Boersma Maarten, Schöps Claudia, McCauley Edward
Max-Planck-Institut für Limnologie, Postfach 165, 24302, Plön, Germany.
Department of Biological Sciences, Division of Ecology, University of Calgary, Calgary, AB T2N 1N4, Canada.
Oecologia. 2001 Nov;129(3):342-348. doi: 10.1007/s004420100728. Epub 2001 Nov 1.
The quality of natural seston as food for zooplankters can be highly variable. Thus far, experimental evidence on the factors affecting food quality under natural conditions is scarce. Hence, in this study, we set out to investigate how Daphnia galeata × hyalina responded to qualitative variation in natural seston. This was done in laboratory experiments where we supplement natural seston from a mesotrophic lake with dissolved phosphorus and emulsions of highly unsaturated "essential" fatty acids. The growth rate of juveniles increased upon the supply of both phosphorus and fatty acids. These results suggest that these phosphorus and highly unsaturated fatty acids are substitutable and thus challenge our existing interpretation/understanding of how herbivore growth is "limited".
作为浮游动物食物的天然浮游生物的质量可能变化很大。到目前为止，关于自然条件下影响食物质量因素的实验证据很少。因此，在本研究中，我们着手研究盔形溞×透明溞如何应对天然浮游生物的质量变化。这是在实验室实验中完成的，我们向中营养湖泊的天然浮游生物中添加溶解的磷和高度不饱和“必需”脂肪酸乳液。磷和脂肪酸供应后，幼体的生长速率增加。这些结果表明，这些磷和高度不饱和脂肪酸是可替代的，因此挑战了我们对食草动物生长如何“受限”的现有解释/理解。
