Survival rates of adult Reed Warblers<i>Acrocephalus scirpaceus</i>at a northern and southern site in England

Thaxter, Chris B.; Redfern, Christopher P.F.; Bevan, R. M.

doi:10.1080/03078698.2006.9674347

Cited by 21 publications

(21 citation statements)

References 29 publications

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“…Variable sensitivity of different habitats to rainfall levels may explain the inconsistent relationships between survival and rainfall in Africa that were found for different bird species (Boano et al 2004;Salewski et al 2013;Ockendon et al 2014;Johnston et al 2016). Our results are also in line with the earlier findings of Thaxter et al (2006) and Zwarts et al (2009), who did not find a significant effect of African droughts on the size of Reed Warbler populations. However, our estimates are based on a 9-year dataset.…”

Section: Discussionsupporting

confidence: 83%

“…Other studies focusing on Reed Warblers have reported annual survival estimates of between 0.33 and 0.60 (Long 1975;Thaxter et al 2006). It is important to stress, however, that we found a considerable variation in apparent survival between years at our study site, varying from 0.340 to 0.593.…”

Section: Discussioncontrasting

confidence: 50%

“…This pattern has been found in several studies of Reed Warblers (e.g. Boano et al 2004;Thaxter et al 2006) and most likely does not result from differential inter-annual dispersal of both sexes, as the distances birds move between seasons are similar for resident males and females and are not statistically significant (L. Halupka, unpublished data).…”

Section: Discussionmentioning

confidence: 61%

“…Stokke et al 2005;Low et al 2010). Interestingly, however, Thaxter et al (2006) found opposite patterns (higher and lower male survival compared to the females) in two populations of British Reed Warblers, suggesting that sexbased survival and/or emigration may be site-specific in the species.…”

Section: Discussionmentioning

confidence: 87%

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Conditions at autumn stopover sites affect survival of a migratory passerine

Hałupka

Wierucka

Sztwiertnia³

et al. 2017

J Ornithol

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Weather is an important factor affecting many aspects of avian ecology, yet its importance for survival during various periods of the avian annual cycle has received relatively little attention and remains poorly understood. We have investigated the effect of weather conditions at the breeding and wintering grounds and during migration on the survival probability of Eurasian Reed Warblers Acrocephalus scirpaceus, a long-distance Palaearctic-African migrant species. We found that annual survival was significantly affected by precipitation at the autumn stopover sites in Spain and Morocco, where Reed Warblers accumulate energy reserves prior to crossing the Sahara desert: low rainfall was associated with decreased survival. We suggest that arid conditions at these crucial stopover sites may cause limitations in food availability, prevent proper refueling and hence result in lower survival.Survival estimates were not related to weather conditions in Africa during the bird wintering period or the preceding wet season. Likewise, meteorological conditions at the breeding area did not influence survival. Survival estimates for males and females did not differ, although recapture probability was significantly lower for females than for males. Our results indicate that weather significantly influences Reed Warbler survival, although its effect may vary for different stages of the annual cycle. Our findings suggest that marked climatic changes occurring along migratory routes, in particular at important stopover sites, may have far-reaching consequences on bird survival and population size.

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Section: Discussionsupporting

confidence: 83%

Section: Discussioncontrasting

confidence: 50%

Section: Discussionmentioning

confidence: 61%

Section: Discussionmentioning

confidence: 87%

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Conditions at autumn stopover sites affect survival of a migratory passerine

Hałupka

Wierucka

Sztwiertnia³

et al. 2017

J Ornithol

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“…Studies on the Sedge Warbler revealed a strong correlation between the numbers of this species in Great Britain and the Netherlands and the amount of rainfall at its winter quarters in West Africa (Peach et al 1991, Foppen et al 1999. However, this correlation was not valid for the Reed Warbler (Thaxter et al 2006). Habitat changes due to human activity, especially habitat fragmentation, can influence bird numbers as well: in the Netherlands after a rapid decrease in numbers, populations of the Sedge Warbler inhabiting fragmented wetlands did not recover, unlike populations from denser marshes (Foppen et al 1999).…”

Section: Discussionmentioning

confidence: 99%

Dynamics of Autumn Migration of the Acrocephalus Warblers Through the Polish Baltic Coast

Kozłowska

Stępniewska

Stêpniewski

et al. 2009

Ring

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1990-2002 and 2003-2005. The most numerous species caught at all the stations was the Reed Warbler, whereas the Aquatic Warbler was caught only sporadically. Long-term number dynamics from Bukowo-Kopañ and Mierzeja Wioelana showed considerable fluctuations for the first four species, which could have been influenced by weather or habitat changes, or they could have reflected long-term population cycles. Strong correlations between the numbers of species preferring reeds might indicate habitat basis of the fluctuations. Seasonal migration dynamics were also similar, with the peak of migration in mid-August. However, the dynamics from Dru¿no suggested that the real peak of migration occurred earlier. Median dates of the Reed Warbler migration at Bukowo-Kopañ showed marked fluctuations, whereas at Mierzeja Wioelana they were delayed significantly; these changes were probably connected with climate changes.

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Does seasonality drive spatial patterns in demography? Variation in survival in African reed warblersAcrocephalus baeticatusacross southern Africa does not reflect global patterns

Jansen

Abadi

Harebottle

et al. 2014

Ecology and Evolution

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Among birds, northern temperate species generally have larger clutches, shorter development periods and lower adult survival than similarly-sized southern and tropical species. Even though this global pattern is well accepted, the driving mechanism is still not fully understood. The main theories are founded on the differing environmental seasonality of these zones (higher seasonality in the North). These patterns arise in cross-species comparisons, but we hypothesized that the same patterns should arise among populations within a species if different types of seasonality select for different life histories. Few studies have examined this. We estimated survival of an azonal habitat specialist, the African reed warbler, across the environmentally diverse African subcontinent, and related survival to latitude and to the seasonality of the different environments of their breeding habitats. Data (1998–2010) collected through a public ringing scheme were analyzed with hierarchical capture-mark-recapture models to determine resident adult survival and its spatial variance across sixteen vegetation units spread across four biomes. The models were defined as state-space multi-state models to account for transience and implemented in a Bayesian framework. We did not find a latitudinal trend in survival or a clear link between seasonality and survival. Spatial variation in survival was substantial across the sixteen sites (spatial standard deviation of the logit mean survival: 0.70, 95% credible interval (CRI): 0.33–1.27). Mean site survival ranged from 0.49 (95% CRI: 0.18–0.80) to 0.83 (95% CRI: 0.62–0.97) with an overall mean of 0.67 (95% CRI: 0.47–0.85). A hierarchical modeling approach enabled us to estimate spatial variation in survival of the African reed warbler across the African subcontinent from sparse data. Although we could not confirm the global pattern of higher survival in less seasonal environments, our findings from a poorly studied region contribute to the study of life-history strategies.

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Survival rates of adult Reed WarblersAcrocephalus scirpaceusat a northern and southern site in England

Cited by 21 publications

References 29 publications

Conditions at autumn stopover sites affect survival of a migratory passerine

Conditions at autumn stopover sites affect survival of a migratory passerine

Dynamics of Autumn Migration of the Acrocephalus Warblers Through the Polish Baltic Coast

Does seasonality drive spatial patterns in demography? Variation in survival in African reed warblersAcrocephalus baeticatusacross southern Africa does not reflect global patterns

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