Sexual Selection for Increased Male Courtship and Acoustic Signals and Against Large Male Size at Sharp-Tailed Grouse Leks

Gratson, Michael W.

doi:10.1111/j.1558-5646.1993.tb02125.x

Cited by 14 publications

(3 citation statements)

References 40 publications

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“…Hoglund et al (1990) also reported that females that copulated more than once were often individuals associated with a disturbed mating. This trend to remate after a disturbed mating was also observed for female Sharp-tailed Grouse (Tympanuchus phasianellus) (Gratson 1989). Thus, it appears that among classically lekking grouse species, females typically copulate only once during a breeding season, unless disturbed.…”

supporting

confidence: 66%

Do female Sharp-tailed Grouse, Tympanuchus phasianellus, copulate only once during a breeding season?

Tsuji

1996

The Canadian Field-Naturalist

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supporting

confidence: 66%

Do female Sharp-tailed Grouse, Tympanuchus phasianellus, copulate only once during a breeding season?

Tsuji

1996

The Canadian Field-Naturalist

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“…Ultimately, any advantages of small individuals relative to large individuals will affect net selection on male and female body size and the evolution of sexual size dimorphism (Arak, 1988;Blanckenhorn et al, 1995). So far, demonstrating ®tness disadvantages of large size has proved dif®cult in most species (see Geist, 1971;Banks & Thompson, 1985;McLachlan & Allen, 1987;Neems et al, 1990;Gratson, 1993;Partridge & Fowler, 1993; for some examples).…”

Section: Discussionmentioning

confidence: 99%

Foraging in yellow dung flies: testing for a small‐male time budget advantage

Blanckenhorn

Viele

1999

Ecological Entomology

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Summary 1. Mating and foraging are generally mutually exclusive activities. Individuals are thus faced with a continuous trade‐off between time and energy expended in foraging and mating, but different phenotypes should respond to this trade‐off in different ways. 2. Sexual selection theory predicts that females should maximize their time and energy spent gathering resources, whereas males should maximize their time and energy spent obtaining mates, thus minimizing their time spent foraging, subject to the constraint that they need to forage minimally to sustain their activity. 3. Smaller individuals require less food to maintain their activity. Small males in particular could therefore increase mating effort at the expense of foraging effort and, all else being equal, may thus enjoy a time budget advantage relative to large males. On the other hand, larger individuals may compensate by being more efficient at finding prey and/or extracting nutrients. 4. The effects of sex, body size, and prey density on foraging time budgets of male and female yellow dung flies, Scathophaga stercoraria, were investigated in the laboratory. 5. Higher prey density (Drosophila melanogaster) resulted in reduced feeding (= handling) and hunting (= waiting or search) times for both sexes, as predicted by the marginal value theorem applied to foraging theory. Females fed longer on a prey item than did males, and also caught the next prey item more quickly. Large individuals extracted nutrients more quickly, but were not faster at catching prey. Small individuals satiated more quickly than larger individuals and also ate fewer prey items. 6. These results are largely consistent with the predictions and suggest a small‐male time budget advantage in the yellow dung fly. Integrating the various predictions to test directly for a small‐male time budget advantage is difficult in the laboratory, however, because hunting times are unlikely to reflect the natural situation. To what extent these results lead to increased probabilities for small males of obtaining matings in the field remains to be demonstrated.

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“…Sexual selection may favour multiple male signals simultaneously during female mate choice [74–77], which could explain the strong correlations we observed between bare part and plumage/body size sexual dimorphism (though some have suggested plumage traits may not be important in sexual selection in Galliformes [7,78]). However, in several species there is no significant female preference for male bare part size, such as in the Ring-necked Pheasant Phasianus colchicus [79], the Rock Ptarmigan Lagopus muta [80], and the Sharp-tailed Grouse Tympanuchus phasianellus [81]. Whereas in the Lesser Prairie-chicken Tympanuchus pallidicinctus , successful males tend to have smaller combs but with brighter and more saturated colours [74].…”

Section: Discussionmentioning

confidence: 99%

Bare parts in the Galliformes: the evolution of a multifunctional structure

Zhao,

Kurtis,

Humbel

et al. 2024

R. Soc. Open Sci.

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A morphological trait can have multiple functions shaped by varying selective forces. Bare parts in birds, such as wattles, casques and combs, are known to function in both signalling and thermoregulation. Studies have demonstrated such structures are targets of sexual selection via female choice in several species of Galliformes (junglefowl, turkeys and grouse), though other studies have shown some role in thermoregulation (guineafowl). Here, we tested fundamental hypotheses regarding the evolution and maintenance of bare parts in Galliformes. Using a phylogeny that included nearly 90% of species in the order, we evaluated the role of both sexual and natural selection in shaping the function of bare parts across different clades. We found a combination of both environmental and putative sexually selected traits strongly predicted the variation of bare parts for both males and females across Galliformes. When the analysis is restricted to the largest family, Phasianidae (pheasants, junglefowl and allies), sexually selected traits were the primary predictors of bare parts. Our results suggest that bare parts are important for both thermoregulation and sexual signalling across Galliformes but are primarily under strong sexual selection within the Phasianidae.

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Sexual Selection for Increased Male Courtship and Acoustic Signals and Against Large Male Size at Sharp-Tailed Grouse Leks

Cited by 14 publications

References 40 publications

Do female Sharp-tailed Grouse, Tympanuchus phasianellus, copulate only once during a breeding season?

Do female Sharp-tailed Grouse, Tympanuchus phasianellus, copulate only once during a breeding season?

Foraging in yellow dung flies: testing for a small‐male time budget advantage

Bare parts in the Galliformes: the evolution of a multifunctional structure

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