I am using crowd sourced data on bird observations. (species presence/absence, abundance, time and location) I hope to supplement with in situ point count surveys along transects that represent development and habitat variation. habitat will be detected with remote sensing and multispectral imagery.

I am using R and Tableau.

any recommendations on finding the correlations between

1 species and the changes in habitat?

Multiple species and a single representative species?

functional groups and the habitat?

please share references on statistical treatments.