Evolution; international journal of organic evolution, 2005
Although female multiple mating is ubiquitous in insects, its adaptive significance remains poorl... more Although female multiple mating is ubiquitous in insects, its adaptive significance remains poorly understood. Benefits to multiple mating can accrue via direct material benefits, indirect genetic benefits, or both. We investigated the effects of multiple mating in the decorated cricket, Gryllodes sigillatus, by simultaneously varying the number of times that females mated and the number of different males with which they mated, measuring aspects of female fecundity and elements of offspring performance and viability. Multiple matings resulted in enhanced female fitness relative to single matings when females mated with different partners, but not when females mated repeatedly with the same male. Specifically, polyandrous females produced significantly more offspring surviving to reproductive maturity than did monogamous females mating once or mating repeatedly with the same male. These results suggest that the benefit females gain from multiple mating is influenced primarily by gen...
Proceedings of The Royal Society B: Biological Sciences, 2005
Females of many species mate repeatedly throughout their lives, often with many different males (... more Females of many species mate repeatedly throughout their lives, often with many different males (polyandry). Females can secure genetic benefits by maximizing their diversity of mating partners, and might be expected, therefore, to forego matings with previous partners in favour of novel males. Indeed, a female preference for novel mating partners has been shown in several taxa, but the mechanism by which females distinguish between novel males and previous mates remains unknown. We show that female crickets (Gryllodes sigillatus) mark males with their own unique chemical signatures during mating, enabling females to recognize prior mates in subsequent encounters and to avoid remating with them. Because self-referent chemosensory cues provide females with a simple, but reliable mechanism of identifying individuals with whom they have mated without requiring any special cognitive ability, they may be a widespread means by which females across a broad range of animal mating systems maximize the genetic benefits of polyandry.
... SCOTT K. SAKALUK 1) and TRACIE M. IVY2,3) (Behavior, Ecology, Evolution and Systematics Secti... more ... SCOTT K. SAKALUK 1) and TRACIE M. IVY2,3) (Behavior, Ecology, Evolution and Systematics Section, Department of Biological Sciences, Illinois ... The difference between treatments in the proportion of males recaptured was not statistically signifi cant (Fisher exact test, p = 0.17 ...
In nature, female crickets often encounter males sequentially, choosing whether to mate with each... more In nature, female crickets often encounter males sequentially, choosing whether to mate with each male they find rather than selecting the most attractive male from a pool of available mates. Upon encountering a male, a female may base her decision to mate on a particular internal threshold or on a relative standard that takes into account the attractiveness of her previous mates. Here, we test whether the attractiveness of a female's previous mating partner influences her behaviour with respect to a second mate in the decorated cricket Gryllodes sigillatus. We measured both pre-and postcopulatory female mate choice as well as the effect that postcopulatory mating guarding by males had on females' postcopulatory behaviour. We showed that in both their first and second matings, pre-and postcopulatory mate choice are congruent, as females prefer to mate with, and accept more sperm from, attractive males. However, the outcome of pre-and postcopulatory choice does not depend on the attractiveness of a female's previous mate, suggesting that females employ a single standard upon which their mating decisions are based.
Male sagebrush crickets (Cyphoderris strepitans) permit females to engage in an unusual form of s... more Male sagebrush crickets (Cyphoderris strepitans) permit females to engage in an unusual form of sexual cannibalism during copulation: females feed on males' fleshy hind wings and ingest hemolymph oozing from the wounds they inflict. These wounds are not fatal, and normally only a portion of the hind wings are eaten at any one mating, so that mated males are not precluded from mating again. As a result, nonvirgin males have fewer material resources to offer females than do virgin males, such that females should be selected to preferentially mate with high-investment virgin males. We tested the hypothesis that female mating preferences favor males capable of supplying females with the highest material investment. Our results indicate that both female diet and opportunities for sexual cannibalism influence female mating behavior. Females maintained on a low-nutrient diet mounted males significantly sooner than females maintained on a high-nutrient diet, indicating that a female's overall nutrient intake may determine her propensity to mate. In addition, females were significantly more reluctant to mount and mate with males whose hind wings had been surgically removed and thus were incapable of providing females with a wing meal. Finally, females initially mated to dewinged males remated with winged males significantly sooner than females allowed to feed freely during their initial mating, resulting in cryptic female choice of investing males.
Although female multiple mating is ubiquitous in insects, its adaptive significance remains poorl... more Although female multiple mating is ubiquitous in insects, its adaptive significance remains poorly understood. Benefits to multiple mating can accrue via direct material benefits, indirect genetic benefits, or both. We investigated the effects of multiple mating in the decorated cricket, Gryllodes sigillatus, by simultaneously varying the number of times that females mated and the number of different males with which they mated, measuring aspects of female fecundity and elements of offspring performance and viability. Multiple matings resulted in enhanced female fitness relative to single matings when females mated with different partners, but not when females mated repeatedly with the same male. Specifically, polyandrous females produced significantly more offspring surviving to reproductive maturity than did monogamous females mating once or mating repeatedly with the same male. These results suggest that the benefit females gain from multiple mating is influenced primarily by genetic and not material benefits.
Although the effect of temperature on calling song of male crickets has been widely studied, its ... more Although the effect of temperature on calling song of male crickets has been widely studied, its influence on female mating behaviour remains largely unexplored. We examined the effect of varying temperature on female mating frequency in two cricket species (Gryllodes ...
Females of many species mate repeatedly throughout their lives, often with many different males (... more Females of many species mate repeatedly throughout their lives, often with many different males (polyandry). Females can secure genetic benefits by maximizing their diversity of mating partners, and might be expected, therefore, to forego matings with previous partners in favour of novel males. Indeed, a female preference for novel mating partners has been shown in several taxa, but the mechanism by which females distinguish between novel males and previous mates remains unknown. We show that female crickets (Gryllodes sigillatus) mark males with their own unique chemical signatures during mating, enabling females to recognize prior mates in subsequent encounters and to avoid remating with them. Because self-referent chemosensory cues provide females with a simple, but reliable mechanism of identifying individuals with whom they have mated without requiring any special cognitive ability, they may be a widespread means by which females across a broad range of animal mating systems maximize the genetic benefits of polyandry.
Evolution; international journal of organic evolution, 2005
Although female multiple mating is ubiquitous in insects, its adaptive significance remains poorl... more Although female multiple mating is ubiquitous in insects, its adaptive significance remains poorly understood. Benefits to multiple mating can accrue via direct material benefits, indirect genetic benefits, or both. We investigated the effects of multiple mating in the decorated cricket, Gryllodes sigillatus, by simultaneously varying the number of times that females mated and the number of different males with which they mated, measuring aspects of female fecundity and elements of offspring performance and viability. Multiple matings resulted in enhanced female fitness relative to single matings when females mated with different partners, but not when females mated repeatedly with the same male. Specifically, polyandrous females produced significantly more offspring surviving to reproductive maturity than did monogamous females mating once or mating repeatedly with the same male. These results suggest that the benefit females gain from multiple mating is influenced primarily by gen...
Proceedings of The Royal Society B: Biological Sciences, 2005
Females of many species mate repeatedly throughout their lives, often with many different males (... more Females of many species mate repeatedly throughout their lives, often with many different males (polyandry). Females can secure genetic benefits by maximizing their diversity of mating partners, and might be expected, therefore, to forego matings with previous partners in favour of novel males. Indeed, a female preference for novel mating partners has been shown in several taxa, but the mechanism by which females distinguish between novel males and previous mates remains unknown. We show that female crickets (Gryllodes sigillatus) mark males with their own unique chemical signatures during mating, enabling females to recognize prior mates in subsequent encounters and to avoid remating with them. Because self-referent chemosensory cues provide females with a simple, but reliable mechanism of identifying individuals with whom they have mated without requiring any special cognitive ability, they may be a widespread means by which females across a broad range of animal mating systems maximize the genetic benefits of polyandry.
... SCOTT K. SAKALUK 1) and TRACIE M. IVY2,3) (Behavior, Ecology, Evolution and Systematics Secti... more ... SCOTT K. SAKALUK 1) and TRACIE M. IVY2,3) (Behavior, Ecology, Evolution and Systematics Section, Department of Biological Sciences, Illinois ... The difference between treatments in the proportion of males recaptured was not statistically signifi cant (Fisher exact test, p = 0.17 ...
In nature, female crickets often encounter males sequentially, choosing whether to mate with each... more In nature, female crickets often encounter males sequentially, choosing whether to mate with each male they find rather than selecting the most attractive male from a pool of available mates. Upon encountering a male, a female may base her decision to mate on a particular internal threshold or on a relative standard that takes into account the attractiveness of her previous mates. Here, we test whether the attractiveness of a female's previous mating partner influences her behaviour with respect to a second mate in the decorated cricket Gryllodes sigillatus. We measured both pre-and postcopulatory female mate choice as well as the effect that postcopulatory mating guarding by males had on females' postcopulatory behaviour. We showed that in both their first and second matings, pre-and postcopulatory mate choice are congruent, as females prefer to mate with, and accept more sperm from, attractive males. However, the outcome of pre-and postcopulatory choice does not depend on the attractiveness of a female's previous mate, suggesting that females employ a single standard upon which their mating decisions are based.
Male sagebrush crickets (Cyphoderris strepitans) permit females to engage in an unusual form of s... more Male sagebrush crickets (Cyphoderris strepitans) permit females to engage in an unusual form of sexual cannibalism during copulation: females feed on males' fleshy hind wings and ingest hemolymph oozing from the wounds they inflict. These wounds are not fatal, and normally only a portion of the hind wings are eaten at any one mating, so that mated males are not precluded from mating again. As a result, nonvirgin males have fewer material resources to offer females than do virgin males, such that females should be selected to preferentially mate with high-investment virgin males. We tested the hypothesis that female mating preferences favor males capable of supplying females with the highest material investment. Our results indicate that both female diet and opportunities for sexual cannibalism influence female mating behavior. Females maintained on a low-nutrient diet mounted males significantly sooner than females maintained on a high-nutrient diet, indicating that a female's overall nutrient intake may determine her propensity to mate. In addition, females were significantly more reluctant to mount and mate with males whose hind wings had been surgically removed and thus were incapable of providing females with a wing meal. Finally, females initially mated to dewinged males remated with winged males significantly sooner than females allowed to feed freely during their initial mating, resulting in cryptic female choice of investing males.
Although female multiple mating is ubiquitous in insects, its adaptive significance remains poorl... more Although female multiple mating is ubiquitous in insects, its adaptive significance remains poorly understood. Benefits to multiple mating can accrue via direct material benefits, indirect genetic benefits, or both. We investigated the effects of multiple mating in the decorated cricket, Gryllodes sigillatus, by simultaneously varying the number of times that females mated and the number of different males with which they mated, measuring aspects of female fecundity and elements of offspring performance and viability. Multiple matings resulted in enhanced female fitness relative to single matings when females mated with different partners, but not when females mated repeatedly with the same male. Specifically, polyandrous females produced significantly more offspring surviving to reproductive maturity than did monogamous females mating once or mating repeatedly with the same male. These results suggest that the benefit females gain from multiple mating is influenced primarily by genetic and not material benefits.
Although the effect of temperature on calling song of male crickets has been widely studied, its ... more Although the effect of temperature on calling song of male crickets has been widely studied, its influence on female mating behaviour remains largely unexplored. We examined the effect of varying temperature on female mating frequency in two cricket species (Gryllodes ...
Females of many species mate repeatedly throughout their lives, often with many different males (... more Females of many species mate repeatedly throughout their lives, often with many different males (polyandry). Females can secure genetic benefits by maximizing their diversity of mating partners, and might be expected, therefore, to forego matings with previous partners in favour of novel males. Indeed, a female preference for novel mating partners has been shown in several taxa, but the mechanism by which females distinguish between novel males and previous mates remains unknown. We show that female crickets (Gryllodes sigillatus) mark males with their own unique chemical signatures during mating, enabling females to recognize prior mates in subsequent encounters and to avoid remating with them. Because self-referent chemosensory cues provide females with a simple, but reliable mechanism of identifying individuals with whom they have mated without requiring any special cognitive ability, they may be a widespread means by which females across a broad range of animal mating systems maximize the genetic benefits of polyandry.
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