منابع مشابه
Trophic interactions in a high arctic snow goose colony.
We examined the role of trophic interactions in structuring a high arctic tundra community characterized by a large breeding colony of greater snow geese (Chen caerulescens atlantica). According to the exploitation ecosystem hypothesis of Oksanen et al. (1981), food chains are controlled by top-down interactions. However, because the arctic primary productivity is low, herbivore populations are...
متن کاملFemale age and egg size in the Lesser Snow Goose
younger birds laying slightly smaller eggs in each position within the laying sequence. Some physiological maturation process was probably responsible for the smaller eggs younger birds laid because the pattern held within individuals. However, changes in egg size and shape may be due to breeding experience rather than age itself. We detected no evidence for age-specific differences in egg size...
متن کاملEcological Aspects of the Blue-snow Goose Complex
T}tE taxonomic relationship of the Blue Goose (Chen caerulesceus cacrulescens) and the Lesser Snow' Goose (Chcn hyperborca hyperborea) has long created controversy among avian systematists, e.g., Blaauw (1908), Soper (1930), Sutton (1932), Manning (1942), and Manning et aI. (1956). I believe that the two forms are conspecific and that the species consists of two subspecies: a large form, Chcn c...
متن کاملSnow water equivalent interpolation for the Colorado River Basin from snow telemetry (SNOTEL) data
[1] Inverse weighted distance and regression nonexact techniques were evaluated for interpolating methods snow water equivalent (SWE) across the entire Colorado River Basin of the western United States. A 1-km spacing was used for the gridding of snow telemetry (SNOTEL) measurements for the years 1993, 1998, and 1999, which on average, represented higher than average, average, and lower than av...
متن کاملEvaluation of SNODAS snow depth and snow water equivalent estimates for the Colorado Rocky Mountains, USA
The National Weather Service’s Snow Data Assimilation (SNODAS) program provides daily, gridded estimates of snow depth, snow water equivalent (SWE), and related snow parameters at a 1-km resolution for the conterminous USA. In this study, SNODAS snow depth and SWE estimates were compared with independent, ground-based snow survey data in the Colorado Rocky Mountains to assess SNODAS accuracy at...
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ژورنال
عنوان ژورنال: The Auk
سال: 1907
ISSN: 0004-8038,1938-4254
DOI: 10.2307/4070856