Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Spatial GLS model with an exponential correlation structure, explaining variation in sampling effort among countries
| Variable | Slope ± SE | t84 |
|---|---|---|
| Primate species richness | 1.241 ± 0.290 | 4.273*** |
| GDP per capita (USD) | 0.437 ± 0.246 | 1.778 |
| Airport density (airport/km2) | −3.559 ± 3.041 | −1.170 |
ρ = 1.938; GDP = gross domestic product; ***P < 0.001.
