The paper reviews existing allocation mechanisms in the five tuna regional fisheries management organizations and shows that although they have adopted different approaches all have failed to prevent overcapacity and, for some stocks, overexploitation. As an alternative, it is proposed that each tuna regional fishing management organization establish total allowable catches by species and area,...

Separate literatures exist to describe responses of timber owners and aggregate timber supply to product prices. While few investigators have alluded to the effects of varying inventory quality and ownership mix on the aggregate response, it is possible to describe how the responsiveness to prices can vary over time as the vintage of the timber inventory shifts. We estimated a probit harvest mo...

Exclusion cages were used to compare the incidence and severity of feeding injury from brown marmorated stink bug, Halyomorpha halys (Stål) (Hemiptera: Pentatomidae), on ‘Redhaven’ peaches, ‘Golden Delicious’ apples, and ‘Smoothee Golden’ apples at harvest, following sequential periods of exposure to natural H. halys populations during the 2011 and 2012 growing seasons in Virginia. The fruit us...

There IS increasing concern about the effects of nutrient removal associated with various forest harvesting practices on long-term sate productivity. We measured exchangeable soil cation concentration responses to a commercial clearcut sawlog harvest in mixed hardwoods on a 59.ha watershed in the southern Appalachians. Soils were sampled 17 months prior to, and periodically for I7 years after, ...

Spatially-explicit harvest scheduling models optimize the spatiotemporal layout of forest management actions to best meet management objectives such as profit maximization, even flow of products, or wildlife habitat preservation while satisfying a variety of constraints. This investigation focuses on modeling maximum harvest opening size restrictions whose role is to limit the size of contiguou...

The coordination of the timing of flowering with seasonal and development cues is a critical life-history trait that has been shaped by evolution to maximize reproductive success. Decades of studying many plant species have revealed several of the fascinating systems that plants have evolved to control flowering time: such as the perception of day length in leaves, which leads to the production...

Continuous time models of single exploited populations usually generate outcomes expressing a dependence of yield and economic items on harvest intensity. In this work it is shown that a known threshold policy is able to generate yield and related economic items that do not depend on harvest intensity, but rather on the values of the population threshold itself and the species intrinsic paramet...

In Europe, the perennial C4 grass miscanthus is currently mainly cultivated for energy generation via combustion. In recent years, anaerobic digestion has been identified as a promising alternative utilization pathway. Anaerobic digestion produces a higher-value intermediate (biogas), which can be upgraded to biomethane, stored in the existing natural gas infrastructure and further utilized as ...

Spatially-explicit harvest scheduling models optimize the spatial and temporal layout of forest management actions in order to best meet management objectives such as profit maximization, even flow of products, or wildlife habitat preservation while satisfying a variety of constraints, including maximum harvest opening size constraints. A procedure is proposed that strengthens these arearestric...