检索结果-南通市图书馆

维普期刊数据库博看期刊

Assessment of non-target toxicity effects of synthetic estradiol, quinestrol, in chickens

在线全文

学校读者我要写书评

暂无评论

Integrative Zoology 2022年第6期17卷 1053-1062页

作者： Siyuan HE Xunjun ZHOU Yong WANG meiwen zhang Kangjuan WU University of the Chinese Academy of Sciences BeijingChina Key Laboratory for Agro-Ecological Processes in Subtropical Regions Institute of Subtropical AgricultureChinese Academy of SciencesChangshaChina Dongting Lake Station for Wetland Ecosystem Research Institute of Subtropical AgricultureChangshaChina

Fertility control agents for the management of rodent populations are developing and *** the impacts on non-target species of consumption of these agents is *** present study assessed the non-target toxicity effects of quinestrol,a synthetic estrogen-based antifertility agent for managing rodent *** quinestrol doses administered to male and female(n=60 each)chickens through single oral gavage were 0(A),10(B),50(C),and 150(D)mg/kg body *** were assessed for effect on body weight,weight of vital and reproductive organs,reproductive hormones,histology of reproductive organs and egg laying rates after 15,30,and 135 days of *** did not induce mortality in chickens and its effects were time and dose *** 90%egg-laying rates were delayed by 30,60 for groups B and C compared with the control group,and group D did not reach the 90%egg-laying rate by 135 *** organs in males and females returned to normal levels within 30 and 135 days,*** the exception of the FSH concentration in group D,reproductive hormones of both sexes were similar to controls by 30 *** other signiﬁcant effects were *** present research demonstrated the safety of quinestrol on non-target species and facilitates recommendations for the general administration of quinestrol for rodent pest management.

关键词： anti-fertility agent chicken non-target effects quinestrol

Small mammal community succession on the beach of Dongting Lake,China after the Three Gorges Project

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Integrative Zoology 2014年第3期9卷 294-308页

作者： meiwen zhang Yong WANG Bo LI Cong GUO Guoxian HUANG Guo SHEN Xunjun ZHOU Dongting Lake Station for Wetland Ecosystem Research Key Laboratory of Agro-ecological Processes in the Subtropical RegionInstitute of Subtropical AgricultureChinese Academy of SciencesChangshaChina College of Life Science Sichuan UniversityChengduChina Research Center for Eco-environmental Sciences Chinese Academy of SciencesBeijingChina

Although the Three Gorges Project(TGP)may have affected the population structure and distribution of plant and animal communities,few studies have analyzed the effect of this project on small mammal ***,the present paper compares the small mammal communities inhabiting the beaches of Dongting Lake using field investigations spanning a 20-year period,both before and after the TGP was *** traps were used throughout the *** results indicate that the TGP caused major changes to the structure of the small mammal community at a lake downstream of the ***,species abundance on the beaches increased after the project *** striped field mouse(Apodemus agrarius)and the Norway rat(Rattus norvegicus),which rarely inhabited the beach before the TGP,became abundant(with marked population growth)once water was impounded by the Three Gorges ***,dominant species concentration indices exhibited a stepwise decline,indicating that the community structure changed from a single dominant species to a more diverse species mix after TGP ***,the regulation of water discharge release by the TGP might have caused an increase in the species diversity of the animal community on the beaches.A significant difference in diversity indices was obtained before and after the TGP *** indices also indicate a gradual increase in species ***,a long-term project should be established to monitor the population fluctuations of the Yangtze vole(Microtus fortis),the striped field mouse and the Norway rat to safeguard against population outbreaks(similar to the Yangtze vole outbreak in 2007),which could cause crop damage to adjacent farmland,in addition to documenting the succession process of the small mammal community inhabiting the beaches of Dongting Lake.

关键词： beach Dongting Lake small mammal community succession Three Gorges Project

Genetic variation and population dispersal of Yangtze voles Microtus fortis calamorum in the Dongting Lake region

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Current Zoology 2012年第2期58卷 211-220页

作者： Zongming GUO Pengfei SONG Cong GUO Zhaobin SONG Yong WANG Bo LI meiwen zhang Jianghong RAN College of Life Sciences Sichuan University Chengdu 610064 Sichuan China Key laboratory agro-ecological processes of Subtropical region Institute of Subtropical Agriculture Chinese Academy of Sciences Changsha 410125 China Yantai Nanshan University Yantai 265713 Shandong China

To understand genetic variation and population dispersal in the Yangtze vole Microtusfortis calamorum distributed in the Dongting Lake region, 144 individuals were collected from six habitat patches. The mitochondrial DNA control region was sequenced and 17 haplotypes were observed. Of the six investigated populations, haplotype and nucleotide diversities of those from larger patches were higher than those from smaller patches. Nonparametric correlation analysis showed that patch size had a positive correlation with haplotype diversity （r = 0.943, P 〈 0.01）. A neighbour-joining tree of the 17 haplotypes showed no geo- graphic genetic structure among the six populations. Analysis of isolation by distance showed that genetic differentiation among the six populations was not positively related to geographic distance. Analysis of mismatch distribution indicated that the voles had passed through a population expansion. The pattern of haplotype distribution in the Changsha population suggests that the population was established by a founder effect

关键词： Microtusfortis calamorum mitochondrial DNA control region genetic structure Dongting Lake Habitat patch

Evidence for the paternal mitochondrial DNA in the crucian carp-like fish lineage with hybrid origin

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2020年第1期63卷 102-115页

作者： Shi Wang Ni Jiao Lu Zhao meiwen zhang Pei Zhou Xuexue Huang Fangzhou Hu Conghui Yang Yuqin Shu Wuhui Li Chun zhang Min Tao Bo Chen Ming Ma Shaojun Liu State Key Laboratory of Developmental Biology of Freshwater Fish Hunan Normal UniversityChangsha 410081China College of Life Sciences Hunan Normal UniversityChangsha 410081China College of Chemistry and Chemical Engineering Hunan Normal UniversityChangsha 410081China Key Laboratory of Tropical and Subtropical Fisheries Resource Application and Cultivation Ministry of AgriculturePearl River Fisheries Research InstituteChinese Academy of Fishery SciencesGuangzhou 510380China

In terms of taxonomic status,common carp(Cyprinus carpio,Cyprininae)and crucian carp(Carassius auratus,Cyprininae)are different species;however,in this study,a newborn homodiploid crucian carp-like fish(2n=100)(2nNCRC)lineage(F1–F3)was established from the interspecific hybridization of female common carp(2n=100)×male blunt snout bream(Megalobrama amblycephala,Cultrinae,2n=48).The phenotypes and genotypes of 2 n NCRC differed from those of its parents but were closely related to those of the existing diploid crucian *** further sequenced the whole mitochondrial(mt)genomes of the 2n NCRC lineage from F1 to *** paternal mt DNA fragments were stably embedded in the mt-genomes of F1–F3 generations of 2n NCRC to form chimeric DNA *** with this chimeric process,numerous base sites of F1–F3 generations of 2 n NCRC underwent *** of these mutation sites were consistent with the existing diploid crucian ***,the mt DNA organization and nucleotide composition of 2n NCRC were more similar to those of the existing diploid crucian carp than those of the *** inheritable chimeric DNA fragments and mutant loci in the mt-genomes of different generations of 2nNCRC provided important evidence of the mt DNA change process in the newborn lineage derived from hybridization of different *** findings demonstrated for the first time that the paternal mt DNA were transmitted into the mt-genomes of homodiploid lineage,which provided new insights into the existence of paternal mt DNA in the mt DNA inheritance.

关键词： hybridization homodiploid common carp blunt snout bream crucian carp mitochondrial genome genetic evolution

Habitat evaluation for outbreak of Yangtze voles(Microtus fortis)and management implications

在线全文

学校读者我要写书评

暂无评论

Integrative Zoology 2015年第3期10卷 267-281页

作者： Zhenggang XU Yunlin ZHAO Bo LI meiwen zhang Guo SHEN Yong WANG Dongting Lake Station for Wetland Ecosystem Observation and Research Key Laboratory of Agro-ecological Process in Subtropical RegionInstitute of Subtropical AgricultureChinese Academy of SciencesChangshaChina Hu Nan City University YiyangChina

Rodent pests severely damage agricultural *** risk models of rodent pests often do not include sufficient information regarding geographic *** plays an important role in rodent-pest outbreak risk,and more information about the relationship between habitat and crop protection is urgently *** goal of the present study was to provide an outbreak risk map for the Dongting Lake region and to understand the relationship between rodent-pest outbreak variation and habitat *** main rodent pests in the Dongting Lake region are Yangtze voles(Microtus fortis).These pests cause massive damage in outbreak years,most notably in *** evaluation and ecological details were obtained by analyzing the correlation between habitat suitability and outbreak risk,as indicated by population density and historical *** the source-sink population,96.18%of Yangtze vole disaster regions were covered by a 10-km buffer zone of suitable habitat in *** outbreak frequency and peak population density were significantly correlated with the proportion of land covered by suitable habitat(r=0.68,P=0.04 and r=0.76,P=0.03,respectively).The Yangtze vole population tends to migrate approximately 10 km in outbreak ***,we propose a practical method for habitat evaluation that can be used to create integrated pest management plans for rodent pests when combined with basic information on the biology,ecology and behavior of the target species.

关键词： geographical information systems habitat evaluation remote sensing rodent pest management Yangtze vole

农垦地方化问题探讨——来自海南农垦管理体制改革的启示

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中南财经政法大学学报 2010年第5期 28-32页

作者：张美文中南财经政法大学工商管理学院湖北武汉430073

农垦的"块状分布"与"多重管理"造成地方的"支离破碎"与"区域失衡",理顺"条块分割"的管理格局,辨析相互间利益关系,以农垦地方化实现区域协调发展,将是"省部共建"型农垦未来发展的核心议题。农垦地方化是一项系统工程,需要在健全责任主... 详细信息

农垦的"块状分布"与"多重管理"造成地方的"支离破碎"与"区域失衡",理顺"条块分割"的管理格局,辨析相互间利益关系,以农垦地方化实现区域协调发展,将是"省部共建"型农垦未来发展的核心议题。农垦地方化是一项系统工程,需要在健全责任主体、构建协调模式、改变价值观念及重视运行保障等方面作出努力。

关键词：农垦地方化海南农垦转移支付现代企业制度

在线全文

学校读者我要写书评

暂无评论

密度制约效应对啮齿动物繁殖的影响

生态学报 2013年第19期33卷 5981-5989页

作者：韩群花郭聪张美文中国科学院亚热带农业生态研究所亚热带农业生态过程重点实验室洞庭湖湿地生态系统研究站长沙410125 四川大学生命科学学院成都610064

啮齿动物种群动态调节是生态学中关键的问题之一,它与制定鼠害防治策略密切相关。目前,国内外学者已在相关领域取得大量的研究成果。整理了密度制约效应对啮齿动物繁殖影响的文献,包括在性器官、性成熟、性周期、繁殖指数、激素和行为... 详细信息

啮齿动物种群动态调节是生态学中关键的问题之一,它与制定鼠害防治策略密切相关。目前,国内外学者已在相关领域取得大量的研究成果。整理了密度制约效应对啮齿动物繁殖影响的文献,包括在性器官、性成熟、性周期、繁殖指数、激素和行为的调节作用,同时分析该领域的研究途径及研究前景,旨在为今后的研究提供更多的思路。

关键词：密度制约啮齿动物繁殖

胰十二指肠切除术后早期胰瘘的影响及预测因素分析

在线全文

学校读者我要写书评

暂无评论

中国普通外科杂志 2018年第3期27卷 294-302页

作者：黄涛杨美文张雷达陆军军医大学附属西南医院肝胆外科重庆400038

目的:探讨胰十二指肠切除术(PD)后早期胰瘘的影响及预测因素,以指导术后更早拔除腹腔引流管,促进患者康复。方法:回顾西南医院肝胆外科2013年1月—2015年10月收治的430例PD手术患者的临床资料,用单因素与多因素统计法分析以及受试者操... 详细信息

目的:探讨胰十二指肠切除术(PD)后早期胰瘘的影响及预测因素,以指导术后更早拔除腹腔引流管,促进患者康复。方法:回顾西南医院肝胆外科2013年1月—2015年10月收治的430例PD手术患者的临床资料,用单因素与多因素统计法分析以及受试者操作特性曲线(ROC)分析术后早期胰瘘的影响因素及因素的预测价值。结果:430例患者中发生术后早期胰瘘116例(26.9%),此外,在未发生术后早期胰瘘的患者中,术后5d内拔除腹腔引流管患者术后胰瘘、腹腔感染以及总并发症发生率均明显低于5d后拔管患者(3.1%vs.12.1%、9.2%vs.20.3%、24.5%vs.42.0%,均P<0.05)。单因素及多因素Logistic回归分析显示,术后第1天腹腔引流液淀粉酶水平(DFA_1)与术后第1天血清淀粉酶水平(SA_1)为术后早期胰瘘的独立影响因素(OR=1.000、1.004,95%CI=1.000~1.001、1.001~1.006,均P<0.05);ROC分析结果显示,DFA_1预测PD术后早期胰瘘发生的曲线下面积(AUC)为0.916,明显大于SA_1(0.745),DFA_1≥494.75IU/L敏感度、特异度、阳性预测值、阴性预测值分别为91.7%、80.8%、62.7%、96.5%。结论:DFA1是PD后早期胰瘘重要的影响与预测因素,对于DFA_1<494.75IU/L的患者,可于术后第3天安全拔除腹腔引流管,并对患者实施快速康复策略。

关键词：胰十二指肠切除术胰腺瘘淀粉酶类因素分析统计学

在线全文

学校读者我要写书评

暂无评论

东方田鼠种群密度制约的迟滞效应

兽类学报 2018年第5期38卷 477-485页

作者：张宣张美文郭聪周训军王勇李波四川大学生命科学学院成都610064 中国科学院亚热带农业生态研究所亚热带农业生态过程重点实验室洞庭湖湿地生态系统研究站长沙410125

本研究中用成年东方田鼠不同时间不同密度笼养后(笼内雌雄各半),低密度配对饲养,观察各阶段东方田鼠繁殖指标的差异。试鼠144只,处理时分为LL(低密度长时间)(2只/笼,共20笼,90 d)、HL(高密度长时间)(8只/笼,共5笼,90 d)、HM(高密度中等... 详细信息

本研究中用成年东方田鼠不同时间不同密度笼养后(笼内雌雄各半),低密度配对饲养,观察各阶段东方田鼠繁殖指标的差异。试鼠144只,处理时分为LL(低密度长时间)(2只/笼,共20笼,90 d)、HL(高密度长时间)(8只/笼,共5笼,90 d)、HM(高密度中等时间)(8只/笼,共4笼,20 d)与HS(高密度短时间)(8只/笼,共4笼,10 d)4组。处理后在低密度条件下观察繁殖情况(胎仔数、怀孕率、分娩频率以及产仔间隔等),直至180 d。数据按时间划分为3个部分统计:0～90 d为第一阶段(不同密度处理期),90～109 d为过渡阶段(处理后的过渡期),109 d以后为第二阶段(正常低密度配对繁殖期)。结果表明:经过长时间高密度处理后,平均产仔数显著减少,组间平均分娩频率无显著差异。怀孕率由HL组到HM组,再到LL和HS组显著增加。在第一阶段,除LL组外,其余各组都未发现繁殖。过渡阶段的怀孕率组间差异显著,LL组以及HM组显著高于HL组。第二阶段的怀孕率以及胎仔数的组间差异显著,都为LL、HS两组较高,HL、HM两组较低。平均分娩频率、平均胎仔数以及产仔间隔各组间无显著差异。结论:不同持续时间的密度效应有较大差别。对于东方田鼠,20 d的高密度处理相比于10 d更能对其繁殖起到抑制作用。恢复低密度后,存在种群的迟滞性密度制约。

关键词：东方田鼠繁殖指标密度制约迟滞效应