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Effects of Different Substrates on Growth and Survival of Labeo victorianus (Pisces: Cyprinidae, Boulenger 1901) Fry towards Its Conservation along the Mara Basin

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Open Journal of Ecology 2023年第1期13卷 37-48页

作者： Paul Sagwe Orina Lucy Wangari Ikanya Robin Abell Leonard Akwany mercy chepkirui Rasowo Joseph Kenya Marine & Fisheries Research Institute (KMFRI) Kegati Aquaculture Centre Kisii Kenya Faculty of Agriculture Department of Animal Sciences Jomo Kenyatta University of Agriculture and Technology Nairobi Kenya Conservation International 2011 Crystal Drive Arlington USA Technical University of Mombasa Mombasa Kenya

The study evaluated the role of different substrates on water quality, growth and survival of Labeo victorianus fry. Random sampling was used to select 225 fry, stocked at 100/m3 and fed on shell free artemia® (40% - 60% crude protein). Each treatment was carried out in triplicates using gravel and sand as substrates and water media without substrate (control). Growth and survival of the fry was monitored over 4 weeks period at a hatchery set-up. Physicochemical parameters were measured weekly while mortality was documented daily. Substrate type had an effect on water quality, growth and survival of fry. Dissolved Oxygen, growth and survival was higher in tanks under gravel substrate than sand and control while mortality was higher (22%) for sand (p ≤ 0.05) than gravel and sand treatments. Fry in gravel substrate had the best growth response (1.77 ± 0.92 g) while control and sand recorded 1.57 ± 0.90 g and 1.45 ± 0.97 g respectively. In contrast, growth was homogenous during the first 2 weeks of the trial but gravel substrate fry significantly out-grew sand and control in the remaining 3 weeks. However, fry in sand and control experienced compensatory growth towards the end of the study. Therefore, gravel substrate enhances L. victorianus performance and is recommended in the introduction of the species into aquaculture and re-stocking back to the wild.

关键词： Aquaculture Water Quality Fry Treatment

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Floristic Composition, Population Structure, and Recruitment Status of Plant Species: A Case Study of Farmer-Managed Natural Regeneration Practices in Arid and Semi-Arid Lands in Kenya

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Open Journal of Forestry 2024年第2期14卷 141-154页

作者： Simon Kosgei Choge Samson Okoth Ojunga Dub Isacko Dokata William Kimen chepkirui Justus Musau Faith Milkah Muniale Ivan Kiplagat Kiptui Kenya Forestry Research Institute-Rift Valley Eco-Region Research Program Marigat Kenya Kenya Forestry Research Institute-Lake Victoria Eco-Region Research Program Kisumu Kenya Kenya Forestry Research Institute-Rift Valley Eco-Region Research Program Londiani Kenya CRIFSUP Project World Vision Kenya Nairobi Kenya

The technique of Farmer Managed Natural Regeneration (FMNR) is being promoted as a cost-effective approach for restoring degraded arable dry lands. Its effectiveness has been observed in many countries across the globe, where it is a traditional practice, and is now being encouraged across the African continent. This study aimed to evaluate the impact of FMNR on floristic Composition, Vegetation Structure, and Regeneration Status of woody Plant Species in the severely degraded Central Rift, Kenya. The study systematically assessed how FMNR influenced species composition, vegetation structure and regeneration status from two sample plots involved in FMNR practices. Transect lines and quadrats methods were utilized to collect data, specifically regarding the floristic composition, vegetation structure, and regeneration status of woody plant species. Quadrats and sub-quadrats of varying sizes (10 m by 10 m, 5 m by 5 m, and 1 m by 1 m) were nested along the transect lines for data collection. Furthermore, measurements of tree growth and development, including root collar diameter, diameter at breast height (D130) and heights within the study blocks, were taken. The data was then analyzed using R-software. Results showed a marked progressive increase in numbers of trees, saplings, seedlings, shrubs and herbs in all FMNR sites and reductions in all non-FMNR sites. The study advocates for widespread promotion of the FMNR practice both as an environmental conservation and restoration strategy.

关键词： Farmer Managed Natural Regeneration FMNR Floristic Composition Vegetation Structure Regeneration Biodiversity

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Evaluation on Gender Difference in Academic Performance in African Public Universities: a Case Study of Arts and Science Undergraduates from Egerton, Kabianga, Chuka and Laikipia Universities

Evaluation on Gender Difference in Academic Performance in A...

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作者： chepkirui JOYCE 南京农业大学

学位级别：硕士

教育被认为是任何国家成功的关键因素;它有助于人力资本的发展,从而刺激了经济发展,并增加了改善生活的机会。然而,在肯尼亚的中小学中,学生的表现存在性别差异。本项研究以Tinto的学生减员和目标理论模型为指导,采用定量研究设计,在使... 详细信息

教育被认为是任何国家成功的关键因素;它有助于人力资本的发展,从而刺激了经济发展,并增加了改善生活的机会。然而,在肯尼亚的中小学中,学生的表现存在性别差异。本项研究以Tinto的学生减员和目标理论模型为指导,采用定量研究设计,在使用人口统计学因素、教育背景、课堂行为、学生态度、自我概念、学生的动机因素和课外活动等独立因素的基础上,研究学生第一年至本年度的平均绩点(GPA)的表现,目的是促进肯尼亚公立大学高等教育中的性别包容性。本研究采用问卷调查法,从四所大学(埃格顿、卡比安加、楚卡和莱基皮亚)的艺术专业和自然科学专业第三学年和最后学年的本科生中分别随机抽取100名学生,共400个样本。在经过数据清洗及整理后,利用SPSS26考察问卷的信效度,得到问卷的Cronbach Alpha系数为0.817,具有良好的信效度。接下来使用描述性统计(频率分布,均值和百分比)和推论统计(独立T检验,相关性,简单回归分析)来对数据进行分析。研究发现,本科生在课堂行为和学生的自我概念中存在性别差异(P<0.05),女性得分较高;课堂行为(r=0.155,p<0.01),学生态度(r=0.125,p<0.05),学生动机因素(r=0.333,p<0.01)和教育背景(r=0.108,P<0.05)对大学生的学业成绩的显著正向影响。同时通过回归分析进一步确定了课堂行为(β=0.133,P<0.01),动机因素(β=0.194,P<0.001)和先前的教育背景(β=0.046,P<0.05)对学习成绩的显著影响。在上述研究的基础上,本研究建议大学强调学生的课堂行为和自我概念,因为它们与学生表现上的性别差异有关。大学还应强调与学习成绩相关的所有五个相关因素,这些因素对学生在这项研究中的表现产生积极影响。

关键词： motivation,undergraduate,attitude,动机因素,课堂行为,性别差异,自我概念,university,educational,学习成绩,

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Talk in the Second and Foreign Language Classroom: A Review of the Literature

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当代外语研究 2013年第12期 82-93页

作者： CATHERINE DIFELICE BOX SARAH chepkirui CREIDER HANSUN ZHANG WARING Teachers College Columbia University

Classroom interaction has long been a rich site for scholarly research,as attested by the sizable body of literature surrounding classroom *** paper reviews three frameworks currently informing studies of L2and FL classroom talk,with a focus on qualitative analyses of turn-by-turn talk between teachers and students,and amongst students *** from studies working within(1)language socialization and sociocultural theory,(2)critical discourse analysis,and(3)conversation analysis are explored,along with the ways in which these frameworks complement and complicate one ***,we briefly consider possible areas of further research and implications for teacher training.

关键词：英语学习学习方法阅读知识阅读材料

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The amazing potential of fungi:50 ways we can exploit fungi industrially

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Fungal Diversity 2019年第4期97卷 1-136页

作者： Kevin D.Hyde Jianchu Xu Sylvie Rapior Rajesh Jeewon Saisamorn Lumyong Allen Grace T.Niego Pranami D.Abeywickrama Janith V.S.Aluthmuhandiram Rashika S.Brahamanage Siraprapa Brooks Amornrat Chaiyasen K.W.Thilini Chethana Putarak Chomnunti Clara chepkirui Boontiya Chuankid Nimali I.de Silva Mingkwan Doilom Craig Faulds Eleni Gentekaki Venkat Gopalan Pattana Kakumyan Dulanjalee Harishchandra Hridya Hemachandran Sinang Hongsanan Anuruddha Karunarathna Samantha C.Karunarathna Sehroon Khan Jaturong Kumla Ruvishika S.Jayawardena Jian-Kui Liu Ningguo Liu Thatsanee Luangharn Allan Patrick G.Macabeo Diana S.Marasinghe Dan Meeks Peter E.Mortimer Peter Mueller Sadia Nadir Karaba N.Nataraja Sureeporn Nontachaiyapoom Meghan O’Brien Watsana Penkhrue Chayanard Phukhamsakda Uma Shaanker Ramanan Achala R.Rathnayaka Resurreccion B.Sadaba Birthe Sandargo Binu C.Samarakoon Danushka S.Tennakoon Ramamoorthy Siva Wasan Sriprom T.S.Suryanarayanan Kanaporn Sujarit Nakarin Suwannarach Thitipone Suwunwong Benjarong Thongbai Naritsada Thongklang Deping Wei S.Nuwanthika Wijesinghe Jake Winiski Jiye Yan Erandi Yasanthika Marc Stadler Key Laboratory for Plant Diversity and Biogeography of East Asia Kunming Institute of BotanyChinese Academy of ScienceKunming 650201YunnanPeople’s Republic of China Center of Excellence in Fungal Research Mae Fah Luang UniversityChiang Rai 57100Thailand School of Science Mae Fah Luang UniversityChiang Rai 57100Thailand World Agroforestry Centre East and Central AsiaKunming 650201YunnanPeople’s Republic of China Mushroom Research Foundation 128 M.3 Ban Pa Deng T.PaPaeA.Mae TaengChiang Mai 50150Thailand Aix Marseille Université INRAUMR1163 BBF13288 Marseille Cedex 09France Beijing Key Laboratory of Environment Friendly Management on Fruit Diseases and Pests in North China Center of Plant and Environment ProtectionBeijing Academy of Agriculture and Forestry SciencesBeijing 100097People’s Republic of China Center of Chemical Innovation for Sustainability Mae Fah Luang UniversityTasudMuangChiang Rai 57100Thailand Center of Excellence in Microbial Diversity and Sustainable Utilization Faculty of ScienceChiang Mai UniversityChiang Mai 50200Thailand Center for Mountain Ecosystem Studies Kunming Institute of BotanyChinese Academy of SciencesKunming 650201YunnanPeople’s Republic of China Institute of Fungal Research School of Life Science and TechnologyUniversity of Electronic Science and Technology of ChinaChengdu 611731People’s Republic of China Department Microbial Drugs Helmholtz Centre for Infection Researchand German Centre for Infection Research(DZIF)partner site Hannover-BraunschweigInhoffenstrasse 738124 BrunswickGermany Department of Biology Faculty of ScienceChiang Mai UniversityChiang Mai 50200Thailand Department of Chemistry and Biochemistry The Ohio State UniversityColumbusOH 43210USA Department of Chemistry University of Science and TechnologyBannuKhyber PakhtunkhwaPakistan Department of Crop Physiology University of Agricultural SciencesGKVKBengaluruKarnataka 560065India Department of Entomology and Plant Pathology Faculty of AgricultureChiang Mai Univers

Fungi are an understudied,biotechnologically valuable group of *** to the immense range of habitats that fungi inhabit,and the consequent need to compete against a diverse array of other fungi,bacteria,and animals,fungi have developed numerous survival *** unique attributes of fungi thus herald great promise for their application in biotechnology and ***,fungi can be grown with relative ease,making production at scale *** search for fungal biodiversity,and the construction of a living fungi collection,both have incredible economic potential in locating organisms with novel industrial uses that will lead to novel *** manuscript reviews fifty ways in which fungi can potentially be utilized as *** provide notes and examples for each potential exploitation and give examples from our own work and the work of other notable *** also provide a flow chart that can be used to convince funding bodies of the importance of fungi for biotechnological research and as potential *** have provided the world with penicillin,lovastatin,and other globally significant medicines,and they remain an untapped resource with enormous industrial potential.

关键词： Biocontrol Biodiversity Biotechnology Food Fungi Mushrooms

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