منابع مشابه
Changes in shrub fecundity in fourwing saltbush browsed by cattle
Shrub fecundity is critical to long term persistence of fourwing saltbush (Atriplex canescens (Pursh) Nutt.) populations at our research site on the shortgrass steppe in Colorado. We conducted a 2-year experiment to test hypotheses concerning the impact of cattle-browsing on fecundity-related variables in fourwing saltbush. Protection from cattle browsing was significantly associated with flora...
متن کاملSeasonal changes of pronephros lymphoid tissue in grass carp (Ctenopharingodon idella): a histometrical and histological study
The major lymphoid tissues in teleost fish are the kidneys, thymus, spleen and mucosa-associatedlymphoid tissue including the skin, gills and intestine. The head of kidney (pronephros) is an importanthaematopoietic organ and has morphological similarities with the bone marrow in higher vertebrates. In thisstudy, during 12 months from August 2002 to July 2003, 120 grass carp (10 fish/month) were...
متن کاملSeasonal Changes in Coat Characters in Cattle
Cattle go through a regular seasonal cycle of hair growth and shedding, which is presumably adapted to the climate prevailing in their habitat, and which has been shown by Yeates (1955) to be influenced by light in Shorthorns. There is reason to believe that the process of shedding can also be influenced by other things such as the nature of the food supply and the condition of the animal. Hamm...
متن کاملUsing Cattle to Reduce Oak Savanna Understory Shrub Abundance: Stocking Rates and Weight Gains
Oak (Quercus spp.) savanna, characterized by widely scattered oaks with an understory of prairie and other specialized species, is one of the most endangered native ecosystems in North America (Nuzzo 1986, Packard and MuteI1 997). The absence of grazing and burning along with the in troduction of tillage agriculture are key factors for the loss of this ecosystem. Our objective was to determine ...
متن کاملInterrelationships among shrub encroachment, land management, and litter decomposition in a semidesert grassland.
Encroachment of woody plants into grasslands, and subsequent brush management, are among the most prominent changes to occur in arid and semiarid systems over the past century. Despite the resulting widespread changes in landcover, substantial uncertainty about the biogeochemical impacts of woody proliferation and brush management exists. We explored the role of shrub encroachment and brush man...
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ژورنال
عنوان ژورنال: Journal of Range Management
سال: 1975
ISSN: 0022-409X
DOI: 10.2307/3897437