Patterns and correlates of within-season breeding dispersal: A common strategy in a declining grassland songbird

Williams, Emily J.; Boyle, W. Alice

doi:10.1642/auk-17-69.1

Cited by 30 publications

(44 citation statements)

References 65 publications

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“…This is similar dispersal behavior to that previously recorded in Grasshopper Sparrows, another declining grassland passerine (Williams and Boyle 2018). We observed 20% of the birds maintaining territories throughout the season; 1 of the 10 banded sparrows held its original territory after 1 July, and another was discovered maintaining a new territory on 25 June, over 2 km from its initial capture location.…”

supporting

confidence: 86%

Southward breeding range expansion of the Baird's Sparrow

Youngberg

Bankert

Panjabi

et al. 2019

Ecology

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supporting

confidence: 86%

Southward breeding range expansion of the Baird's Sparrow

Youngberg

Bankert

Panjabi

et al. 2019

Ecology

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“…(Herse, Estey, Moore, Sandercock, & Boyle, 2017;Williams & Boyle, 2017), indicating that short-term dispersal is one possible explanation. (Herse, Estey, Moore, Sandercock, & Boyle, 2017;Williams & Boyle, 2017), indicating that short-term dispersal is one possible explanation.…”

Section: Discussionmentioning

confidence: 99%

Species‐specific and temporal scale‐dependent responses of birds to drought

Cady

O’Connell

Loss

et al. 2019

Global Change Biology

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Global climate change is increasing the frequency and intensity of weather extremes, including severe droughts in many regions. Drought can impact organisms by inhibiting reproduction, reducing survival and abundance, and forcing range shifts. For birds, considering temporal scale by averaging drought‐related variables over different time lengths (i.e., temporal grains) captures different hydrologic attributes which may uniquely influence food supplies, vegetation greenness/structure, and other factors affecting populations. However, studies examining drought impacts on birds often assess a single temporal grain without considering that different species have different life histories that likely determine the temporal grain of their drought response. Furthermore, while drought is known to influence bird abundance and drive between‐year range shifts, less understood is whether it causes within‐range changes in species distributions. Our objectives were to (a) determine which temporal grain of drought (if any) is most related to bird presence/absence and whether this response is species specific; and (b) assess whether drought alters bird distributions by quantifying probability of local colonization and extinction as a function of drought intensity. We used North American Breeding Bird Survey data collected over 16 years, generalized linear mixed models, and dynamic occupancy models to meet these objectives. Different bird species responded to drought at different temporal grains, with most showing the strongest signal at annual or near‐annual grains. For all drought‐responsive species, increased drought intensity at any temporal grain always correlated with decreased occupancy. Additionally, colonization/extinction analyses indicated that one species, the dickcissel (Spiza americana), is more likely to colonize novel areas within the southern/core portion of its range during drought. Considering drought at different temporal grains, along with hydrologic attributes captured by each grain, may better reveal mechanisms behind drought impacts on birds and other organisms, and therefore improve understanding of how global climate change impacts species and the landscapes they inhabit.

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“…Grasshopper Sparrows select grasslands with patches of sparse vegetation for foraging mixed with clumps of denser vegetation for nesting (Whitmore 1981, Ammer 2003. Sparrow territory density at our site is not related to food abundance, and within-season dispersal movements are not consistently toward high-density areas (Williams 2016) unlike other regions where this species exhibits conspecific attraction (Andrews et al 2015). Sparrow territory density at our site is not related to food abundance, and within-season dispersal movements are not consistently toward high-density areas (Williams 2016) unlike other regions where this species exhibits conspecific attraction (Andrews et al 2015).…”

Section: Introductionmentioning

confidence: 70%

“…Although it is possible that we did not measure the relevant aspects of the landscape shaping nest success, such a possibility does not alter our conclusions regarding the relationship between density and nest success. We think this unlikely at this site, however, as sparrow settlement decisions are unrelated to food availability (Williams 2016). First, aggregation may function to increase survival at later life-history stages.…”

Section: Discussionmentioning

confidence: 93%

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Social interactions do not drive territory aggregation in a grassland songbird

Winnicki

Munguía

Williams

et al. 2019

Ecology

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2020. Social interactions do not drive territory aggregation in a grassland songbird. Ecology 101(2):Abstract. Understanding the drivers of animal distributions is a fundamental goal of ecology and informs habitat management. The costs and benefits of colonial aggregations in animals are well established, but the factors leading to aggregation in territorial animals remain unclear. Territorial animals might aggregate to facilitate social behavior such as (1) group defense from predators and/or parasites, (2) cooperative care of offspring, (3) extra-pair mating, and/or (4) mitigating costs of extra-pair mating through kin selection. Using experimental and observational methods, we tested predictions of all four hypotheses in a tallgrass prairie in northeast Kansas, United States. Grasshopper Sparrow (Ammodramus savannarum) males formed clumps of territories in some parts of the site while leaving other apparently suitable areas unoccupied. Despite substantial sampling effort (653 territories and 223 nests), we found no support for any hypothesized social driver of aggregation, nor evidence that aggregation increases nest success. Our results run counter to previous evidence that conspecific interactions shape territory distributions. These results suggest one of the following alternatives: (1) the benefits of aggregation accrue to different life-history stages, or (2) the benefits of territory aggregation may be too small to detect in short-term studies and/or the consequences of aggregation are sufficiently temporally and spatially variable that they do not always appear to be locally adaptive, perhaps exacerbated by changing landscape contexts and declining population sizes.

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Patterns and correlates of within-season breeding dispersal: A common strategy in a declining grassland songbird

Abstract: BioOne Complete (complete.BioOne.org) is a full-text database of 200 subscribed and open-access titles in the biological, ecological, and environmental sciences published by nonprofit societies, associations, museums, institutions, and presses.

Cited by 30 publications

References 65 publications

Southward breeding range expansion of the Baird's Sparrow

Southward breeding range expansion of the Baird's Sparrow

Species‐specific and temporal scale‐dependent responses of birds to drought

Social interactions do not drive territory aggregation in a grassland songbird

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