Frequency-dependence of mating success in Poeciliopsis monacha (Pisces, Cyprinodontiformes) reproductive complex, Sonora, Mexico
A diversity of all-female fishes of the genus Poeciliopsis coexists with their sexual ancestor species in streams of western Mexico. All-females are hybrids that depend on the sperm of paternal species to reproduce. Rare-female advantage is one of several hypotheses that attempt to explain how the d...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Instituto de Tecnologia do Paraná (Tecpar)
2002-06-01
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| Series: | Brazilian Archives of Biology and Technology |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132002000200006 |
| Summary: | A diversity of all-female fishes of the genus Poeciliopsis coexists with their sexual ancestor species in streams of western Mexico. All-females are hybrids that depend on the sperm of paternal species to reproduce. Rare-female advantage is one of several hypotheses that attempt to explain how the diversity of all-female biotypes is maintained within the Poeciliopsis reproductive complexes. According to this hypothesis, the uncommon all-female biotype has a mating advantage over the common ones and has been maintained by a dynamic equilibrium process. In the P. monacha reproductive complex at Arroyo de los Platanos the density of two all-female biotypes (P. 2monacha-lucida I and II) varies across pools. The objective of this study was to analyse fecundity and mating success of females from this arroyo to test the hypothesis. Female mating success was inversely correlated to their density, supporting this hypothesis.<br>Uma diversidade de fêmeas unissexuadas do gênero Poeciliopsis coexiste com seus ancestrais sexuados em riachos do oeste mexicano. Fêmeas unissexuadas são híbridos que dependem do esperma da espécie parental paternal para se reproduzir. Várias hipóteses, incluindo a vantagem da fêmea rara, procuram explicar como a diversidade do biótipos unissexuados é mantida nos complexos reprodutivos de Poeciliopsis. A hipótese propõem que os biótipos unissexuados menos frequentes tenham vantagem de cruzamento sobre os biótipos mais frequentes e que existe um equilíbrio dinâmico regulando tal processo. No complexo reprodutivo de P. monacha localizado no Arroyo de los Platanos, a densidade de dois biótipos unissexuados (P. 2monacha-lucida I e II) variam entre as piscinas formadas. O objetivo do presente estudo foi analisar a fecundidade e o sucesso de cruzamento das fêmea deste riacho para testar a hipótese. O sucesso de cruzamento das fêmeas foi inversamente correlacionado a sua densidade, dando suporte a hipótese levantada. |
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| ISSN: | 1516-8913 1678-4324 |