诺伊齐德勒湖欧飘和欧白鱼之间的食物资源分配

欧飘和欧白鱼是奥地利诺伊齐德勒湖敝水区的两优势种。本文研究了１９９４年６月至１１月间欧飘和欧白鱼之间的食物资源分配。从６月到９月，欧飘和欧白鱼主食枝角类蒙古秀体溲和透明薄皮溲，生态位重叠度高，在１０月和１１月，欧飘主食桡足类刺北镖水蚤和昆虫，而欧白鱼转移到主食昆虫，生态位重叠降低，食物分配明显。

Resource partitioning between cyprinids, Pelecus cultratus and Alburnus alburnus, in neusiedler see

Pelecus cultratus and Alburnus alburnus arc two dominant cyprinid fishes in the open lake of Neusicdler See (Austria). Food resource partioning between two species was studied through June to November, 1994. From Junc to Septcmber, Pelecus and Alburnus preferred cladocerans Diaphanosoma mongolianum and Leptodora kindti, resulting in a high degree of dietary overlap.In October and Novembcr, Pelecus fcd mainly on copepod Arctodiaptomus spinosus and insects drifting at the water surface, while Alburnus exclusively consumed lnsects, and the overlap be-came minimal. The observed changcs in the dict of and ovcrlap betwecn these specics were caused by seasonal varlatlon in food abundance and compositlon, combined with the divergence in forag-ing profitability of the fishes. Niche segregation was profound in lean-food scasons, and this may be a responsible process of the fishes coexistence.