The Golden-winged Warbler (GWWA) is Umbrella Species of song bird who has experienced international decreases in thier population of about two-thirds since 1966, with current numbers estimated at 410,000 individuals. In New York, their populations have decreased 53% since the 1970's. Major causes for population declines are attributed to decrease in shrublands (preferred habitat) and competition with the Blue-winged Warbler (BWWA), who either out competes GWWA or hybridizes with them. The two species largely utilize the same habitat. This projects aim is to see if the species co-exist here in New York. I used empirical sighting data from Cornell's eBird Program for the two species. All data was normalized to account for any spatial bias. All statistical analysis was done using SpaceStat.
The two maps above show where the highest concentration of Golden-winged Warbler and Blue-winged Warbler sightings (eBird Data) are throughout New York.
This map is an overlay of the two species, where the areas in dark green are where the species co-exist. Visually it appears that throughout NY is mostly Blue-winged Warbler. There are small areas of concentration where both species occur North of Syracuse and near Watertown. I wanted to statistically test whether the species co-exist, which I did in SpaceStat. Results yielded an average r-value of -0.90, which suggests there is a very strong negative correlation between GWWA and BWWA, or in other words the two species do not co-exist.
My final map shows concentration of Golden-winged Warbler that were found in areas where no Blue-winged Warbler. In addition it shows Wildlife Management Areas (WMA) that intersected with these GWWA sightings. The NYS DEC's Young Tree Initiative aims to protect and create habitat for GWWA on WMAs across the state. I would recommend these WMAs for GWWA conservation efforts, since they show incidents of GWWA where BWWA have not also been seen. Since BWWA out competes GWWA across the range knowing these locations is important.
This is a link to my presentation associated with these maps. The slides provide a more detailed explanation of my data.
This website is a portfolio of the GIS Projects I completed in my Geovisualization and Cartography Course at UB.