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Carryover effects of long-distance avian migration are weaker than effects of breeding environment in a partially migratory bird
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Orientador(es)
Resumo(s)
Migration may expose individuals to a wide range of increasing anthropogenic threats. In addition
to direct mortality effects, this exposure may influence post-migratory reproductive fitness. Partial
migration—where a population comprises migrants and residents—represents a powerful opportunity
to explore carryover effects of migration. Studies of partial migration in birds typically examine
short-distance systems; here we studied an unusual system where residents breed in mixed colonies
alongside long-distance trans-Saharan migrants (lesser kestrels (Falco naumanni) in Spain). Combining
geolocator data, stable isotope analysis and resighting data, we examined the effects of this stark
difference in migratory strategy on body condition, breeding phenology and breeding success. We
monitored four colonies in two regions of southern Spain for five consecutive years (2014–2018),
yielding 1962 captures, determining migratory strategy for 141 adult bird-years. Despite a 3000-km
difference in distance travelled, we find no effect of strategy on breeding parameters. We find weak
evidence for a short-term negative carryover effect of migration on body condition, but this was only
apparent in the breeding region with lower primary productivity. Our results indicate that carryover
effects of even highly divergent migratory strategies may be minimal relative to effects of conditions
experienced on breeding grounds
Descrição
Palavras-chave
migratory bird avian migration
Contexto Educativo
Citação
Scientific Reports (2021) 11:935
Editora
Nature