Simplification of Caribbean reef-fish assemblages over decades of coral reef degradation.
Simplification of Caribbean reef-fish assemblages over decades of coral reef degradation.
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DOI：
10.1371/journal.pone.0126004
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发表时间：
2015
期刊：
影响因子：
3.7
通讯作者：
Côté IM
中科院分区：
文献类型：
--
作者：
Alvarez-Filip L;Paddack MJ;Collen B;Robertson DR;Côté IM
加勒比珊瑚礁的结构变得越来越简单，这主要是由于人类的影响。这一趋势对珊瑚礁相关群落的影响目前尚不清楚，但预计将是深远的。在这里，我们评估了几十年来珊瑚礁结构衰退期间鱼类组合的变化是否是非随机的。更具体地说，我们预测，与那些使用更广泛栖息地的物种（即栖息地通才）相比，完全依赖珊瑚礁栖息地的物种（即栖息地专家）应该处于劣势。通过分析 1980 年至 2006 年间调查的 161 种加勒比珊瑚礁鱼类的 3727 条丰度趋势，我们发现栖息地通才和栖息地专家的趋势存在显着差异。专家数量在 20 世纪 80 年代中期开始下降，到 20 世纪 90 年代中期降至 1980 年代基线的 60% 左右。自 2000 年代初期以来，专家数量的平均值和变化均有所增加，尽管平均值仍远低于 1980 年的基线水平。尽管没有明确的证据表明 2000 年代加勒比地区珊瑚礁栖息地质量出现区域性恢复，但还是出现了适度的恢复。相比之下，在这三十年里，综合性鱼类的数量保持相对稳定。很少有专门物种被捕捞，因此它们的数量下降很可能与栖息地退化有关。这些结果反映了在全球陆地分类群中观察到的通才取代专家的趋势。我们的研究结果带来的一个重大挑战是调查鱼类种群的这种群落层面的变化是否以及如何影响生态系统功能。
Caribbean coral reefs are becoming structurally simpler, largely due to human impacts. The consequences of this trend for reef-associated communities are currently unclear, but expected to be profound. Here, we assess whether changes in fish assemblages have been non-random over several decades of declining reef structure. More specifically, we predicted that species that depend exclusively on coral reef habitat (i.e., habitat specialists) should be at a disadvantage compared to those that use a broader array of habitats (i.e., habitat generalists). Analysing 3727 abundance trends of 161 Caribbean reef-fishes, surveyed between 1980 and 2006, we found that the trends of habitat-generalists and habitat-specialists differed markedly. The abundance of specialists started to decline in the mid-1980s, reaching a low of ~60% of the 1980 baseline by the mid-1990s. Both the average and the variation in abundance of specialists have increased since the early 2000s, although the average is still well below the baseline level of 1980. This modest recovery occurred despite no clear evidence of a regional recovery in coral reef habitat quality in the Caribbean during the 2000s. In contrast, the abundance of generalist fishes remained relatively stable over the same three decades. Few specialist species are fished, thus their population declines are most likely linked to habitat degradation. These results mirror the observed trends of replacement of specialists by generalists, observed in terrestrial taxa across the globe. A significant challenge that arises from our findings is now to investigate if, and how, such community-level changes in fish populations affect ecosystem function.
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影响因子：
5
作者：
Alvarez-Filip, Lorenzo;Dulvy, Nicholas K.;Gill, Jennifer A.
通讯作者：
Gill, Jennifer A.
DOI：
10.1098/rspb.2009.0339
发表时间：
2009-08-22
影响因子：
4.7
作者：
Alvarez-Filip, Lorenzo;Dulvy, Nicholas K.;Watkinson, Andrew R.
通讯作者：
Watkinson, Andrew R.
影响因子：
56.9
作者：
Butchart, Stuart H. M.;Walpole, Matt;Watson, Reg
通讯作者：
Watson, Reg
DOI：
10.1098/rstb.2011.0015
发表时间：
2011-09-12
影响因子：
6.3
作者：
Collen, Ben;McRae, Louise;Baillie, Jonathan E. M.
通讯作者：
Baillie, Jonathan E. M.
DOI：
10.1073/pnas.091092898
发表时间：
2001-05-08
影响因子：
11.1
作者：
Jackson, JBC
通讯作者：
Jackson, JBC