Results 21 to 30 of about 7,934 (168)
Classification and phylogeographical analyses of Siphonaria and Cellana limpets in China and Southeast [PDF]
, 2015 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
core
Conservation Biology, EarlyView.Abstract Measuring area‐based conservation outcomes in tropical forests is challenging due to cryptic human disturbances (e.g., hunting). As a result, comparative studies of management strategies providing quantitative outcomes remain scarce, especially in the Neotropics.
Lucy Perera‐Romero +5 more
wiley +1 more source
野生动物学报, 2022 2019年和2020年的4—9月,采用样带调查法对江西南矶湿地国家级自然保护区爬行动物开展了资源调查,系统分析了南矶保护区爬行动物群落结构、丰富度及空间分布格局。结果表明:区内共记录爬行动物2目6科11种,其中灰鼠蛇(Ptyas korros)和台湾小头蛇(Oligodon formosanus)为保护区物种新纪录; 短尾蝮(Gloydius brevicaudus)为优势种,种群数量占总数的44.07%。从分布型构成上划分,季风型(E)4种、南中国型(S)4种和东洋型(W)3种。多样性分析表明 ...
缪泸君 +5 more
doaj
, 2007 通过线粒体Cytb基因全序列分析,探讨了青海湖裸鲤和花斑裸鲤的起源关系及其进化模式.系统发育分析进一步支持了青海湖裸鲤和花斑裸鲤3个mtDNA谱系的划分.形态上具有高鳃耙变异的个体未形成特有的进化枝,证明了第一鳃弓外鳃耙变异并不具有系统发育意义.对青海湖裸鲤和花斑裸鲤进化枝扩散模式的网络分析表明,黄河独有的单倍型A1是一个创立者单倍型,全部青海湖裸鲤的样品来自于它的辐射,而青海湖裸鲤可能仅仅起源于黄河花斑裸鲤两个主要支系中的一个 ...
何舜平 +5 more
core
Conservation Biology, EarlyView.Abstract Illegal wildlife trade (IWT) is one of the largest global illegal activities, and it negatively affects biodiversity and sustainable development worldwide. DNA barcoding coupled with high‐throughput sequencing (i.e., metabarcoding) is useful in identifying taxa affected by IWT and has been used routinely for decades.
Maria Joana Ferreira da Silva +9 more
wiley +1 more source
Zhejiang Daxue xuebao. Lixue ban, 2015 对东白山（Dongbaishan，DBS）1 hm2森林样地内胸径≥1 cm的木本植物进行统计，初步分析了样地的区系成分、物种组成、群落结构和α多样性.结果表明：样地内共计木本植物48种，隶属23科36属，总计5 493株，以常绿树种为主，共25种，占总优势度的98.18%，重要值的95.22%，总个体数的96.65% ；群落内有明显的优势种、偶见种和部分稀有种，木荷（Schima superba）和马尾松(Pinus massoniana）占显著优势；偶见种和稀有种分别占总物种数的35.42%和20 ...
WANGYunquan(王云泉) +7 more
doaj +1 more source
Long-term changes of diatom community in the frequent HAB areas of the East China Sea and the morphological response of typical species to physio-chemical variables [PDF]
, 2016 硅藻是浮游植物的主要组成类群，与浮游植物群落演替和赤潮发生密切相关。我国长江口及临近海域近十几年来频发赤潮，其发生机制比较复杂，为了探讨硅藻长周期变化与赤潮发生的关系，本研究于2002年至2013年间，通过藻华973航次在长江口及临近海域典型赤潮高发区分别进行19个航次的浮游植物拖网和水样采集，共获得浮游植物样品3417个，进行了硅藻种类组成与数量分析，研究了其年际变化、季节变化和地理分布及其受控因素。 一般情况下，浮游植物群落中硅藻在种类和数量上都占优势地位 ...
刘昱涵
core
Success of restoration strategies in preventing extirpation of 2 critically endangered coral species
Conservation Biology, EarlyView.Abstract An unprecedented marine heatwave in 2023 caused widespread coral bleaching and mortality throughout the Caribbean. In the Florida Keys (USA), 2 foundation species, elkhorn coral (Acropora palmata) and staghorn coral (Acropora cervicornis), were severely affected.
Erinn M. Muller +29 more
wiley +1 more source
Zhejiang Daxue xuebao. Lixue ban, 2008 采用PCR技术获得了唇(Hemibarbus labeo )和花（H. maculatus）线粒体DNA细胞色素氧化酶(COⅡ)基因部分序列，将所得的COⅡ基因序列与4种取自GenBank的属鱼类同一基因序列进行了分析，以探讨这一序列在种质鉴定、种群遗传结构和分子系统发生研究中的应用价值.测序结果表明，在实际分析的600 bp序列中，序列A+T含量(56.9%~57.8%)高于G+C含量，物种间共有变异位点116个，其中简约信息位点46个；唇和花2个地理种群间变异位点均为11个，唇种群间碱基替换均为转换，
LÜYao-ping(吕耀平) +3 more
doaj +1 more source
In vitro culture, cryopreservation, and field reintroduction of the endangered Mingan thistle
Conservation Biology, EarlyView.Abstract Current plant conservation efforts are hindered by, for example, poor seed germination, low viability, and insufficient propagation and preservation technologies. To address these problems, we devised an approach to plant conservation that integrates conservation, preservation, and restoration (CPR), which uses advanced in vitro techniques. We
Mukund R. Shukla +4 more
wiley +1 more source