کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4378132 1617537 2008 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Linking foraging behavior to population density: An assessment of GMM models for Dall sheep
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک بوم شناسی، تکامل، رفتار و سامانه شناسی
پیش نمایش صفحه اول مقاله
Linking foraging behavior to population density: An assessment of GMM models for Dall sheep
چکیده انگلیسی

We adapted Owen-Smith's general growth-metabolism-mortality (GMM) model to estimate the abundance of a population of Dall sheep (Ovis dalli dalli) in the southwest Yukon, Canada. Estimated sheep densities using the GMM approach (18–32 sheep/km2) approximated long-term aerial survey data (20.2–29.6 sheep/km2) when biologically realistic levels of parameter variation were introduced. Sheep population growth rate based on the GMM model was most sensitive to the metabolic conversion of forage into sheep biomass, rate of vegetation attrition, and mortality rate during winter. Model estimates may be improved with better estimates of metabolic conversion of forage into sheep body mass, vegetation attrition, incorporation of inter-annual variability, and stratification by sex and age classes. Overall, GMM models using mechanistic physiological and behavioral information may provide a complimentary approach to aerial censuses for estimating ungulate population abundance.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ecological Modelling - Volume 211, Issues 3–4, 10 March 2008, Pages 396–402
نویسندگان
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