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Fitness consequences of different migratory strategies in partially migratory populations: a multi-taxa meta-analysis

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@article{eeb20c1ebad04975b4eda4d506677928,
title = "Fitness consequences of different migratory strategies in partially migratory populations: a multi-taxa meta-analysis",
abstract = "1.Partial migration – wherein migratory and non-migratory individuals exist within the same population – represents a behavioural dimorphism; for it to persist over time, both strategies should yield equal individual fitness. This balance may be maintained through trade-offs where migrants gain survival benefits by avoiding unfavourable conditions, while residents gain breeding benefits from early access to resources. 2.There has been little overarching quantitative analysis of the evidence for this fitness balance. As migrants – especially long-distance migrants – may be particularly vulnerable to environmental change, it is possible that recent anthropogenic impacts could drive shifts in fitness balances within these populations.3.We tested these predictions using a multi-taxa meta-analysis. Of 2939 reviewed studies, 23 contained suitable information for meta-analysis, yielding 129 effect sizes. 4.Of these, 73% (n=94) reported higher resident fitness, 22% (n=28) reported higher migrant fitness, and 5% (n=7) reported equal fitness. Once weighted for precision, we found balanced fitness benefits across the entire dataset, but a consistently higher fitness of residents over migrants in birds and herpetofauna (the best-sampled groups). Residency benefits were generally associated with survival, not breeding success, and increased with the number of years of data over which effect sizes were calculated, suggesting deviations from fitness parity are not due to sampling artefacts. 5.A pervasive survival benefit to residency documented in recent literature could indicate that increased exposure to threats associated with anthropogenic change faced by migrating individuals may be shifting the relative fitness balance between strategies. ",
keywords = "behavioural dimorphism, climate change, evolution of migration, migratory strategy, movement ecology, partial migration, MIGRANT, PREDATION, RESIDENT, SHIFTS, BIRD-MIGRATION, EVOLUTION, CLIMATE-CHANGE LEADS, SELECTION, REPRODUCTIVE SUCCESS, PHENOLOGY",
author = "Claire Buchan and James Gilroy and In{\^e}s Catry and Aldina Franco",
note = "{\textcopyright} 2019 The Authors. Journal of Animal Ecology published by John Wiley & Sons Ltd on behalf of British Ecological Society.",
year = "2020",
month = mar,
doi = "10.1111/1365-2656.13155",
language = "English",
volume = "89",
pages = "678--690",
journal = "Journal of Animal Ecology",
issn = "0021-8790",
publisher = "Wiley",
number = "3",

}

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TY - JOUR

T1 - Fitness consequences of different migratory strategies in partially migratory populations: a multi-taxa meta-analysis

AU - Buchan, Claire

AU - Gilroy, James

AU - Catry, Inês

AU - Franco, Aldina

N1 - © 2019 The Authors. Journal of Animal Ecology published by John Wiley & Sons Ltd on behalf of British Ecological Society.

PY - 2020/3

Y1 - 2020/3

N2 - 1.Partial migration – wherein migratory and non-migratory individuals exist within the same population – represents a behavioural dimorphism; for it to persist over time, both strategies should yield equal individual fitness. This balance may be maintained through trade-offs where migrants gain survival benefits by avoiding unfavourable conditions, while residents gain breeding benefits from early access to resources. 2.There has been little overarching quantitative analysis of the evidence for this fitness balance. As migrants – especially long-distance migrants – may be particularly vulnerable to environmental change, it is possible that recent anthropogenic impacts could drive shifts in fitness balances within these populations.3.We tested these predictions using a multi-taxa meta-analysis. Of 2939 reviewed studies, 23 contained suitable information for meta-analysis, yielding 129 effect sizes. 4.Of these, 73% (n=94) reported higher resident fitness, 22% (n=28) reported higher migrant fitness, and 5% (n=7) reported equal fitness. Once weighted for precision, we found balanced fitness benefits across the entire dataset, but a consistently higher fitness of residents over migrants in birds and herpetofauna (the best-sampled groups). Residency benefits were generally associated with survival, not breeding success, and increased with the number of years of data over which effect sizes were calculated, suggesting deviations from fitness parity are not due to sampling artefacts. 5.A pervasive survival benefit to residency documented in recent literature could indicate that increased exposure to threats associated with anthropogenic change faced by migrating individuals may be shifting the relative fitness balance between strategies.

AB - 1.Partial migration – wherein migratory and non-migratory individuals exist within the same population – represents a behavioural dimorphism; for it to persist over time, both strategies should yield equal individual fitness. This balance may be maintained through trade-offs where migrants gain survival benefits by avoiding unfavourable conditions, while residents gain breeding benefits from early access to resources. 2.There has been little overarching quantitative analysis of the evidence for this fitness balance. As migrants – especially long-distance migrants – may be particularly vulnerable to environmental change, it is possible that recent anthropogenic impacts could drive shifts in fitness balances within these populations.3.We tested these predictions using a multi-taxa meta-analysis. Of 2939 reviewed studies, 23 contained suitable information for meta-analysis, yielding 129 effect sizes. 4.Of these, 73% (n=94) reported higher resident fitness, 22% (n=28) reported higher migrant fitness, and 5% (n=7) reported equal fitness. Once weighted for precision, we found balanced fitness benefits across the entire dataset, but a consistently higher fitness of residents over migrants in birds and herpetofauna (the best-sampled groups). Residency benefits were generally associated with survival, not breeding success, and increased with the number of years of data over which effect sizes were calculated, suggesting deviations from fitness parity are not due to sampling artefacts. 5.A pervasive survival benefit to residency documented in recent literature could indicate that increased exposure to threats associated with anthropogenic change faced by migrating individuals may be shifting the relative fitness balance between strategies.

KW - behavioural dimorphism

KW - climate change

KW - evolution of migration

KW - migratory strategy

KW - movement ecology

KW - partial migration

KW - MIGRANT

KW - PREDATION

KW - RESIDENT

KW - SHIFTS

KW - BIRD-MIGRATION

KW - EVOLUTION

KW - CLIMATE-CHANGE LEADS

KW - SELECTION

KW - REPRODUCTIVE SUCCESS

KW - PHENOLOGY

UR - http://www.scopus.com/inward/record.url?scp=85076929570&partnerID=8YFLogxK

U2 - 10.1111/1365-2656.13155

DO - 10.1111/1365-2656.13155

M3 - Article

C2 - 31777950

VL - 89

SP - 678

EP - 690

JO - Journal of Animal Ecology

JF - Journal of Animal Ecology

SN - 0021-8790

IS - 3

ER -

ID: 169480460