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首页> 外文期刊>Journal of Fish Biology >Out of the pot and into the fire: Explaining the vulnerability of an endangered small headwater stream fish to black-bass Micropterus spp. invasion
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Out of the pot and into the fire: Explaining the vulnerability of an endangered small headwater stream fish to black-bass Micropterus spp. invasion

机译：从锅中进入火灾：解释濒临灭绝的小型散热鱼鱼到黑贝斯米多管SPP的脆弱性。 侵略

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摘要

Introduced predatory fishes have had consistently severe consequences for native fishes in stream environments around the world, although the drivers of these effects are often unclear. In the Swartkops River headwaters in South Africa, native Eastern Cape redfin Pseudobarbus afer were always absent from sites occupied by non-native black basses Micropterus salmoides and Micropterus dolomieu, but generally co-occurred with the native predators Anguilla marmorata and Anguilla mossambica. A natural experiment provided by flood-mediated recolonization of black-bass occupied sites by P. afer demonstrated depletion in black-bass invaded sites. Field behavioural observations of P. afer indicated that they foraged among benthic cover during the day, but suspended in open water at night. As the nocturnal A. marmorata and A. mossambica foraged actively within structural cover at night and M. dolomieu and M. salmoides are diurnal or crepuscular predators, P .afer is thus optimized to avoid predation by native anguillid predators and not the functionally unique predatory black basses. The integration of distributional, temporal population dynamics and behavioural data suggests that the severe effects of Micropterus spp. are probably a consequence of prey naivete and behaviour evolved to evade native predators.
机译：由于这些效果的驱动因素往往不清楚，所引入的掠夺性鱼类对世界各地的溪流环境中的土着鱼类始终是严重的后果。在南非的Swartkops河河道中，原住民东部的红鳍葡萄酒伪波巴斯一直缺乏非原生黑贝司Micropterus Salmoides和MicroPterus Dolomieu所占用的网站，但通常与原生捕食者Marmorata和Anguilla Mossambica共同发生。通过P. Bass overed地点的Blow-Bass被占领位点泛洪介导的黑啤占据部位提供的自然实验。 P. Afer的现场行为观测表明他们在白天底层覆盖中觅食，但晚上悬浮在露天水中。作为夜间A. Marmorata和A. Mossambica在晚上和M. Dolomieu和M. Salmoides中积极地在结构封面内积极觅食，因此P.Afer因此优化，以避免原生Anguillid捕食者的捕食，而不是功能独特的掠夺性黑贝斯。分配，时间种群动态和行为数据的整合表明MicroPterus SPP的严重影响。可能是猎物天真和行为的结果，以逃避本地掠食者。

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