Distribution patterns of meiofauna associated with a sublittoral Laminaria bed in the Cantabrian Sea (north-eastern Atlantic)
Distribution patterns of meiofauna associated with a sublittoral Laminaria bed in the Cantabrian Sea (north-eastern Atlantic)
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DOI：
10.1007/s00227-003-1191-8
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发表时间：
2004-02-01
期刊：
影响因子：
2.4
通讯作者：
Benito, J
中科院分区：
文献类型：
--
作者：
Arroyo, NL;Maldonado, M;Benito, J
本研究涉及小型底栖动物与位于西班牙北方海岸的海带海带Ochroleuca的亚沿海人口。在4年的时间内，每年一次的采样，我们研究了动物群的分布模式作为一些环境因素的功能在中尺度水平（深度，暴露于波浪和浪涌）。我们还研究了L. Ochroleuca丰度（以干重生物量和每个取样样方的植物数量表示）以及小型底栖生物的丰度和多样性。最后，我们调查了植物内的分布模式（藻类体与藻类固着器），也使用邻近底部的小型底栖动物作为参考，以估计在L.赭色白我们发现，大部分的永久小型底栖动物包括线虫，桡足类，螨，多毛类，tanaids和介形类，桡足类占主导地位的叶状体的线虫和线虫的holdfasts。临时小型底栖动物包括幼年端足类、双壳类和腹足类，以及藤壶无节幼体和Cyprids。小型底栖动物类群的丰度和主要组成与取样样方的深度和水动力暴露无关。然而，我们发现，作为微栖息地的函数，动物群存在显着的定性和定量差异。所有小型底栖动物组在固着样品中比在叶和底部样品中更丰富。底质样品中小型底栖生物的总分类组成与固着样品中的相似，但与与叶状体有关的小型底栖生物有很大不同。洛杉矶ochroleuca holdfasts，其中小型底栖生物的密集聚集，可以发生，似乎作为植物和岩石底部微生境之间的生态交错区的功能。总之，我们的研究结果表明，小型底栖动物的分布范围内的海带床主要是受影响的因素在微生境水平，而不是中尺度水平。
This study deals with meiofauna associated with a sublittoral population of the kelp Laminaria ochroleuca located on the northern coast of Spain. By sampling once a year over a 4-year period, we examined patterns of faunal distribution as a function of some environmental factors at the meso-scale level (depth, and exposure to waves and surge). We also examined the relationship between L. ochroleuca abundance (as dry weight biomass and number of plants per sampling quadrat) and abundance and diversity of meiofauna. Finally, we investigated patterns of within-plant distribution (algal frond vs. algal holdfast), using also the meiofauna of the adjacent bottom as a referent to estimate the level of 'phytal dependence' of the meiofauna collected on L. ochroleuca. We found that the bulk of permanent meiofauna consisted of nematodes, copepods, mites, polychaetes, tanaids and ostracods, with copepods being predominant on the fronds of the alga and nematodes in the holdfasts. The temporary meiofauna consisted of juvenile amphipods, bivalves and gastropods, together with barnacle nauplii and cyprids. Abundance and major composition of meiofaunal taxa were unrelated to both depth and hydrodynamic exposure of the sampling quadrats. However, we detected significant qualitative and quantitative faunal differences as a function of microhabitat. All meiofaunal groups were more abundant in holdfast samples than in frond and bottom samples. The gross taxonomic composition of meiofauna in bottom samples was similar to that in holdfast samples, but substantially different from that of meiofauna associated with the fronds. The L. ochroleuca holdfasts, in which dense aggregations of meiofauna can occur, appear to function as ecotone between phytal and rocky-bottom microhabitats. All together, our results suggest that the distribution of meiofauna within the Laminaria bed is mostly affected by factors operating at the microhabitat level rather than the meso-scale level.