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首页> 外文期刊>Estuarine Coastal and Shelf Science >Large brown seaweeds of the British Isles: Evidence of changes in abundance over four decades
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Large brown seaweeds of the British Isles: Evidence of changes in abundance over four decades

机译：英伦三岛的大型棕色海藻：四十年来丰度变化的证据

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The large brown seaweeds (macroalgae) are keystone species in intertidal and shallow subtidal marine ecosystems and are harvested for food and other products. Recently, there have been sporadic, often anecdotal, reports of local abundance declines around the British Isles, but regional surveys have rarely revisited sites to determine possible changes. An assessment was undertaken of changes in the abundance of large brown seaweeds around the British Isles using historical survey data, and determination of whether any changes were linked with climate change. Data were analysed from multiple surveys for 14 habitat-forming and commercially important species of Phaeophyceae, covering orders Laminariales, Fucales and Tilopteridales. Changes in abundance were assessed for sites over the period 1974-2010. Trends in distribution were compared to summer and winter sea surface temperatures (SST). Results revealed regional patterns of both increase and decrease in abundance for multiple species, with significant declines in the south for kelp species and increases in northern and central areas for some kelp and wracks. Abundance patterns of 10 of the 14 species showed a significant association with SSTs, but there was a mixture of positive and negative responses. This is the first British Isles-wide observation of declining abundance of large brown seaweeds. Historical surveys provide useful data to examine trends in abundance, but the ad hoc nature of these studies limit the conclusions that can be drawn. Although the British Isles remains a stronghold for large brown algae, it is imperative that systematic surveys are undertaken to monitor changes. (C) 2015 Elsevier Ltd. All rights reserved.
机译：大型棕色海藻（宏藻）是潮间带和浅潮带下海洋生态系统中的关键物种，被收获用作食品和其他产品。最近，有零星（通常是轶事）的报告，不列颠群岛周围的本地丰度下降，但是区域调查很少重新考虑确定可能变化的地点。利用历史调查数据，对不列颠群岛周围大型棕色海藻的丰度变化进行了评估，并确定是否有任何变化与气候变化有关。通过对14种生境形成和商业上重要的藻科物种的多次调查，对数据进行了分析，涵盖了海带，褐藻和鳞翅目。评估了1974-2010年期间站点的丰度变化。将分布趋势与夏季和冬季的海表温度（SST）进行了比较。结果显示，多个物种的丰度增加和减少的区域模式，海带物种在南部的显着下降，而某些海带和海藻在北部和中部地区则增加。 14个物种中有10个物种的丰度模式显示与SST显着相关，但存在阳性和阴性反应。这是不列颠群岛范围内首次出现的大型棕色海藻数量下降的观察。历史调查提供了有用的数据来检查数量的趋势，但是这些研究的特殊性质限制了可以得出的结论。尽管不列颠群岛仍然是大型褐藻的据点，但必须进行系统的调查以监测变化。 （C）2015 Elsevier Ltd.保留所有权利。

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