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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Temporal variation in intertidal habitat use by nekton at seasonal and diel scales
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Temporal variation in intertidal habitat use by nekton at seasonal and diel scales

机译：Nekton在季节性和DIEL尺度的跨营栖息地使用的时间变异

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Structure provided by temperate seagrasses is expected to reduce encounter rates with predators and therefore benefit small nekton most in summer, when predation is intense and seagrass reaches peak biomass, and in the day relative to night, when darkness limits visually-oriented predators regardless of habitat. Based on seines in eelgrass (Zostera marina), unvegetated habitat, and edges in Willapa Bay, Washington, USA, nekton abundances varied across habitats and on both diel and seasonal time scales, yet only a few time-by-habitat interactions were observed, in which habitat distinctions were most pronounced at certain times. One explanation is that four of the six most abundant species disproportionately occupied unvegetated habitat or were habitat generalists, but our expectations were based on eelgrass-associated taxa. Multivariate community structure responded separately to season, habitat, and diet period, in order of importance. Total abundance showed a significant season-by-habitat interaction. A summer peak in vegetated habitats was largely driven by shiner perch and sticklebacks, two eelgrass-associated fishes, while unvegetated habitat showed year-round uniform abundances due to taxa like English sole and sand shrimp with winter and spring peaks, and no strong habitat associations or association with unvegetated habitat, respectively. In a single diel-by-habitat interaction, shiner perch were eelgrass-associated during the day but not at night. No evidence emerged of differences in body size across habitats for any species measured, but many taxa grew seasonally, likely as cohorts migrating out of the estuary. Seasonality was thus the strongest signal governing patterns of community structure, abundance, and body size across time and space, while habitat structure and diel period were less important. Our results are largely consistent with the other studies showing the primacy of seasonality in structuring estuarine nekton communities, but also show that this pattern is highly dependent on the seasonal recruitment patterns and habitat associations of abundant nekton.
机译：温带海草提供的结构预计将减少与捕食者的遭遇率，因此在夏季大多数较小的奈基尔顿，当捕食是激烈的，海草达到峰生物量，当黑暗限制视觉上的掠食者时，无论栖息地，当黑暗限制在视觉上的捕食者时。基于eelgrass（Zostera Marina）的塞内山，劳拉湾，华盛顿，美国华盛顿湾的边缘，尼克顿丰富在栖息地和DIEL和季节性时间尺度上变化，但只观察到几个习惯的互动，在某些时候栖息地区分最明显。一种解释是，六种最丰富的四种物种中有四种不成比例地占据了栖息地或栖息地是栖息地，但我们的期望是基于鳗草相关的分类群。多元群落结构分别回应季节，栖息地和饮食期，以重要性。总丰富显示出了重要的季节性互动。植物栖息地的夏季峰值在很大程度上由闪亮鲈鱼和汗衫，两个鳗鱼相关的鱼类驱动，而植物栖息地由于英国唯一和春季峰，而且没有强有力的栖息地展示了冬季唯一和沙虾，而且没有强大的栖息地的栖息地表现出全年均匀的丰富。或与尚未公开的栖息地联系。在单一的逐个栖息地相互作用中，闪电鲈鱼在白天鳗鱼相关，但在晚上没有。没有证据表明任何测量的任何物种的栖息地患有身体大小的差异，但许多分类群季节性速度越来越多，可能是围攻河口的队列。因此，季节性是社区结构，丰富和体积的最强烈信号，跨越时空，而栖息地结构和DIEL期不太重要。我们的结果主要符合其他研究，展示了构建河口尼克尔顿社区的季节性的首要研究，而且表明这种模式高度依赖于丰富的尼克顿季节性招聘模式和栖息地协会。

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