性畸变对腹足类生殖和种群的影响

具有内分泌干扰效应的三丁基锡能引起腹足类产生性畸变现象。在性畸变过程中 ,雌性个体会由于生殖孔口被前列腺取代或被输精管阻塞、贮精囊或卵囊腺开裂、卵囊腺内部被阻塞以及卵巢转化为精巢等多种原因而丧失生殖能力 ,甚至死亡。并由此引起雌、雄性比和幼、成年个体比的降低 ,导致种群衰退。有浮游幼体的种类可以通过外来种群的成功迁入使种群得以维持 ,而无浮游幼体的种类 ,由于幼体迁移能力差而最终导致种群的区域性灭绝。性畸变这种典型的功能效应对其他内分泌干扰物质的生态效应研究有启示作用。

Effects of imposex on reproduction and population of gastropods

Imposex in gastropods can be induced by tributyltin,which acts as endocrine disrupting chemicals.In the development of imposex,female will become sterile and even dead when the vulva is replaced by the prostate or blocked by the vas deferens,the bursa compulatrix or the capsule gland opens,the capsule gland is blocked interiorly,and the ovary becomes testis.Subsequently,the ratio of female to male and the juveniles to the adults decreases,and the population declines.The population with planktonic larva can sustain by immigrating,while one without planktonic larva will extinct locally due to the limited dispersal of juvenile snails.The functional effect of imposex is revelatory to the research of ecological effect for other endocrine disrupting chemicals.