نتایج جستجو برای: harvest function
تعداد نتایج: 1234939 فیلتر نتایج به سال:
BACKGROUND The purpose of this study was to evaluate long-term functional donor site morbidity following ulnar forearm flap harvest taking both subjective and objective criteria into consideration. METHODS In this retrospective analysis, 61 patients were evaluated for subjective and objective donor site morbidity 3 to 164 months after flap harvest, and the Disabilities of Arm, Shoulder, and H...
With growing concerns about the impact of selective harvesting on natural populations, researchers encourage managers to implement harvest regimes that avoid or minimize the potential for demographic and evolutionary side effects. A seemingly intuitive recommendation is to implement harvest regimes that mimic natural mortality patterns. Using stochastic simulations based on a model of risk as a...
Abstract. In the present study, we consider a nutrient-autotroph-herbivore ecosystem model where the herbivore species is assumed to have a commercial value. We use a Holling type-II harvest function to model density dependent herbivore harvesting. Stability criteria of the resulting model is investigated both from analytical and numerical viewpoints. The investigation revealed the existence of...
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...
Body size is a key parameter influencing demographic characteristics of fish populations as well as market value of landed catch. Yet in bioeconomic modelling body size is often an overlooked biological and economic parameter. Here we evaluate how sizedependent pricing influences optimal harvest strategies in a model parameterized for two pelagic fisheries, those targeting Atlantic herring (Clu...
BACKGROUND The aim of life-support measures in brain-dead donors is to preserve the functional value of their organs. In renal transplantation, serum creatinine level is one of the criteria for graft harvest. The aim of this study was to assess the impact of intensive care on donor renal function through two criteria: preharvesting serum creatinine level above 120 micromol/L and the elevation o...
Forest harvesting is an important, ongoing disturbance that affects the composition, structure, and ecological function of the majority of the world’s forests. However, few studies have examined the interaction between land-use conversion and harvesting. We utilize a unique, spatially explicit database of all cutting events (n > 13,000) and land-cover conversions for Massachusetts over the past...
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