Results 61 to 70 of about 107,409 (290)

Using online reports of seahorse seizures to track their illegal trade

open access: yesConservation Biology, EarlyView.
Abstract Illegal wildlife trade (IWT) is a persistent and extensive threat to global biodiversity. Hundreds of marine fish species are subject to regulation under the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES), but it is unclear how much protection species gain from CITES because information on marine fish ...
Sarah J. Foster   +3 more
wiley   +1 more source

The Main Community Structure Characteristics of Fishes in Zhangjiang Estuary Mangrove National Nature Reserve [PDF]

open access: yes, 2015
本研究于2013年8月、11月、2014年3-4月、5-6月在漳江口红树林保护区三条断面进行了夏、秋、冬、春四个季节的采样,分析了漳江口红树林区鱼类的种类组成、优势种、生态类群和物种多样性及其季节变化和空间分布,探讨了主要优势种四季的体长变化特征和代表种在不同断面的体长特征,并用多元统计分析方法(聚类分析、非度量多维标度分析nMDS、相似性分析检验ANOSIM、相似性比例分析SIMPER)分析了鱼类群落结构的时空变化特征。此外,本文还初步探讨了漳江口红树林区做为鱼类产卵场、索饵场和庇护所的可能性和价值 ...
钟慧琪
core  

城市化对多疣狭口蛙生境影响

open access: yes野生动物学报, 2016
城市的扩张是全球发展的一个大趋势,而这一趋势带来的生态影响已成为生态研究的热点。为了探究昆明城市发展对当地多疣狭口蛙(Kaloula verrucosa)生境的影响,于2008年7月与2009年7月使用样方法对昆明市4个主城区内多疣狭口蛙的生境进行了调查,收集生境中的因子数据,将生境分类后对因子数据进行显著性分析比较,结果显示,不同类型生境间除了水体底质、周边地面高度差、人为活动频率以及水泥覆盖度4项因子差异不显著外,其他因子有显著或极显著差异。根据数据分析结果和实地调查分析的结论显示 ...
朱 彦 张 庆 李明会
doaj  

黄盖湖春夏季鸟类群落结构初步研究

open access: yes野生动物学报, 2020
2018年春、夏季,采用样线法对黄盖湖5种生境类型鸟类群落结构进行调查。记录鸟类15目40科119种25816只,雀形目占51.26%,反嘴鹬(Recurvirostra avosetta)、灰翅浮鸥(Chlidonias hybrida)是优势种,主要居留型留鸟50种。3月鸟类最丰富(87种,9084只),4月鸟类最少(60种,2677只),不同月份间鸟类多样性指数、均匀度指数、优势度指数差异不显著。鸟类群落结构生境间变化明显,养殖塘中鸟类最丰富(77种,9716只),明水面最少(15种,1917只),
郑猛 1   +6 more
doaj  

A global indicator of species recovery

open access: yesConservation Biology, EarlyView.
Abstract Monitoring progress toward meeting global biodiversity goals involves several indicators, including, at the species level, the International Union for Conservation of Nature (IUCN) Red List Index (RLI) and the Living Planet Index (LPI). However, at present, there is no indicator specifically for tracking species recovery, despite this being ...
H. Resit Akçakaya   +4 more
wiley   +1 more source

Endemic plants in coastal zone and islands in South China and construction of vegetation landscape on islands [PDF]

open access: yes, 2015
我国南方海岸带及海岛有丰富的植物资源。在海岸带及海岛大开发的背景下,植物资源的保护和合理利用在构建生态安全屏障、绿化和美化方面具有举足轻重的地位。由于生境特殊,海岸带及海岛植物具有特有种比例高和分布区狭窄的特点。在自然因素和人为因素的双重作用下,我国南方海岸带及海岛植物资源正在经历大规模的衰退。此外,土壤盐渍化、盐雾、干旱及大风等不利环境条件给沿海防护林建设、城镇和道路绿化、海岛植被修复等带来了诸多困难,盐害问题日益突出。抗风、耐土壤盐、耐盐雾植物资源的筛选和利用,以提高存活率 ...
张琳婷
core  

Isolation and Identification of Secondary Metabolites from Halophytic Helianthustuberosus Tuber-Derived Fungus [PDF]

open access: yes, 2016
盐生植物菊芋(Helianthus tuberosus)是一种新型经济作物,特殊生境可能会使其内生真菌产生特殊的次生代谢产物,如结构新颖或活性显著的化合物.为研究这种耐盐植物内生真菌的次生代谢产物以及植物宿主和内生真菌之间可能存在的关系,本实验室从耐盐菊芋块茎中分离纯化出10株内生真菌,对这10株内生真菌进行抗卤虫活性筛选,初步筛选出1株抗卤虫活性良好的菌株Mucor sp.ht-7,规模发酵后通过提取分离技术得到7个化合物,用波谱手段鉴定了7个化合物的结构 ...
季乃云   +3 more
core   +1 more source

Finding floral and faunal species richness optima among active fire regimes

open access: yesConservation Biology, EarlyView.
Abstract Changing fire regimes have important implications for biodiversity and challenge traditional conservation approaches that rely on historical conditions as proxies for ecological integrity. This historical‐centric approach becomes increasingly tenuous under climate change, necessitating direct tests of environmental impacts on biodiversity.
Zachary L. Steel   +8 more
wiley   +1 more source

Effect Assessment of Marine Ecological Restoration:A Case Study of Sansha Bay [PDF]

open access: yes, 2016
由于人类对海洋资源的无序开发,海洋生态系统面临着环境恶化、结构失调、功能衰退等诸多问题,并逐渐制约海洋的可持续发展。海洋生态修复作为当前缓解生态系统退化压力、恢复受损生态系统结构功能的重要手段,是海洋生态系统管理的核心内容之一。但目前针对海洋生态修复的研究大多以针对单一生境的修复技术措施为主,缺乏对海洋生态系统各组分综合修复的系统研究,对如何评判海洋生态系统修复的效果,更是关注甚少。科学合理的对海洋生态修复实践进行评价,可以及时掌握生态系统对人工修复的响应和反馈 ...
李倨莹
core  

Predictions of southern migration timing in coastal sharks under future ocean warming

open access: yesConservation Biology, EarlyView.
Abstract Projected redistribution of marine species due to ocean warming may undermine current conservation efforts. Yet, there have been few studies on how ocean warming may alter migration timing. Across 5 years of acoustic telemetry data (2018–2022), we determined environmental drivers of southward migration timing for 6 migratory shark species from
Maria H. Manz   +16 more
wiley   +1 more source

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