双齿围沙蚕摄食自然沉积物的研究

Study on Feeding Natural Sediment of Perinereis aibuhitensis

采用肠道内含物的分析方法,测定了双齿围沙蚕(Perinereis aibuhitensis)摄食沉积物时的颗粒选择性和摄食效率.结果显示,双齿围沙蚕摄食时偏向于摄食较小粒径的颗粒,该结论符合底栖动物最佳觅食模型;双齿围沙蚕饱食沉积物所需时间较其他多毛类短,2.5h左右,摄食周期大约7h.单位体重摄食率(以干重计)为(0.469±0.196)g/(g·d),比报道的其他多毛类摄食率低.与同类研究相比,文中还对造成结果差异的原因进行了简单分析.

Some Perinereis aibuhitensis were cultured in the laboratory, and the gut content experiments were carried out later. The result of particle selection experiment shows that P.aibuhitensis intendes to select smaller particles, and this result accords with the predictions of deposit-feeders optimal foraging models. The feeding rate of P.aibuhitensis on natural sedi- ment is 0.469 ±0.196）g/（g·d ） , and the weights are dry weights of sediment and P.aibuhitensis body. This rate was much lower than that of other polychaeta. The result of feeding rate experiment also shows that P.aibuhitensis will eat enough food after 2.5 hours, and its feeding cycle is about 7 hours. Compare with similar studies, the reasons of these differences are also discussed in this paper.