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首页> 外文会议>Annual Meeting of the American Fisheries Society >Fish Assemblage Structure in Relation to Multiple Stressors along the Saint John River, New Brunswick, Canada
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Fish Assemblage Structure in Relation to Multiple Stressors along the Saint John River, New Brunswick, Canada

机译：沿着圣约翰河，加拿大新不伦瑞克河的多重压力源的鱼组合结构

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The Saint John River is located on the mainland of eastern North America, forming in northern Maine—southeastern Quebec, and flows east and south through New Brunswick. Fish collections were conducted at sites located from 135 to 625 km above the mouth in 2000 and 2001. Methods development trials demonstrated that the highest success was achieved with a standardized netting protocol consisting of a combination of dusk seining, nighttime electrofishing, and short-term gill net sets. A total of 36 species of fish were collected, with the greatest diversity occurring at the farthest downstream site. Upstream migration of anadromous species is restricted by the absence or poor performance of fish passage facilities at the five hydroelectric dams alongthe river system. The downstream migration of introduced muskellunge Esox masquinongy and upstream range expansions of introduced smallmouth bass Micropterus dolomieu and rainbow trout Oncorhynchus mykiss were observed. Fish species and abundances variedalong the river, but the cumulative effects of human activities were not easily identified within the fish assemblage. There may have been a critical threshold within the fish assemblage defined by an accumulation of 20 anthropogenic developments. Cyprinid species declined in abundance and yellow perch Perca flavescens and brown bullhead Ameiurus nebulosus increased in abundance downstream of this apparent threshold.
机译：圣约翰河位于北美东部大陆，在魁北克北部北部北部，并通过新的布伦瑞克流动东部和南方。在2000年和2001年，在嘴前的地点占地面积135至625公里的地点进行了。方法，开发试验表明，采用标准化的网路协议，由黄昏地区，夜间电捕捞和短期组成的标准网协议实现了最高的成功Gill网集。总共收集了36种鱼类，最远的下游现场发生了最大的多样性。沿着河流系统的五个水力电压器的鱼通设施的缺失或差的性能的缺失或差的性能受到限制的上游迁移。介绍了Muskellunge Esox Masquinongy和上游范围扩展的下游迁移介绍的小型低音Micropterus Dolomieu和Rainbow Trout Oncorhynchus Mykiss的扩展。鱼类和丰富的河流variedalong河流，但在鱼组合中不容易识别人类活动的累积效果。通过累积20个人类发育的鱼组合中可能存在临界阈值。鲤鱼种类在丰度和黄色鲈鱼Percescens和Brown Bullhead Ameiurus Nebulosus中下降，在这种表观阈值下游增加了丰富。

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