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Long term changes in the status of coastal fish in the Baltic Sea

机译：波罗的海沿海鱼类状况的长期变化

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Management for sustainable coastal ecosystems is benefited by coherent large scale status assessments to support the identification of measures, but these efforts may be challenged by both data availability and natural biogeographical variation. Coastal fish are a resource for commercial and recreational fisheries as well as significant contributors to coastal ecosystem functioning, by linking lower and higher levels of the food web. This study addresses long term changes in coastal fish communities at Baltic Sea regional scale, in order to identify overall trends and support the operationalization of large scale status assessments of marine biota. The study was focused on two indicators representing the functional groups of Piscivores, which are attributed to changes in food web processes including predation/fisheries, and Cyprinids, which are associated with eutrophication. The indicators were assessed for trends within ten-year intervals, using data combined from national monitoring programs during 1991-2013. The results showed predominantly declining trends in Piscivores and of increases in Cyprinids during the studied three decades, both indicative of a deteriorating status. The pattern was however reversed in the most recent years. Similar results among adjacent areas were identified in some cases, but overall differences at local scale were high, indicating strong influence of local processes. The results suggest that coordinated local measures in order to abate cumulative effects are a preferred way of improving the overall status of coastal fish. The latest studied time intervals were the overall most stable and could be considered as potential baseline years for upcoming regional assessments. (C) 2015 Elsevier Ltd. All rights reserved.
机译：可持续的沿海生态系统的管理得益于连贯的大规模状况评估，以支持对措施的确定，但这些努力可能受到数据可用性和自然生物地理变化的挑战。沿海鱼类是商业和休闲渔业的资源，也是通过将较低和较高水平的食物网联系起来而成为沿海生态系统功能的重要因素。这项研究解决了波罗的海区域尺度上沿海鱼类群落的长期变化，以便确定总体趋势并支持对海洋生物群的大规模状况评估的实施。该研究集中在代表食肉动物功能组的两个指标上，这两个指标归因于食物网络过程的变化，包括捕食/渔业和鲤科鱼，它们与富营养化有关。使用1991-2013年期间国家监测计划的数据，对指标在十年间隔内的趋势进行了评估。结果表明，在研究的三十年中，食肉动物的趋势呈下降趋势，鲤鱼的呈上升趋势，两者均表明状况正在恶化。但是，这种情况在最近几年已经逆转。在某些情况下，相邻区域之间的结果相似，但局部范围的总体差异很大，表明局部过程的影响很大。结果表明，采取协调一致的地方措施以减轻累积影响是改善沿海鱼类总体状况的首选方法。最近研究的时间间隔总体上最稳定，可以被视为即将进行的区域评估的潜在基准年。 （C）2015 Elsevier Ltd.保留所有权利。

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