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Interhemispheric comparison of scale‐dependent spatial variation in the structure of intertidal rocky‐shore communities
Ecosphere ( IF 2.7 ) Pub Date : 2020-06-29 , DOI: 10.1002/ecs2.3068
Alexis M. Catalán 1, 2 , Nelson Valdivia 1, 3 , Ricardo A. Scrosati 4
Affiliation  

In rocky intertidal habitats, the pronounced increase in environmental stress with elevation, caused by tides, generates significant vertical variation in community structure. Along coastlines, environmental changes generate horizontal biological variation, which, when measured at large sampling intervals, generally surpasses vertical biological variation. It is unknown, however, how vertical biological variation compares with horizontal biological variation when the latter is measured in environmentally similar habitats. We tested the hypothesis that, for sites experiencing similar environmental conditions along the shore, horizontal biological variation does not surpass vertical biological variation even when horizontal variation is measured at large sampling intervals along the coast. We compared vertical and horizontal variation in intertidal communities by surveying habitats experiencing the same wave exposure on the NW Atlantic and SE Pacific coasts. We measured biological variation based on differences in species richness, occurrence, and abundance between quadrats from low and high elevations (vertical variation) and between quadrats at three horizontal scales of sampling interval on both coasts: local (tens of cm between quadrats), meso‐ (˜100 km between quadrats), and regional (˜200 km between quadrats). We measured biological variation for all species combined, separately for sessile and mobile species, and for the numerically dominant species. The data analyses indicated that horizontal biological variation was never higher than vertical biological variation, not even at the regional scale, providing support for our hypothesis. Overall, our findings suggest that studies comparing spatial scales of biological variation should consider the underlying environmental variation in addition to simply scale alone.

中文翻译:

潮间带岩岸群落结构中尺度相关的空间变化的半球间比较

在潮间带岩石生境中,潮汐引起的环境应力随海拔升高而显着增加,在群落结构中产生明显的垂直变化。沿海岸线,环境变化会产生水平的生物变化,以较大的采样间隔进行测量时,通常会超过垂直的生物变化。但是,在环境相似的生境中对水平生物变化进行测量时,如何将垂直生物变化与水平生物变化比较是未知的。我们测试了以下假设:对于沿海岸经历类似环境条件的站点,即使沿海岸以大采样间隔测量水平变化,水平生物变化也不会超过垂直生物变化。我们通过调查西北大西洋和东南太平洋沿岸经历相同波浪暴露的栖息地,比较了潮间带群落的垂直和水平变化。我们根据物种丰富度,发生率和低海拔和高海拔四方动物之间的物种丰度(垂直变化)以及两岸沿三个采样间隔水平水平的四方动物之间的差异来测量生物学变化:局部(四方动物之间数十厘米),中观‐(四方之间的距离约为100公里)和区域性(四方之间的距离约为200公里)。我们测量了所有物种组合的生物变异,分别针对无柄和活动物种以及数字优势物种。数据分析表明,水平生物变异永远不会高于垂直生物变异,甚至在区域范围内,为我们的假设提供支持。总体而言,我们的发现表明,比较生物变异的空间尺度的研究除了简单地单独尺度外,还应考虑潜在的环境变化。
更新日期:2020-06-29
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