Results 161 to 170 of about 2,291 (190)
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Polymorphic MHC loci in an asexual fish, the amazon molly (Poecilia formosa; Poeciliidae)
Molecular Ecology, 2008AbstractGenes of the major histocompatibility complex (MHC) encode molecules that control immune recognition and are highly polymorphic in most vertebrates. The remarkable polymorphisms at MHC loci may be maintained by selection from parasites, sexual selection, or both.
Schaschl, H +4 more
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Mating preferences of Amazon mollies (Poecilia formosa) in multi-host populations
Behaviour, 2012Gynogenesis is a peculiar mode of clonal reproduction in which eggs need to be pseudo-fertilized by sperm, but the male genes are not passed on to the offspring. One mating system in which gynogenesis is found involves a unisexual hybrid, the Amazon molly (Poecilia formosa), which typically uses males of its two parental species as sperm donors.
Brandon L. Joachim, Ingo Schlupp
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Cytophotometric evidence for triploidy in hybrids of the gynogenetic fish, Poecilia formosa
Journal of Experimental Zoology, 1965AbstractAmounts of DNA per nucleus were estimated by microphotometry in Feulgen‐stained tissue sections from several species of poeciliid fish and their hybrid offspring. In terms of average nuclear volumes as well as relative DNA levels, the all‐female gynogenetic species P. formosa was indistinguishable from the related bisexual species P.
Rasch, Ellen M. +3 more
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Environmental Biology of Fishes, 2013
Unisexual sperm-dependent species depend on a sexual host for reproduction, and must live in sympatry with their sperm donor. If niche overlap between the species is substantial, the intrinsic faster population growth of the unisexual over sexual species can cause competitive exclusion of the host from resources, causing the demise of the unisexual ...
Laura Alberici da Barbiano +4 more
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Unisexual sperm-dependent species depend on a sexual host for reproduction, and must live in sympatry with their sperm donor. If niche overlap between the species is substantial, the intrinsic faster population growth of the unisexual over sexual species can cause competitive exclusion of the host from resources, causing the demise of the unisexual ...
Laura Alberici da Barbiano +4 more
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The development of thyroid neoplasia in old age in the amazon molly, Poecilia formosa
Experimental Gerontology, 1977Abstract In a previous paper we have described the appearance of a thyrotrophin sensitive thyroid neoplasm in an few senile individuals from a laboratory population of guppies, Lebistes reticulatus (Peters). Material has now been examined from the closely related species, Poecilia formosa , the Amazon molly, in which the incidence of thyroid ...
A D, Woodhead, R B, Setlow, R W, Hart
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Proceedings of the Royal Society of London. Series B. Biological Sciences, 1966
The histological study of the homotransplanted pituitary of Poecilia formosa , grafted for 7 weeks in fish that were hypophysectomized 3 weeks after the transplantation, revealed considerable variation in the size and cellular composition of the grafts. However, certain general conclusions were drawn from the study.
M, Olivereau, J N, Ball
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The histological study of the homotransplanted pituitary of Poecilia formosa , grafted for 7 weeks in fish that were hypophysectomized 3 weeks after the transplantation, revealed considerable variation in the size and cellular composition of the grafts. However, certain general conclusions were drawn from the study.
M, Olivereau, J N, Ball
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Journal of Fish Biology, 2010
Feeding rates of the gynogenetic Amazon molly Poecilia formosa and one of its sexual hosts, the sailfin molly Poecilia latipinna, were measured under winter and summer temperature conditions. Food consumption of the unisexual P. formosa in winter conditions was significantly higher than that of P.
C, Fischer, I, Schlupp
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Feeding rates of the gynogenetic Amazon molly Poecilia formosa and one of its sexual hosts, the sailfin molly Poecilia latipinna, were measured under winter and summer temperature conditions. Food consumption of the unisexual P. formosa in winter conditions was significantly higher than that of P.
C, Fischer, I, Schlupp
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A haploid-diploid-triploid mosaic of the Amazon molly, Poecilia formosa.
Cytogenetic and genome research, 2008We report the finding of the first haploid-diploid-triploid mosaic fish from the family Poeciliidae. The animal was derived from a laboratory cross of a female F1 hybrid of Poecilia mexicana and P. latipinna with a male from an ornamental strain derived from P. mexicana and P. sphenops (Black molly).
K P, Lampert +4 more
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Cytogenetics and cell genetics, 1992
Chromosomes of the Amazon molly, Poecilia formosa, a unisexual species of hybrid origin, were investigated by C-banding, silver staining, and fluorescent staining with DAPI, quinacrine dihydrochloride, and chromomycin A3. Analysis of heterochromatin distribution indicates that chromosomes similar to the W chromosome of P.
L, Sola +4 more
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Chromosomes of the Amazon molly, Poecilia formosa, a unisexual species of hybrid origin, were investigated by C-banding, silver staining, and fluorescent staining with DAPI, quinacrine dihydrochloride, and chromomycin A3. Analysis of heterochromatin distribution indicates that chromosomes similar to the W chromosome of P.
L, Sola +4 more
openaire +2 more sources