Experimental food supplementation reveals habitat-dependent male reproductive investment in a migratory bird

Kaiser, Sara A.; Sillett, T. Scott; Risk, Benjamin B.; Webster, Michael S.

doi:10.1098/rspb.2014.2523

Cited by 29 publications

(47 citation statements)

References 56 publications

(105 reference statements)

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“…Black-throated blue warblers (Setophaga caerulescens (Gmelin, 1789)) (35.1% EPY), another Nearctic-Neotropical migrant reported from a site about 60 km northeast of our study area (Kaiser et al 2015), and hooded D r a f t warblers (Setophaga citrina (Boddaert, 1783)) (34% EPY) breeding in deciduous forests of Pennsylvania (Chiver et al 2008) migrate similar distances, about half that of the Canada warbler. As such, these species have the opportunity to double-brood while the latter is an obligate single-brooded species (Reitsma et al 2010).…”

Section: Discussionmentioning

confidence: 99%

“…2). Maximizing EPY may come at the expense of siring or fledging WPY in part due to lower mate guarding (Westneat et al 1990;Kaiser et al 2015). This tradeoff may be exacerbated for species with highly synchronized breeding attempts that do not double brood.…”

Section: Discussionmentioning

confidence: 99%

“…Territory location, habitat quality and age have been shown to influence EPP (Kaiser et al 2015;Sardell et al 2010;Woolfenden et al 2005). Older males generally rank higher in the social hierarchy and thus perform better by asserting competitive dominance (Hunt 1996;Marra and Holmes 2001;Reitsma et al 2008).…”

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confidence: 99%

“…Siring young outside a social pair bond has the ability to enhance productivity within a single breeding season and is an important component of male fitness (Griffith et al 2002, Kaiser et al 2015, but males within a population can differ considerably in their fitness gains from EPP (Sardell et al 2010;Reid et al 2014a;Kaiser et al 2015).…”

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Extra-pair paternity in a long-distance migratory songbird beyond neighbors’ borders and across male age classes

et al. 2018

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Roughly 90% of socially monogamous bird species exhibit some degree of extra-pair paternity (EPP), although the extent and the underlying mechanisms vary among species. We analyzed spatial and demographic patterns of EPP over a 6 year period (2005–2010) as part of a long-term population study of Canada Warblers (Cardellina canadensis (L., 1766)). We identified 12 microsatellite loci used to assess paternity for 185 nestlings from 61 nests. Extra-pair young (EPY) accounted for 41.6% of all nestlings and 57.4% of nests contained at least one EPY. Fewer than half of EPY were sired by males who shared territorial boundaries, and some males sired young in nests 1 km from their territory. The age of social males did not differ from males who cuckolded them. The majority (83%) of EPY were sired by males in older age classes (2+ years old), while <17% were sired by 1 year olds. Of the young sired by older males, 58.5% were sired by males 3–7 years old. Males that sired more EPY sired fewer within-pair young (WPY); those without EPY sired more WPY suggesting a possible fitness trade-off between these two strategies. Our findings suggest multiple age-based strategies within a single breeding population, as well as potential strategy shifts to maximize lifetime fitness as they age.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Extra-pair paternity in a long-distance migratory songbird beyond neighbors’ borders and across male age classes

et al. 2018

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“…; Kaiser et al . ). For this study, we developed SNP markers from a transcriptome assembled using RNA‐sequencing (RNA‐seq) of black‐throated blue warblers sampled in northern populations.…”

Section: Introductionmentioning

confidence: 97%

A comparative assessment ofSNPand microsatellite markers for assigning parentage in a socially monogamous bird

Kaiser

Taylor

Chen

et al. 2016

Molecular Ecology Resources

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Single-nucleotide polymorphisms (SNPs) are preferred over microsatellite markers in many evolutionary studies, but have only recently been applied to studies of parentage. Evaluations of SNPs and microsatellites for assigning parentage have mostly focused on special cases that require a relatively large number of heterozygous loci, such as species with low genetic diversity or with complex social structures. We developed 120 SNP markers from a transcriptome assembled using RNA-sequencing of a songbird with the most common avian mating system-social monogamy. We compared the effectiveness of 97 novel SNPs and six previously described microsatellites for assigning paternity in the black-throated blue warbler, Setophaga caerulescens. We show that the full panel of 97 SNPs (mean H = 0.19) was as powerful for assigning paternity as the panel of multiallelic microsatellites (mean H = 0.86). Paternity assignments using the two marker types were in agreement for 92% of the offspring. Filtering individual samples by a 50% call rate and SNPs by a 75% call rate maximized the number of offspring assigned with 95% confidence using SNPs. We also found that the 40 most heterozygous SNPs (mean H = 0.37) had similar power to assign paternity as the full panel of 97 SNPs. These findings demonstrate that a relatively small number of variable SNPs can be effective for parentage analyses in a socially monogamous species. We suggest that the development of SNP markers is advantageous for studies that require high-throughput genotyping or that plan to address a range of ecological and evolutionary questions.

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Climate‐mediated population dynamics of a migratory songbird differ between the trailing edge and range core

Lewis

Cooper

Chandler

et al. 2023

Ecological Monographs

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Understanding the demographic drivers of range contractions is important for predicting species' responses to climate change; however, few studies have examined the effects of climate change on survival and recruitment across species' ranges. We show that climate change can drive trailing edge range contractions through the effects on apparent survival, and potentially recruitment, in a migratory songbird. We assessed the demographic drivers of trailing edge range contractions using a long‐term demography dataset for the black‐throated blue warbler (Setophaga caerulescens) collected across elevational climate gradients at the trailing edge and core of the breeding range. We used a Bayesian hierarchical model to estimate the effect of climate change on apparent survival and recruitment and to forecast population viability at study plots through 2040. The trailing edge population at the low‐elevation plot became locally extinct by 2017. The local population at the mid‐elevation plot at the trailing edge gradually declined and is predicted to become extirpated by 2040. Population declines were associated with warming temperatures at the mid‐elevation plot, although results were more equivocal at the low‐elevation plot where we had fewer years of data. Population density was stable or increasing at the range core, although warming temperatures are predicted to cause population declines by 2040 at the low‐elevation plot. This result suggests that even populations within the geographic core of the range are vulnerable to climate change. The demographic drivers of local population declines varied between study plots, but warming temperatures were frequently associated with declining rates of population growth and apparent survival. Declining apparent survival in our study system is likely to be associated with increased adult emigration away from poor‐quality habitats. Our results suggest that demographic responses to warming temperatures are complex and dependent on local conditions and geographic range position, but spatial variation in population declines is consistent with the climate‐mediated range shift hypothesis. Local populations of black‐throated blue warblers near the warm‐edge range boundary at low latitudes and low elevations are likely to be the most vulnerable to climate change, potentially leading to local extirpation and range contractions.

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Experimental food supplementation reveals habitat-dependent male reproductive investment in a migratory bird

Cited by 29 publications

References 56 publications

Extra-pair paternity in a long-distance migratory songbird beyond neighbors’ borders and across male age classes

Extra-pair paternity in a long-distance migratory songbird beyond neighbors’ borders and across male age classes

A comparative assessment ofSNPand microsatellite markers for assigning parentage in a socially monogamous bird

Climate‐mediated population dynamics of a migratory songbird differ between the trailing edge and range core

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