The role of schizogenesis in population dynamics of Timarete filigera (Polychaeta: Cirratulidae): 2-years observations in the Port of Bari (South Adriatic Sea)

摘要: Different aspects of reproductive biology the polychaete Timarete filigera (Delle Chiaje) were studied during a period 2 years (from September 2002 to August 2003 and from 2004 2005). specimens collected monthly in port Bari (South Adriatic Sea, Mediterranean Sea). For population analysis, regenerating entire separately analyzed, individuals assigned different categories related region body which they derived. Regenerating present throughout year. There three four times more deriving middle part than anterior posterior portions. From high percentage observed T. population, it can be supposed that this species reproduces mainly asexually by schizogenesis. However, histological analysis revealed presence female gametes few individuals. In contrast, males never collected, probably due limited number collected. The abundance has shown wide fluctuations year, with decrease Winter Spring. size-frequency histograms growing phase whole Spring Winter. life cycle investigated is discussed hypothesis strategies could linked colonized environments, agamic reproduction coupled sexual assures expansion after colonization larvae.