Home on the range: factors explaining partial migration of African buffalo in a tropical environment.

PloS One
Robin NaidooMartin Wegmann

Abstract

Partial migration (when only some individuals in a population undertake seasonal migrations) is common in many species and geographical contexts. Despite the development of modern statistical methods for analyzing partial migration, there have been no studies on what influences partial migration in tropical environments. We present research on factors affecting partial migration in African buffalo (Syncerus caffer) in northeastern Namibia. Our dataset is derived from 32 satellite tracking collars, spans 4 years and contains over 35,000 locations. We used remotely sensed data to quantify various factors that buffalo experience in the dry season when making decisions on whether and how far to migrate, including potential man-made and natural barriers, as well as spatial and temporal heterogeneity in environmental conditions. Using an information-theoretic, non-linear regression approach, our analyses showed that buffalo in this area can be divided into 4 migratory classes: migrants, non-migrants, dispersers, and a new class that we call "expanders". Multimodel inference from least-squares regressions of wet season movements showed that environmental conditions (rainfall, fires, woodland cover, vegetation biomass), distance to the...Continue Reading

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Oct 2, 2013·BMC Ecology·Nicolas Gaidet, Philippe Lecomte
Feb 28, 2013·Epidemiology and Infection·A CaronM de Garine-Wichatitsky
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Nov 26, 2015·Ecological Applications : a Publication of the Ecological Society of America·Hadrien VanthommeAlfonso Alonso

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Software Mentioned

LoCoH
AICcmodavg
adehabitat ( Neighbor Convex Hull script
R
KAZA
Quickbird

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