Optimal conservation of migratory species

Area of Science:

• Ecology
• Conservation Biology
• Wildlife Management

Background:

• Migratory species represent significant biodiversity, yet conservation planning is challenged by their vast ranges and international borders.
• Current strategies often overlook migratory connectivity, potentially reducing their effectiveness and efficiency.
• Understanding spatial connections between annual cycle stages is crucial for successful conservation.

Purpose of the Study:

• To develop the first framework for optimal conservation strategies for migratory species.
• To address resource allocation for habitat conservation using a decision theoretic approach.
• To evaluate the impact of migratory connectivity on conservation outcomes.

Main Methods:

• Employed a decision theoretic approach with dynamic optimization.
• Modeled conservation for the American redstart (Setophaga ruticilla), a Neotropical-Nearctic migratory bird.
• Compared strategies: 1) maximizing winter abundance, 2) maximizing overall abundance with breeding range constraints using migratory connectivity data (stable-hydrogen isotopes).

Main Results:

• A strategy focused solely on winter habitat maximized winter abundance but risked regional population declines.
• Incorporating migratory connectivity into conservation planning protected the species across its entire range.
• Failure to account for migratory connectivity can lead to regional extinctions.

Conclusions:

• Conservation strategies for migratory animals critically depend on knowledge of migratory connectivity and problem definition.
• The developed framework can identify efficient conservation strategies for diverse migratory taxa globally.
• This approach is applicable to birds, insects, mammals, and marine organisms.