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首页> 外文期刊>The Progressive Fish-Culturist >EFFECTIVENESS OF ALARM-DISTRESS CALLS FOR FRIGHTENING HERONS FROM A FISH REARING FACILITY
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EFFECTIVENESS OF ALARM-DISTRESS CALLS FOR FRIGHTENING HERONS FROM A FISH REARING FACILITY

机译：养鱼场吓苍鹭的预警电话的功效

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摘要

We evaluated the effectiveness of using alarm-distress calls of the black-crowned night heron Nycticorax nycticorax and the great blue heron Ardea herodias for frightening these piscivorous bird species from a rearing unit for rainbow trout Oncorhynchus mykiss. Heron alarm-distress calls reduced black-crowned night heron numbers 48% during the 11-d treatment period, compared with the pretreatment period, but did not affect the number of great blue herons. The number of black-crowned night herons using the rearing unit and the proportion that remained immediately after the broadcast of alarm-distress calls increased from nights 1 through 11 of the treatment period, which indicates that this predator quickly habituated to the calls. We did not find any differences between the proportions of black-crowned night herons and great blue herons that remained on the rearing unit immediately after playing calls of the respective species. Alarm-distress calls were mostly ineffective in reducing heron predation on rainbow trout fingerlings.
机译：我们评估了使用黑冠夜鹭Nycticorax nycticorax和大蓝鹭Ardea herodias的求救信号来吓from彩虹鳟鱼Oncorhynchus mykiss饲养单元中的这些食鱼鸟类的功效。与治疗前相比，在11天治疗期间，苍鹭的警报遇险电话使黑冠夜鹭的数量减少了48％，但并未影响大蓝鹭的数量。从治疗期的第1夜到第11夜，使用饲养单元的黑冠夜鹭的数量和在广播遇险呼叫后立即保留的比例有所增加，这表明该捕食者很快适应了这些呼叫。我们没有发现黑冠夜鹭和大蓝鹭的比例在打完相应物种后立即留在饲养单元上的任何差异。报警求救电话在减少虹鳟鱼种上的鹭类捕食方面大多无效。

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