Behavioral aspects of waterbirds

Area of Science:

• Ecology
• Ornithology
• Environmental Science

Background:

• Estuaries are vital habitats for waterbirds, providing foraging, resting, and nesting sites.
• Avifauna dynamics are influenced by environmental variables such as time of day, tide, temperature, and wind speed.

Purpose of the Study:

• To evaluate the behavioral aspects of aquatic birds in Brazilian estuaries.
• To determine the influence of environmental variables on waterbird activities and site usage.

Main Methods:

• Monthly bird counts conducted at river mouths in Santa Catarina, Brazil, from June 2015 to May 2016.
• Data analysis included Kruskal-Wallis, Bray-Curtis similarity, Indicator Species Analysis, and Canonical Correlation Analysis.

Main Results:

• 44 waterbird species were recorded, including 10 migratory species; foraging and resting were the most common behaviors.
• Tide height, temperature, and rainfall were correlated with bird behaviors, with resting activity showing a positive correlation with all variables.
• Species exhibited distinct microhabitat preferences, with 17 species associated with one microhabitat and 15 with multiple.

Conclusions:

• Environmental factors significantly influence waterbird behavior and site utilization in estuaries.
• Habitat heterogeneity is crucial for supporting diverse waterbird communities and their coexistence.
• Understanding species-specific responses to environmental variables is key for effective conservation strategies.