It’s about Her: Male Within-Season Movements Are Related to Mate Searching in a Songbird

The American Naturalist, Journal Year: 2024, Volume and Issue: 203(5), P. 562 - 575

Published: Jan. 11, 2024

AbstractIn species with resource-defense mating systems (such as most temperate-breeding songbirds), male dispersal is often considered to be limited in both frequency and spatial extent. When occurs within a breeding season, the favored explanation ecological resource tracking. In contrast, movements of birds associated temporary emigration, such polyterritoriality (i.e., defense an additional location after attracting female initial territory), are usually attributed mate searching. We suggest that functionally related searching may unifying hypothesis for predicting within-season songbirds. Here, we test three key predictions derived from this Wood Warblers (

Language: Английский

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Accurate prediction of olive‐sided flycatcher breeding status using song rate measured with autonomous recording units

Journal of Wildlife Management, Journal Year: 2025, Volume and Issue: unknown

Published: April 15, 2025

Abstract Autonomous recording units (ARUs) are recognized for their use in detecting vocalizing bird species to assess presence, occupancy, and density, but potential monitor reproductive status of individuals rates is not well known. We investigated whether song derived from ARU data, when combined with the known date, can be used predict proportion male songbirds 3 breeding classes (single, paired, feeding young). monitored weekly field visits collected daily recordings at 46 olive‐sided flycatcher ( Contopus cooperi ) territories northwestern Canada 2016–2017. tested 4 variations a hierarchical multinomial regression model that time day, day year, rate 2‐minute status, evaluated models using novel, likelihood‐based approach. found top correctly estimated 79% observed proportions birds each across length season. Although date was primary predictor singing reduced some uncertainty provided more accurate estimates given time. A major challenge prediction accuracy data interpretation accounting movement associated impact on detection, which we partly addressed by limiting our study who were detected least 30% sampling days. demonstrate ARUs cryptic, low‐density risk such as flycatcher, suggesting this method could applied wider range better understand demographics population dynamics, inform management decisions, concern.

Language: Английский

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Territory Sizes and Patterns of Habitat Use by Forest Birds Over Five Decades: Ideal Free or Ideal Despotic?

Ecology Letters, Journal Year: 2024, Volume and Issue: 27(12)

Published: Dec. 1, 2024

Relations among territoriality, abundance and habitat suitability are fundamental to the ecology of many animal populations. Theory suggests two classes possible responses increasing in territorial species: (1) ideal free distribution (IFD), which predicts smaller territory sizes decreased fitness as individuals adaptively pack into suitable habitats, (2) despotic (IDD), stable preferred habitats for dominant increased use marginal reduced changes subordinate individuals. We analysed locations seven migratory songbird species occupying a 10-ha plot Hubbard Brook Experimental Forest, New Hampshire, USA over 52-year period. Species varied years from twofold 22-fold, all displayed clear patterns preference within study plot. Consistent with IFD, contrary IDD, local species, irrespective preferences. There was at least variation size years. Conformity predictions IFD argues efficacy defence songbirds has general consequences population dynamics.

Language: Английский

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A test of the mechanistic process behind the convergent agonistic character displacement hypothesis

Behavioral Ecology, Journal Year: 2024, Volume and Issue: 35(6)

Published: Sept. 14, 2024

In this era of rapid global change, understanding the mechanisms that enable or prevent species from co-occurring has assumed new urgency. The convergent agonistic character displacement (CACD) hypothesis posits signal similarity enables co-occurrence ecological competitors by promoting aggressive interactions reduce interspecific territory overlap and hence, exploitative competition. northwestern Switzerland, ca. 10%

Language: Английский

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The Divergence of Male Reproductive Strategy as the Cause of Nomadism in Wood Warbler

Research Square (Research Square), Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 4, 2024

The Wood Warbler Phylloscopus sibilatrix is a nomadic migratory songbird. Males often change territories during breeding season and every year displaying low nest-site fidelity. However, the benefits of frequent between remain unclear. During our research, playback experiments were implemented to test whether male settlement or departure are affected by quality conspecifics nearby female presence. High rate song broadcasts used imitate presence males with ‘good’ ‘poor’ quality, arriving subsequently banded colour rings track their further movements plots. results showed that 52 66,7% left plot first week after arrival (labelled as ‘floaters’) but leaving they did not try settle on other plots, where high songs broadcasted. We tested 'hidden lek' hypothesis tracking appearances near local nests. abundance increased significantly start egg-laying compared 10-days prior it decreased next 10 days incubation start, assuming territory copulation females. study suggests increase chances offspring, some floaters move through copulate females rather than nearby.

Language: Английский

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