Mode of maternal provisioning in the fish genus Phalloceros : a variation on the theme of matrotrophy
Mode of maternal provisioning in the fish genus Phalloceros : a variation on the theme of matrotrophy
复制标题
石笔鱼属的母体供应模式：母体营养主题的变体
DOI：
10.1093/biolinnean/blab121
复制
发表时间：
2021
影响因子：
1.9
通讯作者：
Reznick, David N
中科院分区：
文献类型：
--
作者：
Zandonà, Eugenia;Kajin, Maja;Buckup, Paulo A;Amaral, Jeferson Ribeiro;Souto-Santos, Igor C;Reznick, David N
胎盘是一个复杂的器官，表现出高度的形态多样性。在鱼类中，第一个脊椎动物已经进化出胎盘，家庭Poeciliidae表现出非常不同的模式，即使在同类物种之间的孕产妇供应。在这里，我们研究了最近描述的高度多样化的Phalloceros属（Eigenmann，1907）的7个物种的胚胎生长曲线。我们还调查了可能的种内差异，以及其他女性特征是否影响胚胎质量。我们发现胚胎质量下降，直到第20阶段左右，然后增加，导致从受精到出生的质量增加了1.5到3倍。胚胎质量随发育阶段呈非线性变化，并受种属（或产地）和雌性体细胞干质量的影响。这种最初的损失，然后在发育过程中获得胚胎质量是独特的其他Poeciliidae物种，并保存在种群和物种，即使在出生时的大小可能会有所不同。其他物种如果没有胎盘，则会失去质量，如果有胎盘，则会指数增长质量。因此，Phalloceros模式的母亲提供可能代表了一个不同的形式，从其他物种的Poeciliidae。
The placenta is a complex organ that shows high morphological diversity. Among fish, the first vertebrates that have evolved a placenta, the family Poeciliidae exhibits very diverse modes of maternal provisioning even among congeneric species. Here, we investigated the embryonic growth curve across seven recently-described species of the highly diverse genusPhalloceros(Eigenmann, 1907). We also investigated possible intraspecific differences and whether other female characteristics affected embryo mass. We found that embryo mass decreased until around stage 20 and then increased, resulting in a 1.5 to 3-fold mass gain from fertilization to birth. Embryo mass changed non-linearly with stage of development and was affected by species identity (or locality) and female somatic dry mass. This initial loss then gain of embryonic mass during development is unique among other Poeciliidae species and was conserved across populations and species, even though size at birth can vary. Other species instead either lose mass if they lack placentas or gain mass exponentially if they have placentas. ThePhallocerosmode of maternal provisioning could thus represent a different form from that seen in other species of Poeciliidae.