نتایج جستجو برای: harvest management

تعداد نتایج: 871504  

2007
JOHN LEE

We analyzed the age, sex, and chronology of the polar bear (Ursus maritimus) harvest in the Northwest Territories (NWT) from 197980 to 1989-90. The mean annual harvest during that period was 517 with a current quota of 617. Sex and age information was obtained on approximately 90 % of the total kill. The harvest was selective for males (63 %). The mean age, sex ratio, and age composition varied...

2006
Robert I. McDonald Glenn Motzkin Michael S. Bank David B. Kittredge John Burk David R. Foster

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...

2017
Jun-Feng Shi Chang-Qing Sun

Tomato is one of the most important vegetables in the world. Decay after harvest is a major issue in the development of tomato industry. Currently, the most effective method for controlling decay after harvest is storage of tomato at low temperature combined with usage of chemical bactericide; however, long-term usage of chemical bactericide not only causes pathogen resistance but also is harmf...

2013
Katie Kerwin

EDITOR’S NOTE: This is the first in a four-part series of articles dealing with the Church’s ministry to the elderly. This article will attempt to give a brief profile of the problems faced by the aging. Succeeding articles will treat tradi­ tional Church responses to the needs of the elderly and look at some new approaches to the situa­ tion and new directions of action, including South Bend H...

2017
Zhuo Wu Quansheng Ge Erfu Dai Audrey L. Mayer

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...

2013
Satoshi Yamazaki Sarah Jennings Quentin Grafton Tom Kompas

The depletion of important fish stocks and the degradation of marine ecosystems are common problems worldwide. Two approaches that have been widely used to restore depleted fish stocks are the implementation of harvest control rules and the establishment of marine reserve networks. Harvest control rules, underpinned by the monitoring and assessment of the status of target stocks, provide a scie...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2009
Fred W Allendorf Jeffrey J Hard

Human harvest of phenotypically desirable animals from wild populations imposes selection that can reduce the frequencies of those desirable phenotypes. Hunting and fishing contrast with agricultural and aquacultural practices in which the most desirable animals are typically bred with the specific goal of increasing the frequency of desirable phenotypes. We consider the potential effects of ha...

2014
Scott E. Hygnstrom Stephen M. Vantassel Timothy R. Van Deelen David Drake

Dramatic growth in numbers of white-tailed deer (Odocoileus virginianus) and declines in hunter recruitment have challenged our ability to manage deer populations through traditional methods. We surveyed all state wildlife agencies and estimate the current abundance of white-tailed deer in North America exceeds 30 million. States currently are issuing record numbers of permits to hunters to inc...

2017
Gillian Murray-Dickson Muhammad Ghazali Rob Ogden Rafe Brown Mark Auliya

As an important economic natural resource in Southeast Asia, reticulated pythons (Malayopython reticulatus ssp.) are primarily harvested from the wild for their skins-which are prized in the luxury leather goods industry. Trade dynamics of this CITES Appendix II listed species are complex and management approaches on the country or regional level appear obscure. Little is known about the actual...

2017
Luis F. Aristizábal Melissa Johnson Suzanne Shriner Robert Hollingsworth Nicholas C. Manoukis Roxana Myers Paul Bayman Steven P. Arthurs

The coffee berry borer (CBB), Hypothenemus hampei, is the most significant insect pest of coffee worldwide. Since CBB was detected in Puerto Rico in 2007 and Hawaii in 2010, coffee growers from these islands are facing increased costs, reduced coffee quality, and increased pest management challenges. Here, we outline the CBB situation, and summarize the findings of growers, researchers, and ext...

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