Panorpa (Mecoptera: Panorpidae) Scorpionflies: Systems for Understanding Resource-Defense Polygyny and Alternative Male Reproductive Efforts

Thornhill, Randy

doi:10.1146/annurev.es.12.110181.002035

Cited by 173 publications

(149 citation statements)

References 98 publications

(113 reference statements)

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“…Like many scorpionflies, P. cognata is crepuscular and nocturnal in its mating activities (Thornhill 1981;Engqvist and Sauer 2003b). Females approach pheromone emitting (''calling'') males almost exclusively during the last hours prior to nightfall (Engqvist and Sauer 2003b).…”

Section: Mating Trialsmentioning

confidence: 99%

Nuptial gift consumption influences female remating in a scorpionfly: male or female control of mating rate?

Engqvist

2006

Evol Ecol

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In the scorpionfly Panorpa cognata, males provide females with saliva secretions as nuptial food gifts. Consequently, females derive material benefits and possibly also genetic benefits from multiple matings. Females therefore generally should have a high motivation to remate. Males, on the other hand, do not share this interest, which will generate a sexual conflict over remating interval, possibly leading to male adaptations that prevent females from remating with other males. In this study, I found that mated females were less prone to copulate than virgin females, despite female benefits of multiple matings. Further, I found that the remating interval was significantly longer if the first copulation was long compared to shorter matings. This effect does not entirely depend on copulation duration per se, but on the amount of saliva, that a female is consuming during copulation. These results suggest a mating-induced refractory period and can be interpreted as male manipulation of female remating behaviour mediated through substances in the nuptial gift. Alternatively, receiving large nuptial gifts may decrease the prospective direct fitness benefits from further copulations, and thus change optimal female remating rate. Furthermore, gift size has been shown to correlate with male nutritional condition, which may be an indicator of male genetic quality. Females may therefore benefit indirectly by not remating following copulations involving large saliva gifts. In this scenario, female remating interval would be an effect of cryptic female choice.

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Section: Mating Trialsmentioning

confidence: 99%

Nuptial gift consumption influences female remating in a scorpionfly: male or female control of mating rate?

Engqvist

2006

Evol Ecol

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“…173, pp. 376- fitness (Shuster and Wade 1991) or on individuals with low competitive status making the "best of a bad job" (based on status-dependent selection; Thornhill 1981;Gross 1996;Koprowski 2008;Taborsky et al 2008). Within social vertebrates, tactics employed might include being a dominant territorial breeder, satellite, roamer, or helper (e.g., Reyer et al 1986;Young et al 2007;Scantlebury et al 2008;Taborsky et al 2008) and depend on the individual's assessment of the relative inclusive fitness gains given its current environmental, social, physical, and physiological status (Clutton-Brock 1989).…”

Section: Introductionmentioning

confidence: 99%

Testosterone Levels in Dominant Sociable Males Are Lower than in Solitary Roamers: Physiological Differences between Three Male Reproductive Tactics in a Sociably Flexible Mammal

Schradin¹,

Scantlebury²,

Pillay³

et al. 2009

The American Naturalist

135

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abstract:The relative plasticity hypothesis predicts that alternative tactics are associated with changes in steroid hormone levels. In species with alternative male reproductive tactics, the highest androgen levels have usually been reported in dominant males. However, in sociable species, dominant males show amicable behaviors to gain access to females, which might conflict with high testosterone levels. We compared testosterone, corticosterone, and resting metabolic rate in male striped mice (Rhabdomys pumilio) following a conditional strategy with three different reproductive tactics: (i) philopatric group-living males, (ii) solitary-living roamers, (iii) dominant but sociable group-living territorial breeders. Philopatrics had the lowest testosterone but highest corticosterone levels, suggesting that they make the best of a bad job. Dominant territorial breeders had lower testosterone levels than roamers, which have a lower competitive status. Roamers had the highest testosterone levels, which might promote risky behavior, such as invading territories defended by territorial males. Roamers also had lower resting metabolic rates than either type of group-living males. Our results suggest that dominant males' testosterone levels reflect a trade-off between low testosterone amicable behavior and high testosterone dominance behavior.

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“…Although sexual conflict and female choice are different hypotheses explaining the function and the evolution of sexual traits involved in mating, they are not necessarily mutually exclusive (Thornhill 1981, Peretti & Willemart 2007. In fact, Allen & Simmons (1996) and Peretti & Willemart (2007) presented evidence that sexual coercion and selective female choice may occur simultaneously.…”

Section: Sexual Behaviormentioning

confidence: 99%

Body size, symmetry and courtship behavior of Dysdercus maurus distant (Hemiptera: Pyrrhocoridae)

Jorge¹,

Lomônaco²

2011

Neotrop. entomol.

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This study analyses the role of body size and symmetry in the sexual selection and courtship behavior of Dysdercus maurus Distant. Sexual conflicts signaled by coercive mating, female resistance, and precopulation fights illustrate the mating system. Male-female struggles were observed in all mating attempts. Females tried to reject males by pushing or running and even by vigorously shaking their bodies, in attempts to dislodge the male from their dorsum. In spite of sexual conflicts during courtship, females actively chose their mates based on morphological and behavioral traits. Larger males with more symmetrical tibiae and longer tarsi that are better copula imposers were more successful in sexual competition. Evidence is presented that sexual conflict and female mate choice should not be mutually excluded.

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Panorpa (Mecoptera: Panorpidae) Scorpionflies: Systems for Understanding Resource-Defense Polygyny and Alternative Male Reproductive Efforts

Cited by 173 publications

References 98 publications

Nuptial gift consumption influences female remating in a scorpionfly: male or female control of mating rate?

Nuptial gift consumption influences female remating in a scorpionfly: male or female control of mating rate?

Testosterone Levels in Dominant Sociable Males Are Lower than in Solitary Roamers: Physiological Differences between Three Male Reproductive Tactics in a Sociably Flexible Mammal

Body size, symmetry and courtship behavior of Dysdercus maurus distant (Hemiptera: Pyrrhocoridae)

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