Similarity of rocky intertidal assemblages along the Pacific coast of Japan: effects of spatial scales and geographic distance
Similarity of rocky intertidal assemblages along the Pacific coast of Japan: effects of spatial scales and geographic distance
复制标题
DOI：
10.1007/s11284-005-0138-6
复制
发表时间：
2006-05-01
影响因子：
2
通讯作者：
Noda, Takashi
中科院分区：
文献类型：
--
作者：
Nakaoka, Masahiro;Ito, Norihiko;Noda, Takashi
影响群落结构的因素和过程在不同的空间和时间尺度上运作。我们使用嵌套的分层抽样设计分析了岩石潮间带组合的相似性在不同空间尺度上的变化。在日本太平洋沿岸 6 个地区（1,800 公里的海岸线）中选择的 5 个海岸的 5 个岩壁上，对由藻类、固着动物和活动动物组成的潮间带组合进行了普查。基于这种抽样设计，使用定性（存在/不存在）和定量（覆盖百分比和密度）数据计算组合的相似性，并在三个空间级别进行比较：（1）岩石级别（最精细的空间尺度，涵盖几到数百米），（2）海岸级别（中间空间尺度，涵盖几到数十公里），以及（3）区域级别（最广泛的空间尺度，涵盖数百到数千公里）。聚类分析表明，除了两个南部地区外，组合被分为不同的区域组，但它们并没有与每个海岸明显分开。对相似性的嵌套分析显示，区域之间以及每个区域内海岸之间的相似性存在显着差异，其中前者表现出更大的差异。相似性与区域层面的地理距离呈负相关，但在海岸或岩石层面则不然。在区域层面，随着距离的增加，移动动物的相似性下降得比固着生物更快。这些分析强调了大范围的非生物/生物因素（例如洋流条件和生物地理因素）在确定岩石潮间带组合相似性的观测模式方面的重要性。
Factors and processes affecting community structures operate at various spatial and temporal scales. We analyzed how similarities of rocky intertidal assemblages vary at different spatial scales using a nested, hierarchical sampling design. Intertidal assemblages consisting of algae, sessile animals, and mobile animals were censused on five rock walls at each of five shores chosen within each of six regions along the Pacific coast of Japan, encompassing 1,800 km of coastlines. Based on this sampling design, similarities in assemblages were calculated using both qualitative (presence/absence) and quantitative (percent cover and density) data, and compared at three spatial levels: (1) rock level (the finest spatial scale, encompassing several to hundreds of meters), (2) shore level (the intermediate spatial scale, encompassing several to tens of kilometers), and (3) region level (the broadest spatial scale, encompassing hundreds to thousands of kilometers). Cluster analysis showed that assemblages were categorized into distinct regional groups except for the two southern regions, but they did not separate clearly from each shore. A nested analysis of similarities revealed significant variation in similarities among regions and among shores within each region, with the former showing greater variation. Similarity was negatively correlated with geographic distance at the regional level but not at the shore or the rock levels. At the regional level, similarity decreased more rapidly with distance for mobile animals than sessile organisms. The analyses highlighted the importance of broad-scale abiotic/biotic factors such as oceanic current conditions and biogeographic factors in determining observed patterns in similarity of rocky intertidal assemblages.