Burbot harvest represented 5.1% of the fish-harvest in the tailwater of Gavins Point Dam in July 1956, one year after the dam was closed. Harvest increased from 510 in 1956 to 4,280 in 1958, but represented only 2% of the 1958 harvest. By 1961 burbot were no longer routinely caught in the tailwater, and their density decreased in the remainder of Nebraska's portion of the Missouri River. At pre...

Forests are under pressure from land use change due to anthropogenic activities. Land use change and harvest are the main disturbances of forest landscape changes. Few studies have focused on the relative contributions of different disturbances. In this study, we used the CA-Markov model, a land-use change model, coupled with a forest landscape model, LANDIS-II, to simulate dynamic change in Ta...

We analyze multi-period harvest problems for a renewable resource under biological uncertainty when harvesting is size-dependant. First, we show that the decision to harvest can be modeled as a real option and we derive analytical expressions for the value of the resource stock and the mean time between harvests, with and without uncertainty. We then illustrate numerically how uncertainty affec...

Meteorological elements directly influence crop potential productivity, regulating its transpiration, photosynthesis, and respiration processes in such a way as to control the growth and development of the plants throughout their physiological mechanisms at a given site. The interaction of the meteorological factors with crop responses is complex and has been the target of attention of many res...

The integration of local knowledge and science represents an opportunity to enhance the understanding of interrelations among climate, hydrology, and socioeconomic systems while providing mutual benefits to scientists and rural communities. Insight from rural Alaskans helped to identify a social-ecological threshold used to model potential driftwood harvest from the Yukon River. Information fro...

European red mites are the most frequent mite in Uzbekistan apple orchards, and they may be found from early spring through harvest. The orange-colored adults of twospotted spider overwinter beneath bark trees or on weeds. In spring, populations typically cluster tree nearby areas broadleaf weeds, brambles, sucker growth. Damage. Twospotted induce bronzing leaves. Spider leave a characteristic ...