Quantifying individual specialization using tracking data: a case study on two species of albatrosses.

Area of Science:

• Ecology
• Animal Behaviour
• Conservation Biology

Background:

• Predictive distribution models often assume uniform species niches.
• Growing evidence suggests individual specialization in narrower environmental niches.
• Individual specialization has been understudied in multidimensional environmental space.

Purpose of the Study:

• To develop a novel method for quantifying multidimensional individual environmental specialization.
• To assess individual environmental specialization and site fidelity in seabirds.
• To understand the implications of individual specialization for population dynamics and conservation.

Main Methods:

• Developed a hypervolume comparison method to quantify individual specialization.
• Applied the method to analyze environmental niche dimensions (sea surface temperature, eddy kinetic energy, depth).
• Utilized satellite tracking data for black-browed and grey-headed albatrosses.

Main Results:

• Found evidence of site fidelity in both albatross species.
• Identified significant environmental specialization in individual grey-headed albatrosses, but not black-browed albatrosses.
• Demonstrated the applicability of the method for assessing individual niche breadth.

Conclusions:

• Individual specialization varies between species and can influence population responses to environmental change.
• The new method allows for a more comprehensive understanding of individual niche partitioning.
• Findings have critical implications for predicting species' resilience to climate change and anthropogenic impacts.