Migration shapes senescence in a long-lived bird.

Area of Science:

• Ecology
• Evolutionary Biology
• Gerontology

Background:

• Migration is crucial for organismal fitness but its effect on aging is understudied.
• Understanding senescence in long-lived species is vital for conservation and evolutionary insights.

Purpose of the Study:

• To investigate the long-term effects of migration on mortality and reproduction across the lifespan.
• To explore the relationship between migratory behavior and senescence in Greater Flamingos.

Main Methods:

• Utilized a 44-year dataset of Greater Flamingo (Phoenicopterus roseus) with ring-resighting data.
• Analyzed age-specific trajectories of survival and breeding probability for resident and migratory individuals.

Main Results:

• Resident flamingos showed superior early-life survival and breeding probability but experienced accelerated aging.
• Migratory flamingos had higher early mortality but exhibited slower rates of senescence in old age.
• Both resident and migratory groups had similar breeding success rates.

Conclusions:

• Migration significantly influences lifespan trajectories and aging processes in long-lived vertebrates.
• Behavioral strategies, like migration, play a key role in the biology of aging.
• This study provides critical insights into the evolutionary trade-offs between migration and senescence.