How do birds search for breeding areas at the landscape level? Interpatch movements of male ortolan buntings

Dale, Svein; Steifetten, Øyvind; Osiejuk, Tomasz S.; Łosak, Katarzyna; Cygan, Jakub P.

doi:10.1111/j.2006.0906-7590.04816.x

Cited by 58 publications

(75 citation statements)

References 68 publications

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“…However this may be a reasonable explanation for our observation of negative rates of transience for Gray Jay (Table 4); this species breeds much earlier than other boreal passerines (Strickland and Ouellet 1993) and in our area most pairs had fledged young by mid-June. Adult dispersal during the breeding period is relatively unstudied in songbirds, although Dale et al (2006) reported that more than half of all breeding dispersal in a population of Ortolan Buntings (Emberiza hortulana) occurred at this time. Also, Nott and DeSante (2002) reported that peak recapture rates for known-resident (Oregon) juncos occurred at the start of the breeding season, whereas captures of known-residents of nine other species remained high until much later.…”

Section: Variation In Survival and Transiencementioning

confidence: 99%

Survival of Adult Songbirds in Boreal Forest Landscapes Fragmented by Clearcuts and Natural Openings

Whitaker¹,

Taylor²,

Warkentin³

2008

ACE

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ABSTRACT. There exists little information on demographic responses of boreal songbirds to logging. We conducted a 4-yr (2003)(2004)(2005)(2006) songbird mark-recapture study in western Newfoundland, where land cover is a naturally heterogeneous mosaic of productive spruce-fir forest, stunted taiga, and openings such as bogs, fens, and riparian zones. We compared apparent survival and rate of transience for adults of 14 species between areas having forests fragmented primarily by either natural openings or 3-7 yr-old clearcuts. Data were collected on three landscape pairs, with birds being marked on three 4-6 ha netting sites on each landscape (total = 18 netting sites). Survival rates were estimated using multi-strata mark-recapture models with landscape types specified as model strata. Landscape type was retained in the best model for only two species, Ruby-crowned Kinglet and Yellow-rumped Warbler, in both cases indicating lower apparent survival in landscapes having clearcuts. Though parameter estimates suggested lower survival in clearcut landscapes for several species, meta-analysis across all species detected no general difference between landscape types. Further, we did not detect any relation between landscape differences in survival and a species' habitat affinity, migratory strategy, or the proportion of transients in its population. Although sensitivity to logging was limited, we observed high interspecific variation in rates of breeding season apparent survival (48% [Dark-eyed Junco] to 100% [several species]), overwinter apparent survival (0.3% [Ruby-crowned Kinglet] to 86.5% [Gray Jay]), and transience (≈0% [several species] to 61% [Rubycrowned Kinglet in clearcut landscapes]). For Lincoln's and White-throated Sparrows, over-winter apparent survival was >2× higher for males than females, and rate of transience was > 8× higher for White-throated Sparrow males than females. Moderately male-biased sex ratios suggested that both lower mortality and higher site fidelity contributed to higher apparent survival of males. Overall, variability in our estimates of survival was too great to be explained by mortality alone, suggesting a large influence of landscapescale movement by adults, e.g., breeding dispersal, extra-territorial forays, and transience, on the dynamics of boreal songbird populations. These movement patterns may also confer resilience to localized disturbance in boreal landscapes.RÉSUMÉ. Peu d'informations nous permettent de mesurer la réponse démographique des oiseaux boréaux à l'exploitation forestière. Afin de pallier à cette situation, nous avons effectué une étude par capturerecapture d'une durée de 4 ans (2003)(2004)(2005)(2006)

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Section: Variation In Survival and Transiencementioning

confidence: 99%

Survival of Adult Songbirds in Boreal Forest Landscapes Fragmented by Clearcuts and Natural Openings

Whitaker¹,

Taylor²,

Warkentin³

2008

ACE

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“…Birds are known to gather information about habitat quality before making decisions on habitat selection (Jones 2001;Dale et al 2006). They select habitats by using a combination of direct resource cues, such as the quality and quantity of safe nest sites or food resources, and indirect social cues, such as the presence or breeding performance of conspecifics (Danchin et al 2004;Dall et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Social cues are preferred over resource cues for breeding-site selection in Barn Swallows

Ringhofer

Hasegawa

2014

J Ornithol

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To maximize fitness, animals choose habitats by using a combination of direct resource cues, such as the quality and quantity of safe breeding sites or food resources, and indirect social cues, such as the presence or breeding performance of conspecifics. Many reports show that nest predation leads to reduced fitness. However, it remains unclear how birds assess predation risk and how it affects breeding-site selection. In this study, we analyzed the relationship between predation risk and breeding-site selection in Barn Swallows (Hirundo rustica). We assessed the cues that swallows use in their selection. We used nestsite characteristics related to predation and foraging sites as direct resource cues, number of breeding pairs, and breeding success in the previous year as indirect social cues, and number of old and undamaged old nests as direct resource and/or indirect social cues. Breeding-site preference was assessed using the arrival date of males. We showed that only the number of undamaged old nests was used for breeding-site selection. When comparing effects at two spatial scales, nest-site and home-range, the effect of the number of undamaged old nests occurred at the homerange scale only, suggesting that these nests are used as an indirect social cue rather than a direct resource cue to reduce the energy or time-consuming costs of nest building. We suggest that undamaged old nests may indicate the presence and breeding performance of conspecifics for several previous years. Because Barn Swallows are migratory birds, undamaged old nests may be a reliable indirect social cue and may reduce the time required to sample information at breeding sites.

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“…In accordance with social constraints hypotheses, which predict that younger birds disperse greater distances than older birds (Forsman et al 2002), we found that first-year males dispersed longer than older males. As a result of longer dispersal distances, they also spent more time dispersing than older males (see also Dale et al 2006). Despite this, first-year males did not differ from older males regarding female density and sex ratio in the areas they left or settled in.…”

Section: Discussionmentioning

confidence: 89%

“…Breeding habitats, such as raised peat bogs, forest clearcuts on poor sand, land being cleared for cultivation, and one forest burn (Dale 2001b), are patchily distributed and located close to farmland which is used for feeding. A total of about 50 different habitat patches were used by ortolan buntings during the study period (see Dale et al 2006 for a map of the study area).…”

Section: Study Species and Study Areamentioning

confidence: 99%

Dispersal of male ortolan buntings away from areas with low female density and a severely male-biased sex ratio

Steifetten

Dale

2011

Oecologia

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Dispersal is expected to enhance individual fitness, and individuals should thus disperse from areas with poor conditions to areas with more favourable conditions. Few studies have compared conditions before and after dispersal of the same individuals, and in birds little is known about the effects of sex ratio and female density on male dispersal decisions. In this study we examined various fitness-related parameters that adult male ortolan buntings, Emberiza hortulana, might use as cues in their decisions to disperse and settle. The study population has a strongly male-biased sex ratio. Using pairwise comparisons of pre- and post-dispersal conditions, we found that males moved from areas with low female density and a severely male-biased sex ratio to areas with higher female density and a less male-biased sex ratio. Male density and male age structure did not affect male dispersal and settlement. The sex ratio of the pre-dispersal sites was below the population average, but post-dispersal sites were not significantly better than the population average. This suggests that dispersal was triggered by poor conditions, whereas settlement may have been unrelated to the conditions at the new site. In the year of dispersal, males that undertook dispersal were less successful at acquiring a female than males that remained faithful to the site, but in subsequent years there was no difference. We suggest that dispersal might be adaptive under more natural conditions with a more balanced sex ratio. These results show that male ortolan buntings abandon areas with low female density and a severely male-biased sex ratio, and thereby end up in better places, although probably not better than the population average.

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How do birds search for breeding areas at the landscape level? Interpatch movements of male ortolan buntings

Cited by 58 publications

References 68 publications

Survival of Adult Songbirds in Boreal Forest Landscapes Fragmented by Clearcuts and Natural Openings

Survival of Adult Songbirds in Boreal Forest Landscapes Fragmented by Clearcuts and Natural Openings

Social cues are preferred over resource cues for breeding-site selection in Barn Swallows

Dispersal of male ortolan buntings away from areas with low female density and a severely male-biased sex ratio

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