Timing of spawning and glochidial release in Scottish freshwater pearl mussel (Margaritifera margaritifera) populations
Timing of spawning and glochidial release in Scottish freshwater pearl mussel (Margaritifera margaritifera) populations
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DOI：
10.1046/j.1365-2427.2003.01153.x
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发表时间：
2003-12-01
影响因子：
2.7
通讯作者：
Young, MR
中科院分区：
文献类型：
--
作者：
Hastie, LC;Young, MR
1.从1993年到2002年，在6个苏格兰淡水珍珠贻贝种群的繁殖时间进行了调查。检查妊娠雌体并监测贻贝幼虫（钩介）的释放。每年的产卵（产卵）和吐出（钩介释放）事件分别发生在6 - 7月和6 - 9月.河流之间的时间差异似乎与水温有关。在最温暖的河流中，贻贝往往会先产卵和吐出，反之亦然。温度变化似乎也影响了河流内繁殖的时间，在寒冷的年份，繁殖时间可能会推迟几周。每年钩介体释放的间隔至少为3000度-日。产卵的时间是逐渐确定的，可能是由热积累效应。释放阶段是一个突然的同步事件，大多数钩介幼虫的产卵时间超过1-2天，表明它是由环境因素触发的。水温和/或河流水位的突然变化往往会导致口角，其根本机制可能是呼吸。
1. The timing of reproduction was investigated in six Scottish freshwater pearl mussel populations from 1993 to 2002. Gravid females were examined and the release of mussel larvae (glochidia) was monitored.2. Annual spawning (oviposition) and spat (glochidial release) events occurred during June to July and June to September, respectively.3. Between-river differences in timing seem to be related to water temperature. Mussels in the warmest rivers tend to spawn and spat first, and vice-versa.4. Thermal variations also seem to influence the timing of reproduction within rivers, which can be delayed by several weeks during cold years. At least 3000degrees-days occur between annual episodes of glochidial release.5. The timing of spawning is determined gradually, probably by a thermal summation effect.6. The release stage occurs as a sudden, synchronised event, with most of the glochidia spat over 1-2 days, indicating that it is triggered by an environmental cue. Sudden changes in water temperature and/or river level often result in spats, and the underlying mechanism may be respiratory.