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首页> 外文期刊>Marine biology >Robustness In Life History Of The Brown Seaweed Ascophyllum Nodosum (fucales, Phaeophyceae) Across Large Scales: Effects Of Spatially And Temporally Induced Variability On Population Growth
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Robustness In Life History Of The Brown Seaweed Ascophyllum Nodosum (fucales, Phaeophyceae) Across Large Scales: Effects Of Spatially And Temporally Induced Variability On Population Growth

机译：大规模生活中褐海藻Ascophyllum Nodosum（山茱,、 Phaeophyceae）的生命史中的稳健性：时空变异对种群增长的影响

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Understanding the demography and function of biotope-forming seaweed species is of great importance for the conservation of the target species itself, as well as its associated organisms. The brown seaweed Ascophyllum nodosum is fundamental for the functioning of coastal marine ecosystems in the North Atlantic. In this study, we use a data-based size-classified matrix model to investigate the temporal and spatial variability in demography, and the environment-specific stochastic sensitivity and elasticity, of two A. nodosum populations, one in western Sweden and one on the Isle of Man in the Irish Sea. A significant difference between the two populations was that the Swedish population had comparably low and more variable stochastic population growth rate (λ_s). This pattern was partly explained by the relatively high and varying mortality rates during extreme ice-years in Sweden, and by the lower survival of small individuals during all years. There were also fewer large individuals in Sweden due to lower transitions to the larger size-classes and higher probability of shrinkage. Sensitivities were analogous in the two populations, and showed a high selection pressure for increased individual growth. Elasticities were also similar, with the exception that survival of the smallest individuals (i.e., transition a1,1), had a higher elasticity on the Isle of Man. Overall, the stochastic growth rate (λ_s) was most sensitive to proportional changes in loop- (i.e., survival within size-class) and, to some extent, growth-transitions in both study areas. These results show that structurally and demographically diverging A. nodosum populations may be similarly sensitive to changes in vital rates. This, in turn, indicates a plastic life history of A. nodosum that may cope with large environmental variability. The results further suggest that environmental change affecting the survival or growth of the larger, reproductive A. nodosum individuals could have severe and regional effects on the abundance and biomass of this species, with potential negative effects on the biodiversity of the associated communities.
机译：理解形成生物群落的海藻物种的人口统计学和功能对于保护目标物种本身及其相关生物至关重要。褐藻海藻Ascophyllum nodosum是北大西洋沿岸海洋生态系统功能的基础。在这项研究中，我们使用基于数据的大小分类矩阵模型，调查了两个A. nodosum种群的人口统计学在时间和空间上的变异性，以及环境特定的随机敏感性和弹性，其中一个在瑞典西部，另一个在瑞典西部。马恩岛在爱尔兰海。两种人口之间的显着差异是瑞典人口的随机人口增长率（λ_s）相对较低且变化较大。这种模式的部分原因是瑞典极端冰冻时期的死亡率相对较高且各不相同，以及所有年份小个体的存活率较低。瑞典的大型个体也有所减少，这是由于向大型个体的过渡较少，而收缩的可能性较高。两种人群的敏感性相似，显示出增加个体生长的高选择压力。弹性也很相似，除了最小的个体（即过渡a1,1）的生存在马恩岛上具有较高的弹性。总体而言，随机增长率（λ_s）对环的比例变化（即在大小分类内的生存率）以及两个研究区域的某种程度上的增长转变最为敏感。这些结果表明，结节曲霉种群在结构和人口上的差异可能对生命率的变化同样敏感。反过来，这表明结节曲霉的可塑性生活史可以应对较大的环境变化。结果进一步表明，环境变化会影响较大的生殖结节曲霉个体的生存或生长，可能对该物种的丰度和生物量产生严重和区域性影响，并对相关社区的生物多样性产生潜在的负面影响。

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