CONSEQUENCES OF MALE BROOD CARE - WEIGHT AND NUMBER OF NEWBORN IN A SEX-ROLE REVERSED PIPEFISH
CONSEQUENCES OF MALE BROOD CARE - WEIGHT AND NUMBER OF NEWBORN IN A SEX-ROLE REVERSED PIPEFISH
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DOI：
10.2307/2389517
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发表时间：
1992-01-01
影响因子：
5.2
通讯作者：
AHNESJO, I
中科院分区：
文献类型：
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作者：
AHNESJO, I
1. 在海龙中，雌性会争夺雄性，因此性别角色发生了逆转。 在这个物种中，雄性提供所有的育儿护理（即“怀孕”），雌性的繁殖率超过雄性的繁殖率。 因此，雌性受到交配机会的限制，而雄性繁殖成功率则受到雄性育雏能力和/或交配质量的限制。 因此，雄性可能会出现产仔减少以及新生儿数量和体重之间的权衡等现象。2． 在这篇论文中，我在雄性斑疹伤寒沙门氏菌中证明了以下几点：（a）卵子的初始重量（从雌性获得）对新生儿的体重有积极影响； (b) 在雄性的育儿袋中，新生儿的数量经常少于最初收到的卵的数量（育雏减少），并且育儿体积减少的程度对新生儿的重量产生积极影响； (c) 现场样本的雄性和大型实验雄性（独立于产仔减少）证明了新生儿数量和体重之间的权衡关系，但在小型雄性中则不然，因为它们可能将资源分配给其他几个需求（状况、生长等）； (d) 父亲身长本身并不影响新生儿的体重。3． 结果表明，在伤寒沙门氏菌中，雄性繁殖成功率受到其自身育雏能力的限制，并受到收到的卵大小（间接交配质量）的影响，这在性别角色逆转的情况下是可以预期的。
1. In the pipefish Syngnathus typhle sex roles are reversed, as females compete for access to males. In this species males provide all brood care (i.e. are 'pregnant') and female reproductive rate exceeds the reproductive rate of males. Consequently females are limited by access to mates and male reproductive success is limited by male brooding ability and/or mate quality. Thus, phenomena like brood reduction and a trade-off between number and weight of newborn may be expected in males.2. In this paper I demonstrate the following in males of S. typhle: (a) the initial weight of the egg (received from the female) positively influenced the weight of newborn; (b) in the male's brood pouch, number of newborn frequently is less than number of eggs initially received (brood reduction), and the extent of this decrease in brood size positively influenced the weight of newborn; (c) a trade-off between number and weight of newborn was demonstrated in males from field samples and in large experimental males (independent of brood reduction), but not in small males that presumably allocated resources to several other demands (condition, growth, etc.); (d) paternal length, per se, did not affect the weight of newborn.3. The results indicate that in S. typhle, male reproductive success is limited by their own brooding ability and influenced by the egg size received (indirectly quality of mate), which may be expected in a situation of sex-role reversal.