Results 41 to 50 of about 17,401 (196)
Differences in characteristics between naturalized threatened plants and other threatened plants
Abstract Many non‐native plant species introduced by humans have become naturalized. At the same time many species are threatened in their native range. However, the number of plant species threatened in their native range that are naturalized elsewhere remains unknown.
Weihan Zhao +10 more
wiley +1 more source
Classification and phylogeographical analyses of Siphonaria and Cellana limpets in China and Southeast [PDF]
探究岩相潮间带生物的多样性以及分布格局的形成机制不仅有助于我们了解不同时空尺度下历史和当代环境因素的作用结果,而且为全球变化和人类活动背景下预报未来生物群落的动态变化提供了理论依据。快速发展的生物地理学和系统地理学的理论知识和分析方法已成为探究生物多样性的有效工具。本研究在此背景下对广泛分布于中国及东南亚岩相潮间带腹足纲中的帽贝属(Cellana)和菊花螺属(Siphonaria)进行了生物地理学和系统地理学分析,揭示了这两个属的贝类在东南亚沿岸的分布,并讨论了历史和当代因素在塑造嫁虫戚(C ...
王杰
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Representation of obligate groundwater‐dwelling copepod diversity in European protected areas
Abstract Groundwaters sustain diverse surface ecosystems and are populated by metazoan species, mostly invertebrates, that provide fundamental ecological functions and are often of prominent conservation value due to narrow endemism and high phylogenetic rarity.
Francesco Cerasoli +7 more
wiley +1 more source
为有效保护浙江长兴尹家边扬子鳄保护区扬子鳄(Alligator sinensis)种群,丰富野放扬子鳄的遗传多样性,利用13个微卫星标记分析了该种群的遗传多样性,比较核心区和野放区种群的遗传多样性差异。结果显示:保护区扬子鳄种群共检测到31个等位基因,其中含2个稀有等位基因。野放区种群的平均有效等位基因数量(1.82)、平均观测杂合度(0.49)、平均期望杂合度(0.43)、平均多态信息含量(0.34)和平均香农信息指数(0.64)均低于核心区(1.89、0.52、0.46、0.37和0.70 ...
方黎明 +8 more
doaj
Genetic diversity of Noctiluca scintillans [PDF]
夜光藻是一种常见的赤潮藻,在世界大部分近海海域均有分布。目前普遍认为夜光藻只有一个种,但还没有研究探索不同地理种群的夜光藻是否产生了种内变异。本研究通过单细胞PCR以及单细胞克隆文库的方法,比较了中国黄海、东海、南海,墨西哥湾以及阿拉伯海5个海域夜光藻核糖体基因的遗传多样性。主要研究结果如下: 1、发现22种ITS单倍型(n=103),12种28S单倍型(n=25),6种18S单倍型(n=31);这3个基因的单倍型多样度(Hd)分别为0.824、0.670、0.557,核苷酸多样度(π)分别为0 ...
潘永柏
core
Effects of political identity activation and inaccurate metaperceptions on attitudes toward wolves
Abstract Polarization between groups can undermine durable conservation outcomes. Activating group identities (i.e., an individual's sense of self derived from membership in a group) can exacerbate differences, especially when people hold inaccurate perceptions of their peers and rivals.
Alexander L. Metcalf, Justin W. Angle
wiley +1 more source
以窝卵数、卵大小(长径和短径)、卵重量和窝卵重为指标,对7个北草蜥地理种群的繁殖特征进行聚类分析.结果表明:不同地理分布的北草蜥种群的繁殖特征可明显分为福建宁德、浙江洞头岛和浙江丽水类群,浙江北麂岛、安徽滁洲、浙江东阳和浙江杭州类群.其中,浙江北麂岛种群与安徽滁洲种群的繁殖特征尤为相似.
DUWei-guo(杜卫国) +2 more
doaj +1 more source
Mating system, brood parasitism and extra-pair behaviour in the Chinese egret (Egretta eulophotes) basing on the microsatellite technology [PDF]
动物的婚配制度影响着个体的繁殖成功率,直接关系到群体的遗传多样性和种群动态的发展变化,是保护遗传学和生态学领域中非常重要的研究内容。已有学者野外观察到黄嘴白鹭(Egrettaeulophotes)存在婚外交配(EPC)行为,然而,有关黄嘴白鹭的婚配制度、EPC的产生机制以及其是否会导致婚外父权(EPP)现象还未清楚。此外,许多集群繁殖的鸟类都存在种内巢寄生(CBP)现象,而关于黄嘴白鹭巢寄生行为的研究也尚未开展。因此,本研究围绕黄嘴白鹭的婚配制度问题,主要开展以下几方面研究: (1)对3种非损伤性样品 ...
戴宇飞
core
Evaluating the empirical basis for threat attribution in the IUCN Red List
Abstract Understanding the impacts of different threats on species is key to successful conservation interventions and policies. The International Union for Conservation of Nature (IUCN) assesses threats to species, and the organization's Red List of Threatened Species is a key conservation tool.
Ena Humphries +5 more
wiley +1 more source
物种谱系是种群管理的必要前提,大猩猩被列为IUCN极危物种。中国动物园大猩猩圈养种群始于1973年,截至2013年12月31日,共有8只存活个体。为了更好地科学管理中国动物园大猩猩圈养种群,对收集到的大猩猩中国区谱系及其扩展谱系进行了统计学与遗传学分析。结果表明,种群平均增长率λ=0.968,呈下降趋势。种群奠基者共14只,潜在奠基者1只。种群保留了野生个体87.24%的基因多样性,无近亲繁殖情况。根据现状分析结果,中国动物园大猩猩圈养种群是一个极小的种群,该种群的发展壮大有待于加强国内自身繁殖 ...
廖 辉 袁 梨 殷毓中 张邓华 姚 勇 钟 灵 周 俊
doaj

