Implications of movement behavior on mussel dislodgement: exogenous selection in a Mytilus spp. hybrid zone
Implications of movement behavior on mussel dislodgement: exogenous selection in a Mytilus spp. hybrid zone
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运动行为对贻贝移位的影响：贻贝属的外源选择。
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
T. J. Hilbish
中科院分区：
文献类型：
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作者：
K. Schneider;D. Wethey;B. Helmuth;T. J. Hilbish
摘要岩石潮间带栖息地往往表现出高水平的环境异质性，和生物体之间的移动能力的微生境可能有一个深远的影响，他们的死亡率和整体健身。贻贝复合体中的贻贝在形态上非常相似，但在英格兰西南部这些物种杂交的地点，种群反复显示出对具有M等位基因的个体进行选择的证据。edulis Linnaeus的等位基因，而具有M.拉马克在2001年的冬季（2月）和夏季（7月），这两个物种的差异运动速率进行了研究模拟贻贝床（砾石基板）。M. edulis样贻贝比M.像河蚌一样的贻贝结合2001年7月在该领域进行的附着强度的测量，我们使用了波浪力模型来研究在一定范围的水速度下每个物种的移位的概率。结果表明，M. edulis由于暴露于大的流体动力而比M经历更高的移位率。galloprovincialis。由于较低的附着强度，M。edulis的死亡率也高于M. galloprovincialis在床的内部部分。因此，差异运动行为可能有助于差异基因型特异性死亡率观察贻贝属。杂交区在英格兰西南部，是一个例子的行为可能修改率外源选择在潮间带杂交区。
Abstract Rocky intertidal habitats often exhibit high levels of environmental heterogeneity, and the ability of organisms to move between microhabitats is likely to have a profound influence on their rates of mortality and overall fitness. Mussels within the Mytilus edulis complex are morphologically very similar, yet at sites where these species hybridize in southwest England, populations repeatedly show evidence of selection against individuals with alleles specific to M. edulis Linnaeus, in favor of those with alleles specific to M. galloprovincialis Lamarck. Differential movement rates of these two species were examined within simulated mussel beds (gravel substrate) in the winter (February) and summer (July) of 2001. M. edulis-like mussels moved more frequently and more quickly to the exterior of gravel beds than did M. galloprovincialis-like mussels. Coupled with measurements of attachment strength in the field conducted in July 2001, we used a wave force model to examine the probability of dislodgement for each species under a range of water velocities. Results suggest that by preferentially moving to the exterior of beds, M. edulis experiences higher dislodgement rates due to exposure to large hydrodynamic forces than do M. galloprovincialis. As a consequence of lower attachment strengths, M. edulis is also predicted to have higher mortality rates than M. galloprovincialis in interior portions of the bed. Thus, differential movement behavior may contribute to the differential genotype-specific mortality rates observed in the Mytilus spp. hybrid zone in southwest England, and is an example of behavior potentially modifying rates of exogenous selection in an intertidal hybrid zone.