| 摘要: |
| 欧飘Pelecus cultratus(L).和欧白鱼Alburnus alburnus(L).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Daiphanosoma mongolianum和透明薄皮Leptodora kindti,生态位重叠度高.在10月和11月,欧飘主食烧足类刺北缥水Artodiaptomus spinosus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. |
| 关键词: 欧飘 欧白鱼 食物资源分配 生态位重叠 物种共存 |
| DOI：10.18307/1997.0111 |
| 分类号: |
| 基金项目:奥地利环境、青年与家庭部资助 |
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| Resource partitioning between cyprinids, Pelecus cultratus and Alburnus alburnus, in neusiedler see |
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Liu Zhengwen
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Nanjing Institute of Geography and Limnology Chinese Academy of Sciences, Nanjing 210008
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| Abstract: |
| Pelecus cultratus and Albumus alburnus are two dominant cyprinid fishes in the open lake of Neusiedler See (Austria). Food resource partioning between two species was studied through June to November, 1994. From June to September, Pelecus and Alburnus preferred cladocerans Dlaphanosoma mongolianum and Leptodora kindti, resulting in a high degree of dietary overlap. In October and November, Pelecus fed mainly on copepod Arctodiaptomus spinosus and insects drifting at the water surface, while Alburnus exclusively consumed insects, and the overlap became minimal. The observed changes in the diet of and overlap between these species were caused by seasonal variation in food abundance and composition, combined with the divergence in foraging profitability of the fishes. Niche segregation was profound in lean-food seasons, and this may be a responsible process of the fishes coexistence. |
| Key words: Pelecus cultratus Alburnus alburnus resource partioning niche overlap species coexistence |
