Partial or complete? The evolution of post‐juvenile moult strategies in passerine birds

Journal of Animal Ecology, Journal Year: 2020, Volume and Issue: 89(12), P. 2896 - 2908

Published: Sept. 26, 2020

Moulting strategies in birds have evolved to avoid overlap with, or prepare for, other demanding parts of the annual cycle, such as reproduction migration. When moulting for first time after leaving nest, young replace their typically poor-quality plumage during post-juvenile moult. The extent this moult varies between species from partial complete. Earlier studies, restricted Western Palearctic birds, suggest that most a complete may not be possible simply because are constrained by having same access resources adults, unless environmental conditions favourable. These studies also show is more common with nest-grown plumage. We expanded spatial and taxonomic scope previous 1,315 passerines across world considered both role constraints, quality selective pressures favouring Thus, we test whether prevalent where feathers presumably poor (shorter nestling period), live environments foster quick degradation (open habitats, high insolation humidity), males under strong sexual selection. Our data reveal 24% carry out moult, trait has phylogenetic signal. Complete inhabit warmer regions open no delayed maturation higher levels dichromatism (indicative selection). Neither presumed nor living correlates In conclusion, evolution only depends on can perform (i.e. suitable conditions) but strength selection associated need particular, necessity keep good condition challenging benefits producing adult-like colours attract mates deter rivals seem play an important role.

Language: Английский

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Female prereproductive coloration reduces mating harassment in damselflies

Evolution, Journal Year: 2020, Volume and Issue: 74(10), P. 2293 - 2303

Published: June 23, 2020

Journal Article Female prereproductive coloration reduces mating harassment in damselflies Get access Md Kawsar Khan Department of Biological Sciences Macquarie University Sydney NSW 2109 AustraliaDepartment Biochemistry and Molecular Biology Shahjalal Science Technology Sylhet 3114 Bangladesh E‐mail: [email protected] https://orcid.org/0000-0003-1795-1315 Search for other works by this author on: Oxford Academic Google Scholar Evolution, Volume 74, Issue 10, 1 October 2020, Pages 2293–2303, https://doi.org/10.1111/evo.14048 Published: 01 2020 history Received: 15 November 2019 Accepted: 18 June

Language: Английский

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Plumage colouration in gulls responds to their non‐breeding climatic niche

Global Ecology and Biogeography, Journal Year: 2020, Volume and Issue: 29(10), P. 1704 - 1715

Published: July 16, 2020

Abstract Aim Global variation in animal colouration has inspired ecogeographical rules that suggest common patterns of recurrent adaptations to climate. However, little attention been paid the relative influence different climatic conditions encountered by species during their annual life cycle. We explored this question testing whether breeding or non‐breeding most plumage gulls, a cosmopolitan group birds with extensive darkness and seasonal migratory strategies. Location Global. Time period Contemporary. Major taxa studied All subspecies gulls (Aves, Laridae). Methods used literature data digital images assess two characteristics all 80 gulls: mantle proportion black on wingtips. For each subspecies, we collected migration distance environmental variables across its range for both seasons. performed phylogenetic comparative analysis quantify experienced season colouration. Results The explained interspecific better than climate season. In accordance hypotheses role dark thermoregulation feather protection, darker was positively correlated insolation negatively air temperature. wingtips greater long migrants wintering under insolated short residents occupying less regions. Main conclusions is predominantly shaped selection outside period, hypothesized photoprotective thermoregulatory functions avian plumage. This highlights importance taking into account seasonality understand global spatial

Language: Английский

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Revealing the colourful side of birds: spatial distribution of conspicuous plumage colours on the body of Australian birds

Journal of Avian Biology, Journal Year: 2019, Volume and Issue: 51(1)

Published: Nov. 1, 2019

In many species of birds, different body parts often display very colours. This spatial distribution coloured plumage patches may be determined, among other factors, by the balance between being cryptic to predators, and conspicuous intended receivers. If this is case, ventral anterior in birds – which are less visible predators but more prominent conspecifics should present sexually dichromatic Here, I test these predictions using reflectance spectrometric measurements standardised across males females for nearly an entire avifauna (Australian landbirds, n = 538 species). My data show that, as predicted, colours mainly located near head, while back most cryptic. One clear exception pattern rump coloration. species, patch can concealed wings, therefore exposed only when necessary. addition, coloration could deflect or confuse case attack. However, there considerable variation makes position on a poor predictor elaboration (R 2 < 0.02). Future studies try determine whether differences due ecological factors (predation risk, habitat, etc.).

Language: Английский

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A global analysis reveals the dynamic relationship between sexual selection and population abundance in space and time

Published: Sept. 17, 2023

Sexual selection leads to the evolution of extravagant weaponry or ornamental displays, with bearer these traits gaining a reproductive advantage, potentially at cost individual’s survival. The consequences sexual can therefore impact species demographic processes and overall abundance. Currently, evidence connecting effects demography abundance is conflicting. This study aims rectify this issue by assessing relationship between in Passerines across globe, importantly, accounting for migration seasonality. We integrate global citizen science dataset bird observations Passerine trait data show that seasonality are key moderators For resident Passerines, consistently positive year, whereas migrant neutral, significant negative dip during pre-breeding (for Northern Hemisphere Passerines). Our results suggest bolsters populations experience less intense natural selection.

Language: Английский

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Extended molt phenology models improve inferences about molt duration and timing

Ornithology, Journal Year: 2024, Volume and Issue: 141(2)

Published: Jan. 14, 2024

Abstract Molt is an essential life-history event in birds and many mammals, as maintenance of feathers fur critical for survival. Despite this molt remains understudied event. Non-standard statistical techniques are required to estimate the phenology from observations plumage or pelage state, existing models have strict sampling requirements that can be difficult meet under real-world conditions. We present extended modelling framework accommodate features datasets, such re-encounters individuals, misclassified states, and/or state-dependent bias. demonstrate lead biased inferences when using models, show our model extensions improve about a wide range hope novel removes barriers data datasets thereby further facilitates uptake appropriate methods data. Although we focus on molt, applicable other phenological processes recorded either ordered categories approximately linear progress scores.

Language: Английский

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The evolution of rodent tail morphology

The American Naturalist, Journal Year: 2024, Volume and Issue: 203(6), P. 629 - 643

Published: Feb. 1, 2024

AbstractPopulation-level variation in rodent tail structures has been variously attributed to facilitating social communication, locomotion, thermoregulation, and predator avoidance. Little is known, however, about the applicability of these ecological correlates explaining tremendous interspecific diversity this appendage. To investigate potential drivers morphology at a macroevolutionary level, we first carefully reviewed literature constructed list major hypotheses regarding variation. We then compiled database 11 different traits related length, color, texture, characteristics for 2,101 species rodents (order Rodentia) examined their key evolutionary correlates. Using Bayesian phylogenetic mixed models across entire order additionally within five suborders, found that length correlated with both temperature (Allen's rule) locomotory mode, black tips are more common brightly lit environments, naked tails often warmer climates, fluffy-tipped smaller and/or arboreal species, prehensility predominant longer tails, autotomy open environments. Most our tested predictions, largely drawn from population-level studies, not recapitulated order, potentially indicating role local context shaping morphology.

Language: Английский

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Long‐ and short‐term responses to climate change in body and appendage size of diverse Australian birds

Global Change Biology, Journal Year: 2024, Volume and Issue: 30(10)

Published: Oct. 1, 2024

Abstract Changes to body size and shape have been identified as potential adaptive responses climate change, but the pervasiveness of these has questioned. To address this, we measured appendage from 5013 museum bird skins 78 ecologically evolutionary diverse Australian species. We found that morphological change is a shared response across birds. Birds increased relative bill surface area, tarsus length, wing length through time, consistent with expectations increasing climates warm. Furthermore, birds decreased in absolute expectation decreasing warmer climates. Interestingly, trends were generally different diets migratory thermoregulatory behaviors. Shorter term higher temperatures contrary long‐term effects for appendages, wherein after hotter years, indicating complex selective pressures acting on rise change. Overall, our findings support notion adaptation widespread independent other ecological traits.

Language: Английский

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Social and abiotic factors differentially affect plumage ornamentation of young and old males in an Australian songbird

Animal Behaviour, Journal Year: 2021, Volume and Issue: 182, P. 173 - 188

Published: Nov. 16, 2021

Language: Английский

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A global analysis of aerial displays in passerines revealed an effect of habitat, mating system and migratory traits

Proceedings of the Royal Society B Biological Sciences, Journal Year: 2022, Volume and Issue: 289(1973)

Published: April 20, 2022

Aerial displaying is a flamboyant part of the sexual behaviour several volant animal groups, including birds. Nevertheless, little attention has been focused on identifying correlates large-scale diversity in this trait. In study, we scored presence and absence aerial displays males 1732 species passerine birds (Passeriformes) employed Bayesian phylogenetically informed mixed models to test for associations between set life-history environmental predictors. Our multi-variate revealed that with perform inhabited open rather than closed (forested) habitats. These also exhibited higher levels polygyny, had more elongated wings, migrated over longer distances bred at latitudes. When included where function not explicitly described but likely occur, found was associated smaller body size increased male plumage coloration. results suggest both selection natural have important sources passerines.

Language: Английский

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