Results 91 to 100 of about 19,473 (256)
The Main Community Structure Characteristics of Fishes in Zhangjiang Estuary Mangrove National Nature Reserve [PDF]
, 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
Infant Mental Health Journal: Infancy and Early Childhood, Volume 46, Issue 4, Page 424-444, July 2025.Abstract Acknowledging that the parent–child attachment is a dyadic relationship, we investigated differences between pairs of parents and preschool children based on gender configurations in the association between attachment and problem behavior.
Magda Matetovici +4 more
wiley +1 more source
野生动物学报小飞鼠（Pteromys volans）为树栖夜行滑行类啮齿动物，过去不合理的森林采伐已导致其生存受到一定威胁，亟需对其种群的遗传变化，特别是遗传多样性和近交衰退等种群遗传信息开展进一步评价，增强保护与管理的针对性。利用微卫星分子标记对黑龙江省南部4个小飞鼠种群进行遗传多样性分析。结果显示：8个微卫星位点检测出种群平均等位基因数为12.9（12.0 ~ 14.4）个，有效等位基因数为8.6（8.1 ~ 8.8）个，观测杂合度为0.887（0.832 ~ 0.925），期望杂合度为0.872（0.865 ~
田新民 +3 more
doaj
野生动物学报, 1999 种群的灭绝两栖动物是脊椎动物的一大类群,从世界范围来看正在不断灭绝,而且种群的灭绝率随时间在加大.如丹麦博恩岛上的无斑雨蛙（Hyla arborea）,其灭绝率19501960年为36%,19601970年为45%,19801990年为60%.19771986年在丹麦调查的1300个地点与40年代和60年代的资料相比较,发现50%的种群消失了,其余种群也极大地减小了.珍稀种比普通种减少更快.对两栖动物种群的监测需要长期进行,否则有可能得出错误结论 ...
江建平, 周开亚
doaj
‘How Does Living in Institution Impact Young Lives?’—Insights From Young People in Ci'aiyuan
Children &Society, Volume 39, Issue 4, Page 760-769, July 2025.ABSTRACT Institutional care often carries a negative reputation due to its perceived adverse effects on children and young people. However, it remains a significant form of alternative care in China. In Xiangxi, childcare institutions, known as ci'aiyuan, have been further expanding by involving wider populations in recent years.
Shian Yin
wiley +1 more source
污水处理厂中浮游生物群落DNA指纹及其与水质指标的关系 [PDF]
, 2008 以武汉龙王嘴污水处理系统为研究对象,揭示了污水处理各阶段中浮游生物群落的DNA指纹拓扑结构,进而探索了其与浮游生物群落结构和环境理化因子的关系.首先建立了污水处理系统中浮游生物群落总DNA提取方法,然后用原核与真核特异性引物对流程(A2/O氧化沟工艺)中不同阶段的浮游生物群落总DNA进行PCR扩增,用变性梯度凝胶电泳(DGGE)检测,并对平行水样分别进行常规理化因子和浮游生物物种的检测与鉴定.结果显示,各采样点理化因子、物种组成与浮游生物DNA指纹的统计分析结果十分吻合,厌氧、缺氧和好氧阶段间差异较小,
余育和 +4 more
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Equine Veterinary Journal, Volume 57, Issue 4, Page 1053-1064, July 2025.Abstract Background In Great Britain, owners are keeping their horses into increasingly older age, reflecting societal changes in human–animal relationships. The uptake of routine veterinary services is reported to reduce as horses age. Horse owners seek information regarding their animal's health from alternative sources before and/or following ...
Rebecca Smith +4 more
wiley +1 more source