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首页> 外文期刊>Journal of great lakes research >Cercopagis pengoi as a New Prey Item for Alewife (Alosa pseudoharengus) and Rainbow Smelt (Osmerus mordax) in Lake Ontario
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Cercopagis pengoi as a New Prey Item for Alewife (Alosa pseudoharengus) and Rainbow Smelt (Osmerus mordax) in Lake Ontario

机译：Cercopagis pengoi作为安大略湖的Alewife（Alosa pseudoharengus）和Rainbow Smelt（Osmerus mordax）的新猎物

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摘要

Diets of alewife (Alosa pseudoharengus) and rainbow smelt (Osmerus mordax) were examined before (1997) and after (1998 and 1999) the establishment of the predatory cladoceran Cercopagis pengoi in Lake Ontario. Cercopagis pengoi was absent in both fish stomachs and zooplankton samples in 1997, but by August 1998, its distribution was lake-wide and spines of this organism were present in stomachs of both fish species. Incidence of C. pengoi spines was highest in adult alewives. Spines occurred in 72, 100, and 90% of stomachs in August 1998, August 1999, and October 1999, respectively. Spines were found in 15 and 53% of YOY alewife stomachs in August 1998 and October 1999, respectively. Cercopagis pengoi spines were least common in rainbow smelt stomachs (12% in August 1998 and 6% in October 1999). Low frequency of occurrence in rainbow smelt likely resulted from limited spatial overlap with C. pengoi. No C. pengoi spines were found in alewives < 66 mm total length (TL) which suggests that consumption of C. pengoi by YOY alewife is limited by the long caudal spine. Low consumption of C. pengoi by YOY alewife may explain the remarkably rapid population increase of C. pengoi in Lake Ontario in 1998 in the presence of a strong alewife year class. These results indicate that C. pengoi is a competitor of YOY alewives for zooplankton during the summer but also a potential prey item for larger fish throughout the year and for YOY alewife in the fall.
机译：在安大略湖建立掠食性枝角类对虾Cercopagis pengoi之前（1997年）和之后（1998年和1999年），对alewife（Alosa pseudoharengus）和彩虹味（Osmerus mordax）的饮食进行了检查。 1997年，鱼胃和浮游动物样本中均不存在刚果金龟子，但到1998年8月，其分布在整个湖中，并且两种鱼的胃中都存在这种生物的棘突。在成年虾中，C。pengoi刺的发病率最高。在1998年8月，1999年8月和1999年10月，分别在72％，100％和90％的胃中出现了棘刺。在1998年8月和1999年10月，分别在15％和53％的年青人肚脐胃中发现了刺。在彩虹熔炼的胃中，Cercopagis pengoi刺最不常见（1998年8月为12％，1999年10月为6％）。彩虹熔炼的发生频率较低可能是由于与企鹅果的空间重叠有限。在总长度小于66毫米（TL）的虾类中未发现任何C. pengoi棘突，这表明YOY alewife食用C. pengoi受到长尾椎的限制。 YOY alewife的C. pengoi消费量低，可以解释1998年安大略湖中存在大量alewife年级的情况下，C。pengoi的人口迅速增加。这些结果表明，C。pengoi是夏季浮游动物的YOY副主角的竞争对手，但在全年还是秋季较大鱼和YOY alewife的潜在猎物。

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