Seitz Alfred
Lehrstuhl für Tierökologie der Universität Bayreuth, Postfach 3008, D-8580, Bayreuth, Federal Republic of Germany.
Oecologia. 1980 Dec;47(3):333-339. doi: 10.1007/BF00398526.
Data are presented which make it most probable that selection according to relative visibility (represented by body size and egg ratio) and relative mortality stabilize the coexistence of Daphnia hyalina hyalina Leydig, D. galeata gracilis Hellich and D. cucullata Sars in the prealpine Klostersee. The results are based on multiple and partial correlation analyses which showed positive partial correlation between relative size and/or relative egg ratio and/or relative abundance, and the index of selectivity (W) according to Vanderploeg and Scavia (1979). Further it turned out that besides size, abundance, and egg ratio, the lake temperature but not other environmental parameters are related with the mortality of Daphnia. From these data a verbal descriptive model is derived which explains the seasonal segregation and stable coexistence of the three species.
所呈现的数据极有可能表明，根据相对可见性（以体型和卵比率表示）以及相对死亡率进行的选择，使得前阿尔卑斯山区克洛斯特湖中的透明溞透明变种（Daphnia hyalina hyalina Leydig）、纤细盔形溞（D. galeata gracilis Hellich）和锯缘溞（D. cucullata Sars）能够稳定共存。这些结果基于多重和偏相关分析，分析表明相对体型和/或相对卵比率和/或相对丰度与根据范德普洛格和斯卡维亚（1979年）提出的选择性指数（W）之间存在正偏相关。此外还发现，除了体型、丰度和卵比率外，湖水温度而非其他环境参数与溞的死亡率相关。从这些数据中得出了一个文字描述模型，该模型解释了这三个物种的季节性隔离和稳定共存现象。
