Results 31 to 40 of about 11,190 (177)
Population genetic structure and phylogentic analysis for Morone americana in Delaware Bay of United States [PDF]
, 2016 美洲狼鲈(Moroneamericana，Gmelin，1789)隶属于鲈形目(Perciformes)，狼鲈科(Moronidae)，狼鲈属(Morone)，别名美洲白鲈、白石鮨。美洲狼鲈是在美国东海岸浅海区域十分常见的一种溯河洄游鱼类，每逢春末夏初，生活于近海和河口区域的美洲狼鲈便溯河洄游至河流中上游产卵繁衍。美洲狼鲈也经常被用作海区污染程度的指示种。鉴于美洲狼鲈广泛的分布范围以及巨大的种群数量，其十分适合作为近岸洄游性鱼类群体研究的模式种类。同时，其在检测环境污染方面也具有主要作用 ...
边力
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Distribution, scale, and drivers of mass mortality events in Europe's freshwater bivalves
Conservation Biology, EarlyView.Abstract Mass mortality events (MMEs) are decimating populations and compromising key ecosystem functions around the globe. One taxon particularly vulnerable to MMEs is freshwater bivalve mollusks. This group has important ecosystem engineering capacities and includes highly threatened and highly invasive taxa.
Daniel A. Cossey +39 more
wiley +1 more source
, 2005 对行为的定义和描述是定量开展行为学研究的前提与基础。通过对人工饲养环境下长江江豚行为的观察、记录和分析,定义和描述了长江江豚近40种行为。在此基础上,初步构建了人工饲养环境下长江江豚行为学研究所必需的行为谱,由活跃的水面行为、玩耍、索食、社群行为、性行为、休息、摩擦、杂类八个类别组成 ...
肖建强,王丁
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The collective application of shorebird tracking data to conservation
Conservation Biology, EarlyView.Abstract Addressing urgent conservation issues, such as the drastic declines of North American migratory birds, requires creative, evidence‐based, efficient, and collaborative approaches. The abundance of over 50% of monitored North American shorebird populations has declined by over 50% since 1980. To address these declines, we developed a partnership
Autumn‐Lynn Harrison +71 more
wiley +1 more source
Endemic plants in coastal zone and islands in South China and construction of vegetation landscape on islands [PDF]
, 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
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How much biotic nativeness matters across human demographic groups
Conservation Biology, EarlyView.Abstract Many central concepts of conservation biology—such as nativeness—are structured by ecological and social factors. However, the social consequences of using these concepts to make conservation decisions remain inadequately understood. Some researchers argue that nativeness, rather than acting as an objective proxy for important ecological ...
Harold N. Eyster, Rachelle K. Gould
wiley +1 more source
Diversity and distribution of the nematocyst from jellyfish [PDF]
, 2017 水母(jellyfish)是海洋浮游动物中的重要类群之一，在我国沿海广泛分布，部分水母种类其触手、口唇、口触手及外伞上分布着大量的刺丝囊(cnidocyst)。刺丝囊是刺胞动物区别于其他动物门的一个重要特征，可根据其释放后刺丝结构进行分类，具有显著多样性。国内有关刺丝囊的研究较少，而且大部分研究都仅限于光镜条件下，因此对水母刺丝囊形态结构以及分类进行系统深入的研究是非常有必要的。本文以常见30种水母为研究对象，运用光学显微镜和电子显微镜技术对水母不同组织中的刺丝囊形态进行观察与比较，对刺丝囊形态、大小 ...
吴水仙
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Differences in characteristics between naturalized threatened plants and other threatened plants
Conservation Biology, EarlyView.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
Shuitu Baochi Xuebao, 2011 通过对荒漠草原4种典型植物群落(蒙古冰草群落、甘草群落、赖草群落、沙蒿群落)枯落物蓄积量的调查,结合室内持水试验,运用数理统计的方法分别得到4种典型植物群落枯落物的蓄积量、最大持水量、吸水速率等水文特征参数。结果表明:荒漠草原不同植物群落枯落物蓄积量在50.8～396.2g/m2,其蓄积量由大到小为蒙古冰草群落>甘草群落>赖草群落>沙蒿群落,与植物群落地上生物量变化是一致的;4种植物群落枯落物最大持水量存在一定差异,蒙古冰草群落、甘草群落、赖草群落、沙蒿群落枯落物最大持水量分别相当于0.934,0 ...
李学斌 +6 more
doaj
Survival strategy of Calanus sinicus in the northwest of the South China Sea [PDF]
, 2015 中华哲水蚤（Calanussinicus）是我国近海生态系统的特征种之一，在我国浮游生物学和近海生态系统动力学研究中具有重要意义。本文基于2006~2007年在南海西北部进行的四个季节的航次调查，研究了中华哲水蚤的空间分布和季节变化，以广义可加模型为工具量化分析了影响中华哲水蚤丰度变化的重要环境因子，同时探讨了南海西北部中华哲水蚤的种群来源和生存策略问题。主要研究结果如下： （1）中华哲水蚤的丰度变化具有显著的季节差异。在北部湾调查区域，春季平均丰度为2.37±8.00ind/m3，占桡足类总丰度的6 ...
杨璐
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