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首页> 外文期刊>Marine ecology >The role of schizogenesis in population dynamics of Timarete filigera (Polychaeta: Cirratulidae): 2-years observations in the Port of Bari (South Adriatic Sea)
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The role of schizogenesis in population dynamics of Timarete filigera (Polychaeta: Cirratulidae): 2-years observations in the Port of Bari (South Adriatic Sea)

机译：裂殖发生在Timarete filigera（Polychaeta：Cirratulidae）种群动态中的作用：在巴里港（南亚得里亚海）的两年观测

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摘要

Different aspects of reproductive biology of the polychaete Timarete filigera (Delle Chiaje) were studied during a period of 2 years (from September 2002 to August 2003 and from September 2004 to August 2005). Timarete filigera specimens were collected monthly in the port of Bari (South Adriatic Sea, Mediterranean Sea). For population analysis, regenerating and entire specimens were separately analyzed, the regenerating individuals were assigned to different categories related to the region of the body from which they derived. Regenerating individuals were present throughout the year. There were three to four times more individuals deriving from the middle part than the anterior and posterior regenerating portions. From the high percentage of regenerating individuals observed in the T. filigera population, it can be supposed that this species reproduces mainly asexually by schizogenesis. However, histological analysis revealed the presence of female gametes in a few individuals. In contrast, males were never collected, probably due to the limited number of reproductive individuals collected. The abundance has shown wide fluctuations during the year, with a decrease from Winter to Spring. The analysis of the size-frequency histograms has shown a growing phase of whole specimens from Spring to Winter. The life cycle of the investigated species is discussed with the hypothesis that strategies could be linked to the colonized environments, agamic reproduction coupled with sexual reproduction assures the presence and expansion of the population after the colonization by a limited number of larvae.
机译：在两年的时间里（从2002年9月到2003年8月以及从2004年9月到2005年8月），研究了多毛Tim（Timarete filigera）（Delle Chiaje）生殖生物学的不同方面。每月在巴里港（南亚得里亚海，地中海）收集蒂马雷特果的标本。为了进行种群分析，分别对再生和整个标本进行了分析，将再生个体分配到与它们衍生的身体区域相关的不同类别。全年都有再生个体出现。来自中部的个体比前部和后部再生部分多三到四倍。从T. filigera种群中观察到的高比例的再生个体中，可以认为该物种主要通过分裂发生无性繁殖。但是，组织学分析显示在少数个体中存在雌配子。相反，从未收集过雄性，这可能是由于收集的生殖个体数量有限。一年中的丰度显示出很大的波动，从冬季到春季有所减少。对大小频率直方图的分析显示，从春季到冬季，整个标本处于一个增长阶段。讨论了被调查物种的生命周期，并提出了以下假设：策略可以与定居环境联系在一起，无性繁殖与有性繁殖相结合，可以确保在数量有限的幼虫定居后种群的存在和扩展。

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