El Niño–Southern Oscillation influences annual survival of a migratory songbird at a regional scale

LaManna, Joseph A.; George, T. Luke; Saracco, James F.; Nott, M. Philip; DeSante, David F.

doi:10.1525/auk.2012.12017

Cited by 38 publications

(47 citation statements)

References 29 publications

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“…As a result, Reed Warblers are very sensitive to the prevailing environmental conditions at important stopover sites. Our results are in line with those reported in numerous earlier studies of various avian species that provide evidence for relationships between survival and/or population levels and indices of wet season rainfall at wintering areas (Peach et al 1991;Baillie and Peach 1992;Schaub et al 2005, García-Pérez et al 2014Ockendon et al 2014;Johnston et al 2016) or along migratory routes (LaManna et al 2012). However, we did not find a similar relationship between survival and precipitation for spring stopover sites or wintering areas.…”

Section: Discussionsupporting

confidence: 93%

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: 93%

Conditions at autumn stopover sites affect survival of a migratory passerine

Hałupka

Wierucka

Sztwiertnia³

et al. 2017

J Ornithol

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“…For example, we now suggest that the leapfrog migration hypothesis be tested using geolocators on southern vs. northern populations. Our identification of general regions of wintering for various breeding populations is also amenable to the testing of hypotheses associated with largescale environmental parameters such as those associated with climate (Sillett et al 2000, Nott et al 2002, LaManna et al 2012 or environmental conditions on the wintering grounds. For instance, future research could focus on testing whether patterns of population trends are associated with local rainfall and temperature parameters (Nott et al 2002, Ambrosini et al 2011b, LaManna et al 2012 or primary productivity in the wintering grounds measured by the Normalized Difference Vegetation Index (NDVI) (Ambrosini et al 2011a).…”

Section: Discussionmentioning

confidence: 99%

A multi‐isotope (δ²H, δ¹³C, δ¹⁵N) approach to establishing migratory connectivity of Barn Swallow (Hirundo rustica)

García-Pérez

Hobson

2014

Ecosphere

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Establishing geographic links between different stages of the annual cycle of migratory species is fundamental to evaluating factors limiting their populations. Stable isotope measurements (δ13C, δ15N, and δ2H) of feathers combined with a knowledge of how these isotopes are structured spatially in foodwebs can be used to establish molt origins and migratory connectivity. Here, we investigated patterns of migratory connectivity between North American breeding grounds and South American wintering grounds of stable (n = 3) and declining (n = 9) populations of Barn Swallow (Hirundo rustica) in North America using a probabilistic assignment to multi‐isotope feather clusters derived for 488 winter‐grown feathers collected during the breeding season (2009 to 2012). Our study did not find evidence for differential degree of migratory connectivity between increasing/stable and declining populations of Barn Swallows but found a longitudinal structure in breeding and wintering ground origins of populations. Probable wintering areas for northern and western breeding birds corresponded with western regions of South America, while birds breeding in southern and eastern North America tended to occupy areas in north‐eastern South America. Possible factors contributing to the differential population trends between stable or increasing and declining breeding populations could be related to habitat quality of the different wintering areas, changes in climate, and the cost of long‐distance migration. The use of a multi‐isotope approach and the combination of prior information on geographic distribution of vegetation types, based on δ13C measurements, effectively constrained geographic origins of swallows and our approach can be applied to defining migratory connectivity for other species.

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“…We also limited our analyses to captures of adult (after hatch-year) birds, and used Cormack-Jolly-Seber models to estimate annual adult apparent survival probability between breeding seasons, hereafter referred to as survival. For the climate/regional analyses, we developed an a priori set of candidate models to estimate survival, accounting for transient individuals (31), with covariates for climate indices, latitude, longitude, and time, as well as null models following LaManna et al (14).…”

Section: Methodsmentioning

confidence: 99%

“…However, these studies used animal count data that likely underestimate impacts because, even in the face of high mortality, recruitment and immigration may mask population declines (11). WNV is hypothesized to influence bird populations through reductions in survival, which can be influenced by various biotic and abiotic factors, including age (12), climate (13,14), and regional environment heterogeneity (15). In addition, a number of studies suggest that the impact of WNV on bird populations increases with human land use (16,17).…”

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confidence: 99%

Persistent impacts of West Nile virus on North American bird populations

George

Harrigan

LaManna

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

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Since its introduction to North America in 1999, West Nile virus (WNV) has had devastating impacts on native host populations, but to date these impacts have been difficult to measure. Using a continental-scale dataset comprised of a quarter-million birds captured over nearly two decades and a recently developed model of WNV risk, we estimated the impact of this emergent disease on the survival of avian populations. We find that populations were negatively affected by WNV in 23 of the 49 species studied (47%). We distinguished two groups of species: those for which WNV negatively impacted survival only during initial spread of the disease (n = 11), and those that show no signs of recovery since disease introduction (n = 12). Results provide a novel example of the taxonomic breadth and persistent impacts of this wildlife disease on a continental scale. Phylogenetic analyses further identify groups (New World sparrows, finches, and vireos) disproportionally affected by temporary or persistent WNV effects, suggesting an evolutionary dimension of disease risk. Identifying the factors affecting the persistence of a disease across host species is critical to mitigating its effects, particularly in a world marked by rapid anthropogenic change.

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El Niño–Southern Oscillation influences annual survival of a migratory songbird at a regional scale

Cited by 38 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

A multi‐isotope (δ²H, δ¹³C, δ¹⁵N) approach to establishing migratory connectivity of Barn Swallow (Hirundo rustica)

Persistent impacts of West Nile virus on North American bird populations

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El Niño–Southern Oscillation influences annual survival of a migratory songbird at a regional scale

Cited by 38 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

A multi‐isotope (δ2H, δ13C, δ15N) approach to establishing migratory connectivity of Barn Swallow (Hirundo rustica)

Persistent impacts of West Nile virus on North American bird populations

Contact Info

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A multi‐isotope (δ²H, δ¹³C, δ¹⁵N) approach to establishing migratory connectivity of Barn Swallow (Hirundo rustica)