Is Decreased Frequency of Mating among Conspecifics a Cost of Sympatry in Salamanders?

Verrell, Paul A.

doi:10.2307/2410498

Cited by 18 publications

(24 citation statements)

References 4 publications

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“…Only the latter mechanism can be assigned to reproductive interference. Signal jamming, or "signal interference" (Verrell 1994), is the most indirect type of reproductive interference, as it does not necessarily involve close contact between individuals. Nevertheless, it might decrease the probability of conspecific encounters (Gerhardt and Klump 1988) and may lead to reduced conspecific mating frequencies.…”

Section: Signal Jammingmentioning

confidence: 99%

“…In species pairs with a high overlap in mate recognition traits, males may fail to recognize conspecific females and may prefer heterospecific females or even males. Misdirected courtship has been documented in many taxa (e.g., Mazor and Dunkelblum 1992;Verrell 1994;Ptacek 1998;Reitz and Trumble 2002;Scott et al 2005, Hochkirch et al 2006. Heterospecifics that resemble high-quality conspecifics may be perceived as especially attractive mates (Pfennig 1998).…”

Section: Misdirected Courtshipmentioning

confidence: 99%

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Reproductive Interference Between Animal Species

Gröning

Hochkirch

2008

The Quarterly Review of Biology

517

646

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Although sexual interactions between species (reproductive interference) have been reported from a wide range of animal taxa, their potential for determining species coexistence is often disregarded. Here, we review evidence from laboratory and field studies illustrating that heterospecific sexual interactions are frequently associated with fitness loss and can have severe ecological and evolutionary consequences. We define reproductive interference as any kind of interspecific interaction during the process of mate acquisition that adversely affects the fitness of at least one of the species involved and that is caused by incomplete species recognition. We distinguish seven types of reproductive interference: signal jamming, heterospecific rivalry, misdirected courtship, heterospecific mating attempts, erroneous female choice, heterospecific mating, and hybridization. We then discuss the sex-specific costs of these types and highlight two typical features of reproductive interference: density-dependence and asymmetry. Similar to competition, reproductive interference can lead to displacement of one species (sexual exclusion), spatial, temporal, or habitat segregation, changes in life history parameters, and reproductive character displacement. In many cases, patterns of coexistence might be shaped by reproductive interference rather than by resource competition, as the presence of a few heterospecifics might substantially decrease reproductive success. Therefore, interspecific sexual interactions should receive more attention in ecological research. Reproductive interference has mainly been discussed in the context of invasive species or hybrid zones, whereas its influence on naturally-occurring sympatric species pairs has rarely been addressed. To improve our knowledge of the ecological significance of reproductive interference, findings from laboratory experiments should be validated in the field. Future studies should also focus on ecological mechanisms, such as temporal spatial, or habitat partitioning, that might enable sexually interacting species to coexist. Reproductive interference also has implications for the management of endangered species, which can be threatened by sexual interactions with invasive or common species. Studies of reproductive interference might even provide new insights for biological pest control.

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Section: Signal Jammingmentioning

confidence: 99%

Section: Misdirected Courtshipmentioning

confidence: 99%

Reproductive Interference Between Animal Species

Gröning

Hochkirch

2008

The Quarterly Review of Biology

517

646

View full text Add to dashboard Cite

show abstract

“…InterspeciWc mating attempts can reduce Wtness and lead to decreased conspeciWc matings in mixed cultures (McLain and Shure 1987;Singer 1990;Verrel 1994). If both species are equally aVected, the initial density should determine the reproductive success and survival (Foster et al 1972).…”

Section: Discussionmentioning

confidence: 99%

Asymmetric reproductive interference between two closely related spider mites: Tetranychus urticae and T. turkestani (Acari: Tetranychidae)

2009

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Tetranychus turkestani Ugarov and Nikolskii and Tetranychus urticae Koch RF (red form) (Acari: Tetranychidae) are closely related species. Previously, the two species were found in separate agricultural habitats in Israel. Here, additional collections were undertaken and mixed populations of the two species were found. Manipulation experiments were conducted in order to test whether sexual interactions occur when T. turkestani and T. urticae RF share the same host. Interspecific crosses showed that the two species are capable of producing viable F(1) females, but that these females are sterile as their F(2) eggs failed to hatch. This indicates a post-zygotic reproductive barrier, supporting the current placement of T. turkestani as a separate taxon. Mating behavior parameters revealed that males of both species courted virgin conspecific and heterospecific females at the same rate and readily tried to copulate with them. Female mate recognition seemed to be more reliable in T. turkestani than in T. urticae RF as the number of copulations was significantly higher and their duration significantly shorter in the T. turkestani interspecific (T. turkestani female x T. urticae RF male) as compared to the intraspecific crosses, a phenomenon not observed in T. urticae RF. In mixed cultures, a significant reduction in female production was observed for T. urticae RF but not for T. turkestani, suggesting an asymmetric reproductive interference effect in favor of T. turkestani. The long term outcome of this effect is yet to be determined since additional reproductive factors such as oviposition rate and progeny survival to adulthood may reduce the probability of demographic displacement of one species by the other in overlapping niches.

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“…Hybrid offspring are often sterile or unviable, and interspecific reproductive interference can lower fitness by wasting time, energy and gametes as well as increase the risk of predation. These factors can reduce the lifespan of an individual which will have a negative effect on the lifetime reproductive success (Barton and Hewitt 1985, Verrell 1994, Gröning and Hochkirch 2008). Thus, selection should eradicate the propensity for heterospecific reproductive interactions from the population, leading to reproductive isolation and speciation to be completed.…”

Section: Heterospecific Reproductive Interactions In Naturementioning

confidence: 99%

The effect of male-male competition and ornament size on mean and variance of courtship intensity towards heterospecific and conspecific females

et al. 2015

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As species do not live in isolation from each other, they are faced with an elementary choice when searching for a mating partner: a choice between conand heterospecific individuals. Despite the remarkable research effort on hybridization and its avoidance, there are still some less well covered areas, e.g. what is the role of males in hybridization, what patterns are found in sympatric wild populations, what role do alternative reproductive tactics (ARTs) have on the likelihood of heterospecific matings, and what are the true costs of heterospecific interactions. In this thesis I first quantify the frequency of hybridization, backcrossing and heterospecific matings in sympatric wild populations of Calopteryx splendens and C. virgo damselflies in Finland. The possible influence of population densities, relative abundances of the species, and operational sex ratios on the frequency of heterospecific matings is also investigated. The second aim is to investigate how the intensity of territorial competition influences males' reproductive response to a heterospecific female. Finally, I dissect the importance of male ARTs on hybridization propensity and I attempt to quantify the reproductive costs that males' hybridization propensity inflicts among the tactics. The results imply a major role for C. splendens males in heterospecific reproductive interactions between the study species. Especially territorial males seem to be prone to hybridization, and the prevalence of hybridization is increased with a high availability of C. virgo females. Hybridization seems to be costly because there was high discordance between heterospecific mating frequency and observed numbers of hybrids. However, heterospecific courtship did not reduce conspecific mating success. The results also show that C. splendens males are able to adjust their level of heterospecific courtship according to the competitive environment as well as to the ART it follows. My thesis is a step towards understanding the causes of species reproductive interactions in wild populations.

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Is Decreased Frequency of Mating among Conspecifics a Cost of Sympatry in Salamanders?

Cited by 18 publications

References 4 publications

Reproductive Interference Between Animal Species

Reproductive Interference Between Animal Species

Asymmetric reproductive interference between two closely related spider mites: Tetranychus urticae and T. turkestani (Acari: Tetranychidae)

The effect of male-male competition and ornament size on mean and variance of courtship intensity towards heterospecific and conspecific females

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