Schöne Christine
II. Zoologisches Institut, Erlangen, Deutschland.
, Brunnenstr. 19, BRD-5105, Laurensberg, Deutschland.
Oecologia. 1971 Sep;6(3):254-266. doi: 10.1007/BF00344918.
Enchytraeus albidus was fed with Fucus, green algae, Zostera marina and Delesseria. Judging from absorption of food, rate of reproduction and duration of life, the animals preferred the plants in the sequence given above.As the putrefaction of a Fucus substrate advances, more and more enchytraeids leave it. A changing salinity of the substrate also influences the number of emigrating worms, increasing it from 15-45‰, but decreasing it towards 60‰. Fed with Fucus E. albidus tolerates a salinity of 60-70‰ on sand for more than 4 weeks, on filter paper only 50‰ for about one week.Reproduction is possible at salinities up to 40‰. Cocoon production is most frequent at 5‰. The mortality of young worms within the cocoons is lowest at 15‰. The incubation period is significantly shorter at salinities of 0-15‰ than at 30 and 40‰.As a terrestrial immigrant to the seashore Enchytraeus albidus secondarily enlarged its range of poikilosmosis, tolerating a concentration of 72‰ in its coelomic fluid for some time. At low salinities it maintains a remarkable degree of hyperosmosis.
用墨角藻、绿藻、大叶藻和德氏藻喂养白线蚓。从食物摄取、繁殖率和寿命来看，这些动物对上述植物的偏好顺序是这样的。随着墨角藻基质腐烂程度加深，越来越多的白线蚓离开它。基质盐度的变化也会影响迁出蚯蚓的数量，盐度从15‰到45‰时数量增加，但盐度接近60‰时数量减少。以墨角藻为食的白线蚓在沙子上能耐受60‰至70‰的盐度超过4周，在滤纸上只能耐受50‰的盐度约一周。盐度高达40‰时仍可繁殖。盐度为5‰时茧的产生最为频繁。茧内幼蚓的死亡率在盐度为15‰时最低。0‰至15‰盐度下的孵化期明显短于30‰和40‰盐度下的孵化期。作为从陆地迁移到海滨的物种，白线蚓次生地扩大了其变渗透压范围，其体腔液能在一段时间内耐受72‰的浓度。在低盐度下，它保持着显著程度的高渗状态。
