Results 121 to 130 of about 20,824 (277)

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  

The Role of Language Dominance in Congruency Effects on Multi‐Word Unit Processing: Evidence From Early Bilinguals

open access: yesInternational Journal of Applied Linguistics, EarlyView.
ABSTRACT This study investigates how the learner‐related factors of language dominance, encompassing language history, proficiency, use, and attitude, modulate congruency effects in multi‐word unit (MWU) processing among early bilinguals. Seventy Cantonese–Putonghua bilinguals completed lexical decision tasks measuring reaction time and accuracy for ...
Mingjia Cai, Yuan Liang
wiley   +1 more source

极端天气气候事件对宁夏野生动物种群安全的影响

open access: yes野生动物学报, 2009
通过问卷调查和样地调查方法,分析极端天气气候对宁夏野生动物种群安全产生的影响。极端天气气候对优势物种数量影响严重。雀形目种群安全主要受到沙尘暴、冰雹和暴雨的影响较大;迁徙鸟类种群安全主要受到沙尘暴、冰雹和暴雨的影响较大;啮齿类种群安全主要受到暴雨的影响较大;岩羊种群安全受到沙尘暴、冰雹、暴雨和降雪的影响。
刘晓红
doaj  

Species composition and community structure of deciduous broad-leaved forests in National Nature Reserves of Zhejiang Province(浙江省自然保护区落叶阔叶林群落物种组成与结构比较研究)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2014
群落组成是影响森林演替方向的主要因素之一.浙江省地处我国东部,属典型亚热带气候,全省植被类型多样,物种组成丰富.为了更好地了解浙江省自然保护区内落叶阔叶林群落结构,于2012年在浙江清凉峰自然保护区(QLF)、浙江天目山自然保护区(TMS)、浙江龙王山自然保护区(LWS)、浙江九龙山自然保护区(JLS)、浙江大盘山自然保护区(DPS)5个自然保护区内选取并建立了 12个30 m×30 m不同落叶阔叶群落样地,对样地中胸径(DBH)≥1 cm的木本个体进行了坐标定位和每木调查.结果表明 ...
WONGDongming(翁东明)   +7 more
doaj   +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]

open access: yes, 2016
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  

Digital Nationalism in Comparative Perspective: Trump Blaming China on Social Media in the United States and China

open access: yesNations and Nationalism, EarlyView.
ABSTRACT This study presents one of the first comparative analyses of digital nationalism on social media. Using a computational mixed‐method approach—combining supervised, computer‐assisted content analysis with network modelling—it analyses 64,541 tweets from Twitter and 91,063 posts from Weibo surrounding a shared geopolitical flashpoint: President ...
Chris Chao Su, Jun Liu
wiley   +1 more source

Assessing the Effect of Deservingness Cues on Tolerance for Administrative Burdens

open access: yesPolicy Studies Journal, EarlyView.
ABSTRACT Beneficiaries of public programs must overcome several administrative challenges. Given what we know about the politics of the welfare state, it seems likely that the public's willingness to support reductions in burdens may be associated with the characteristics of potential policy targets including their life circumstances and their race ...
Simon F. Haeder
wiley   +1 more source

动物园圈养种群的遗传学管理

open access: yes野生动物学报, 2004
随着自然环境的不断变化,许多物种受到野外生存环境的压力越来越大,已经濒临灭绝,建立圈养种群是对这些濒危物种进行保护的一种有效方法。如何使圈养种群长期健康地生存下去,并能够支持将来野生种群的恢复是现代动物园工作中需要解决的问题,为了达到这个目的,科学地对濒危珍稀物种圈养种群进行遗传学管理是非常重要的。
于泽英
doaj  

Home - About - Disclaimer - Privacy