Weider L J, Wolf H G
Abteilung Ökophysiologie, Max-Planck-Institut für Limnologie, Postfach 165, W-2320, Plön, Federal Republic of Germany.
Oecologia. 1991 Sep;87(4):506-513. doi: 10.1007/BF00320413.
Life-history variation was examined among members of theDaphnia longispina group, which consists ofD. galeata, D. hyalina, D. cucullata, and hybrids. Factorial experiments were conducted at two temperatures (14° and 20° C) and two food concentrations (0.2 and 1.0 mg Cl). Differences in life-history features (size at maturity, age at first reproduction, size of first clutch, offspring size in first clutch) under the different environmental conditions were assessed among eightDaphnia clones, which represented members of this species complex. Significant differences between parentals and hybrids for most life-history features were observed under various treatments; generally, hybrid clones showed intermediate life-history traits when compared with parentals. When comparisons were made among clones within a given species (i.e.D. galeata, D. galeata xcucullata, D. cucullata), clonal differences were also noted for certain life-history traits. The data are discussed with reference to the formation and maintenance of hybrid species complexes in nature.
对长刺溞类群的成员进行了生活史变异研究，该类群由盔形溞、透明溞、弯尾溞及杂交种组成。在两个温度（14℃和20℃）和两个食物浓度（0.2和1.0毫克氯）条件下进行了析因实验。在代表该物种复合体成员的8个溞属克隆中，评估了不同环境条件下生活史特征（成熟时的大小、首次繁殖的年龄、第一窝卵的大小、第一窝卵中的后代大小）的差异。在各种处理下，观察到大多数生活史特征在亲本和杂交种之间存在显著差异；一般来说，与亲本相比，杂交克隆表现出中间生活史特征。当在给定物种内（即盔形溞、盔形溞×弯尾溞、弯尾溞）的克隆之间进行比较时，某些生活史特征也存在克隆差异。结合自然界中杂交物种复合体的形成和维持对这些数据进行了讨论。
