Solution to the "Char problem" based on Arctic char (Salvelinus alpinus) in Norway
Solution to the "Char problem" based on Arctic char (Salvelinus alpinus) in Norway
复制标题
基于挪威北极红点鲑（Salvelinus alpinus）解决“红点鲑问题”
DOI：
10.1139/f83-159
复制
发表时间：
1983
影响因子：
2.4
通讯作者：
H. Nordeng
中科院分区：
文献类型：
--
作者：
H. Nordeng
饲养和移植实验表明，三种共存的北极鲑（雌雄同体、小型和大型淡水居民）属于同一个基因库。每一种形式的部分都分离成这三种形式。单个个体可能在其一生中表现出所有三种形式，依次获得每种形式的外观和产卵颜色。雄性的成熟年龄比雌性小，体型也比雌性小。因此，在具有两种或两种以上形态的炭种群中，雄性在早熟形态中占主导地位，而雌性在晚熟形态中占主导地位。只有一种形态（性别比为1:1）的炭种群似乎是通过性成熟年龄的自然选择而建立起来的。幼龄阶段的隔离取决于它们的遗传结构和获取食物的途径。与无产卵父母的后代相比，小的常驻父母的后代产生更多的常驻个体和更少的小崽。食物量的增加增加了居民分数和r。
Rearing and transplantation experiments demonstrate that three coexisting forms of Arctic char Salvelinus alpinus (anadromous, small and large freshwater residents) belong to the same gene pool. The parr of each form segregate into all three forms. Single individuals may manifest all three forms during their lifetime, successively attaining the appearance and spawning color of each form. Males mature at a younger age and smaller size than females. Hence, in char populations featuring two or more forms, males dominate in the early maturing form and females in the late maturing form. Char populations that feature only one form (sex ratio 1:1) seem to be established through natural selection for age at sexual maturity. Segregation during the young stage depends upon their genetic constitution and access to food. Offspring of the small resident parents produced more resident individuals and fewer smolts than did offspring of anadromous parents. An increased amount of food increases the resident fraction and r...