Distributions for five key tidal marsh-dependent bird species were modeled using boosted regression trees (Elith et al. 2008). Both methods are able to fit non-linear functions between environmental variables and the presence/absence of a species. Map values represent the number of birds per hectare of a species.
Bird species modeled: Common yellowthroat, black rail, clapper rail, marsh wren, song sparrow.
Bird Density Projections were created for each of the species for the following time periods and accretion/ sea level rise scenarios:
Current Density Projections
2030-2100, low sediment, low organic, 0.52 m sea level rise
2030 - 2100, low sediment, low organic, 1.65 m sea level rise
2030 - 2100, high sediment, low organic, 0.52 m sea level rise
2030 - 2100, high sediment, low organic, 1.65 m sea level rise
