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1.
Rafael Márquez 《Behavioral ecology and sociobiology》1993,32(4):283-291
Summary One population of the midwife toad species Alytes obstetricans and one of A. cisternasii were studied in Spain for two consecutive reproductive seasons. Males that were most successful at hatching a high proportion of their clutch did not obtain more matings. On the other hand, in both species larger body size conferred a significant reproductive advantage on males. These results are explained mainly by the increased number of mates obtained by larger males, probably as a result of female choice. The selection gradients for body size in males (regressions of reproductive success on body size) were not significantly different within species between years nor between species within the same period of time. Hatching success (proportion of the eggs hatched) was not correlated with male body size in A. obstetricans. Hatching success in A. cisternasii was weakly negatively correlated with male body size in 1988. 相似文献
2.
Adam Felton Ross A. Alford Annika M. Felton Lin Schwarzkopf 《Behavioral ecology and sociobiology》2006,59(6):786-795
We examined multiple mate choice criteria in Cophixalus ornatus, a terrestrial breeding, microhylid frog. Mate choice consisted of three stages: mate attraction (male calling), courtship
(male behavior between the call site and the nest), and nest site selection by the female. For male C. ornatus, the possession of a call with low dominant frequency relative to calling neighbors increased the probability that they would
attract females. Dominant frequency was negatively correlated with age independent of male mass and snout vent length. When
escorting the female from the call site to their nest, males traveled along more convoluted paths than when returning to the
nest alone. The convolution of the path was, therefore, considered an aspect of courtship. Females released eggs into nests
with structural characteristics typical of nests constructed by older males. Thus, females increased their chances of locating
an acceptable nest by preferentially approaching males with lower dominant frequencies. This study is the first to demonstrate
that age, independent of mass or snout-vent length, can influence call characteristics in anurans, and it is also the first
to demonstrate the importance of male age to female mate choice in an amphibian. 相似文献
3.
Kathryn B. McNamara Therésa M. Jones Mark A. Elgar 《Behavioral ecology and sociobiology》2007,61(8):1177-1184
Male copulation experience may have a profound impact on female reproductive success if male reproductive investment declines
over consecutive copulations and if females are unlikely to re-mate. Male reproductive investment is particularly interesting
in lepidopterans because males produce dimorphic sperm: a fertilizing (eupyrene) and a non-fertilising (apyrene) sperm. In
two experiments, we explored the lifetime reproductive investment of male almond moths, Cadra cautella (also known as Ephestia cautella) and examined its influence on female reproductive success. In the almond moth, females re-mate infrequently and males transfer
sperm in a spermatophore. Attached to the spermatophore is a large chitinous process, the function of which is unknown. One
group of males were permitted consecutive copulations with virgin females and the amount of sperm and size of the spermatophore
transferred were compared for all females. We found that the number of both eupyrene and apyrene sperm per ejaculate decreased
with his increased mating frequency, while the size of the spermatophore process decreased dramatically after the male’s first
copulation. In a second experiment, we allowed males to mate with females throughout their lives and then compared female
fecundity and fertilisation success. We found no obvious decrease in female fecundity and fertilisation success with increased
male copulation experience, despite the likely reduction in male gametic investment. We discuss potential explanations for
the development of this enlarged and elaborate first spermatophore of male almond moths given that it confers no clear fitness
advantage to females. 相似文献
4.
Even though females prefer particular components of a male display, their preferences may not be expressed during mate choice. Here, we quantified female preference patterns in the frog Crinia georgiana for call rate, pulse number and dominant frequency using two-speaker trials. Females typically chose signals emitted at a higher rate, with more pulses (when variation was extreme) and with an average dominant frequency. The results for pulse number and call rate agree with a previous field study which found that these two call components explained significant variation in male mating success. In contrast, the strong preferences for average dominant frequencies detected here disagree with the previous field study which failed to find any relationship between dominant frequency and male mating success. To explain the discrepancy we investigated whether the patterns of female preference for dominant frequency changed when another property, call rate, was varied simultaneously. Most females chose the call with an average dominant frequency when offered a choice between a call with an average dominant frequency and call rate or a non-average dominant frequency (±2 SD) and high call rate. When the differences in dominant frequency were reduced (±1 SD), females showed no clear preference for either signal. Accordingly, female preference patterns for one call component can vary with the expression of another. These results do not explain why dominant frequency did not account for any variation in male mating success under field conditions.Communicated by T. Beschlitz 相似文献
5.
Engelhardt A Fischer J Neumann C Pfeifer JB Heistermann M 《Behavioral ecology and sociobiology》2012,66(1):121-134
Primates are unusual in that many females display sexual signals, such as sex skin swellings/colorations and copulation calls,
without any sex role reversal. The adaptive function of these signals remains largely unclear, although it has been suggested
that they provide males with information on female reproductive status. For sex skin swellings, there is increasing evidence
that they represent a graded signal indicating the probability of ovulation. Data on the functional significance of copulation
calls are much scarcer. To clarify the information content of such calls, we recorded copulation calls in wild long-tailed
macaques (Macaca fascicularis) and analysed the structure of these calls during the ovarian cycle. Specifically, we correlated selected call parameters
with the female oestrogen to progestogen ratio (obtained from faecal samples), which are known to be elevated during the female's
fertile phase. In addition, we ran a general linear mixed model for these call parameters, testing factors (cycle phase, occurrence/absence
of ejaculation, male dominance status, occurrence/absence of mate guarding) which potentially influence female copulation
calls in primates. Our results show that copulation calls of female long-tailed macaques signal mating outcome and rank of
the mating partner, but not female reproductive status. They also show for the first time on primates that copulation calls
can convey information on whether a female is mate guarded or not. We suspect that the function of these calls is manipulation
of male mating and mate-guarding behaviour and that in this way the degree of sperm competition and ultimately male reproductive
success is influenced. 相似文献
6.
The katydid Neoconocephalus triops exhibits in North America substantial developmental plasticity of male mating calls. The AM rate of the summer calls is significantly
faster than that of the winter calls at the same temperature. In the tropics, where N. triops originated, males express only the fast summer-call phenotype. We tested two alternative hypotheses: (1) call plasticity
in the population from North America evolved in response to selection by female preference after N. triops colonized North America, or (2) call plasticity evolved before N. triops expanded into North America and its expression in the novel environment led to adaptive change of female preferences. First,
we tested whether call plasticity was present in tropical populations of N. triops. Tropical males expressed the winter-call phenotype when reared under winter conditions, indicating that call plasticity
did not evolve in response to temperate climates. Second, we compared female preferences among temperate and tropical populations.
We found that the temperature dependence of preferred AM rate was significantly steeper in temperate N. triops than in a tropical population of N. triops. Third, we compared temperature dependence of female preference of the N. triops populations to three Neoconocephalus species without call plasticity. Only temperate N. triops had significantly steeper temperature dependence than the other species. This steeper temperature dependence matched female
preference to the fast summer call at high temperatures and to the slow winter call at low temperatures in temperate populations.
These results support the hypothesis that female preference changed in N. triops in North America to compensate for the plasticity of male calls. 相似文献
7.
Toby J. Hibbitts Martin J. Whiting Devi M. Stuart-Fox 《Behavioral ecology and sociobiology》2007,61(8):1169-1176
Many species possess multiple sexually dimorphic traits, which incorporate different sensory modalities (e.g., acoustic, olfactory
and visual), although their relative roles in sexual selection and in determining reproductive success are still poorly understood
for most taxa. We assessed the role of multiple male traits, including one acoustic (dominant call frequency) and one visual
(yellow throat patch) trait, in residency advertisement, contest behavior, and breeding success in barking geckos (Ptenopus garrulus garrulus). We show that male barking geckos maintain largely exclusive home ranges, with a trend for larger males to maintain larger
home ranges. We also show that larger males have a lower dominant calling frequency. When aggressive behavior was elicited
in the field using a recorded call of average frequency, resident males with low frequency calls were more likely to respond
aggressively and charge the speaker compared to males with high frequency calls. However, body size and small relative throat
patch size, rather than call frequency, were the best predictors of overall aggressiveness. Body size was also the best predictor
of whether males bred. We suggest that call frequency in this crepuscular species constitutes an effective long-range signal
of body size, used by males for remote rival assessment and to advertise home range boundaries in low-light environments. 相似文献
8.
Maria Clara P. Amorim José Miguel Simões Vitor C. Almada Paulo J. Fonseca 《Behavioral ecology and sociobiology》2011,65(4):707-716
Signal attributes should show different degrees of variability depending on the information to be conveyed. Species identity
is usually associated with stereotyped features of a signal, whereas other types of information such as individual quality
and motivation are associated with signal plasticity. Lusitanian toadfish males form aggregations during the breeding season
and emit a tonal advertisement call (the boatwhistle) to attract mates to their nests. We test the hypothesis that the boatwhistle
can convey information both on individual identity and motivation by checking how signal parameters vary with time. We study
how the physical (tide level) and social (calling alone or in a chorus) environments and male calling rate affect this advertisement
signal and how all these external and internal factors (environment, social and male motivation) blend to modulate the Lusitanian
toadfish’s advertisement call. Boatwhistles of each male were very stereotyped in short periods of time (minutes), but intra-male
signal variability greatly increased in a longer time scale (days). Nevertheless, significant differences among males could
still be found even in a long time scale. Pulse period was the acoustic feature that most contributed to discriminate among
males. Tide level and male calling rate modulated boatwhistle characteristics, and there was a differential effect of tide
on call attributes depending on male calling rate. Social acoustic environment only affected calling rate. These results suggest
that inter-individual differences in call characteristics and call plasticity may mediate both male–male assessment and mate
choice. 相似文献
9.
Tagide N. deCarvalho Daniel J. Fergus Rayna C. Bell Kerry L. Shaw 《Behavioral ecology and sociobiology》2012,66(9):1333-1340
In many organisms, mating behavior occurs at a particular time of day, which may be important for avoiding mate competition or interspecific mating. Crickets of the Hawaiian genus Laupala exhibit an unusually protracted courtship in which males produce a series of nuptial gifts prior to the species-typical time of mating. Mating time is one of several rhythmic behaviors that have diverged among closely related Laupala species, which exhibit an extremely high speciation rate. Mating rhythm may reflect direct selection on male and/or female sexual receptivity or the pleiotropic consequence of selection on other rhythmic behaviors. To examine the role of sexual rhythmicity in Laupala cerasina, we characterized the time boundaries or “circadian gate” of courtship and mating, as well as female phonotactic response to male song. We also examined which sex is responsible for mating rhythmicity by phase-shifting males relative to the female photophase. Our results demonstrate that mating behavior is gated by the end of the light phase. Time limits to female mating receptivity were not observed and thus male rhythm alone appears to be responsible for the timing of mating. Furthermore, when courtship is initiated later in the day, males produce fewer nuptial gifts and increase nuptial gift production rate while delaying mating, suggesting that the number of gifts a female receives is important to male reproductive success. 相似文献
10.
Fleur E. Champion de Crespigny Nina Wedell 《Behavioral ecology and sociobiology》2007,61(8):1229-1235
The maternally inherited bacterium Wolbachia pipientis generates strong reproductive incompatibilities between uninfected females and infected males (cytoplasmic incompatibility),
significantly reducing both female and male reproductive success. Such fitness costs are thought to place selective pressure
on hosts to evolve pre-copulatory preferences for mating with compatible mates, thereby enabling them to avoid the reproductive
incompatibilities associated with Wolbachia. Therefore, uninfected females are predicted to prefer mating with uninfected males, whereas infected males are predicted
to prefer mating with infected females. Despite these predictions, previous investigations of pre-copulatory mate preferences
in Wolbachia-manipulated Drosophila have not found evidence of female preference for uninfected or compatible males. However, none of these studies utilised
a design where focal individuals are provided with a simple choice in a relatively non-competitive situation. We examined
both female and male pre-copulatory mate preference based on mate infection status in Drosophila simulans and D. melanogaster using simple choice assays involving between 30–50 replicates per treatment. Although we found no evidence of female pre-copulatory
mate preferences in either species, male D. simulans exhibited some preference for mating with females of the same infection status. However, this preference was not evident
when we repeated the experiment to confirm this finding. Consequently, we conclude that neither male nor female D. melanogaster and D. simulans exhibit significant Wolbachia-associated pre-copulatory mate preferences. 相似文献
11.
Male seahorses (genus Hippocampus) provide all post-fertilization parental care, yet despite high levels of paternal investment, these species have long been
thought to have conventional sex roles, with female mate choice and male–male competition. Recent studies of the pot-bellied
seahorse (Hippocampus abdominalis) have shown that sex-role reversal occurs in high-density female-biased populations, indicating that male mating preferences
may lead to sexual selection on females in this species. Egg size, egg number, and offspring size all correlate positively
with female body size in Hippocampus, and by choosing large mating partners, male seahorses may increase their reproductive success. While male brood size is
also positively correlated with body size, small H. abdominalis males can carry exceptionally large broods, suggesting that the fecundity benefits of female preference for large partners
may be limited. We investigated the importance of body size in reproductive decisions of H. abdominalis, presenting focal individuals of both sexes with potential mating partners of different sizes. Mating preferences were quantified
in terms of time spent courting each potential partner. Male seahorses were highly active throughout the mate-choice trials
and showed a clear behavioral preference for large partners, while females showed significantly lower levels of activity and
equivocal mating preferences. The strong male preferences for large females demonstrated here suggest that sexual selection
may act strongly on female body size in wild populations of H. abdominalis, consistent with predictions on the importance of female body size for reproductive output in this species.
An erratum to this article can be found at 相似文献
12.
Sex-specific interests over the maximization of reproductive success lead to an inter-sexual conflict over the optimal mating system in a species. Traditionally, the outcome of this inter-sexual conflict has been studied from the male perspective but it also depends on female mating strategies, such as manipulating the temporal distribution of sexual activity, advertisement, and mate choice. We used a small nocturnal primate, the gray mouse lemur (Microcebus murinus) to determine the relative importance of female mating strategies on the outcome of this conflict in a species where females are solitary during their activity period. We studied their mating behavior over three consecutive annual mating seasons and determined the genetic relationships among more than 300 study animals to quantify individual reproductive success. We found that most females were receptive asynchronously. Females did not exhibit any obvious direct mate choice, probably due to a highly male-biased operational sex ratio and the corresponding costs of choosiness. However, females exercised indirect choice for multiple matings. They mated with 1–7 males up to 11 times during their single night of receptivity. As a result, mixed paternity was common but heavier males sired more offspring, meaning that indirect female choice for superior males cannot be excluded. Females exhibited a mixed mating strategy, avoiding costly direct mate choice but still counteracting male efforts to monopolize mating, successfully increasing genetic variability among offspring. Thus, females had a major influence on the outcome of the inter-sexual conflict despite male monopolization attempts.Communicated by J. Setchell 相似文献
13.
Sequences of the advertisement calls produced by male Nathusius’ pipistrelles (Pipistrellus nathusii) during the autumn mating period were recorded from individuals at two separate sites in Antrim, Northern Ireland, in August
2004. Several male roosts were found at these sites in close proximity to a single maternity roost, each containing approximately
200 adult females and their young. Analysis of measured parameters of four identified call types revealed that there were
significant differences in call structure between sites and between individuals. Playback experiments, performed outside the
adult female and juvenile roost sites, comprised of experimental advertisement call sequences of P. nathusii, Pipistrellus pygmaeus and Pipistrellus pipistrellus and control sound recorded without bats present (silence). Response was measured by simultaneously recording ultrasound during
playbacks and counting the number of echolocation pulses identified as those of P. nathusii above a predetermined amplitude threshold. Significantly greater numbers of P. nathusii echolocation pulses were recorded during playback of male P. nathusii advertisement calls than during playback of congeners’ advertisement calls and control sound. The number of echolocation
pulses recorded was similar during playback of P. pipistrellus and P. pygmaeus advertisement calls and silence. We suggest that, due to call complexity, male P. nathusii advertisement calls should be classified as ‘song’. Species-specificity and individual variation suggests that the songs
of male P. nathusii have the potential to play a role in mate attraction and mate assessment. 相似文献
14.
Summary In this study, we combine both field and laboratory experiments to address the effects of female preference for certain call characteristics on a large-male mating advantage in the treefrog H. chrysoscelis. In laboratory-choice experiments, females always chose the call with the lower fundamental frequency when call rate and call intensity were held constant and the difference in frequency between the two calls was 15%. The lower frequency call was preferred by 8 out of 12 females when the difference in fundamental frequency was 7.4%. These results are consistent with field comparisons of the size of unmated males calling within 2 m of a mated male: Male body size was negatively correlated with fundamental frequency and the greater the size difference, the more likely that the larger male mated. In field choice experiments, females preferred males with higher call rates. Since size differences between males used in this experiment averaged only 2.3 mm, we would not expect the fundamental frequency of a male's call to be the best predictor of mating success. Laboratory results demonstrated that call rate could override female preference for the low frequency call over the high frequency call, while intensity could at least dilute this preference. However, individual males in the field varied both call rate and the call intensity as perceived by the female. We suggest that the interaction between call rate, male size and mating success should be studied further through the use of field-choice experiments. 相似文献
15.
A comprehensive understanding of sexual selection requires knowledge of the traits and mechanisms responsible for increasing a male’s paternity share (proportion of progeny sired) relative to that of other males mating with the same female. In this study we manipulated by starvation the expression of traits that might influence male paternity share in Tribolium castaneum. We then conducted experiments to examine how male starvation affects male performance during sequential episodes of sexual selection from mating to progeny production, and investigated female control over specific stages by using live vs dead females. Comparison of starved vs fed males revealed that T. castaneum females have control over spermatophore transfer during mating, as live females rejected inseminations by starved (“low quality”) males. None of the measured male copulatory behaviors (leg-rubbing frequency, asymmetry, and percent of time spent rubbing) affected the probability of successful insemination, but the last two were positively associated with male paternity share. Spermatophore positioning within the female reproductive tract was not affected by male treatment (starved/fed), by female treatment (live/dead), or by male copulatory behaviors. Starvation, however, had a dramatic effect on male reproductive physiology, decreasing both accessory gland size and total number of sperms transferred (but not sperm viability in seminal vesicles). In addition, females who mated to starved males stored fewer sperms in their spermathecae, which, together with decreased ejaculate size, may explain the reduced paternity share of starved males compared to fed males. This study elucidates some cryptic mechanisms influencing male reproductive success and aids our understanding of trait evolution through sexual selection. 相似文献
16.
Squid typically display considerable intra-specific plasticity in size and age-at-maturity in response to ambient environmental conditions, yet little is known of the mechanisms driving these variations. We examined the intra-specific variability in Nototodarus gouldi reproductive traits to determine patterns of energy allocation between somatic and reproductive processes over short temporal scales. Females caught during the cool months of May and July were larger, had slower lifetime growth, lower gonad investment, and better somatic condition than females caught during the warmer months, suggesting a trade-off between gonad investment and somatic condition in females. On the other hand, males showed a tight coupling between somatic condition and gonad investment for most months, with increases in somatic and gonad tissue occurring concurrently. In male squid, an increase in lifetime growth rate was coupled with an increase in the relative weights of somatic and reproductive structures, whereas in females, percent increase in body weight per day was correlated only with gonad development. Patterns of repro-somatic investment in mature females had implications for spawning strategies, since female squid with higher levels of gonad investment apparently released batches of eggs together as a group, regardless of body size, whereas females with low gonad investment possibly spawned their eggs independently of one another. In terms of life-history theory, male squid were able to respond rapidly to environmental fluctuations without compromising either the gonad or the soma. However, although mature females did not appear to respond as quickly to ambient conditions, female squid possibly produced two different reproductive strategies, possibly to maximise offspring survival in either a stable or a variable environment. It seems from our study that monthly variations in ambient conditions may have large effects on life-history strategies.Communicated by M.S. Johnson, Crawley 相似文献
17.
In a variety of taxa, male reproductive success is positively related to the expression of costly traits such as large body
size, ornaments, armaments, and aggression. These traits are thought to improve male competitive ability and, thus, access
to limited reproductive resources. Females of many species also express competitive traits. However, we know very little about
the consequences of individual variation in competitive traits and the mechanisms that regulate their expression in females.
Consequently, it is currently unclear whether females express competitive traits owing to direct selection or as an indirect
result of selection on males. Here, we examine females of a mildly dimorphic songbird (Junco hyemalis) to determine whether females show positive covariance in traits (morphology and behavior) that may be important in a competition.
We also examine whether trait expression relates either to testosterone (T) in terms of mechanism or to reproductive success
in terms of function. We found that larger females were more aggressive and that greater ability to produce T in response
to a physiological challenge consisting of a standardized injection of gonadotropin-releasing hormone predicted some measures
of female body size and aggression. Finally, we found that aggressive females had greater reproductive success. We conclude
that T may influence female phenotype and that females may benefit from expressing a competitive phenotype. We also suggest
that the mild dimorphism observed in many species may be due in part to direct selection on females rather than simply a correlated
response to selection in males. 相似文献
18.
Carlos César Martínez-Rivera H. Carl Gerhardt 《Behavioral ecology and sociobiology》2008,63(2):195-208
Senders and receivers influence dynamic characteristics of the signals used for mate attraction over different time scales.
On a moment-to-moment basis, interactions among senders competing for a mate influence dynamic characteristics, whereas the
preferences of receivers of the opposite gender exert an influence over evolutionary time. We observed and recorded the calling
patterns of the bird-voiced treefrog Hyla avivoca to assess how the dynamic characters of calls vary during interactions among groups of males in a chorus. This question was
also addressed using playback experiments with males. Playback experiments with females showed how changes in dynamic call
properties are likely to affect male mating success. Frogs calling in pairs, groups, or in response to playbacks produced
longer calls than did isolated males. During call overlap, males often increased the duration of the silent interval (gaps)
between the pulses of their calls so that the pulses of the calls of two neighbors interdigitated. This change resulted in
increased variability of pulse rate, a traditionally static acoustic property; however, males also produced high proportions
of non-overlapped calls in which variability in pulse rate was low and had species-typical values. Females preferred long
calls to short- and average-duration calls, and non-overlapped calls to overlapped calls. Given a choice between pairs of
overlapped calls, females preferred pairs in which the proportion of overlap was low and pairs in which the pulses of such
calls interdigitated completely. The observed patterns of vocal competition thus reflect the preferences of conspecific females,
which have influenced the evolution of the calling behavior of H. avivoca.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. 相似文献
19.
Mating effort, the energy exerted in finding and persuading a member of the opposite sex to mate, may be influenced by how frequently potential mates are encountered. Specifically, males that frequently encounter females may reduce calling effort and be less eager to mate than males that infrequently encounter females. An experiment was set up to test this hypothesis, using the tettigoniid Requena verticalis. We examined the song structure, calling activity and mating propensity of individual males exposed to one of five different encounter rates with virgin females. Song structure and calling effort were significantly altered by an encounter with a female. After an encounter, males significantly increased chirp rate and decreased variability in interchirp interval. Encounters also stimulated a male to call and to continue to call for up to two hours. The elapsed time since mating affected mating propensity but not calling activity. Mating propensity asymptotically increased to reach a maximum by day 17 since last mating. However, neither the frequency of encounters, nor the number of previous encounters experienced by a male, influenced calling activity or the propensity of a male to mate. The significance of changes in song structure and calling activity following an encounter, and of increasing male mating propensity over time, are discussed.
Correspondence to: G.R. Allen 相似文献
20.
Laura K. Sirot Norene A. Buehner Anthony C. Fiumera Mariana F. Wolfner 《Behavioral ecology and sociobiology》2009,63(10):1505-1513
In many species, seminal fluid proteins (SFPs) affect female post-mating behavioral patterns, including sperm storage, egg
laying, feeding, and remating. Yet, few studies have investigated the patterns of allocation, depletion, and replenishment
of SFPs in male animals, despite the importance of these proteins to male and female reproductive success. To investigate
such SFP dynamics, it is necessary to have a sensitive method for quantifying SFP levels in males and mated females. We developed
such a method by adapting the enzyme-linked immunosorbent assay (ELISA) using anti-SFP antibodies. Here, we first use two
Drosophila melanogaster SFPs (ovulin and sex peptide) to demonstrate that ELISAs provide accurate measures of SFP levels. We find that, consistent
with previous data from Western blotting or immunofluorescence studies, levels of both ovulin and sex peptide decline in the
mated female with time since mating, but they do so at different rates. We then use ELISAs to show that males become depleted
of SFPs with repeated matings, but that previously mated males are able to transfer “virgin” levels of SFPs after 3 days of
sexual inactivity. Finally, we demonstrate that ELISAs can detect SFPs from wild-caught D. melanogaster males and, thus, potentially can be used to track mating patterns in the wild. This method of measuring SFP dynamics can
be used in a wide range of species to address questions related to male reproductive investment, female mating history, and
variation in female post-mating behavioral changes.
Norene A. Buehner and Anthony C. Fiumera contributed equally to this work. 相似文献