van Donk Ellen, Hessen Dag O
Department of Nature Conservation, Section Aquatic Ecology, Agricultural University Wageningen, P.O. Box 8080, 6700 DD, Wageningen, The Netherlands.
Norwegian Institute for Water Research, Korsvoll, P.O. Box 69, N-0808, Oslo, Norway.
Oecologia. 1993 Apr;93(4):508-511. doi: 10.1007/BF00328958.
Grazing experiments were performed with the zooplankters Daphnia pulex and Daphnia magna, feeding on phosphorus-saturated and phosphorus-limited cells of two green algae (Scenedesmus subspicatus and Selenastrum capricornutum). P-limited algal cells passed largely intact through the gut and were thus spared from heavy grazing pressure. P-saturated algal cells, in contrast, were efficiently assimilated. Structural and morphological changes in the P-limited cells most probably reduced their digestibility. This phenomenon may be an important factor in zooplankton production and competition, and may serve as an example of a highly efficient strategy of P-limited algae to resist heavy grazing pressure.
利用浮游动物蚤状溞和大型溞进行了放牧实验，它们以两种绿藻（近刺栅藻和羊角月芽藻）的磷饱和细胞和磷限制细胞为食。磷限制的藻类细胞大多完整地通过肠道，因此免受重度放牧压力。相比之下，磷饱和的藻类细胞被有效同化。磷限制细胞的结构和形态变化很可能降低了它们的消化率。这种现象可能是浮游动物生产和竞争中的一个重要因素，并且可能作为磷限制藻类抵抗重度放牧压力的高效策略的一个例子。
