The effects of collection date and pre-storage treatment on the germination of blue oak acorns     

Doug McCreary  Zoi Koukoura 《New Forests》1989,3(4):303-310

Concern about poor natural regeneration of blue oak in California has prompted efforts to artificially regenerate this species. Two studies examined the best time to collect acorns and the effect various pre-storage treatments, including soaking and drying, have on germination. Results indicated that acorns can be successfully collected over a fairly wide interval, extending from late August until late October. Acorns from all harvest dates had high germination, as long as they were not allowed to dry out before storage. However, the earlier the acorns were collected, the earlier they tended to germinate. Soaking acorns for a day prior to storage had little effect. Drying acorns, however, reduced both the rate and amount of germination. A 10% reduction in moisture content resulted in almost 40% less total germination, and all acorns that lost 25% or more of their mositure failed to germinate during the 10-week test interval. To ensure good seed quality, blue oak acorns should be collected directly from tree branches and placed immediately in cold storage.  相似文献   

Stocking Density Affects Diet Selection     

Doug Peterson  Mark Brownlee  Tim Kelley 《Herpetological Monographs》2013,35(5):62-66

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Color atlas of veterinary anatomy          下载免费PDF全文

Doug Leach 《The Canadian veterinary journal. La revue veterinaire canadienne》1988,29(12):1023-1024

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Volunteering for your profession??     

Roberts D 《The Canadian veterinary journal. La revue veterinaire canadienne》2011,52(7):697-698

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Year of the Cat! Vet2011! 125th Anniversary of FMV!     

Roberts D 《The Canadian veterinary journal. La revue veterinaire canadienne》2011,52(3):223-224

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The molecular epidemiology of Cryptosporidium and Giardia infections in coyotes from Alberta,Canada, and observations on some cohabiting parasites     

R.C. Andrew Thompson  Doug D. Colwell  Todd Shury  Amber J. Appelbee  Carolyn Read  Zablon Njiru  Merle E. Olson 《Veterinary parasitology》2009

Coyotes from southern Alberta and Saskatchewan, Canada, were examined for the presence of Giardia and Cryptosporidium and cohabiting helminths. Toxascaris was present in over 90% of the 70 animals examined, and Taenia sp. in 6.5–25% of the two groups of animals studied. Giardia (12.5–21.7%) and Cryptosporidium (0–17.4%) were also common and molecular characterisation revealed both zoonotic and host-adapted genotypes of Giardia, whereas the Cryptosporidium proved to be a variant of the canine species C. canis. The seasonal variation observed in the occurrence of Cryptosporidium may be related to stress-induced shedding of the parasite.  相似文献   

Identifying the challenges of promoting ecological weed management (EWM) in organic agroecosystems through the lens of behavioral decision making     

Sarah Zwickle  Robyn Wilson  Doug Doohan 《Agriculture and Human Values》2014,31(3):355-370

Ecological weed management (EWM) is a scientifically established management approach that uses ecological patterns to reduce weed seedbanks. Such an approach can save organic farmers time and labor costs and reduce the need for repeated cultivation practices that may pose risks to soil and water quality. However, adoption of effective EWM in the organic farm community is perceived to be poor. In addition, communication and collaboration between the scientific community, extension services, and the organic farming community in the US is historically weak. In order to uncover the most persistent obstacles to promoting effective weed management in organic agroecosystems, we use the mental models approach to generate an expert model based on interviews with experts (e.g., weed scientists, weed ecologists, and extension personnel) and theories from the behavioral sciences. The expert model provides two main insights: (1) EWM is a complex strategy that may cause farmers to use heuristics in management decisions and (2) the long-term benefits of EWM, rather than the risks, need to be emphasized in communication with and outreach to organic farmers. The basis for new research topics and outreach material that incorporates these insights from the expert model are discussed. We briefly explain how the expert model is an incomplete picture of on-farm practices, but provides the basis for the second step of our mental models research, the farmer interviews and farmer decision model development.  相似文献   

Advances in equine immunology: Havemeyer workshop reports from Santa Fe,New Mexico,and Hortobagy,Hungary     

Marti E  Horohov DW  Antzak DF  Lazary S  Paul Lunn D 《Veterinary immunology and immunopathology》2003,91(3-4):233-243

The horse has been human kind's most important partner throughout history. Similarly, in the field of immunology, many critical scientific advances have depended on the horse. Equine immunology today is an active and important field of study, with a focus on control of many common infectious diseases and immunopathologic conditions of broad comparative interest. In 2001 two major equine immunology workshops were held, in Santa Fe, USA, and in Hortobagy, Hungary, with major sponsorship from the Havemeyer Foundation. This report summarizes the scientific themes and foci of those meetings.  相似文献   

The need to look outward          下载免费PDF全文

Hare D 《The Canadian veterinary journal. La revue veterinaire canadienne》2003,44(6):447-448

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I swear that ..     

Hare D 《The Canadian veterinary journal. La revue veterinaire canadienne》2004,45(2):93-94

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