Range-wide selection of catchments for Pacific salmon conservation

Area of Science:

• Ecology
• Conservation Biology
• Fisheries Science

Background:

• Global decline in freshwater ecosystem quality necessitates transboundary conservation efforts.
• Data gaps hinder identification of critical areas for international conservation initiatives.
• Pacific salmon (Oncorhynchus spp.) are key indicators of northern Pacific ecosystem health.

Purpose of the Study:

• To develop a biological measure for assessing conservation value of Pacific salmon catchments.
• To identify and map high-value salmon catchments across Canada, China, Japan, Russia, and the United States.
• To inform proactive conservation strategies for ensuring salmon resilience.

Main Methods:

• Utilized abundance and life-history richness data for six Pacific salmon species.
• Employed a model-based approach to address and fill data gaps in catchment assessments.
• Analyzed catchment characteristics, including human development, agriculture, and dam presence.

Main Results:

• Identified high-conservation-value catchments spanning from California to northern Russia.
• Found that high-value catchments were less impacted by agriculture and dams.
• Noted that only 1% of high-value areas were located within existing biodiversity reserves.

Conclusions:

• A mosaic of conservation strategies in healthy salmon catchments is vital for future resilience.
• The developed measure provides an initial map to guide proactive, transboundary conservation actions.
• Conservation efforts must consider areas with high biological value, even those impacted by human activity.