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首页> 外文期刊>Journal of phycology >DISTRIBUTION OF ALGAL EPIPHYTES ACROSS ENVIRONMENTAL GRADIENTS AT DIFFERENT SCALES: INTERTIDAL ELEVATION, HOST CANOPIES, AND HOST FRONDS
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DISTRIBUTION OF ALGAL EPIPHYTES ACROSS ENVIRONMENTAL GRADIENTS AT DIFFERENT SCALES: INTERTIDAL ELEVATION, HOST CANOPIES, AND HOST FRONDS

机译：在不同尺度上沿环境梯度分布的藻类表生：间断抬高，居冠和居前锋

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摘要

Understanding epiphyte distribution in coastal communities is important because these organisms affect many others directly or indirectly. Yet, their distribution has been considerably less studied than that of their hosts and other primary-space holders. Identifying major sources of variation in epiphyte abundance is thus still a need. Environmental gradients help predict species distribution and are pervasive on marine shores. In this study, we test the notion that environmental gradients across intertidal elevation, throughout host canopies, and along host fronds explain a large variation in the abundance of sympatric epiphytes. Our model system was the assemblage of Ascophyllum nodosum (L.) Le Jol. and its epiphytes Vertebrata lanosa (L.) T. A. Chr. [= Polysiphonia lanosa (L.) Tandy], Elachista fucicola (Velley) Aresch., and Pylaiella littoralis (L.) Kjellm. On the coast of Nova Scotia (Canada), we found evidence of a spatial segregation among these species at almost all scales. While the red epiphyte V. lanosa was more common at high- and midintertidal elevations (peaking at midelevations) and on middle segments of host fronds, the brown epiphytes E. fucicola and P. littoralis were more common at low elevations and restricted to distal segments of host fronds. Canopy habitat affected abundance only for V. lanosa, which was more common within the host canopy than on its periphery at midelevations. Since the studied gradients are related to predictable changes in abiotic factors, the identification of likely causes behind the observed patterns was facilitated. Our study ends by proposing abiotic and biotic factors that deserve priority in the experimental testing of the forces structuring this assemblage.
机译：了解沿海社区附生植物的分布很重要，因为这些生物直接或间接影响许多其他生物。但是，与它们的主机和其他主要空间所有者的分布相比，对它们的分布的研究少得多。因此，仍然需要确定附生植物丰度变化的主要来源。环境梯度有助于预测物种分布，并且在海洋海岸无处不在。在这项研究中，我们测试了潮间带海拔，整个宿主冠层以及沿着宿主叶片的环境梯度解释了同伴附生植物丰度的巨大变化的观点。我们的模型系统是Nocosum（L.）Le Jol的组合。及其附生植物Vertebrata lanosa（L.）T. A. Chr。 [= Polysiphonia lanosa（L.）Tandy]，Elachista fucicola（Velley）Aresch。和Pylaiella littoralis（L.）Kjellm。在新斯科舍省（加拿大）海岸，我们发现了几乎所有尺度下这些物种之间空间隔离的证据。红色的附生植物V. lanosa在潮间带高潮和中潮高处（在中部升高时出现）以及寄主叶的中段更为常见，而棕色的附生植物E. fucicola和P. littoralis在低海拔时更常见，并且局限于远端主机叶。冠层栖息地仅影响V. lanosa的丰度，该种在寄主冠层内比在中部海拔周围更常见。由于研究的梯度与非生物因子的可预测变化有关，因此便于识别观察到的模式背后的可能原因。我们的研究以提出非生物和生物因素作为结尾，这些非生物和生物因素在构成这种组合的力的实验测试中值得优先考虑。

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