Details

Autor(en) / Beteiligte

• Molina, Wagner Franco
• Galetti, Pedro Manoel

Titel

Karyotypic changes associated to the dispersive potential on Pomacentridae (Pisces, Perciformes)

Ist Teil von

• Journal of experimental marine biology and ecology, 2004-09, Vol.309 (1), p.109-119

Ort / Verlag

Amsterdam: Elsevier B.V

Erscheinungsjahr

2004

Link zum Volltext

Quelle

Access via ScienceDirect (Elsevier)

Beschreibungen/Notizen

• When comparing karyotypic diversification between freshwater and marine fish, a notable increase in modifications associated to the former environment can be noticed in relation to the latter one. This fact is related to the great number of physical partitions (barriers) that exist in continental waters. Furthermore, in the marine environment, the barriers to the gene flow are complex and not always identifiable, especially when considering the participation of dynamic factors such as currents and winds associated to the dispersive potentialities of a living group. Within Perciformes fish, the Pomacentridae family stands out from the others for its intimate relation with the coral reefs, as well as for its diversity of forms and biological characteristics, providing an adequate model for studying the influence of the pelagic period of the larval stage upon the karyotypic evolution. In the present work, cytogenetic analyses were carried out on three Pomacentridae species, typical representatives of the coral reefs, Abudefduf saxatilis (2n=48, FN=52, 2 m+2sm+44a), Microspathodon chrysurus (2n=48, FN=64, 6 m+10st+32a) and Amphiprion frenatus (2n=48, FN=92, 14 m+22sm+8st+4a) that have different pelagic larval periods. The analyses between subfamilies showed a trend that the lower the dispersive potential, the greater the quantity of fixed pericentric inversions based on the basal karyotype of the Perciformes.