Results 131 to 140 of about 17,401 (196)
This study reveals a shift in woody plant community assembly from competitive exclusion in early succession to habitat filtering in later stages within karst areas. Environmental distance (80.54%) contributed significantly more than geographical distance (9.95%), providing strong quantitative evidence that niche processes, particularly habitat ...
Hongfen Hu +5 more
wiley +1 more source
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
Jellyfish blooms restructure plankton dynamics and trophic linkages in coastal waters
Read the free Plain Language Summary for this article on the Journal blog. Abstract Jellyfish blooms are increasing globally in frequency and intensity, introducing complex ecological interactions, yet the mechanisms by which they alter ecosystem structure remain poorly characterized due to a lack of sustained field observations.
Pengpeng Wang +4 more
wiley +1 more source
ABSTRACT Previous research has established the relationships between motivation, anxiety, teachers’ support, and self‐regulated learning (SRL) in English‐as‐a‐foreign‐language (EFL) learning. Most of the studies, however, have taken a variable‐centered approach in addressing the variable correlations, while learners’ characteristics and variable links ...
Yuhong Jiao, Barry Bai, Jing Li
wiley +1 more source
由于人类活动、自然气候变化、动物自身等因素,导致中国特有的野生麋鹿种群于19世纪初叶在本土上灭绝。20世纪90年代,通过人类的保护活动,开始将麋鹿在原生地恢复野生种群。野生麋鹿走过了引种扩群、半散养行为再塑、放归自然3个阶段。经过14 a的艰辛努力,人们有计划地实施麋鹿野生放归和自由走出围栏形成野生种群,取得了较好的业绩。目前,中国已拥有大丰野生麋鹿群、石首野生麋鹿群、洞庭湖野生麋鹿群3大野生种群,麋鹿在野外经历了3个繁殖周期,野生麋鹿子三代(F3)已变为现实。截至2012年 ...
丁玉华 任义军 温华军 李鹏飞 高大立 常 青
doaj
ABSTRACT With the internationalisation of higher education, English medium instruction (EMI) has become increasingly common in non‐English‐speaking contexts. However, research highlights a range of challenges in EMI implementation, including insufficient collaboration between content and language teachers, limited professional development opportunities
Jingwen Zhou, Nadia Lamprecht
wiley +1 more source
本文综述了几种种群格局分析方法,以苍鹭营巢的分布格局为例,探讨了这些方法在野生动物种群生态学上的应用,为研究野生动物种群的数量动态及其行为规律提供了理论基础。
孙洪志, 段文英, 高中信
doaj
伴人种蝙蝠常栖居于人造建筑物,其活动引发的噪声和粪便污染易导致人蝠冲突,但人类态度如何影响蝙蝠种群动态尚不清楚。为此,本研究于2015—2023年每年6月,通过直接观察法和声学监测法,对黑龙江省6个东方蝙蝠(Vespertilio sinensis)繁殖种群进行了长期追踪,并结合问卷调查揭示了居民对其栖居的态度及其原因。结果表明:6个种群的动态模式呈现4种类型。(1)哈尔滨桥面缝隙种群数量保持稳定;(2)哈尔滨房檐种群、大庆秋林房檐种群和大庆铁西房檐种群分别在2015、2016、2017年集中消失或迁出;
卢冠军, 常诚, 朱文明
doaj
为揭示红喉歌鸲(Calliope calliope)黑龙江种群的遗传多样性和遗传结构,测定了85只个体细胞色素b基因序列,结合下载的135条同源序列进行综合分析。结果显示:黑龙江种群包含50个细胞色素b基因单倍型(1 143 bp),其中42个为独特的新单倍型,8个为共享单倍型。黑龙江种群具有较高的单倍型多样性(h = 0.934 0 ± 0.021 0),但核苷酸多样性较低(π = 0.003 0 ± 0.000 3),且二者均低于西伯利亚、远东岛屿及沿海种群。对此可能的解释是该种群过去经历了瓶颈事件,
姜川, 朱文文, 李波
doaj

