Exploring the Social Habitat for Hunting: Toward a Comprehensive Framework for Understanding Hunter Recruitment and Retention     

Lincoln R. Larson  Richard C. Stedman  Daniel J. Decker  William F. Siemer  Meghan S. Baumer 《Human Dimensions of Wildlife》2014,19(2):105-122

Decades of decline in the number of hunters in the United States have made hunter recruitment and retention (HRR) a high priority within the North American wildlife management community. Sociodemographic changes (e.g., urbanization, shifting racial/ethnic composition, parcelization of rural properties) suggest a need to re-examine conventional knowledge of HRR processes and develop insight that reflects contemporary contexts. In this article, we emphasize the “social habitat” for hunting and adopt a social–ecological model of hunting behavior to explore the myriad factors that interact to influence HRR at multiple scales. We examine the dynamic, hierarchical social structures that influence HRR, including forces that operate at the individual, micro (e.g., family), meso (e.g., community), and macro (e.g., society) levels. The review suggests that future research addressing HRR could expand to account for a broader, more diverse social habitat for hunting that includes these multiple scales.  相似文献   

Public Trust Philosophy for Fish and Wildlife Management: Implications for Human Dimensions     

T. Bruce Lauber  Daniel J. Decker  Emily F. Pomeranz 《Human Dimensions of Wildlife》2014,19(5):393-396

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中国稻瘟病菌的遗传多样性     

沈瑛  朱培良 《云南农业大学学报(自然科学版)》1993,8(3):203-204

 稻瘟病由Magnaporthe grisea,引起,是世界各水稻产区广泛分布的重要病害之一.实践证明,选用优良的抗病良种是稻瘟病综合防治的一项有效措施.然而一些抗病品种经推厂三五年后即渐趋感病,通常被认为是由于病菌生理小种迅速变化的结果.  相似文献   

Clinical evaluation of 51 dogs treated conservatively for disc-associated wobbler syndrome     

S. De Decker    S. F. M. Bhatti    L. Duchateau  V. A. Martlé    I. Van Soens    S. A. E. Van Meervenne    J. H. Saunders  †  L. M. L. Van Ham 《The Journal of small animal practice》2009,50(3):136-142

O bjectives : To evaluate the clinical evolution and potential risk factors of 51 dogs treated conservatively for disc-associated wobbler syndrome.
M ethods : Medical records of dogs treated conservatively for disc-associated wobbler syndrome were reviewed, and owners were contacted regarding clinical evolution and survival of their animals. Relationships between age, treatment before diagnosis, type of neurological signs, results of medical imaging and outcome were determined.
R esults : Fifty-one dogs underwent conservative treatment for disc-associated wobbler syndrome. A successful outcome was achieved in 45 per cent (23 of 51) of the patients. Median follow-up period was 18.5 months, and median survival time was 47 months. In 85 per cent of the dogs in which euthanasia was performed because of disc-associated wobbler syndrome, this was carried out in the first year after diagnosis. Outcome score was influenced by type of neurological signs and additional radiographic and/or myelographic abnormalities. Outcome score was not significantly associated with age, number of protruded intervertebral discs, occurrence, type and results of treatment before diagnosis.
C linical S ignificance : Conservative treatment of disc-associated wobbler syndrome is associated with a guarded prognosis. It can be considered in cases where all four limbs are not affected and no additional radiographic and/or myelographic abnormalities are detected.  相似文献   

Porcine β1,4-Galactosyltransferase-I Sequence and Expression     

EA Landers  HR Burkin  GT Bleck  L Howell-Skalla  DJ Miller 《Reproduction in domestic animals》2009,44(2):228-234

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Climate effects on size‐at‐age and growth rate of Chinook Salmon (Oncorhynchus tshawytscha) in the Fraser River,Canada     

Yi Xu  A. Scott Decker  Charles K. Parken  Lynda M. Ritchie  David A. Patterson  Caihong Fu 《Fisheries Oceanography》2020,29(5):381-395

Decline in size‐at‐age of Chinook Salmon (Oncorhynchus tshawytscha) has been observed for many populations across the entire Northeast Pacific Ocean, and identifying external drivers of this decline is important for sustainable management of these ecologically, economically, and culturally valuable resources. We assessed size‐at‐age of 96,939 Chinook Salmon sampled in the Fraser River watershed (Canada) from 1969 to 2017. A broad decline in size‐at‐age was confirmed across all population aggregates of Fraser River Chinook Salmon, in particular since year 2000. By developing a novel probability‐based approach to calculate age‐ and year‐specific growth rates for Fraser River Chinook Salmon and relating growth rates to environmental conditions in specific years through a machine learning method (boosted regression trees), we were able to disentangle multi‐year effects on size‐at‐age and thus identify environmental factors that were most related to the observed size‐at‐age of Chinook Salmon. Among 10 selected environmental variables, ocean salinity at Entrance Island in spring, the Aleutian Low Pressure Index and the North Pacific Current Bifurcation Index were consistently identified as important contributors for four of the seven age and population aggregate combinations. These top environmental contributors could be incorporated into future stock assessment and forecast models to improve Chinook Salmon fisheries management under climate change.  相似文献   

Ability of amino acids, dipeptides, polyamines, and sulfhydryls to quench hexanal, a saturated aldehydic lipid oxidation product.     

S Zhou  E A Decker 《Journal of agricultural and food chemistry》1999,47(5):1932-1936

Hexanal is a common product arising from the oxidation of omega-6 fatty acids. Because aldehydic lipid oxidation products can react with food components, interactions between hexanal and sulfhydryl- and amine-containing compounds were determined. The polyamines, spermidine and spermine, and the sulfhydryl-containing compounds, glutathione and thioctic acid, decreased headspace hexanal concentrations < or =7.0%. Histidine was the only amino acid tested that was able to quench headspace hexanal. Histidine-containing dipeptides decreased headspace hexanal 3.0-8.5-fold more than histidine. Hexanal quenching by the hisitidine-containing dipeptides increased as the size of the aliphatic side group of the amino acid adjacent to histidine increased, with Leu-His having the greatest hexanal quenching activity. The ability of Leu-His to quench histidine increased with increasing pH. The ability of histidine-containing dipeptides to interact with hexanal suggests that it may be possible to design peptides to alter the concentration of saturated aldehydes in oxidizing lipids.  相似文献   

Deep-Sea coral evidence for rapid change in ventilation of the deep north atlantic 15,400 years Ago   总被引：1，自引：0，他引：1  

JF Adkins  H Cheng  EA Boyle  ERM Druffel  RL Edwards 《Science (New York, N.Y.)》1998,280(5364):725-728

Coupled radiocarbon and thorium-230 dates from benthic coral species reveal that the ventilation rate of the North Atlantic upper deep water varied greatly during the last deglaciation. Radiocarbon ages in several corals of the same age, 15.41 +/- 0.17 thousand years, and nearly the same depth, 1800 meters, in the western North Atlantic Ocean increased by as much as 670 years during the 30- to 160-year life spans of the samples. Cadmium/calcium ratios in one coral imply that the nutrient content of these deep waters also increased. Our data show that the deep ocean changed on decadal-centennial time scales during rapid changes in the surface ocean and the atmosphere.  相似文献