Early life stages of Dreissena polymorpha (zebra mussel): the importance of long-term datasets in invasion ecology.
Early life stages of Dreissena polymorpha (zebra mussel): the importance of long-term datasets in invasion ecology.
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DOI：
10.3391/ai.2006.1.3.12
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发表时间：
2006
影响因子：
1.6
通讯作者：
F. Lucy
中科院分区：
文献类型：
--
作者：
F. Lucy
1998-2003年繁殖季节，在爱尔兰罗斯科蒙的基湖（Lough Key, Co. Roscommon）研究了多形鱼（Dreissena polymorpha）的早期生活阶段。这包括每周采样幼虫/幼虫密度、大小分布和沉降密度。1998年的低幼虫密度和成虫密度表明，这是基湖显著繁殖的第一年。1998 - 2003年不同采样周、年份和监测点的季节幼虫密度、幼虫大小分布和幼虫沉降模式存在差异。在入侵初期（1998-2000年），幼虫密度和幼虫沉降量呈年际变化。1998 ~ 2000年幼虫密度和定居水平呈上升趋势，是典型的指数生长早期阶段。从斑马贻贝成虫数量的指数增长可以看出，这些年的成功捕集水平很高。在随后的几年里，这些差异可能与夏季水温和食物供应的环境变化有关。2001年，与目前的幼虫密度相比，定居估计极低。2003年夏季水温持续变暖，导致繁殖季节变长，定居率也很高。本研究中观测到的年度数据集之间的差异表明，需要对多形鱼的早期生命阶段进行长期研究，以监测该物种在湖泊生态系统中的动态。
The early life stages of Dreissena polymorpha were studied in Lough Key, Co. Roscommon, Ireland during the reproductive season, 1998-2003. This involved weekly sampling of larval/veliger density, size distributions and settlement density. Low larval and adult densities of Dreissena in 1998 indicated that this was the first year of significant reproduction in Lough Key. Variation existed in seasonal larval densities, larval size distributions and juvenile settlement patterns among sampling weeks, years and monitoring sites from 1998 to 2003. In the early years of invasion (1998-2000) annual variations were observed in larval density and juvenile settlement. Increasing levels of larval density and settlement from 1998 to 2000 were typical for the early exponential growth phase of Dreissena invasions. The high level of successful recruitment in those years was evident from the exponential increase of the adult zebra mussel population. In subsequent years, these differences were likely related to environmental variations in summer water temperatures and food availability for veligers. In 2001, settlement estimates were extremely low relative to the larval densities present. Prolonged warm water temperatures in summer 2003, resulted in a long reproductive season and also high settlement rates. The variation between annual datasets observed in this study, implies that long term studies of the early life stages of Dreissena polymorpha is required to monitor the dynamics of this species within lake ecosystems.