Niche Position and Niche Breadth Effects on Population Abundances: A Case Study of New World Warblers (Parulidae)

In this study, we investigated the influence of niche position and breadth on the abundance of 47 species of birds belonging to the Parulidae family, commonly known as New World Warblers. We obtained data on abundance and presence records spanning the reproductive distribution of these species and employed the outlying mean index (OMI) analysis to calculate niche position and niche breadth. We assessed the relationship between abundance metrics and niche characteristics using phylogenetic regressions to account for the non-independence resulting from phylogenetic ancestry.OMI analysis inputs: - dudi.rds which is the PCA of environmental variables -input_presences_OMI.csv. Data table of presence records with the format needed for OMI analysisPGL analysis input: data table with every predictor, response, and control variable per column: input_pgls.csvDatabases: -Abundance data based on BBS routes: abundance_db.csv -Presences records cleaned from GBIF: presence_record.csv