Long-term feeding ecology and habitat use in harbour porpoises Phocoena phocoena from Scandinavian waters inferred from trace elements and stable isotopes     

Micha?l C Fontaine  Krystal A Tolley  Ursula Siebert  Sylvie Gobert  Gilles Lepoint  Jean-Marie Bouquegneau  Krishna Das 《BMC ecology》2007,7(1):1

Background  

We investigated the feeding ecology and habitat use of 32 harbour porpoises by-caught in 4 localities along the Scandinavian coast from the North Sea to the Barents Sea using time-integrative markers: stable isotopes (δ¹³C, δ¹⁵N) and trace elements (Zn, Cu, Fe, Se, total Hg and Cd), in relation to habitat characteristics (bathymetry) and geographic position (latitude).  相似文献   

Zn, Cu, Cd and Hg binding to metallothioneins in harbour porpoises Phocoena phocoena from the southern North Sea     

Krishna Das  Arnaud De Groof  Thierry Jauniaux  Jean-Marie Bouquegneau 《BMC ecology》2006,6(1):2-7

Background  

Harbour porpoises Phocoena phocoena from the southern North Sea are known to display high levels of Zn and Hg in their tissues linked to their nutritional status (emaciation). The question arises regarding a potential role of metallothioneins (MTs) with regard to these high metal levels. In the present study, metallothionein detection and associated Zn, Cd, Cu and Hg concentrations were investigated in the liver and kidney of 14 harbour porpoises collected along the Belgian coast.  相似文献   

Characterization and distribution of phytoplasma strains associated with temperate stone fruits and their possible natural reservoirs in the north-western Himalayan states of India     

Shreenath  Yapalahalli Sathyanarayanappa  Singh  Ashok Kumar  Kumar  Pasumarthi Venkata Dinesh  Watpade  Santosh  Singh  Krishna Pratap  Rao  Govind Pratap 《European journal of plant pathology / European Foundation for Plant Pathology》2022,162(1):93-104

European Journal of Plant Pathology - To understand the key soil factors that affect the survival and reproduction of Phytophthora sojae in soil, the number of zoospores and oospores of P. sojae...  相似文献   

Diverse RNA viruses in a parasitic flowering plant (spruce dwarf mistletoe) revealed through RNA-seq data mining     

Sidharthan  Venkidusamy Kavi  Chaturvedi  Krishna Kumar  Baranwal  Virendra Kumar 《Journal of General Plant Pathology》2022,88(2):138-144

Journal of General Plant Pathology - Spruce dwarf mistletoe (Arceuthobium sichuanense) is an important vascular parasite of spruce. In this study of the virome of A. sichuanense parasitizing Picea...  相似文献   

Molecular Docking of Laccase Protein from Bacillus Safensis DSKK5 Isolated from Earthworm gut: A Novel Method to Study dye Decolorization Potential     

Singh  Deepti  Sharma  Krishna Kant  Jacob  Shenu  Gakhar  S. K. 《Water, air, and soil pollution》2014,225(11):1-12

Water, Air, &; Soil Pollution - The bacterial communities in the intestinal tracts of earthworm were isolated by culture-dependent approaches. In total, 72 cultures were isolated and purified...  相似文献   

柠檬酸铜对肉鸡生产性能、血脂指标和组织胆固醇含量的影响     

陈常秀  秦四海 《西北农林科技大学学报(自然科学版)》2009,37(11):43-46

【目的】探讨柠檬酸铜对肉鸡生产性能、血脂指标和组织胆固醇含量的影响。【方法】采用单因子设计,将420只7日龄AA肉鸡随机分为7组,每组设3个重复,每个重复20只,公母各半。Ⅰ(对照)～Ⅶ组日粮分别添加0,50,100,150,200,250和300mg/kg柠檬酸铜,49日龄空腹称体质量,计算采食量、日增质量和料肉比。每组取6只鸡,采集血样、肝脏和胸腿肌,测定血清总胆固醇(TC)、甘油三酯(TG)、低密度脂蛋白(LDL-C)、极低密度脂蛋白(VLDL-C)和高密度脂蛋白(HDL-C)及肝脏、胸腿肌胆固醇含量。【结果】与Ⅰ组(对照)相比,Ⅳ～Ⅶ组肉鸡日增质量及日采食量均显著增加(P<0.05),料肉比显著降低(P<0.05);血清TC、TG、LDL-C、VLDL-C显著降低(P<0.05),HDL-C显著升高(P<0.05);胸腿肌、肝脏中的胆固醇含量显著降低(P<0.05);Ⅰ、Ⅱ、Ⅲ及Ⅳ、Ⅴ、Ⅵ、Ⅶ组间,以上指标差异均不显著(P>0.05)。【结论】日粮中添加150～300mg/kg柠檬酸铜,具有提高肉鸡生产性能、降低肉鸡血脂和组织胆固醇含量的效果。  相似文献   

The Embeddedness of Collective Action in Nepalese Community Forestry     

Krishna K. Shrestha  Phil McManus 《Small-Scale Forestry》2007,6(3):273-290

Collective action by local communities has been recognised as crucial for effective management of natural resources, particularly the management of forests in rural settings in developing countries. However, the processes and outcomes of collective action in forest management are often analysed through a narrow rational choice model, ignoring the impacts of wider social, political and economic processes in conditioning peoples’ decisions to act (or not to act) collectively. Optimistic assumptions are made for collective action being instrumental to enhance both social and ecological outcomes, but there is a paucity of empirical evidence on how and why the condition of forests has improved (or deteriorated) under collective action, and what impacts the change in forest condition has on various groups within local communities. This study critically examines the emergence, evolution and outcomes of collective action in a case of community forestry in Nepal. A mix of qualitative and quantitative methods has been used to collect primary data from the forest, households, key informants and focus groups. The emergence and outcomes of collective action is found to be embedded in social, economic and political relationships, where powerful actors control the use of forests in order to ensure conservation, thereby resulting in the underutilisation of forest products. Poor users, who depend heavily on forests, are found to be worse off economically under community forestry, but still engage in collective action for a variety of socio-political reasons. This contradicts the conventional wisdom which assumes that people only cooperate when they benefit from cooperation. It is concluded that a deeper understanding of the embeddedness of community forestry is needed in order to achieve the potential of collective action.

Krishna K. ShresthaEmail:

  相似文献   

Phylogenetic Analyses of Phytopathogenic Isolates of Verticillium spp     

Qin QM  Vallad GE  Wu BM  Subbarao KV 《Phytopathology》2006,96(6):582-592

ABSTRACT To better understand the genetic relationships between Verticillium dahliae isolates from lettuce and other phytopathogenic Verticillium spp. isolates from various hosts and geographic locations, the complete intergenic spacer (IGS) region of the nuclear ribosomal RNA gene (rDNA) and the beta-tubulin gene were amplified and sequenced. The sequences of the complete IGS region and the beta-tubulin gene were used alone and in combination to infer genetic relationships among different isolates of Verticillium with the maximum-likelihood distance method. Phylogenetic analyses set sequences into four distinct groups comprising isolates of V. albo-atrum, V. tricorpus, and V. dahliae from cruciferous and noncruciferous hosts. Within the four Verticillium groups, isolates of V. dahliae from cruciferous hosts displayed the closest affinity to V. dahliae from noncruciferous hosts. Isolates of V. dahliae from noncruciferous hosts could be further divided into four subgroups based on sequence similarities within the IGS region. Cross-pathogenicity tests demonstrated that most Verticillium isolates were as virulent on other hosts as on their hosts of origin. A phenogram based on the cross pathogenicity of individual isolates resembled those derived from the IGS and beta-tubulin sequence comparisons. On the basis of the data presented, the potential origin of some isolates of V. dahliae pathogenic on lettuce is proposed.  相似文献   

Adoption and Impact of Modern Rice Varieties on Poverty in Eastern India     

Kwasi Bannor Richard  Amarnath Krishna Kumar Gupta  Oppong-Kyeremeh Helena  Abawiera Wongnaa Camillus 《水稻科学》2020,27(1):56-66

The factors affecting the adoption of modern varieties(MVs) of rice and impact on poverty in Odisha, India were discussed. A total of 363 households from Cuttack and Sambalpur districts of Odisha via multistage sampling technique participated in the survey. The Cragg's Double hurdle model was used to model the determinants of adoption and intensity of adoption of MVs of rice, and the propensity score matching was used to analyze the impact of adoption on poverty. The results showed that age, education, risk aversion, land size, yield, perception of MVs as high yielding, resistant to diseases and availability of MVs positively influenced the decision to adopt. However, variables such as household size, experience of a farmer, off-farm job participation, amount of credit received, cost of seeds, insecticides and fertilizers negatively influenced the adoption of MVs. Intensity of adoption of MVs was negatively influenced by experience of a farmer, cost of fertilizer and marketability of MVs, and positively affected by household size, risk aversion, land size, cost of insecticides, perception of MVs as high yielding and availability of MV seeds. Poverty incidence, gap and severity were high among non-adopters to adopters of MVs. After matching adopters and non-adopters of MV groups using four different algorithms of nearest neighbour matching, stratification matching, radius matching and kernel matching, the impact of MV adoption resulted in higher per capita monthly household expenditure by about US$ 52.82 to US$ 63.17.  相似文献   

Community water management to intensify agricultural productivity in the polders of the coastal zone of Bangladesh     

Yadav  Sudhir  Mondal  Manoranjan K.  Shew  Aaron  Jagadish  S. V. Krishna  Khan  Zahirul Haque  Sutradhar  Asish  Bhandari  Humnath  Humphreys  Elizabeth  Bhattacharya  Jayanta  Parvin  Rokhsana  Rahman  Mahabubur  Chandna  Parvesh 《Paddy and Water Environment》2020,18(2):331-343

Paddy and Water Environment - Most of the lands of the southern coastal zone of Bangladesh are protected from tidal flooding and storm surges by embankments constructed during the 1960s and 1970s,...  相似文献