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A Method for Determining the Onset Year of Intense Browsing

Richard B. Keigley, Michael R. Frisina and Craig Fager
Journal of Range Management
Vol. 56, No. 1 (Jan., 2003), pp. 33-38
DOI: 10.2307/4003878
Stable URL: http://www.jstor.org/stable/4003878
Page Count: 6
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A Method for Determining the Onset Year of Intense Browsing
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Abstract

A survey based on browsing related architectures indicated that browsing level had increased at the Mt. Haggin Wildlife Management Area. We describe a technique for determining the year in which the increase in browsing level occurred. The technique is based on the analysis of stems old enough to have experienced the early period of light browsing; the onset year of intense browsing was determined by using dendrochronology to date the formation of twig clusters produced by intense browsing. Stems from 20 Geyer willow (Salix geyeriana Anderss.) plants were analyzed from each of 6 study sites. Mean onset years at the 6 sites ranged from 1983.1 to 1988.4; the mean onset year for all 6 sites was 1985.4 ± 0.5 SE (N = 120). The reconstructed history was used to evaluate the relationship between moose (Alces alces) number and browse trend. From 1976 to 2000, the winter trend census of moose increased from 7 to 56. The onset of intense browsing in 1985 occurred when 23 moose were counted. /// Un reconocimiento basado en arquitecturas relacionadas de ramoneo indicó que el nivel de ramoneo en el Area de Manejo de Fauna Silvestre Mt. Haggin ha aumentado. Describimos las técnicas para determinar el año en el que ocurrió el nivel de ramoneo aumento. La técnica es basada en el análisis de los tallos lo suficientemente viejos para haber experimentado el periodo inicial del ramoneo ligero; el año inicial del ramoneo intenso se determino usando la dendrocronología para determinar la fecha de formación de los racimos de ramas producidas por el ramoneo intenso. Se analizaron tallos de 20 plantas de "Geyer willow" (Salix geyeriana Anderss.) colectadas en cada uno de los 6 sitios de estudio. La media de los años iniciales en los 6 sitios varió de 1983.1 a 1988.4; la media del año final para todos los sitios fue 1985.4 ± 0.5 SE (N = 120). La historia reconstruida se uso para evaluar la relación entre el número de Alces (alces) y la tendencia de ramoneo. De 1976 al 2000, la tendencia invernal del censo de alces se incremento de 7 a 56. El inicio del ramoneo intensivo en 1985 ocurrió cuando se contaron 23 alces.

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