Elevated testosterone reduces choosiness in female dark–eyed juncos (<i>Junco hyemalis</i>): evidence for a hormonal constraint on sexual selection?

McGlothlin, Joel W.; Neudorf, Diane L. H.; Casto, Joseph M.; Nolan, Val; Ketterson, Ellen D.

doi:10.1098/rspb.2004.2741

Cited by 64 publications

(35 citation statements)

References 49 publications

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“…They have been explored mainly in the field of sexual selection (e.g. Clotfelter et al 2004;McGlothlin et al 2004), but they are probably important in other contexts of functional differentiation of males and females (e.g. Temeles et al 2000).…”

Section: Discussionmentioning

confidence: 99%

“…In contrast to the amount of work investigating the relations between behavioural phenotypes within honeybee workers, correlations across castes or sexes have not been addressed (but see Giray & Robinson 1996), even though male-female correlations are of general importance to understand the evolution of animal behaviour (Price & Langen 1992;McGlothlin et al 2004). Male honeybees (drones) serve an exclusively reproductive function.…”

Section: Introductionmentioning

confidence: 99%

“…Many different aspects of foraging behaviour Waddington et al 1998;Pankiw & Page 1999;Fewell & Page 2000) have changed in concert with seemingly unrelated behavioural phenotypes, such as behavioural maturation (Calderone & Page 1996;Pankiw & Page 2001) and learning behaviour (Scheiner et al 2001a, b). This suite of behavioural correlations is also reflected in racial differences and in unselected honeybee workers (Pankiw & Page 2000;Pankiw 2003), and thus it constitutes a general behavioural syndrome (Sih et al 2004).In contrast to the amount of work investigating the relations between behavioural phenotypes within honeybee workers, correlations across castes or sexes have not been addressed (but see Giray & Robinson 1996), even though male-female correlations are of general importance to understand the evolution of animal behaviour (Price & Langen 1992;McGlothlin et al 2004). Male honeybees (drones) serve an exclusively reproductive function.…”

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Male behavioural maturation rate responds to selection on pollen hoarding in honeybees

2006

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Division of labour in social insect colonies relies on behavioural functional differentiation (specialization) of individuals with similar genomes. However, individual behavioural traits do not evolve independently of each other (behavioural syndromes). A prime example is the suite of behavioural differences in honeybee workers that has evolved in response to bidirectional selection on pollen hoarding of honeybee colonies (pollen-hoarding syndrome). More generally, these differences reflect functional differentiation between nectar and pollen foragers. We demonstrate here that this pollen-hoarding syndrome extends to drones. Similar to what has been shown in workers, drones from the high-pollen-hoarding strain had a higher locomotion activity after emergence, and they initiated flight earlier than did males derived from the low-pollen-hoarding strain, with hybrids intermediate. However, these two behavioural traits were unlinked at the individual level. We also found that social environment (the colony) affects the age at which drones initiate flight. The indirect selection responses of male behaviour suggest that male and worker evolution are not independent and may constrain each other's evolution. Furthermore, we identified three distinct peaks in the probability of flight initiation over the course of the experiment and a decreased phenotypic variability in the 'hybrid' males, contrary to quantitative genetic expectations.Social insects owe much of their evolutionary success to the coordinated action of behaviourally specialized members of their colonies (Oster & Wilson 1978; Winston 1987;Hölldobler & Wilson 1990). Division of labour is a hallmark of social evolution (Beshers & Fewell 2001), and among honeybee workers, it is mainly determined by age and genetic effects (Winston 1987). To promote individual specialization, the response thresholds to different task stimuli should vary independently among individuals (Beshers & Fewell 2001). This seems not to be the case: honeybees show well-established behavioural differences among races that extend to multiple behavioural phenotypes, as well as to morphology and life history (Winston 1987). Similar multiple behavioural phenotypes in honeybees are also correlated at the individual level (Page & Erber 2002;Pankiw 2003;Scheiner et al. 2004), indicating their evolution as behavioural syndromes (array of correlated behavioural characteristics: Sih et al. 2004). Linked sets of behavioural traits may have arisen through adaptation in certain contexts (Amdam et al. 2004), but the correlation among behavioural traits may constrain the division of labour in social insects, and behavioural optimization in general (Price & Langen 1992;Sih et al. 2004 One of the best-studied examples of behavioural syndromes in insects is the behavioural differentiation among workers of two strains of honeybees that have been bidirectionally selected over multiple generations for different amounts of pollen stored in their nests . Many different aspects of foraging behaviour Wadd...

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Male behavioural maturation rate responds to selection on pollen hoarding in honeybees

2006

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“…It has not been well studied, however, whether these changes in receptive behavior are accompanied by changes in the range of mate signals that female will accept. In one recent study, testosterone-treated female dark-eyed juncos (Junco hyemalis) were less discriminating in their mate choices than control females (McGlothlin et al, 2004). Although there are few hormone manipulation studies that provide empirical support for these predictions, it has been shown that variation in mate choice decisions can be associated with changes in reproductive stage (Lea et al, 2000;Bosch and Boyero, 2004;, and that, in a few anuran species, changes in reproductive stage are associated with changes in hormonal state (Licht et al, 1983;Pierantoni et al, 1984;Iela et al, 1986;Itoh and Ishii, 1990;Harvey et al, 1997;Medina et al, 2004;.…”

Section: Introductionmentioning

confidence: 99%

Hormonal state influences aspects of female mate choice in the Túngara Frog (Physalaemus pustulosus)

Lynch

Crews

Ryan

et al. 2006

Hormones and Behavior

107

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Females alter their mate choices as they transition through different reproductive stages; however, the proximal mechanisms for such behavioral fluctuation are unclear. In many taxa, as females transition through different reproductive stages, there is an associated change in hormone levels; therefore, we examined whether fluctuation in hormone levels serves as a proximal mechanism for within-individual variation in mate choice in female túngara frogs (Physalaemus pustulosus). We manipulated hormone levels of females by administering 0, 10, 100, 500 or 1000 IU of human chorionic gonadotropin (HCG), which is a ligand for luteinizing hormone (LH) receptors and will therefore cause increased gonadal hormone production. Phonotaxis assays were conducted to measure three aspects of mate choice behavior before and after HCG administration; receptivity (response to a conspecific mate signal), permissiveness (response to a signal that is less attractive than conspecific signals) and discrimination (ability to discern signal differences). The probability of response to a conspecific and an artificial hybrid signal significantly increased at the highest HCG doses. The difference in mean response time between pre-and post-HCG tests was significantly different for both the receptivity and permissiveness tests among the five doses. Increased permissiveness, however, was not due to decreased discrimination because females could discriminate between calls even at the highest HCG doses. These hormonal manipulations caused the same behavioral pattern we reported in females as they transitioned through different reproductive stages (Lynch, K.S., Rand, A.S., Ryan, M.J., Wilczynski, W., 2005. Plasticity in female mate choice associated with changing reproductive states. Anim. Behav. 69, 689-699), suggesting that changes in hormone levels can influence the female's mate choice behavior.

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“…In many species, testosterone in females is also strongly correlated with territorial aggression. 38,39,40 Do aggressive responses depend on STI?…”

Section: Do Baseline T and Aggressive Behavior Covary Among Individuals?mentioning

confidence: 99%

Testosterone and Heterospecific Aggression in the Adult Eastern Bluebird (Sialia sialis) During the Nestling Period

CV¹

2016

IJAWB

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Conspecific competition is assumed to exert stronger selection than heterospecific competition on the aggressive behavior and its underlying physiology in birds. We tested the hypothesis that hormone-behavior interaction between testosterone and aggression may also be shaped by severe heterospecific competition among secondary cavity nesters. Adult Eastern Bluebirds (n=34) were exposed to three challenge conditions that simulated territorial intrusions (STI) by heterospecific (House Sparrow) and conspecific using live and stuffed decoys with their respective playback vocalizations. Eastern Blue birds were responsive to simulated territorial intrusions (STIs) by Conspecific and heterospecific late in the nesting cycle. The aggressive response elicited from a heterospecific STI was muted compared to honspecific STI. Overall, highly aggressive individuals had slightly greater mean testosterone concentrations than individuals with low aggression scores. Baseline T and aggression were positively correlated for all STI conditions, but the relationship was strongest for the live heterospecific decoy. Furthermore, the live heterospecific decoy elicited a stronger aggressive response than the stuffed decoy suggesting that other cues produced by the living bird, in addition to the auditory and visual cues provided influenced individual responses to a challenger.We conclude: a. Conspecific competitors exert stronger selective pressure on the aggressive behavior than Heterospecific competitors.b. Stuffed decoys may not accurately reflect the relationship between hormones and behavior in an individual.

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Elevated testosterone reduces choosiness in female dark–eyed juncos (Junco hyemalis): evidence for a hormonal constraint on sexual selection?

Cited by 64 publications

References 49 publications

Male behavioural maturation rate responds to selection on pollen hoarding in honeybees

Male behavioural maturation rate responds to selection on pollen hoarding in honeybees

Hormonal state influences aspects of female mate choice in the Túngara Frog (Physalaemus pustulosus)

Testosterone and Heterospecific Aggression in the Adult Eastern Bluebird (Sialia sialis) During the Nestling Period

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