von Bonsdorff B, Bylund G
Ecol Dis. 1982;1(1):21-6.
The life cycle of the broad tapeworm Diphyllobothrium latum is discussed. To complete its development from egg to adult worm the parasite has to pass through two obligatory intermediate hosts before invading its final host. At each stage critical ecological parameters have to be encountered, among them oxygen concentration, light intensity and temperature. The first intermediate host, which remained unknown for a long time, is one of many copepod species; the second hosts are fish, notably species belonging to the genera Esox. Perca and Lota. The parasite remains in the latter until eaten by Man and his domesticates. The prerequisites for the parasite's development are precise, and the elimination of only one is sufficient to free an area of infection.
本文讨论了阔节裂头绦虫的生命周期。为了从虫卵发育为成虫，该寄生虫在侵入终末宿主之前必须经过两个 obligatory 中间宿主。在每个阶段，它都必须遇到关键的生态参数，其中包括氧气浓度、光照强度和温度。长期以来一直未知的第一中间宿主是众多桡足类物种之一；第二中间宿主是鱼类，特别是属于梭鲈属、鲈属和江鳕属的物种。寄生虫会一直寄生于后者体内，直到被人类及其家畜吞食。寄生虫发育的前提条件很精确，消除其中任何一个条件就足以使一个地区摆脱感染。
