Natural history of the Lined Seedeater Sporophila lineola (Aves: Thraupidae) in southeastern Brazil

The Lined Seedeater (Sporophila lineola) is a migratory species that inhabits a variety of open habitats in South America. We studied the breeding biology and territorial behaviour of a colour-banded population of the species in the Universidade Federal de Viçosa, Campus Florestal (1–19,8808ºS, –44,4136ºW), during two breeding seasons (2014/2015 and 2015/2016), which spans from December to April. We monitored 74 nests of this species. The nest is a low cup supported between a fork. Nests are mainly built with grass stems and rootlets, with spider-web used to hold the material together and to bind the nest to its supporting plant. Females are solely responsible for nest building and incubation, which is synchronic, and also for feeding nestlings to a large extent. Males are responsible for defending the territory, which corresponds to a small portion of the home range restricted to the nest environs, and also feed the nestlings. Mean clutch size is two eggs (78% of nests monitored), with clutches of three (20.3%) and four (1.7%) eggs also observed. Eggs are whitish, covered with dark brown blotches and spots to a variable extent. Mean incubation period, considered as the period between the onset of incubation and hatching of the first egg, is 11 days. Nestling period, considered as the period between hatching of the first egg and fledging of the last young, is 10 days. During the first breeding season, the simple percentage of successful nests was 34.1%, while the Mayfield success was 29.8%, with slightly higher values observed during the second breeding season, with 39.4% and 35.7%, respectively. We recorded, for the first time, three cases of polygamy in the species. We also recorded breeding site fidelity for the first time in the species, with males returning to the same territory owned in a previous breeding season.     

林木改良中育种群的概念应用和发展

育种群是组成整个育种群体的多个亚群体,其意义相当于农作物育种的近交系。在美国的一些林木育种项目中,育种群已用来控制种子园的近交、捕获最大的遗传增益的有效措施。育种群的建立不会改变各群内的育种值,但每个育种群内的遗传变异会随近交系数的增加而增加,这为我们在群内选优提供了更大的选择余地。此外,建立育种群只增加一些档案记录工作,并不增加野外工作量。     

虎纹伯劳的繁殖习性

虎纹伯劳(Laniuzs tigrinus Drapiez)为次生林中较常见的鸟类,是森林益鸟,在长白山区主要分布在海拔300～800米的山地次生林中,关于它的繁殖习性,国内曾有过零星报导(刘焕金等1983,傅桐生等1984),我们于1985～1988年3～7月在长白山区的松花湖自然保护区、天岗林场、左家自然保护区及长白山自然保护区二道,共获得六个巢的资     

花鲈种质资源的研究进展

中、日、韩三国学者对花鲈分类、人工繁殖和养殖技术作了研究,日本学者提出中日花鲈为两种,有待分子水平上的进一步研究确认。花鲈种质问题亟待解决,可通过现代生物技术予以解决。该问题的解决可为花鲈资源保护和持续利用提供理论依据。     

日本观赏水稻的育种及栽培应用

本文介绍了观赏水稻育种的遗传基础，日本观赏水稻育成的品种类型，近年来观赏水稻的栽培应用及部分观赏水稻品种的主要特征特性。     

杉木基因型与环境交互效应的AMMI模型分析

对选自中国南方的１１２个杉木自由授粉家系在八个测试点进行了生长性状的遗传评定。ＡＭＭＩ（加性主效应与复合交互效应）模型分析揭示存在着显著的家系与地点交互效应。根据家系平均ＡＭＭＩ估算和交互第一主分量轴得分对地点所作的聚类分析，以及地点间的遗传相关分析，测试点被划分成四个地点群，有证据表证，就生长性状而言，杉木的育种区早分可能与地理区域尤其是纬度带相重叠。１１２个自由授粉家系依据其交互ＰＣＡ１及平均     

红皮洋葱新品种“昌激99-3”的栽培技术要点及应用推广

用激光诱变选育出的红皮洋葱新品种“昌激99—3”,具有高产、优质、抽苔率低的特性。本试验通过对该新品种的品比试验,研究其高产栽培技术要点,从而为生产上该新品种的应用推广提供技术上的支持,使该新品种能更好的发挥其高产、优质、抽苔率低的品种特性。     

核酸分子杂交检测黄瓜花叶病毒

为检测黄瓜花叶病毒的存在,应用Northernblot,将提取的黄瓜花叶病毒RNA样品,经甲醛变性凝胶电泳分离,使RNA解离成单链,然后用上行毛细管转移法,将凝胶上的单链RNA片段转移到尼龙膜上.经适当洗涤、干燥后,在烤箱中80℃保温2h,用于杂交.以带有黄瓜花叶病毒目的片段的细菌质粒制备DNA探针,用放射性同位素32P标记探针DNA,100℃变性处理用于杂交的探针,然后进行杂交.结果表明,在杂交膜上显示与特异性探针结合的阳性RNA条带,检测到了黄瓜花叶病毒的存在.     

黄芪多糖对繁殖猕猴生长性能、血液生理生化指标及腹泻发病率的影响

目的 通过饲喂黄芪多糖对繁殖猕猴生长性能、血液生理生化及腹泻发病率的影响,研究黄芪多糖在实验动物饲养管理中的应用。方法 选取不同年龄阶段的繁殖猕猴60只在饲料中添加0. 1%的黄芪多糖,每日饲喂一次。实验前、实验1月后、实验3月后分别采血测生理和生化指标、称体质量、统计腹泻发病率。结果 随着黄芪多糖添加时间的延长,体质量都成上升的趋势,血常规中白细胞、淋巴细胞数也呈上升趋势。血液生化中谷草转氨酶、谷丙转氨酶、总胆红素、尿素、总胆固醇、甘油三酯、高密度脂蛋白胆固醇、低密度脂蛋白胆固醇、镁、C 3 、C 4 、IgA、IgG都呈上升趋势,血糖呈下降趋势;随着黄芪多糖添加时间的延长,繁殖猕猴腹泻的数量也呈下降的趋势。结论 黄芪多糖能明显提高繁殖猕猴的饲料利用率、有效调节免疫力、对繁殖猕猴的腹泻也有很好的预防和治疗作用。     

VHS录像机HQ技术的探讨

本文阐述VHS录像机HQ技术的主要内容以及如何运用HQ技术改善重放画面的质量。