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首页> 外文期刊>Marine biology >Distribution of a marginal population of Mytilus edulis: responses to biotic and abiotic processes at different spatial scales
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Distribution of a marginal population of Mytilus edulis: responses to biotic and abiotic processes at different spatial scales

机译：食用菌边缘种群的分布：在不同空间尺度上对生物和非生物过程的响应

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摘要

Physical and biological processes interact to produce pattern in nature. Pattern is scale dependent as processes generating pattern are heterogeneous in time and space. We tested some causes of variation in abundance and distribution of three marginal populations of sublittoral blue mussels, Mytilus edulis, in the non-tidal northeastern Baltic Sea. We studied the role of substrate inclination, perennial algae and siltation along local wave exposure gradients on mussel distribution over a regional salinity gradient. We found marked differences on regional scales (p < 0.001) with lower densities and biomasses of mussels with declining salinity. Along local gradients, mussel densities increased with increasing exposure (p < 0.001) and declining slope and sedimentation (p < 0.01). Site specifically, densities of blue mussels and the perennial red algae, Furcellaria lumbricalis, were positively related, results supported by a colonisation experiment. Also, young post-recruits showed significant relations to adult biomass, wave exposure, algal biomass, bottom slope and sediment cover. Findings showed that the relative importance of the determinants affecting blue mussels at the edge of their range vary with scale and are affected by the density and size structure of mussel populations. The study provides an indication of the types of factors that may be invoked as causes of spatial variation in marginal blue mussel populations and reinforces the need to consider multiple aspects when distributional patterns are assessed.
机译：物理和生物过程相互作用以产生自然形态。模式是与比例相关的，因为生成模式的过程在时间和空间上是异构的。我们测试了非潮汐东北波罗的海沿岸亚蓝贻贝的三个边缘种群（蓝藻）的丰度和分布变化的一些原因。我们研究了底物倾角，多年生藻类和淤积沿局部波暴露梯度对贻贝分布在区域盐度梯度上的作用。我们发现，盐度下降的贻贝密度和生物量较低时，区域尺度存在显着差异（p <0.001）。沿局部梯度，贻贝密度随着暴露量的增加（p <0.001）以及坡度和沉积物的下降（p <0.01）而增加。具体而言，定居实验支持蓝贻贝和多年生红藻Furcellaria lumbricalis的密度呈正相关。此外，年轻的新兵也与成年生物量，波浪暴露，藻类生物量，底坡和沉积物覆盖率有显着关系。研究结果表明，影响蓝贻贝的决定因素在其范围边缘的相对重要性随规模而变化，并受贻贝种群的密度和大小结构影响。这项研究提供了可能被认为是边缘蓝贻贝种群空间变化原因的因素类型的指示，并加强了在评估分布格局时需要考虑多个方面的需求。

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