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首页> 外文期刊>Estuarine Coastal and Shelf Science >Fine-scale spatial patterns in the demersal fish and invertebrate community in a northwest Atlantic ecosystem
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Fine-scale spatial patterns in the demersal fish and invertebrate community in a northwest Atlantic ecosystem

机译：西北大西洋生态系统中深海鱼类和无脊椎动物群落的精细尺度空间格局

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The abundance, biomass, diversity, and species composition of the demersal fish and invertebrate community in Rhode Island Sound and Block Island Sound, an area identified for offshore renewable energy development, were evaluated for spatial and seasonal structure. We conducted 58 otter trawls and 51 beam trawls in the spring, summer and fall of 2009-2012, and incorporated additional data from 88 otter trawls conducted by the Northeast Area Monitoring and Assessment Program. We used regionally-grouped abundance, biomass, diversity, and size spectra to assess spatial patterns in the aggregate fish community, and hierarchical cluster analysis to evaluate trends in species assemblages. Our analyses revealed coherent gradients in fish community biomass, diversity and species composition extending from inshore to offshore waters, as well as patterns related to the differing bathymetry of Rhode Island and Block Island Sounds. The fish communities around Block Island and Cox's Ledge are particularly diverse, suggesting that the proximity of hard bottom habitat may be important in structuring fish communities in this area. Species assemblages in Rhode Island and Block Island Sounds are characterized by a combination of piscivores (silver hake, summer flounder, spiny dogfish), benthivores (American lobster, black sea bass, Leucoraja spp. skates, scup) and planktivores (sea scallop), and exhibit geographic patterns that are persistent from year to year, yet variable by season. Such distributions reflect the cross-shelf migration of fish and invertebrate species in the spring and fall, highlighting the importance of considering seasonal fish behavior when planning construction schedules for offshore development projects. The fine spatial scale (10 s of kms) of this research makes it especially valuable for local marine spatial planning efforts by identifying local-scale patterns in fish community structure that will enable future assessment of the ecological impacts of offshore development. As such, this knowledge of the spatial and temporal structure of the demersal fish community in Rhode Island and Block Island Sounds will help to guide the placement of offshore structures so as to preserve the ecological and economic value of the area.
机译：对罗德岛湾和布洛克岛湾（被确定为海上可再生能源开发区域）的海底鱼类和无脊椎动物群落的丰度，生物量，多样性和物种组成进行了空间和季节结构评估。在2009-2012年春季，夏季和秋季，我们进行了58只水獭拖网和51根束网拖网，并纳入了东北地区监测与评估计划进行的88只水獭拖网的补充数据。我们使用区域分组的丰度，生物量，多样性和大小光谱来评估聚集鱼类群落中的空间格局，并使用层次聚类分析来评估物种集合的趋势。我们的分析揭示了鱼类群落生物量，多样性和物种组成从近海延伸到近海的连贯梯度，以及与罗得岛和布洛克岛海峡的不同测深法有关的模式。布洛克岛（Block Island）和考克斯壁架（Cox's Ledge）周围的鱼类群落特别多样，这表明硬底栖息地的邻近性可能对构建该地区的鱼类群落至关重要。罗德岛湾和布洛克岛湾的物种组合的特征是食肉动物（银色无须鳕，夏季比目鱼，多刺的fish鱼），底栖动物（美国龙虾，黑鲈鱼，Leucoraja spp。溜冰鞋，瓢）和浮游动物（扇贝），并显示出每年都持续存在但随季节而变化的地理模式。这种分布反映了春季和秋季鱼类和无脊椎动物物种的跨架迁移，从而突出了在规划离岸开发项目的施工时间表时考虑季节性鱼类行为的重要性。这项研究的精细空间尺度（10 s kms），通过识别鱼类群落结构中的局部尺度模式（对于未来评估离岸开发的生态影响），对于当地海洋空间规划工作尤其有价值。因此，对罗得岛和布洛克岛海底鱼类鱼类群落的时空结构的了解将有助于指导近海结构的放置，从而保留该地区的生态和经济价值。

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