Long-term changes in deep-water fish populations in the northeast Atlantic: a deeper reaching effect of fisheries?
Long-term changes in deep-water fish populations in the northeast Atlantic: a deeper reaching effect of fisheries?
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DOI：
10.1098/rspb.2009.0098
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发表时间：
2009-06-07
影响因子：
4.7
通讯作者：
Priede, I. G.
中科院分区：
文献类型：
--
作者：
Bailey, D. M.;Collins, M. A.;Priede, I. G.
深水鱼类的生活史和种群数据严重缺乏是成功管理渔业的主要障碍。关于非目标物种和生活在渔场深处的物种的长期数据尤其罕见。我们分析了1977年至1989年和1997年至2002年在800至4800米深度进行的科学拖网的独特数据集。在此期间，在800至2500米的所有深度，鱼类的总体丰度显著下降，远高于商业捕鱼的最大深度（约2500米）。1600米)。其活动范围至少部分落在捕捞深度范围内的物种，其丰度变化明显更大，而且似乎与任何自然因素（如来自水面的通量变化或潜在猎物的丰度）不一致。如果观察到的丰度下降是由于捕鱼，那么它的影响现在延伸到较低的深海区，导致以前认为不受影响的地区的数量下降。一个可能的机制是对鱼类范围的浅层部分的影响，导致其范围较低部分的丰度下降。这一意想不到的现象对渔业和海洋保护区的管理产生了重要的影响，因为这表明渔业的影响可以转移到既不经常监测也不被视为管理渔区一部分的深近海地区。
A severe scarcity of life history and population data for deep-water fishes is a major impediment to successful fisheries management. Long-term data for non-target species and those living deeper than the fishing grounds are particularly rare. We analysed a unique dataset of scientific trawls made from 1977 to 1989 and from 1997 to 2002, at depths from 800 to 4800 m. Over this time, overall fish abundance fell significantly at all depths from 800 to 2500 m, considerably deeper than the maximum depth of commercial fishing (approx. 1600 m). Changes in abundance were significantly larger in species whose ranges fell at least partly within fished depths and did not appear to be consistent with any natural factors such as changes in fluxes from the surface or the abundance of potential prey. If the observed decreases in abundance are due to fishing, then its effects now extend into the lower bathyal zone, resulting in declines in areas that have been previously thought to be unaffected. A possible mechanism is impacts on the shallow parts of the ranges of fish species, resulting in declines in abundance in the lower parts of their ranges. This unexpected phenomenon has important consequences for fisheries and marine reserve management, as this would indicate that the impacts of fisheries can be transmitted into deep offshore areas that are neither routinely monitored nor considered as part of the managed fishery areas.