Results 21 to 30 of about 11,348 (173)
Read the free Plain Language Summary for this article on the Journal blog. Abstract Ecological communities are stressed by rapid and complex anthropogenic changes, threatening the persistence of biotic interactions and ecosystem functioning. Plant–pollinator communities, for instance, undergo structural transformations as a result of land‐use change ...
Erliang Gao +8 more
wiley +1 more source
对中国白头鹤圈养种群的统计学和遗传学结果进行了相关分析,并对种群数量、年龄结构、性比情况、基因多样性、近交系数以及未来100 a种群的发展趋势进行了重点研究。结果表明:截止到2013年12月31日,中国圈养白头鹤种群共有存活个体76只,分别饲养于15家单位,其中建立者的数量为16只,潜在建立者的数量为41只。圈养白头鹤种群中育龄个体充足,但幼龄个体数量不足,种群年龄结构不是很合理。白头鹤种群保留了野生个体92.9%的基因多样性,平均近亲系数为0,是一个没有任何近亲繁殖的优质种群。通过分析发现 ...
何相宝 田秀华 李晓敏 周军英 尹惠媛
doaj
麋鹿自1985年重引进中国以来,经过繁殖扩群、行为再塑和野生放养试验3个阶段后,种群数量从79头发展至近7 000头(2018年底),先后形成江苏大丰、湖北石首和湖南洞庭湖野生麋鹿种群。通过对中国麋鹿种群发展现状调查分析,指出目前麋鹿种群健康发展面临的挑战和威胁因素,在扩大奠基种群数量、实施栖息地正向干预、加强疫病防控、开展基因交流等方面探讨中国麋鹿种群健康发展对策。
王立波 1 姜 慧 2 安玉亭 2 杨禹治 3 原宝东 4
doaj
Risk assessment for Indo-Pacific Humpback dolphin (Sousa chinensis) heavy metals exposure from ingestion of fish in the waters of Xiamen Bay [PDF]
中华白海豚是我国唯一一级保护海洋鲸豚,被誉“海上国宝”,在闽、粤、 港、台地区还被誉为“妈祖鱼”。在我国主要分布在广西、海南、广东、香港、 澳门、福建、台湾、浙江沿岸,喜在沿岸河口浅水域活动。20世纪80年代以 来,随着我国海岸带开发利用活动的增加,中华白海豚受到人类活动的不利影响 加大。厦门海域是中华白海豚的重要栖息地之一,而近年来伴随着厦门经济的发 展,中华白海豚面临着巨大的环境压力,水体环境污染成为危害白海豚健康的主 要因素之一。对多只厦门海域搁浅的白海豚的研究发现,其体内已累积多种重金 属元素 ...
刘婉欣
core
When and why to give shorebirds a head start
Abstract Headstarting is a translocation technique involving the hatching or rearing of wild eggs or young in captivity and the release of those individuals back to the wild at or before independence. It has been trialed as a conservation intervention for shorebirds over recent decades to improve the population trend of target populations by increasing
Lynda Donaldson +4 more
wiley +1 more source
根据2008~2009年实地考察研究结果,着重就该区2种有蹄类动物的分布、种群数量以及有关问题作概要性探讨。调查研究结果表明:(1)老虎台盘羊分布区盘羊平均密度=8.49/8=1.06只/km2,黑英山盘羊分布区盘羊平均密度=5.34/3=1.78只/km2。整个分布区盘羊种群数量1 488只,其中,老虎台分布区种群数量=480×1.06=509只,黑英山分布区种群数量=550×1.78=979只。(2)老虎台北山羊分布区北山羊平均密度=14.59/5=2.92只/km2 ...
阿布力米提·阿布都卡迪尔 +5 more
doaj
Population genetic structure and phylogentic analysis for Morone americana in Delaware Bay of United States [PDF]
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
core
The collective application of shorebird tracking data to conservation
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
Survival strategy of Calanus sinicus in the northwest of the South China Sea [PDF]
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
core
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

