Oct 4, 2015

Local and population-level responses of Greater sage-grouse to oil and gas development and climatic variation in Wyoming

BioRxiv : the Preprint Server for Biology
Rob R RameyAlexander S Ivey

Abstract

Background: Spatial scale is important when studying ecological processes. The Greater sage-grouse (Centrocercus urophasianus) is a large sexually dimorphic tetraonid that is endemic to the sagebrush biome of western North America. The impacts of oil and gas development at individual leks has been well-documented. However, no previous studies have quantified the population-level response. Methods: Hierarchical models were used to estimate the effects of the areal disturbance due to well pads as well as climatic variation on individual lek counts and Greater sage-grouse populations (management units) over 32 years. The lek counts were analyzed using General Linear Mixed Models while the management units were analyzed using Gompertz Population Dynamic Models. The models were fitted using frequentist and Bayesian methods. An information-theoretic approach was used to identify the most important spatial scale and time lags. The relative importance of oil and gas and climate at the local and population-level scales was assessed using information-theoretic (Akaike's weights) and estimation (effect size) statistics. Results: At the local scale, oil and gas was an important negative predictor of the lek count. At the population scale, ...Continue Reading

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Mentioned in this Paper

Study
Spatial Distribution
Buccal Fat Pad
Artemisia (plant)
Artemisia spinescens
Summation (Function)
Oils
Disease Management
Local
Diagnostic Procedure

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