Climate-Altered Wetlands Challenge Waterbird Use and Migratory Connectivity in Arid Landscapes

Area of Science:

• Ecology
• Climate Science
• Ornithology

Background:

• Arid wetlands are vital for migratory waterbirds.
• Understanding climate change impacts on these habitats is critical for conservation.
• North America's Pacific Flyway faces challenges from changing environmental conditions.

Purpose of the Study:

• To assess changes in waterbird use of Great Basin wetlands.
• To examine the relationship between water availability, climate trends, and avian populations over 100 years.
• To understand the impact of climate-induced wetland degradation on migratory routes.

Main Methods:

• Analyzed water availability and climate trends in the Great Basin over the past century (1915-2015).
• Examined historical and recent data (1980-2015) on waterbird species composition and abundance.
• Correlated changes in wetland hydroperiod and water quality with climate variables.

Main Results:

• Significant climate warming (1980-2015) reduced wetland water volume and altered seasonality.
• Observed substantial shifts in waterbird species composition over time.
• Reduced hydroperiod and lower water quality were linked to decreased waterbird site use and chick survivorship.

Conclusions:

• Climate change is degrading critical freshwater ecosystems in the Great Basin.
• These changes pose a significant threat to the Pacific Flyway, a major continental migratory route.
• The findings provide a model for assessing climate impacts on other migratory flyways globally.