Hypothesis Testing Are two species identical? Are they more similar than you’d expect based on the distribution of environmental variables in their.

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Presentation transcript:

Hypothesis Testing Are two species identical? Are they more similar than you’d expect based on the distribution of environmental variables in their allopatric ranges?

Hypothesis testing Actual Overlap Distribution of overlaps under null hypothesis

OCCURRENCE RANDOMIZATION Observed overlap Overlap for pseudoreplicate

A. coelestinus A. chlorocyanus

Incumbency Steep environmental gradient Ribbon of unsuitable habitat (tension zone)

Regularization and # Parameters

Model selection ENMTools includes functions for calculating information criteria, so that models may be selected based on a combination of fit and complexity AICc BIC

0.01002 0.01001 0.01000 0.00999 0.00998 Simulated Data

Simulated Data “Truth” + Inference Species Latitude Longitude Hella_imaginarius 33.8103 -116.675 34.744 -120.284 35.6022 -120.17 35.3141 -120.658 35.6399 -120.19 36.5056 -121.868 36.3981 -121.647 36.4427 -121.642 36.9218 -121.833 + Inference

Other tools Useful measurements Removal of duplicate occurrences ENM “breadth” Range overlap Variable correlation Removal of duplicate occurrences Jackknife, bootstrap, spatial cross-validation