Department of Ichthyology and Fisheries Science, Rhodes University, Grahamstown, South Africa.
Glob Chang Biol. 2014 Sep;20(9):2765-77. doi: 10.1111/gcb.12612. Epub 2014 Jun 21.
Despite increasing awareness of large-scale climate-driven distribution shifts in the marine environment, no study has linked rapid ocean warming to a shift in distribution and consequent hybridization of a marine fish species. This study describes rapid warming (0.8 °C per decade) in the coastal waters of the Angola-Benguela Frontal Zone over the last three decades and a concomitant shift by a temperature sensitive coastal fish species (Argyrosomus coronus) southward from Angola into Namibia. In this context, rapid shifts in distribution across Economic Exclusive Zones will complicate the management of fishes, particularly when there is a lack of congruence in the fisheries policy between nations. Evidence for recent hybridization between A. coronus and a congener, A. inodorus, indicate that the rapid shift in distribution of A. coronus has placed adults of the two species in contact during their spawning events. Ocean warming may therefore revert established species isolation mechanisms and alter the evolutionary history of fishes. While the consequences of the hybridization on the production of the resource remain unclear, this will most likely introduce additional layers of complexity to their management.
尽管人们越来越意识到海洋环境中大规模气候驱动的分布转移，但没有研究将海洋快速变暖与一种海洋鱼类的分布转移和随之而来的杂交联系起来。本研究描述了过去三十年安哥拉-本格拉锋区沿海水域的快速变暖（每十年 0.8°C），以及一种对温度敏感的沿海鱼类（Argyrosomus coronus）从安哥拉向南迁移到纳米比亚。在这种情况下，经济专属区（EEZ）内分布的快速变化将使鱼类管理变得复杂，特别是在各国渔业政策缺乏一致性的情况下。A. coronus 和 A. inodorus 之间最近杂交的证据表明，A. coronus 的快速分布转移使两个物种的成年个体在产卵期间接触。因此，海洋变暖可能会使已建立的物种隔离机制失效，并改变鱼类的进化历史。虽然杂交对资源产量的影响尚不清楚，但这很可能会给它们的管理增加更多的复杂性。
