Community level response to climate change: The long-term study of the fish and crustacean community of the Bristol Channel
Community level response to climate change: The long-term study of the fish and crustacean community of the Bristol Channel
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DOI：
10.1016/j.jembe.2011.02.028
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发表时间：
2011-04-30
影响因子：
2
通讯作者：
Somes, J. R.
中科院分区：
文献类型：
--
作者：
Henderson, P. A.;Seaby, R. M. H.;Somes, J. R.
据报道，英国萨默塞特郡欣克利角一项为期30年的鱼类和甲壳类动物丰度研究的结果。标准群落生态指标，包括年记录物种总数、α多样性和优势度指数、等级-丰度曲线和永久存在物种的组合，在研究期间均表现出显著的稳定性和无趋势。相比之下，群落结构呈现出明显的变化，这可能与许多物种的丰度呈现出长期趋势有关。在30个最丰富的物种中，有17个物种的原木丰度呈指数变化趋势，占总物种数量和生物量的99%以上。9种呈指数型增长，8种呈指数型下降。个别物种丰度的这种显著变化已被证明与海水温度、北大西洋涛动指数和盐度的变化有关。虽然年物种丰富度没有增加，但每月平均存在的物种数量有所增加。这是由季节变化引起的，夏秋季节的物种将它们的存在延伸到冬天。对于鱼类来说，优势物种没有表现出趋势，有人认为它们可能受到密度依赖的控制。可能是，虽然最丰富的物种受到资源的限制，但大多数不那么丰富的物种在动态上是不稳定的，更有可能对环境变化做出反应。(C) 2011 Elsevier B.V.版权所有
Results from a 30-year study of fish and crustacean abundance at Hinkley Point, Somerset, England are reported. Standard community ecology metrics, including annual total species number recorded, alpha diversity and dominance indices, the rank-abundance curve and the assemblage of permanently present species, have all shown notable stability and no trend over the study period. In contrast, community structure has shown clear change which can be related to the fact that the abundances of many species have shown long-term trends. Of the 30 most abundant species, which together comprise more than 99% of the total species number and biomass collected, 17 have shown a long-term trend in log abundance indicative of exponential change. 9 species have shown approximately exponential increases, and 8 exponential decreases in abundance. This remarkable variation in individual species' abundance has been shown for some species to be related to changes in sea water temperature, the North Atlantic Oscillation Index, and salinity. While annual species richness has not increased, the number of species present each month has, on average, increased. This has been caused by changes in seasonal presence, with summer-autumn species extending their presence further into the winter. For fish, the dominant species show no trend, and it is argued they are likely to be under density-dependent control. It may be that while the most abundant species are constrained by resources, the majority of less abundant forms are dynamically unstable and more likely to be responsive to environmental change. (C) 2011 Elsevier B.V. All rights reserved.