Plans to mobilise vets call for national approach     

Dr Geoff Neumann 《Australian veterinary journal》2002,80(8):462-462

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Do birdwatchers buy the duck stamp?     

Nathan J. Shipley  Lincoln R. Larson  Caren B. Cooper  Kathy Dale  Geoff LeBaron  John Takekawa 《Human Dimensions of Wildlife》2019,24(1):61-70

Bird watchers (birders) are stakeholders in wildlife conservation; yet, few federal programs provide formal mechanisms for birders to contribute economically to conservation. One exception is the Migratory Bird Hunting and Conservation Stamp (duck stamp), a unique conservation tool historically aimed at waterfowl hunters that generates revenue to acquire and protect wetland habitat. This article examined duck stamp purchasing behavior among birders participating in the National Audubon Society’s annual citizen science project, the Christmas Bird Count (CBC) (n = 3,072). Twenty percent of CBC participants had purchased a duck stamp between 2013 and 2015, and about 40% of those purchasers were also hunters. Birding specialization was a key predictor of duck stamp purchasing behavior, with highly specialized nonhunting birders purchasing stamps at rates approximately equal to hunters. Future research should continue to explore reasons birders buy (or do not buy) duck stamps and the broader implications on wildlife conservation.  相似文献   

Effects of a nonsteroidal aromatase inhibitor on gonadal differentiation of bluegill sunfish Lepomis macrochirus     

Ze‐Xia Gao  Han‐Ping Wang  Geoff Wallat  Hong Yao  Dean Rapp  Paul O'Bryant  Russ MacDonald  Wei‐Min Wang 《Aquaculture Research》2010,41(9):1282-1289

In the present study, the efficacy of Letrozole, a potent nonsteroidal aromatase inhibitor (AI), on gonadal sex differentiation and sex reversal was examined in bluegill sunfish (Lepomis macrochirus). In Experiment 1, using AI diet treatments (50, 150, 250 and 500 mg kg⁻¹) from 30 to 90 days posthatch (dph), AI interrupted ovarian cavity formation at a dose of 500 mg kg¹ diet and one intersex fish was identified in this group. The proportions of males in all the treated groups were significantly higher than those in the control group. In Experiment 2, using AI immersion treatments (250, 500 and 1000 μg L⁻¹) during 30–50 dph, the treated groups of 500 and 1000 μg L⁻¹ produced significantly more males than the control and 250 μg L⁻¹ groups. Histological examination revealed no differences in ovary or testis tissue between control and AI‐treated fish. There were no significant differences detected in body weight and length among the AI treated and control groups (P>0.05) for both experiments. The results from these two experiments suggest that inhibition of aromatase activity by AI could influence sex differentiation in bluegill sunfish.  相似文献   

Assigning origins in a potentially mixed‐stock recreational sea trout ( Salmo trutta) fishery     

Geoff Veinott  Peter A. H. Westley  Lucas Warner  Craig F. Purchase 《Ecology of Freshwater Fish》2012,21(4):541-551

The anadromous, or sea‐going, life history form of brown trout, or sea trout ( Salmo trutta), may lead to potential mixing of populations while foraging at sea. In this article, we assess the potential that multiple populations are using common semi‐enclosed estuaries and quantify the potential levels of straying (i.e. dispersal) of foreign‐produced individuals into populations by using otolith chemical signatures as natural ‘tags’. To do so, we created a database of juvenile fish otolith chemistry (a marker of freshwater production) from four rivers and compared the chemistry of harvested fish in two estuaries important to anglers, the Renews River and Chance Cove Brook, to the database. A discriminant function analysis revealed significant differences in the otolith chemistry of juvenile fish inhabiting the four rivers with a 97% cross‐validated accuracy when classifying individual juveniles to their natal river, indicating our baseline was robust. When assigning adults caught over 3 years (2007–2009) in the recreational fishery in the Renews River estuary, it was determined that over 95% of the fish caught each year originated from Renews River. In contrast, harvested fish in Chance Cove during 2009 were disproportionately comprised of fish produced in Renews River, suggesting the potential for source‐sink population dynamics in Newfoundland. Taken as a whole, these results indicate limited population mixing in nearshore estuaries of this region, but also highlight the potential for some populations to subsidise the harvest by anglers in different areas.  相似文献   

Ethanol Addition for Enhancing Denitrification at the Uranium Mill Tailing Site in Monument Valley,AZ     

Borden  Andrew K.  Brusseau  Mark L.  Carroll  K. C.  McMillan  Andrew  Akyol  Nihat H.  Berkompas  Justin  Miao  Ziheng  Jordan  Fiona  Tick  Geoff  Waugh  W. Jody  Glenn  Ed P. 《Water, air, and soil pollution》2012,223(2):755-763

Water, Air, & Soil Pollution - Past mining and processing of uranium ore at a former uranium mining site near Monument Valley, AZ has resulted in nitrate contamination of groundwater. The...  相似文献   

Variation in microbial communities colonizing horticultural slow sand filter beds: implications for filter function     

Paul J. Hunter  Leo A. Calvo-Bado  Nick R. Parsons  Tim R. Pettitt  Geoff M. Petch  Eve Shaw  J. Alun W. Morgan  John M. Whipps 《Irrigation Science》2013,31(4):631-642

The effect of microbial colonization on the function and rejuvenation of slow sand filters was investigated using culture-independent profiling. Colonization resulted in significant reduction in filter pore size, which may be important in order to fully remove pathogens, but was not associated with a specific microbial component. Communities were highly variable, and no common microbial groups were found in effective filters. Bacterial community composition was affected by sand particle size, although high levels of microbial turnover during filter maturation suggested that this was unlikely to have a major influence on community composition. The composition of microbial inoculum from a previous filter could not be maintained through a cycle of culture, storage and re-culture. Furthermore, no significant proportion of the inoculum persisted in filter maturity, and no advantages in terms of time to filter maturation or final filter efficiency were evident. These results may explain why filtration is such an effective and robust water treatment and emphasize the need for further research on the mechanisms involved in pathogen elimination.  相似文献   

Adoption of Integrated Pest Management by apple growers: the role of context     

Geoff Kaine 《国际虫害防治杂志》2013,59(3):255-265

The adoption of pest and disease management practices has been the subject of numerous studies. Unfortunately, there is little consistency in their findings with regard to the variables that influence growers' decisions to adopt these techniques. In this study we focus on context as a means of explaining the lack of consistency. We used the results of in-depth interviews and a mail survey to explore context as a predictor of Australian apple growers' behaviour with respect to the management of codling moth and pest mites. We found that climate, topography, spatial separation between orchards and the crop mix determined the type and intensity of pest and disease pressures experienced by growers. Given the types and intensities of pest and disease pressures present, the management practices growers used depended on the range and effectiveness of the control options that were available to them. We concluded that variables representing specific aspects of orchard context were the primary determinants of the particular combinations of pest and disease management practices used by apple growers, not variables representing demographic and general enterprise characteristics that have been proposed in past studies.  相似文献   

紫花苜蓿不同品种对干旱胁迫的生理响应   总被引：40，自引：7，他引：33  

余玲  王彦荣  GARNETT Trevor  AURICHT Geoff  韩德梁 《草业学报》2006,15(3):75-85

以国内外20个优良紫花苜蓿品种为材料,研究了离体条件下叶片相对含水量、膜相对透性、游离脯氨酸和叶绿素含量等生理性状对干旱胁迫的响应,探讨了各种生理变化与抗旱性的关系,并结合草产量对其抗旱性进行了综合评价。结果表明,抗旱性强的品种在干旱胁迫下草产量高,叶片保水能力强,叶绿素持有率高,游离脯氨酸维持积累时间较长,维持积累量较高,能保持较高的细胞膜相对完整性。依据上述5项指标,通过系统聚类分析,将20个紫花苜蓿品种分为抗旱性强、较强、中等、较弱和弱5个等级。  相似文献   

'Kangaroo gait' in ewes     

Pritchard G  Scholes S  Millar M  Foster A 《The Veterinary record》2006,159(3):91-92

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Identification and expression profiles of nine glutathione S-transferase genes from the important rice phloem sap-sucker and virus vector Laodelphax striatellus (Fallén) (Hemiptera: Delphacidae)     

Zhou WW  Li XW  Quan YH  Cheng J  Zhang CX  Gurr G  Zhu ZR 《Pest management science》2012,68(9):1296-1305

BACKGROUND: Glutathione S‐transferases (GSTs) have received considerable attention in insects for their roles in insecticide resistance. Laodelphax striatellus (Fallén) is a serious rice pest. L. striatellus outbreaks occur frequently throughout eastern Asia. A key problem in controlling this pest is its rapid adaptation to numerous insecticides. In this research, nine cDNAs encoding GSTs in L. striatellus were cloned and characterised. RESULTS: The cloned GSTs of L. striatellus belonged to six cytosolic classes and a microsomal subgroup. Exposure to sublethal concentrations of each of the six insecticides, DDT, chlorpyrifos, fipronil, imidacloprid, buprofezin and beta‐cypermethrin, quickly induced (6 h) up‐expression of LsGSTe1. The expression of LsGSTs2 was increased by chlorpyrifos, fipronil and beta‐cypermethrin. Furthermore, exposure of L. striatellus to fipronil, imidacloprid, buprofezin and beta‐cypermethrin increased the expression of the LsGSTm gene after 24 or 48 h. CONCLUSION: This work is the first identification of GST genes from different GST groups in Auchenorrhyncha species and their induction characteristics with insecticide types and time. The elevated expression of GST genes induced by insecticides might be related to the enhanced tolerance of this insect to insecticides and xenobiotics. Copyright © 2012 Society of Chemical Industry  相似文献