Male song sparrows modulate their aggressive signaling in response to plumage signals: experiments with 3-D printed models DOI Creative Commons
Michelle L. Beck,

Ҫağlar Akҫay,

Kendra B. Sewall

et al.

bioRxiv (Cold Spring Harbor Laboratory), Journal Year: 2019, Volume and Issue: unknown

Published: Sept. 4, 2019

Abstract Competitive interactions among conspecifics are often resolved by assessing signals that honestly indicate individual fighting ability or dominance. In territorial species, of competitive thought to function primarily during the early stages territory establishment, but recent evidence suggests these continue influence with floaters and neighbors well after establishment. Here, we examine extent chest spotting displayed an intruding male on response song sparrows. We exposed males 3-D printed models large small area coupled conspecific playback recorded their behavior. also assessed a subset both traditional, taxidermic mount ensure were realistic stimulus. found no differences in number attacks proximity model due area. However, produced more soft songs tended sing fewer loud songs, which predict attack our population, less spotting. One possibility is elicit stronger because they seen as greater threat. Based previous findings this system, think it likely perceived subordinate therefore easier defeat, leading holders. equally signaled aggressively trials than models. This birds recognized meaningful stimuli use should be validated through comparison traditional when possible.

Language: Английский

Evolutionary drivers of seasonal plumage colours: colour change by moult correlates with sexual selection, predation risk and seasonality across passerines DOI
Alexandra McQueen, Bart Kempenaers, James Dale

et al.

Ecology Letters, Journal Year: 2019, Volume and Issue: 22(11), P. 1838 - 1849

Published: Aug. 23, 2019

Abstract Some birds undergo seasonal colour change by moulting twice each year, typically alternating between a cryptic, non‐breeding plumage and conspicuous, breeding (‘seasonal colours’). We test for potential drivers of the evolution colours in all passerines ( N = 5901 species, c. 60% birds). Seasonal are uncommon, having appeared on multiple occasions but more frequently lost during evolution. The trait is common small, ground‐foraging species with polygynous mating systems, no paternal care strong sexual dichromatism, suggesting it evolved under selection high predation risk. also predicted to have schedules, such as migratory those living climates. propose that resolve trade‐off effects natural colouration, especially environments.

Language: Английский

Citations

40
Female and male plumage colour signals aggression in a dichromatic tropical songbird DOI
Ana V. Leitão, Michelle L. Hall, Kaspar Delhey

et al.

Animal Behaviour, Journal Year: 2019, Volume and Issue: 150, P. 285 - 301

Published: March 4, 2019

Language: Английский

Citations

31
In love and war: The morphometric and phylogenetic basis of ornamentation, and the evolution of male display behavior, in the livebearer genus Poecilia DOI
Daniel L. Goldberg, J. Alex Landy, Joseph Travis

et al.

Evolution, Journal Year: 2019, Volume and Issue: 73(2), P. 360 - 377

Published: Jan. 17, 2019

Exaggerated male traits under sexual selection are often used for both competition and courtship, raising the question of whether ornaments evolved simultaneously functions, or if use in one context preceded another. Here, we apply a phylogenetic approach to study evolution ornamental dorsal fins poeciliid fish subgenera Mollienesia Limia, which exhibit convergent development an enlarged fin, direct erect-fin displays female conspecifics. Unlike prior categorical assessments adornments, measure fin exaggeration with continuous index ornamentation. Phylogenetic logistic generalized least squares regression analyses indicate that high values significantly associated two component postures courtship aggressive displays, erection body curvature, but not presence dichromatism. Male initially male–male aggression common ancestor suggesting this signal originated competition, then became co-opted courtship. These results support armament-ornament hypothesis exaggerated traits, consistent evolutionary shift predominant mechanisms from intra- intersexual.

Language: Английский

Citations

23
Fitness outcomes in relation to individual variation in constitutive innate immune function DOI Open Access
Michael J. Roast, Nataly Hidalgo Aranzamendi, Marie Fan

et al.

Proceedings of the Royal Society B Biological Sciences, Journal Year: 2020, Volume and Issue: 287(1938), P. 20201997 - 20201997

Published: Nov. 4, 2020

Although crucial for host survival when facing persistent parasite pressure, costly immune functions will inevitably compete resources with other energetically expensive traits such as reproduction. Optimizing, but not necessarily maximizing, function might therefore provide net benefit to overall fitness. Evidence associations between fitness and is relatively rare, limiting our potential understand ultimate costs of investment. Here, we assess how measures constitutive (haptoglobin, natural antibodies, complement activity) relate subsequent outcomes (survival, reproductive success, dominance acquisition) in a wild passerine (Malurus coronatus). Surprisingly, probability was positively linearly predicted by any index. Instead, both low high values activity (quadratic effect) were associated higher survival, suggesting that different investment strategies reflect dynamic disease environment. Positive linear relationships indices success suggest individual heterogeneity overrides resource reallocation trade-offs within individuals. Controlling body condition (size-adjusted mass) chronic stress (heterophil-lymphocyte ratio) did alter findings sample subset available data. Overall, results components have limited variation maintenance relates differences more closely.

Language: Английский

Citations

22
Persistent low avian malaria in a tropical species despite high community prevalence DOI Creative Commons
Justin R. Eastwood, Lee Peacock, Michelle L. Hall

et al.

International Journal for Parasitology Parasites and Wildlife, Journal Year: 2019, Volume and Issue: 8, P. 88 - 93

Published: Jan. 11, 2019

Malarial and other haemosporidian parasites are widespread; however, their temporal dynamics ill-understood. Longitudinal sampling of a threatened riparian bird revealed consistently very low prevalence over 13 years (∼5%) despite infections persisting increasing with age. In contrast, three key species within this tropical community were highly infected (∼20-75% prevalence) these differences stable. Although we found novel lineages phylogenetic structure at the local level, there was little geographic structuring Australasia. This study suggests that malarial parasite susceptibility is determined by host factors can maintain levels high prevalence.

Language: Английский

Citations

22
Multiple components of feather microstructure contribute to structural plumage colour diversity in fairy-wrens DOI Open Access
Marie Fan, Liliana D’Alba, Matthew D. Shawkey

et al.

Biological Journal of the Linnean Society, Journal Year: 2019, Volume and Issue: 128(3), P. 550 - 568

Published: July 5, 2019

Abstract Closely related species often differ in coloration. Understanding the mechanistic bases of such differences can reveal whether evolutionary changes colour are driven by single key mechanisms or multiple pathways. Non-iridescent structural plumage colours birds a good model which to test these questions. These result from light absorption pigments, scattering medullary spongy layer (a nanostructure found within barbs) and contributions other elements. Fairy-wrens (Malurus spp.) small clade closely that display large diversity ornamental colours. Using spectrometry, electron microscopy Fourier analysis, we show 30 colours, varying ultraviolet blue purple, share similar barb morphology. Despite this similarity, find at microscopic scale, variation across elements, including size density keratin cortex, melanin, explains diversity. independent axes morphological together account for sizeable amounts variability (R2 = 0.21–0.65). The coexistence many independent, evolutionarily labile generate suggests could be mediated genetic environmental factors.

Language: Английский

Citations

21
More than kin: subordinates foster strong bonds with relatives and potential mates in a social bird DOI Open Access
Niki Teunissen, Sjouke A. Kingma, Michelle L. Hall

et al.

Behavioral Ecology, Journal Year: 2018, Volume and Issue: unknown

Published: Aug. 17, 2018

Social interactions shape relationships between individuals in complex societies. Affiliative are associated with benefits and strengthen social bonds, while aggressive costly negatively affect bonds. Individuals may attempt to reduce encounters through submissive displays directed at higher-ranking individuals. Thus, fine-scale patterns of affiliative, aggressive, reflect beneficial within groups, providing insight into the group living mechanisms conflict resolution. So far, however, most studies have looked isolation. We investigated how strength bonds (affiliative vs. interactions) varied kin-selected potential mating benefits, reproductive cooperatively breeding purple-crowned fairy-wren, Malurus coronatus. Our results revealed that subordinates formed equally strong kin mates (unrelated opposite-sex individuals) they antagonistic competitors offered no or same-sex individuals). Submissive were exclusively breeders, regardless relatedness. Affiliation submission reduced foraging time when food was limited, indicating a cost maintaining positive relationships. Together, our suggest is determined by (potential) obtained from members, likely serves conflict. findings highlight importance time-costly for groups (partly) divergent interests can remain stable.

Language: Английский

Citations

14
The evolution of delayed dispersal and different routes to breeding in social birds DOI
Sjouke A. Kingma, Kat Bebbington, Niki Teunissen

et al.

Advances in the study of behavior, Journal Year: 2021, Volume and Issue: unknown, P. 163 - 224

Published: Jan. 1, 2021

Language: Английский

Citations

9
Male fairy-wrens produce and maintain vibrant breeding colors irrespective of individual quality DOI Open Access
Alexandra McQueen, Kaspar Delhey, Flavia R. Barzan

et al.

Behavioral Ecology, Journal Year: 2020, Volume and Issue: 32(1), P. 178 - 187

Published: Nov. 10, 2020

Abstract Conspicuous colors may signal individual quality if high-quality individuals produce more elaborate or have a greater capacity to invest in color maintenance. We investigate these hypotheses using repeated within-individual observations and experimentally induced production wild bird, the superb fairy-wren (Malurus cyaneus). Male fairy-wrens undergo an annual molt from brown, nonbreeding plumage ultraviolet-blue black breeding plumage. Color maintenance is especially relevant for this species because structural, are particularly susceptible fading. Further, only most sexually attractive males early (before spring) thereby keep their extended time before season. Our results show that (i) attractive, early-molting do not higher (ii) impacted by inducing while low body condition. found (iii) fade but remain consistent become saturated within over time. Despite this, (iv) spend preening Instead, pristine condition re-molting parts of throughout season, suggesting alternative, potential cost maintaining ornamental colors. conclude variation structural unlikely indicate fairy-wrens.

Language: Английский

Citations

7
Agonistic behavioural asymmetry in two species of montane lizard that exhibit elevational replacement DOI
Anna F. Senior, David G. Chapple, Zak S. Atkins

et al.

Landscape Ecology, Journal Year: 2021, Volume and Issue: 36(3), P. 863 - 876

Published: Jan. 12, 2021

Language: Английский

Citations

5