Amorim Pedro F, Katz Axel Makay, Ottoni Felipe Polivanov, de Bragança Pedro Henrique Negreiros
Laboratory of Systematics and Evolution of Teleost Fishes, Genetic Graduation Program, Institute of Biology, Federal University of Rio de Janeiro, CEP 21941-902, Rio de Janeiro, Brazil. E-mail:
Laboratory of Systematics and Evolution of Teleost Fishes, Biodiversity and Evolutionary Biology Graduation Program, Institute of Biology, Federal University of Rio de Janeiro, CEP 21941-902, Rio de Janeiro, Brazil. E-mail:
Zool Stud. 2022 Feb 23;60:e4. doi: 10.6620/ZS.2022.61-04. eCollection 2022.
The species group is composed of the only three vertebrate species that lack females. These species present only males and simultaneously hermaphroditic individuals; that are able to reproduce by allogamy, with males, or by autogamy, performing self-fertilization and generating clones of themselves. The proportion of males is variable among those species and even among their populations. has the smallest proportion of males. Indeed, no males have been recorded in most known populations. This is a mainly autogamous species, with small populations having a disjunct distribution along the eastern and northern coast of Brazil. Species presenting such adaptations would be expected to have an elevated rate of genetic population structure, reflecting any barriers that obstruct gene flow between populations. Partial sequences of the mitochondrial cytochrome oxidase I () gene from 335 individuals were sampled to perform a population analysis. Only a single haplotype of , widely distributed throughout all the sampled populations, was recovered for . Here we hypothesize that the high degree of communication within populations is probably the main biological feature leading to this pattern.
这个物种组由仅有的三种没有雌性的脊椎动物物种组成。这些物种只有雄性和同时具有雌雄同体特征的个体；它们能够通过异体受精与雄性繁殖，或者通过自体受精进行自我受精并产生自身的克隆体。这些物种之间甚至在其种群中，雄性的比例都是可变的。[物种名称未给出]的雄性比例最小。实际上，在大多数已知种群中都未记录到雄性。这是一个主要进行自体受精的物种，其小种群沿着巴西东部和北部海岸呈间断分布。具有这种适应性的物种预计会有较高的遗传种群结构速率，反映出阻碍种群间基因流动的任何障碍。对335个个体的线粒体细胞色素氧化酶I（COI）基因的部分序列进行采样以进行种群分析。对于[物种名称未给出]，仅回收了一种广泛分布于所有采样种群中的单倍型。在此我们假设，种群内高度的交流可能是导致这种模式的主要生物学特征。
