Gliwicz Z Maciej, Stibor Herwig
Max-Planck-Institut für Limnologie, Postfach 165, D-24306, Plön, Germany.
Oecologia. 1993 Aug;95(2):295-298. doi: 10.1007/BF00323503.
Both field observations and enclosure experiments show that juvenile copepods enter Daphnia brood cavities to feed on Daphnia eggs and embryos. The ability to perform such in vivo exploitation is reported for both cyclopoid and calanoid copepods. Copepodites of Acanthocyclops robustus (G.O. Sars) were found to eat eggs in brood cavities of D. magna, D. pulex and D. pulicaria in experimental enclosures rich in algae. Copepodites of Eudiaptomus gracilus (G.O. Sars) were found in brood cavities of D. hyalina in a mesotrophic lake. The copepods' intrusions into brood cavities caused dramatic declines in the clutch size of infested Daphnia, and this predation effect could easily be confused with the effect of severe food limitation.
野外观察和围隔实验均表明，幼体桡足类动物会进入水蚤的育儿袋，以水蚤的卵和胚胎为食。据报道，剑水蚤类和哲水蚤类桡足类动物均具备这种体内捕食能力。在富含藻类的实验围隔中，人们发现强壮棘剑水蚤（G.O. 萨斯）的桡足幼体会取食大型溞、蚤状溞和直额溞育儿袋中的卵。在一个中营养湖泊中，人们在透明溞的育儿袋中发现了纤细真镖水蚤（G.O. 萨斯）的桡足幼体。桡足类动物侵入育儿袋导致受感染水蚤的产卵量急剧下降，而这种捕食效应很容易与严重食物限制的效应相混淆。
