araymund83 / macrorefugia Goto Github PK

#This code is an update from the code used in Stralberg et al. (2018) #It generates the climate-change refugia indices for individual species based on #species distribution model predictions (for birds we use: #2020 Audobon models https://www.audubon.org/climate/survivalbydegrees, documented #in https://conbio.onlinelibrary.wiley.com/doi/full/10.1111/csp2.242)

The biotic velocity (Carroll et al. 2015) is calculated considering the nearest-analog velocity algorithm defined by Hamann et al.(2015), and then applies the distance-decay function to obtain an index ranging from 0 to 1. For a fat-tailed distribution (c = 0.5, and alpha = 8333.33) results in a mean migration rate of 500 m/year (50km/century). Velocity values are averaged over four 3 GCMs (CCSM4, GFDLCM3, INMCM4)

The values of the final product were multiply by 100 to make files smaller.

Spp_refugia_X_ Y

where:

• Spp = bird species 4 code letter X = Representative Concentration Pathway (4.5 or 8.5) Y = year (2025, 2055, 2085)

Project Coordinate System: Albers_Conic_Equal_Area Linear Unit: Meters False Easting: 0.0 False Northing: 0.0 Central Meridian: -96.0 Standard parallel 1: 20.0 Standard parallel 2: 60.0 Latitude of origin: 40.0 Cell size: 1000

Stralberg, D., Carroll, C., Pedlar, J., Wilsey, C., McKenney, D. and Nielsen, S.(2018). Macrorefugia for North American trees and songbirds: Climatic limiting factors and multi-scale topographic influences. Global Ecology and Biogeography.27:6 https://doi.org/10.1111/geb.12731