Results 61 to 70 of about 7,934 (168)
Study on changes of ecological characteristics of four demersal fishes in the Taiwan Strait and its adjacent sea [PDF]
, 2014 鱼类的生活方式、鱼类种群数量变动的规律、控制及预报其数量变化的趋势等是鱼类生态学研究的重要内容，其研究结果可为渔业资源保护和开展渔业生态系统管理提供依据。鱼类生态学特征的变化，尤其是鱼类种群数量和生态学参数的变化的研究结果可以为管理和利用渔业资源提供预警。本文选取台湾海峡及其邻近海域四种底层及近底层鱼类开展其生态学特征变化的研究，以期能为台湾海峡及其邻近海域的渔业资源保护和生态系统管理研究提供数据基础。 台湾海峡位于中国的东南部，是连接东海和南海的重要通道，台湾海峡及邻近海域拥有我国著名闽东渔场 ...
鞠培龙
core
The Inclusion Trade‐Off: Comparing the Design and Functionality of Collaborative Governance Forums
Policy Studies Journal, EarlyView.ABSTRACT Environmental challenges require collaboration across jurisdictions, often through forums or intermediary spaces for repeated interaction. A persistent forum design question concerns inclusion criteria, or which actors should be included.
Adam Wiechman +3 more
wiley +1 more source
岷江上游山地森林/干旱河谷交错带不同植被恢复模式对根际土壤微生物量碳氮及固氮菌群落结构的影响
Shuitu Baochi Xuebao, 2011 以岷江上游山地森林/干旱河谷交错带5种植被恢复模式的根际与非根际土壤为研究对象,对土壤微生物生物量碳、氮和土壤固氮菌群落结构的影响进行了初步研究.结果表明,5种不同植被根际与非根际土壤的微生物生物量存在显著差异且根际土壤含量大于非根际土壤,依次为:青冈次生林＞灌木林＞刺槐林＞人工幼林＞针阔混交林;DGGE图谱显示,5种植被根际与非根际土壤固氮类群有一条明显的共有条带,其中刺槐林和灌木林的固氮菌多样性最高;多样性指数、群落丰富度分析表明,灌木根际土壤固氮菌的群落种群结构最丰富,其次为刺槐;聚类分析结果显示,
钟熙敏 +6 more
doaj
Mating system, brood parasitism and extra-pair behaviour in the Chinese egret (Egretta eulophotes) basing on the microsatellite technology [PDF]
, 2015 动物的婚配制度影响着个体的繁殖成功率，直接关系到群体的遗传多样性和种群动态的发展变化，是保护遗传学和生态学领域中非常重要的研究内容。已有学者野外观察到黄嘴白鹭（Egrettaeulophotes）存在婚外交配（EPC）行为，然而，有关黄嘴白鹭的婚配制度、EPC的产生机制以及其是否会导致婚外父权（EPP）现象还未清楚。此外，许多集群繁殖的鸟类都存在种内巢寄生（CBP）现象，而关于黄嘴白鹭巢寄生行为的研究也尚未开展。因此，本研究围绕黄嘴白鹭的婚配制度问题，主要开展以下几方面研究： （1）对3种非损伤性样品 ...
戴宇飞
core
Wildlife Letters, Volume 4, Issue 1, Page 10-22, March 2026.In this study we analyze the role of phylogeny, environment, and community structure on sociality. Using structural equation modeling (SEM) we aim to quantify the direct and indirect impacts of variables on behaviors including social grouping, reproduction, and space use among Carnivora species.
Jessica Ward +3 more
wiley +1 more source
Bacterial Conversion of Sulfur-and Phosphorous-Compounds and Microbial Diversity in Sediments from a Near-Shore Marine-Cultural Region [PDF]
, 2005 对福建某近海养虾场底泥环境中硫和磷 2种元素的微生物代谢进行了研究 .结果表明 ,细菌代谢有机硫和无机硫产H2 S是养殖过程中造成H2 S污染的主要因素 ,利用半胱氨酸和硫代硫酸钠产生硫化氢的细菌数量分别为 1 .6× 10. 6和 4 . 35× 10. 3个·g-1底泥 ;进一步研究发现 ,芽孢杆菌属、盐芽孢杆菌属和微杆菌属等细菌是产H2 S的优势菌群 ,而硫酸盐还原菌的数量较少 ,仅为 2 5个·g-1,其产H2 S的作用不明显 .研究还发现 ,转化有机磷和无机磷酸盐的优势菌群属于好氧细菌 ...
刘双江 +5 more
core
Application of Specific Fragment Length Polymorphism of Algae rDNA in Identification of Drowning Cases#br# [PDF]
, 2018 Objective To identify the drop-off location of victims in drowning cases, and confirm whether it is a fatal drowning or the victim is thrown into the water after death by detecting part of 5.8S sequence and second internal transcribed spacer （ITS2） （5.8S+
YUAN Wen-yong, TANG Xiao-hui, ZHOU Shun-ping，et al.
core +1 more source
Functional Ecology, Volume 40, Issue 3, Page 636-654, March 2026.Read the free Plain Language Summary for this article on the Journal blog. Abstract The nested subset pattern (nestedness) has been widely used to explain species distributions in island and fragmented systems. Mountain sky islands serve as critical natural laboratories for understanding the evolutionary consequences of geographic isolation and climate
Caiwen Zhang +5 more
wiley +1 more source
野生动物学报, 2021 以陕西省第4次大熊猫（Ailuropoda melanoleuca）调查数据为基础，通过文献查阅及走访调查，对陕西秦岭地区大熊猫种群数量及扩散、栖息地消长、保护管理现状进行客观分析。结果表明：与第3次调查时相比，大熊猫种群数量增长、种群及栖息地扩散明显；但种群发展及生境威胁尚未解除，仍面临种群分割、内部竞争压力大、遗传压力加剧、栖息地破碎程度加大、潜在栖息地增长缓慢且质量较低、不确定性因素增加以及人为干扰等问题。以现状为基础，从实际问题出发，以保护规划的视角提出构建秦岭大熊猫“一心两翼多点 ...
南晓娜王茸仙张新兵
doaj
Review of Policy Research, Volume 43, Issue 2, March 2026.ABSTRACT This study adapts the Multiple Streams Framework (MSF) to explore why COVID‐19 vaccine mandates were applied at sectoral and subnational levels in Vietnam while the central government maintained that vaccination was voluntary. Document analysis reveals that these mandates arose from the effective coupling of the three streams—problem, policy ...
Hang Duong, Katie Attwell
wiley +1 more source