Non-breeding conditions induce carry-over effects on survival of migratory birds

Identifying the processes that limit populations is a foundational objective of ecology and an urgent need for conservation. For migratory animals, researchers must study individuals throughout their annual cycles to determine how environmental conditions limit demographic rates within each period o...

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Veröffentlicht in:Current biology 2024-11, Vol.34 (21), p.5097-5103.e3
Hauptverfasser: Cooper, Nathan W., Yanco, Scott W., Rushing, Clark S., Sillett, T. Scott, Marra, Peter P.
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container_end_page 5103.e3
container_issue 21
container_start_page 5097
container_title Current biology
container_volume 34
creator Cooper, Nathan W.
Yanco, Scott W.
Rushing, Clark S.
Sillett, T. Scott
Marra, Peter P.
description Identifying the processes that limit populations is a foundational objective of ecology and an urgent need for conservation. For migratory animals, researchers must study individuals throughout their annual cycles to determine how environmental conditions limit demographic rates within each period of the annual cycle and also between periods through carry-over effects and seasonal interactions.1,2,3,4,5,6 Our poor understanding of the rates and causes of avian migration mortality7 hinders the identification of limiting factors and the reversal of widespread avian population declines.8,9 Here, we implement new methods to estimate apparent survival (hereafter survival) during migration directly from automated telemetry data10 in Kirtland’s Warblers (Setophaga kirtlandii) and indirectly from mark-recapture data in Black-throated Blue Warblers (S. caerulescens). Previous experimental and observational studies of our focal species and other migratory songbirds have shown strong effects of Caribbean precipitation and habitat quality on food availability,11,12,13,14 body condition,12,13,14,15,16,17,18,19 migration timing,11,12,15,16,20,21,22,23 natal dispersal,24,25 range dynamics,26 reproductive success,20,22,27 and annual survival.18,19,20,23,28,29,30,31 Building on this research, we test the hypotheses that environmental conditions during the non-breeding period affect subsequent survival during spring migration and breeding. We found that reduced precipitation and environmental productivity in the non-breeding period strongly influenced survival in both species, primarily by reducing survival during spring migration. Our results indicate that climate-driven environmental conditions can carry over to affect survival in subsequent periods and thus likely play an important role in year-round population dynamics. These lethal carry-over effects may be widespread and are likely magnified by intensifying climate change. •New methods allow for direct and indirect estimation of survival during migration•Poor non-breeding conditions affect songbird survival during migration and breeding•Lethal carry-over effects may be widespread in other migratory taxa•Climate change is likely to magnify these effects and endanger animal populations Using new methods to estimate songbird survival during the non-breeding, spring migration, and breeding periods, Cooper et al. show that drought and poor environmental productivity in winter carry over to reduce survival during migration
doi_str_mv 10.1016/j.cub.2024.09.015
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For migratory animals, researchers must study individuals throughout their annual cycles to determine how environmental conditions limit demographic rates within each period of the annual cycle and also between periods through carry-over effects and seasonal interactions.1,2,3,4,5,6 Our poor understanding of the rates and causes of avian migration mortality7 hinders the identification of limiting factors and the reversal of widespread avian population declines.8,9 Here, we implement new methods to estimate apparent survival (hereafter survival) during migration directly from automated telemetry data10 in Kirtland’s Warblers (Setophaga kirtlandii) and indirectly from mark-recapture data in Black-throated Blue Warblers (S. caerulescens). Previous experimental and observational studies of our focal species and other migratory songbirds have shown strong effects of Caribbean precipitation and habitat quality on food availability,11,12,13,14 body condition,12,13,14,15,16,17,18,19 migration timing,11,12,15,16,20,21,22,23 natal dispersal,24,25 range dynamics,26 reproductive success,20,22,27 and annual survival.18,19,20,23,28,29,30,31 Building on this research, we test the hypotheses that environmental conditions during the non-breeding period affect subsequent survival during spring migration and breeding. We found that reduced precipitation and environmental productivity in the non-breeding period strongly influenced survival in both species, primarily by reducing survival during spring migration. Our results indicate that climate-driven environmental conditions can carry over to affect survival in subsequent periods and thus likely play an important role in year-round population dynamics. These lethal carry-over effects may be widespread and are likely magnified by intensifying climate change. •New methods allow for direct and indirect estimation of survival during migration•Poor non-breeding conditions affect songbird survival during migration and breeding•Lethal carry-over effects may be widespread in other migratory taxa•Climate change is likely to magnify these effects and endanger animal populations Using new methods to estimate songbird survival during the non-breeding, spring migration, and breeding periods, Cooper et al. show that drought and poor environmental productivity in winter carry over to reduce survival during migration and breeding. 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Previous experimental and observational studies of our focal species and other migratory songbirds have shown strong effects of Caribbean precipitation and habitat quality on food availability,11,12,13,14 body condition,12,13,14,15,16,17,18,19 migration timing,11,12,15,16,20,21,22,23 natal dispersal,24,25 range dynamics,26 reproductive success,20,22,27 and annual survival.18,19,20,23,28,29,30,31 Building on this research, we test the hypotheses that environmental conditions during the non-breeding period affect subsequent survival during spring migration and breeding. We found that reduced precipitation and environmental productivity in the non-breeding period strongly influenced survival in both species, primarily by reducing survival during spring migration. Our results indicate that climate-driven environmental conditions can carry over to affect survival in subsequent periods and thus likely play an important role in year-round population dynamics. These lethal carry-over effects may be widespread and are likely magnified by intensifying climate change. •New methods allow for direct and indirect estimation of survival during migration•Poor non-breeding conditions affect songbird survival during migration and breeding•Lethal carry-over effects may be widespread in other migratory taxa•Climate change is likely to magnify these effects and endanger animal populations Using new methods to estimate songbird survival during the non-breeding, spring migration, and breeding periods, Cooper et al. show that drought and poor environmental productivity in winter carry over to reduce survival during migration and breeding. 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Previous experimental and observational studies of our focal species and other migratory songbirds have shown strong effects of Caribbean precipitation and habitat quality on food availability,11,12,13,14 body condition,12,13,14,15,16,17,18,19 migration timing,11,12,15,16,20,21,22,23 natal dispersal,24,25 range dynamics,26 reproductive success,20,22,27 and annual survival.18,19,20,23,28,29,30,31 Building on this research, we test the hypotheses that environmental conditions during the non-breeding period affect subsequent survival during spring migration and breeding. We found that reduced precipitation and environmental productivity in the non-breeding period strongly influenced survival in both species, primarily by reducing survival during spring migration. Our results indicate that climate-driven environmental conditions can carry over to affect survival in subsequent periods and thus likely play an important role in year-round population dynamics. 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subjects Animal Migration
Animals
annual cycle
carry-over effect
Climate Change
Ecosystem
environmental productivity
migration survival
migratory birds
Population Dynamics
precipitation
seasonal interaction
seasonal survival
Seasons
Songbirds - physiology
title Non-breeding conditions induce carry-over effects on survival of migratory birds
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