Lack of Calling Song Displacement Between Two Closely Related Ground Crickets

Veech, Joseph A.; Benedix, J. H.; Howard, Daniel J.

doi:10.1111/j.1558-5646.1996.tb03585.x

Cited by 11 publications

(9 citation statements)

References 30 publications

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“…The importance of reinforcement and reproductive character displacement has been controversial because of theoretical difficulties (Felsenstein, 1981;Paterson, 1982;Barton & Hewitt, 1985;Spencer et al, 1986;Butlin, 1989) and lack of empirical evidence (Walker, 1974a;Veech et al, 1996). However, recent theoretical developments using genetic models suggest that reproductive character displacement could occur under a wide variety of conditions (Liou & Price, 1994;Kelly & Noor, 1996;Servedio & Kirkpatrick, 1997;Kirkpatrick & Servedio, 1999;Kirkpatrick, 2000).…”

Section: Introductionmentioning

confidence: 99%

Divergence in the calling songs between sympatric and allopatric populations of the southern wood cricket Gryllus fultoni (Orthoptera: Gryllidae)

Jang

Gerhardt

2006

Journal of Evolutionary Biology

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In the eastern United States the wood cricket Gryllus fultoni (Orthoptera: Gryllidae) occurs in sympatry with G. vernalis in an area between eastern Kansas and west of the Appalachian Mountains. Calling songs were recorded from 13 sympatric and allopatric localities. Both field and laboratory recordings showed that chirp rate (CR) and pulse rate (PR) overlapped extensively between allopatric populations of G. fultoni and sympatric populations of G. vernalis; by contrast, there was little or no overlap in these variables between sympatric populations of these two species. Divergence in PR and CR between the two species was thus greater in areas of sympatry than in areas of allopatry. Our field and laboratory studies of G. fultoni calling songs thus demonstrate the pattern expected of character displacement and support the genetic assumptions of this hypothesis. Other possible explanations for the sympatric divergence such as ecological character displacement and clinal variation are discussed.

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Section: Introductionmentioning

confidence: 99%

Divergence in the calling songs between sympatric and allopatric populations of the southern wood cricket Gryllus fultoni (Orthoptera: Gryllidae)

Jang

Gerhardt

2006

Journal of Evolutionary Biology

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“…After extensive study (Howard and Furth 1986;Benedix and Howard 1991;Gregory and Howard 1993;Doherty and Howard 1996;Veech et al 1996), the only factor we have been able to identify that isolates the two species is conspecific sperm precedence Gregory and Howard 1994). Although females of both species paired exclusively with heterospecific males produce fertile hybrid offspring , when females of both species are mated to a conspecific male and a heterospecific male, heterospecific sperm rarely fertilize eggs Gregory and Howard 1994).…”

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Conspecific Sperm Precedence Is an Effective Barrier to Hybridization Between Closely Related Species

et al. 1998

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Abstract.-Conspecific sperm precedence is widespread in animals, appears to evolve rapidly, and is thought to have the potential to prevent hybridization between closely related species. However, to date no study has tested the isolating potential of such a barrier in mixed populations of two taxa under conditions in which other potential barriers to gene flow are controlled for or are prevented from operating. We tested the isolating potential of conspecific sperm precedence in the ground crickets Allonemobius fasciatus and A. socius in population cage experiments in which the frequency of the two species was varied. Despite the observation of abundant interspecific matings, the proportions of hybrid progeny were low and differed statistically from the proportions expected in the absence of conspecific sperm precedence. The results demonstrate that conspecific sperm precedence can severely limit gene flow between closely related species, even when one species is less abundant than the other. Key words.s-Allonemobius, barrier to fertilization, conspecific sperm precedence, cricket, hybridization, reproductive isolation, speciation.Received July 15, 1997. Accepted January 28, 1998 Postmating but prezygotic barriers to fertilization have begun to attract wide attention among evolutionists, as a large number of recent studies suggest that such barriers arise quickly and may represent the primary isolating barrier between many species of animals

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“…components were not statistically independent, a multivariate analysis of variance (MANOVA) was performed to test for variation in calling song (Table 1). The largest contributor to variation in calling song came from species-level effects (F = 160, P < 0.0001), followed by differences between field-collected and laboratory-reared crickets (F = 39, P < Benedix and Howard (1991), Olvido and Mousseau (1995), and Veech et al (1996). Overall, all calling-song characters varied significantly among populations and wild-caught versus laboratory-reared crickets, suggesting the importance of both genetic and environmental factors for variation in calling song.…”

Section: Laboratory Rearing and Pedigree Generationmentioning

confidence: 93%

“…The discovery of male calling-song differences between the two taxa (Howard and Furth 1986), as well as evidence of character displacement in song in areas of sympatry (Benedix and Howard 1991) focused our attention on male calling songs and led to more detailed studies of geographic and temporal variation in song (Veech et al 1996). Recent studies of female phonotaxis in these crickets (e.g., Doherty and Howard 1996) suggest that variation in male calling song is not the predominant mechanism for the reproductive isolation currently observed between the two cricket species.…”

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confidence: 99%

Genetic Variation in Cricket Calling Song Across a Hybrid Zone Between Two Sibling Species

Mousseau

Howard

1998

Evolution

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The sibling ground crickets Allonemobius fasciatus and A. socius meet along a mosaic hybrid zone at ≈ 40°N latitude in eastern North America. In this paper we report the findings of a genetic analysis of calling-song variation within and among six cricket populations sampled along a transect through the hybrid zone in southern New Jersey. We compared aspects of the calling song of both wild-caught and laboratory-reared crickets to test the hypothesis that population differences in song observed in the wild were genetically based. We found significant, species-level differences in all aspects of the calling song, and these differences persisted even after a generation of common-garden rearing in the laboratory, supporting the hypothesis that interspecific variation observed in the wild largely reflects genetic differentiation between the two taxa. A discriminant function analysis indicated that individual crickets could be assigned to the proper taxon with less than 10% error, supporting the premise that calling song could be used by female crickets as a mechanism for species recognition. One population, collected from within the hybrid zone and containing significant numbers of hybrid individuals, was intermediate in its calling song, presumably reflecting this population's mixed genetic makeup. In this hybrid zone population, song phenotype was highly correlated to a hybrid index score generated using species-specific alleles at four diagnostic allozyme markers, suggesting a multigenic basis to calling-song variation in these crickets as well as linkage disequilibrium between markers and song. Based on an analysis of laboratory-reared full-sib families, broad-sense heritabilities for calling-song characteristics were generally significant in the two A. socius populations, whereas many components of song showed no significant family effects in the three A. fasciatus populations. The genotypically mixed, hybrid zone population showed very high heritabilities for most calling-song components, which likely reflect the influence of interspecific gene flow on genetic variation for quantitative traits.

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Lack of Calling Song Displacement Between Two Closely Related Ground Crickets

Cited by 11 publications

References 30 publications

Divergence in the calling songs between sympatric and allopatric populations of the southern wood cricket Gryllus fultoni (Orthoptera: Gryllidae)

Divergence in the calling songs between sympatric and allopatric populations of the southern wood cricket Gryllus fultoni (Orthoptera: Gryllidae)

Conspecific Sperm Precedence Is an Effective Barrier to Hybridization Between Closely Related Species

Genetic Variation in Cricket Calling Song Across a Hybrid Zone Between Two Sibling Species

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