions.
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consulta l' Indice analitico (alfabetico per autore) |
sfoglia l' Indice delle sessioni del Congresso |
a cura di Comoglio, Comino, e Bona
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