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首页> 外文期刊>Marine biology >Tidal height, rather than habitat selection for conspecifics, controls settlement in mussels
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Tidal height, rather than habitat selection for conspecifics, controls settlement in mussels

机译：潮汐高度控制着贻贝的定居，而不是针对特定物种选择栖息地

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Settlement is a major determinant of intertidal populations. However, the energy costs of lost larvae are very high. Accordingly, arrival and attachment on suitable substrata are essential requirements for species' survival. On the intertidal, the presence of cues left by adult or juvenile conspecifics could be vital for the successful establishment of larvae arriving on the shore. Two mussel species, the indigenous Perna perna and the invasive Mytilus gallo-provincialis, co-occur on the lower eulittoral zone on the south coast of South Africa. P.perna dominates the low and M. galloprovincialis the high mussel zones, with co-existence in the mid mussel zone. This study tested the hypothesis of settlement selectivity for conspecifics in these two mussel species, to understand whether the final adult distribution of mussels on the shores is determined by active behavioural and chemical mechanisms. Preferential selection by larvae for conspecifics was tested in the field during the peak settlement period in 2004 in natural mussel beds across zones and through manipulative experiments in the mid-zone where the species co-exist. On natural beds, settlement was determined by counts of settlers attached over 48 h onto artificial collectors. Collectors were placed on beds of P. perna and M. galloprovincialis present at bothrnhigh- and low-adult densities, as well as in mixed beds. On such natural beds, settlers of both species consistently favored low-zone P. perna beds. Settlement patterns over 24 h onto experimentally created mussel patches consisting of P. perna, M. galloprovincialis or the two species combined beds, set in the mixed zone, did not conform with the results of the natural beds study: settlers of both species settled with no discrimination among different patches. The results indicate that mussels, which are sedentary, lack attraction to conspecifics at settlement. This highlights the importance of tidal height in setting settlement rates, and of post-settlement events in shaping populations of these broadcast spawners.
机译：定居是潮间带人口的主要决定因素。然而，失去幼虫的能量成本非常高。因此，到达和附着在合适的基质上是物种生存的基本要求。在潮间带，成年或幼体的幼体留下的线索对于成功地建立到达岸上的幼虫可能至关重要。两种贻贝物种是本土的Perna perna和侵入性的Mytilus gallo-provincialis，共产于南非南海岸的下部离岸区。贻贝在低贻贝地区占主导地位，而贻贝在高贻贝地区占主导地位，贻贝中部地区并存。这项研究测试了这两种贻贝物种对特定物种的定居选择性的假设，以了解贻贝在海岸上的最终成年分布是否由活跃的行为和化学机制决定。 2004年，在高峰沉降期间，在跨区域的天然贻贝河床中，并通过在该物种共存的中部区域进行的操纵性实验，在田间测试了幼虫对特定物种的优先选择。在天然床上，沉降是通过在48小时内附着在人工收集器上的沉降器的数量确定的。将收集器放置在高，低成人密度以及混合床中存在的P. perna和M. galloprovincialis床上。在这样的天然床上，这两个物种的定居者一直偏爱低地带的伯氏疟原虫床。在24小时内，在实验区上创建的贻贝斑块上的沉降模式，由贻贝假单胞菌，加勒莫氏疟原虫或两个物种混合床组成，位于混合区，与自然床研究结果不符：两种物种的定居者均以不区分不同补丁。结果表明，久坐的贻贝在定居时对特定物种没有吸引力。这凸显了潮高在设定沉降率中的重要性，以及在沉降后事件对塑造这些广播产卵种群的重要性。

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