Results 41 to 50 of about 18,685 (204)

Assessing the Corn Belt as an anthropogenic barrier to migrating landbirds in the United States

open access: yesConservation Biology, Volume 39, Issue 5, October 2025.
Abstract Migrating landbirds adjust their flight and stopover behaviors to efficiently cross inhospitable geographies, such as the Gulf of Mexico and the Sahara Desert. In addition to these natural barriers, birds may increasingly encounter anthropogenic barriers created by large‐scale changes in land use. One such barrier could be the Corn Belt in the
Fengyi Guo   +7 more
wiley   +1 more source

Ecological study on plankton and water quality bioassessment of the Jiulong River Estuary [PDF]

open access: yes, 2015
本文以环保公益性行业科研专项“入海河口区水质标准和水环境质量评价方法研究(NO:201309007)”2013年9月~2014年4月4个季节的调查数据为基础,对九龙江口浮游生物的种类组成、时空分布、优势种、环境影响因素等进行了研究;基于环境因素和地理水文概况进行了区域划分,探讨了不同分区浮游生物的群落结构特点并对其水质进行了生物学评价。 主要的研究成果如下: 1、九龙江口浮游植物的种类组成和数量变化 本次调查共鉴定浮游植物150种(含变种和变型),隶属于5门63属,其中以硅藻占主导地位 ...
吴白洁
core  

On the normative roles of biodiversity and naturalness in conservation

open access: yesConservation Biology, Volume 39, Issue 5, October 2025.
Abstract Nature is an opaque concept. Consequently, the term biodiversity conservation has replaced nature conservation in most conservation contexts. We review the conceptual indeterminacies that plague the terms nature and natural but then show that comparable difficulties plague biodiversity.
David Saltz, Shlomo Cohen
wiley   +1 more source

黄河干流头道拐水文站水沙运动特征及影响因素

open access: yesShuitu Baochi Xuebao, 2021
为明确黄河干流头道拐水文站水沙运动过程、变化趋势及运动状态特征,以2006—2018年黄河干流头道拐水文站水沙数据为基础,基于累积距平法、R/S极差分析法、河道来沙系数与不协调度等研究方法,对头道拐水文站水沙运动过程进行系统分析。结果表明:头道拐水文站年际间径流与输沙量和年内月均径流与输沙量变化趋势均呈现良好的一致性,但两者的季节性差异特征显著,且输沙量的显著性较径流更突出;冬季径流与输沙量变化趋势同步性相比其他季节较差 ...
赵水霞   +6 more
doaj  

Anaerobic respiration and its influence on the carbonate system in estuarine sediment [PDF]

open access: yes, 2015
海洋是大气CO2重要的汇。自工业革命以来,海洋吸收的人为CO2已导致表层海水中的自由氢离子浓度升高了26%,海水pH降低了0.1个单位,同时,水体溶解无机碳(DIC)和HCO3-浓度升高,CO32-浓度降低,海水碳酸盐系统对CO2的缓冲能力降低。碱度(TA)的高低是海水对pH变化起缓冲作用的重要因素,一般地说,TA越高,则海水碳酸盐系统的缓冲能力越强。 每年通过河口输入海洋的DIC大致相当于全球海洋吸收大气CO2量的20%,与同时入海的TA一起对海洋碳酸盐系统产生重要影响 ...
胡玲
core  

Spatial Phylogenetic Analysis of Chinese Lizards: Insights Into Ecological Drivers and Conservation Gaps 中国蜥蜴系统发育的空间分析:生态驱动因素与保护空缺

open access: yesIntegrative Conservation, Volume 4, Issue 3, Page 430-441, September 2025.
Our study identifies southern China, including mountainous regions and islands, as key areas rich in phylogenetic diversity, and phylogenetic endemism of lizards that are currently under‐protected. Current protected areas however do not adequately cover regions that are critical for preserving the evolutionary history of lizards.
Tao Liang (梁涛)   +8 more
wiley   +1 more source

Dry and Wet Deposition Characteristics and Anthropogenic Sources of Atmospheric Mercury in Xiamen [PDF]

open access: yes, 2016
大气汞是危害人体健康的毒性污染物。大气中不同形态的汞具有不同的理化特性,颗粒态总汞TPM(Totalparticulatemercury)沉降速率高,能在排放源附近沉降,对区域内的生态环境造成较大的危害;大气气态总汞TGM(Totalgaseousmercury)因其具有较低的水溶性和沉降速率,可在大气中停留0.5-2年,能够进行长距离传输,被认为是全球性污染物。目前欧美地区已经广泛地建立起汞监测网络,虽然国内的大气汞监测也陆续开展起来,但是长时间持续监测尚不多见。本研究基于实验室前期的研究成果 ...
陈强
core  

Is the Asian Openbill Migratory? Population Status and Habitat Use in Eastern Nepal 钳嘴鹳是否迁徙?尼泊尔东部地区的种群现状与栖息地利用

open access: yesWildlife Letters, Volume 3, Issue 3, Page 109-117, September 2025.
We found that the Asian Openbill primarily roosted near waterbodies and frequently used farmland habitats, with significantly higher populations observed during the breeding season. Farmland and wetland areas exhibited a positive effect on the species' habitat use.
Ganesh Tamang   +3 more
wiley   +1 more source

广西弄岗北树鼩的日活动节律及其季节性变化

open access: yes野生动物学报, 2022
为了解栖息地和气候变化对北树鼩(Tupaia belangeri)活动的影响,于2012年8月—2013年7月采用红外相机技术对广西弄岗国家级自然保护区15 hm2森林动态监测样地及其周边区域内的北树鼩进行监测,采用核密度估计、重叠指数及相对活动强度指数分析其日活动节律及季节性变化规律。结果表明:北树鼩的日活动节律模式属于晨昏活动类型(日活动高峰期:07:00—08:00、16:00—17:00)。不同月份间北树鼩的活动强度指数(t=13.072,df=11 ...
唐创斌 刘志尚 黄振华 姚维 林建忠 汪国海 周岐海
doaj  

Bird community structures and their seasonal variations among Hangzhou urban woodlots(杭州市园林鸟类群落结构及其季节变化)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2005
园林鸟类是城市环境质量的重要指标,也是城市自然保护和生态建设的重要组成部分.1997年10月至1998年12月,通过选取杭州市区20个主要园林,根据季节每月一至两次调查园林鸟类的物种和数量,对杭州市园林鸟类的群落结构及其季节变化进行了分析探讨,结果显示:全部园林中共记录到鸟类82种,其中迁徙鸟类50种,占61%,留鸟32种,占39% ;园林鸟类群落呈现出较强的季节性,从全部园林总体上看,物种数和总数量呈现春秋两个高峰,夏季最低;从单个园林来看,多数园林鸟类群落物种数的最高峰集中在冬季 ...
WANGYu-jun(王玉军)   +2 more
doaj   +1 more source

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