Migratory and resident waders differ in risk taking on the wintering grounds

Area of Science:

• Ornithology
• Behavioral Ecology
• Conservation Biology

Background:

• Animals, particularly birds, must balance predation risk with energy expenditure when deciding to flee.
• Flight initiation distance (FID) quantifies risk-taking, reflecting the trade-off between escaping predators and the costs of flight.
• Most studies on FID focus on breeding birds, leaving wintering populations under-researched.

Purpose of the Study:

• To investigate risk-taking behavior (FID) in migratory and resident wader populations on their African wintering grounds.
• To identify factors influencing FID, including body mass, reproductive effort, and flock size.
• To compare FID between migratory and resident waders, controlling for potential confounding variables.

Main Methods:

• Phylogenetically informed comparative analyses were used to study waders (Charadriiformes).
• Flight initiation distance (FID) was measured as the primary indicator of risk-taking.
• Statistical models controlled for body mass, reproductive effort, and flock size to compare FID between migratory and resident species.

Main Results:

• A significant correlation was found between FID and body mass, and marginally with reproductive effort in wintering waders.
• Flock size did not show a significant correlation with FID.
• Resident wader species exhibited shorter FID compared to migratory species, even after accounting for other factors.

Conclusions:

• Differences in FID between migratory and resident waders suggest that environmental familiarity and prior experience influence risk perception.
• These findings have implications for understanding avian conservation needs, particularly for migratory species in their non-breeding habitats.
• Further research into the role of experience and environmental knowledge in shaping anti-predator behavior is warranted.