Seasonality structures avian functional diversity and niche packing across North America

Assemblages in seasonal ecosystems undergo striking changes in species composition and diversity across the annual cycle. Despite a long-standing recognition that seasonality structures biogeographic gradients in taxonomic diversity (e.g., species richness), our understanding of how seasonality structures other aspects of biodiversity (e.g., functional diversity) has lagged. Integrating seasonal species distributions with comprehensive data on key morphological traits for bird assemblages across North America, we find that seasonal turnover in functional diversity increases with the magnitude and predictability of seasonality. Furthermore, seasonal increases in bird species richness led to a denser packing of functional trait space, but functional expansion was important, especially in regions with higher seasonality. Our results suggest that the magnitude and predictability of seasonality and total productivity can explain the geography of changes in functional diversity with broader i..., , , # Seasonality structures avian functional diversity and niche packing across North America

[https://doi.org/10.5061/dryad.2547d7wzq](https://doi.org/10.5061/dryad.2547d7wzq)

The following repository includes processed data and code necessary to repeat analyses for the manuscript:

Keyser, S. R., Pauli, J. N., Fink, D., Radeloff, V. C., Pigot, A. L., and B. Zuckerberg. Seasonality Structures Avian Functional Diversity and Niche Packing Across North America.

## Description of the data and file structure

The following data and code is shared as a R Project. The data files list below are contained within the \"Data\" subfolder of the RProject.

Seasonal_FD_Dat_Final.csv contains information on the 5000 randomly sampled sites that were analyzed in the manuscript.
Columns:
Site: Unique identifier for each point location
lat: Point latitude in WGS84 (EPSG: 4326) for each location. Unit: Decimal degree
long: Point longitude in WGS84 (EPSG: 4326) for each location. Unit: Decimal degree
BCR: In...