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首页> 外文期刊>Marine ecology progress series >Nekton use of Ruppia maritima and non-vegetated bottom habitat types within brackish marsh ponds
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Nekton use of Ruppia maritima and non-vegetated bottom habitat types within brackish marsh ponds

机译：Nekton在微咸沼泽池塘中使用Ruppia maritima和非植被的底部生境类型

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ABSTRACT: Nekton (fishes and decapod crustaceans) use of brackish submerged aquatic vegetation (SAV) habitat has been largely overlooked in comparison to fresh and marine SAV habitats. This study was designed to examine nekton use of brackish marsh SAV habitat and non-vegetated bottom. Specifically, we examined the effects of habitat location (defined by SAV distance from marsh edge) and complexity (defined by SAV biomass) on nekton community density, biomass, and diversity in shallow water brackish marsh ponds, which contained monospecific beds of Ruppia maritima L. Three habitat types were investigated: (1) inner-pond SAV (SAV habitat 1 m from marsh edge), (2) near marsh-edge SAV (SAV habitat 1 m from marsh edge), and (3) non-vegetated bottom. We tested the null hypotheses that nekton density, biomass, and diversity were unrelated to habitat type or habitat characteristics. Ninety-six quantitative samples were taken with a 1 m2 throw trap between September 2001 and July 2002. Using multivariate analysis of variance (MANOVA), a significant habitat type by season interaction was found (Wilks’ λ = 0.32, F24,259 = 4.21, p 0.0001) for nekton density, biomass, and diversity. Simple linear regression showed a positive relationship between SAV and nekton biomass (p 0.0001); however, distance of the vegetated habitat from the marsh edge did not significantly influence SAV or nekton biomass. SAV biomass, but not location, appears to be a dominant factor that influences nekton use within these small brackish marsh ponds. This study highlights some of the intricacies associated with the identification and use of broad scale habitat classification for management purposes. Although brackish marsh SAV habitat types support higher densities of nekton compared to non-vegetated habitat, variation within this gross classification indicates a wide range of habitat ‘value’ that needs to be considered for management purposes.
机译：摘要：与新鲜和海洋SAV生境相比，Nekton（鱼类和十足纲甲壳类动物）对咸淡水生水生植物（SAV）生境的使用已被大大忽略。这项研究旨在检查微咸湿地SAV栖息地和非植被底部的nekton使用情况。具体而言，我们研究了栖息地位置（由距沼泽边缘的SAV距离定义）和复杂性（由SAV生物量定义）对浅水咸淡沼泽池塘中线虫群落密度，生物量和多样性的影响，咸水沼泽池塘中含有的单特异性床maripima L。研究了三种栖息地类型：（1）内塘SAV（SAV栖息地距沼泽边缘> 1 m），（2）近沼泽边缘SAV（SAV栖息地距沼泽边缘<1 m）和（3）无植被底部。我们检验了零假设，即肾脏密度，生物量和多样性与栖息地类型或栖息地特征无关。在2001年9月至2002年7月之间用1 m 2 投掷陷阱采集了96份定量样本。使用多元方差分析（MANOVA），发现了按季节相互作用的重要生境类型（Wilks'λ = 0.32， F 24,259 = 4.21，p <0.0001），以反映神经元密度，生物量和多样性。简单线性回归表明SAV与nekton生物量之间呈正相关（p <0.0001）;然而，植被栖息地与沼泽边缘的距离并没有显着影响SAV或尼克顿生物量。 SAV生物量（而不是位置）似乎是影响这些小咸淡沼泽池塘中尼康顿使用的主要因素。这项研究强调了与为管理目的而对大规模生境分类的识别和使用有关的一些复杂性。尽管与非植被生境相比，微咸沼泽SAV生境类型支持更高的猪笼草密度，但这种总体分类内的变化表明，出于管理目的，需要考虑广泛的生境“价值”。

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