On the Evolution of Pseudogamy

Stenseth, Nils Chr.; Kirkendall, Lawrence R.; Moran, Nancy A.

doi:10.2307/2408363

Cited by 38 publications

(30 citation statements)

References 22 publications

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“…This question has been addressed in another poeciliid, Poeciliopsis, where several studies demonstrated that mating success of asexuals was inversely correlated with density (e.g. Moore & McKay 1971;Stenseth et al 1985; but see Keegan-Rogers & Schultz 1988). Our data, however, do not support negative frequency dependence of male mate choice, since P. formosa was always the more common species.…”

Section: Discussioncontrasting

confidence: 69%

Female sperm limitation in natural populations of a sexual/asexual mating complex ( Poecilia latipinna , Poecilia formosa )

2008

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In sperm-dependent sexual/asexual mating systems, male mate choice is critical for understanding the mechanisms behind apparent stability observed in natural populations. The gynogenetic Amazon molly (Poecilia formosa) requires sperm from sexual males (e.g. Poecilia latipinna) to trigger embryogenesis, but inheritance is strictly maternal. Consequently, males should try to avoid or reduce the cost of mating with asexuals. We investigated male mate choice by documenting the presence of sperm in natural populations and found that a higher proportion of sexual females had sperm than asexuals. In addition, among those females that had sperm, sexuals had more sperm than asexuals. Our results hint at a role for male mate choice as a stabilizing factor in such systems.

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Section: Discussioncontrasting

confidence: 69%

Female sperm limitation in natural populations of a sexual/asexual mating complex ( Poecilia latipinna , Poecilia formosa )

2008

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“…For example, coexistence ofan asexual sperm parasite and its sexual host (such as occurs in Poeciliopsisi does not require niche partitioning (Moore and McKay, 1971;Keister et al, 1981;Moore, 1976;Stenseth et al, 1985). However, sperm-dependence alone does not explain coexistence of multiple clones, and it has no bearing on coexistence among clones of a truly parthenogenetic species.…”

Section: Discussionmentioning

confidence: 99%

SPATIAL AND TEMPORAL FACTORS AFFECTING COEXISTENCE AMONG SEXUAL AND CLONAL FORMS OF POECILIOPSIS

Schenck

Vrijenhoek

1986

Evolution

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Abstract, -We examined spatial and seasonal factors affecting coexistence of closely related sexual and asexual fishes of the genus Poeciliopsis living in two ecologically distinct stream habitats. Stream order and productivity influenced frequencies of these fish, and local habitat patchiness contributed strongly to spatial segregation. The magnitude and direction of local segregation was unaffected by striking seasonal variation in one stream. For the second stream, the relative contributions oflocal, geographical, and seasonal components ofspatial variation were assessed through estimation of variance components. Spatial segregation at the smallest scale accounted for the largest proportion of variance in the distribution of species and clones.

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“…One possible factor is negative frequency-dependent reproductive success of P. formosa (Moore 1984;Stenseth et al 1985;Kirkendall and Stenseth 1990;Ryan et al 1996) as a result of plastic or context-dependent male mate choice (Moore 1984;Keenan-Rogers and Schultz 1988). Avoidance of P. formosa may be more important when the cost of mating with a gynogenetic female is a loss of a rare opportunity to mate with a conspecific female (Kawecki 1988;Pfennig 1998).…”

Section: What Of the Evolutionary Fate Of Amazon Mollies?mentioning

confidence: 99%

Peering Through the Looking Glass at a Sexual Parasite: Are Amazon Mollies Red Queens?

Dries

2003

Evolution

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Abstract. The gynogenetic Amazon molly (Poecilia formosa) is a clonal, all-female lineage of livebearing fish that faces an unusual obstacle to evolutionary persistence. Sperm from heterospecific males (either sailfin, P. latipinna, or Atlantic, P. mexicana, mollies) is necessary to trigger embryogenesis. However, none of the male's genes are incorporated into the genome of the gynogenetic offspring. Some investigators have proposed that the evolution of male mate discrimination is a result of this cost, leading to a coevolutionary arms race between male avoidance of P. formosa and P. formosa attractiveness. Given that P. formosa successfully reproduces and has not yet gone extinct, it is clear there are mechanisms by which they attract the sexual attention of males. Although a Red Queen coevolutionary process in typical host/parasite systems has been shown to favor the persistence of sexual species, in this system an arms race has been invoked to explain the reverse. Here I present behavioral data supporting a more parsimonious scenario: that mechanisms of attraction in P. formosa are simply a consequence of its hybrid origin. Poecilia latipinna and P. mexicana males do not discriminate between gynogenetic P. formosa females and first generation sexual hybrid females, and females do not differ in agonistic behaviors associated with competition for mates. Both results contradict predictions from the Red Queen hypothesis. Therefore, coevolution is not necessary to explain the apparent evolutionary persistence of P. formosa. Evolutionary theory predicts that clonal or asexual lineages will suffer a loss in average fitness over time due to a range of

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On the Evolution of Pseudogamy

Cited by 38 publications

References 22 publications

Female sperm limitation in natural populations of a sexual/asexual mating complex ( Poecilia latipinna , Poecilia formosa )

Female sperm limitation in natural populations of a sexual/asexual mating complex ( Poecilia latipinna , Poecilia formosa )

SPATIAL AND TEMPORAL FACTORS AFFECTING COEXISTENCE AMONG SEXUAL AND CLONAL FORMS OF POECILIOPSIS

Peering Through the Looking Glass at a Sexual Parasite: Are Amazon Mollies Red Queens?

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