Rainfall and population dynamics of Grey Pileated Finch Coryphospingus pileatus (Aves: Passeriformes) in a Neotropical dry forest

Population Ecology, Journal Year: 2018, Volume and Issue: 60(3), P. 223 - 235

Published: June 8, 2018

Abstract In tropical dry environments rainfall periodicity may affect demographic parameters, resulting in fluctuations bird abundance. We used capture–recapture data for the Grey Pileated Finch from a Neotropical forest to evaluate hypothesis that intra‐ and inter‐annual survival, individuals entrance population abundance, are related local rainfall. Sampling occurred across 3 years, with captured, tagged evaluated age presence of brood patch every 14 days. Using POPAN formulation, we generated models study temporal dynamics. Best‐fit indicated low apparent annual survival first year (16%) compared other years (between 47 62%), this value associated an extreme drought. The abundance juveniles at each capture occasion was significantly dependent on accumulated precipitation previous days, juvenile covariate strong predictor intra‐annual probability (natality). Individuals during reproductive period corresponded 53, 52 75% total ingress year, respectively. trend sampled size positive exponential growth ( N initial = 50, last 600), becoming progressively more intense. Low relevant decline onset, while end intense promoted rapid growth. Thus, indirect effects combined effect two rates operated synergistically immediate Finch, abundant forest.

Language: Английский

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Southern House Wren (Troglodytes musculus)

Birds of the World, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 22, 2024

Language: Английский

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Risk‐Taking in Bluebirds After Exposure to a Nest Predator Relates to Parental Roles and Shows Little Cooperation Between Partners

Ethology, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 27, 2024

ABSTRACT Parents may experience a trade‐off between caring for offspring and protecting themselves from predators. The reproductive value hypothesis predicts that parents should take more risks older, valuable offspring, whereas the harm to risk vulnerable would suffer most lack of parental care at moment. After exposing parent mountain bluebirds ( Sialia, currucoides ) model predator, we recorded latency times them touch, look into, enter their nestbox number they inspected box across three breeding stages: nest‐building, incubation nestling‐rearing. Females took greater than males during nest‐building stages by inspecting entering boxes sooner times, consistent with role in those early requires box. Risk‐taking was hypothesis, increasing stages. In contrast, females greatest incubation, hypothesis. Furthermore, riskiest behaviours were not correlated pair members, both sexes assumed first inspect approximately equally. This suggests there is ‘war attrition’ mates over risk‐taking, but neither cooperation male facilitate rapid resumption his mate. results highlight patterns investment nest defense birds be sex‐specific.

Language: Английский

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Females and males maintain similar-sized, stable territories between breeding and nonbreeding seasons in a tropical oriole (Icterus icterus)

The Wilson Journal of Ornithology, Journal Year: 2019, Volume and Issue: 131(3), P. 524 - 524

Published: Oct. 10, 2019

Territories provide important breeding and nonbreeding resources for many bird species. Most songbird territory research has been conducted in temperate regions during the season, a situation which primarily males appear to defend territories only few months. In tropics, however, both females of species may year-round multiple years, yet studies have verified this with marked or radio-tagged birds. To assess stability sexes between seasons we examined similarity size, location, overlap neighbors 2 subsequent tropical resident songbird, Troupial (Icterus icterus). Mated maintained similar-sized, tightly overlapping that had considerably less than each other. Both similar-sized years. The location centers extent was also similar Divorce and/or switching appeared be uncommon, but upon disappearance mate, often replaced mate maintain territory. Our work quantitatively verifies territorial behavior expected Such likely plays role song, plumage, sex similarities seen female male Troupials.

Language: Английский

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Effects of nest predation on a south temperate house wren population

Journal of Avian Biology, Journal Year: 2021, Volume and Issue: 52(4)

Published: March 2, 2021

Nest predation can have several effects on breeding birds. It reduces success but also, it strongly affect parental investment and reproductive decisions. Here we tested the extent of nest south temperate house wrens Troglodytes aedon bonariae by comparing nesting decisions pairs in plots that differed failure rates. During 2007 2008 seasons monitored nests built boxes with a 27 mm entrance hole plot (E1) 54 another (E2). At end season reduced holes at E2 to mm. seasons, failures were higher than E1 (70.6% 25.8% respectively). Clutch sizes, brood sizes number fledgling produced per smaller E1. However, females laid bigger eggs. Hatching was lower E1, similar between sites. Females performed less frequently second those We did not detect differences sites individual dispersal, mate change, apparent adult survival offspring recruitment. As consequence clutch size, hatching frequency double broods, individuals had annual productivity No found during 2009 2010 seasons. Our results provide experimental evidence existence costs beyond loss associated areas high risk wrens.

Language: Английский

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Patterns and causes of breeding dispersal in a declining population of Canada jays, Perisoreus canadensis, over 55 years

Animal Behaviour, Journal Year: 2021, Volume and Issue: 182, P. 31 - 41

Published: Oct. 26, 2021

Language: Английский

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Divorce rate in birds increases with male promiscuity and migration distance

bioRxiv (Cold Spring Harbor Laboratory), Journal Year: 2022, Volume and Issue: unknown

Published: Oct. 17, 2022

Abstract Socially monogamous animals may break up their partnership after one breeding season by a so-called ‘divorce’ behaviour. Divorce rate immensely varies across avian taxa that have predominantly social mating system. Although range of factors associated with divorce been tested, there is not consensus regarding the large-scale variation and relationships among factors. Moreover, impact sexual roles in still needs further investigation. Here, we applied phylogenetic comparative methods to analyze largest datasets ever compiled included rates from published case studies 232 species 25 orders 61 families. We tested correlations between group are closely related pair bond strength: promiscuity both sexes, migration distance, adult mortality. Our results showed only male promiscuity, but female had critical relationship rate. Furthermore, distance was positively correlated indirectly affected via promiscuity. These findings indicated might be simply explained as an adaptive strategy or neutral occurrence, could mixed response conflict stress ambient environment.

Language: Английский

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