共查询到16条相似文献,搜索用时 60 毫秒
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2009年2月28日,在陕西省成阳市沣渭湿地观测到18只家麻雀,并清晰拍摄到其中的2只(一雄一雌),经有关鸟类专家进一步鉴定是雀形目雀科家麻雀,该种为陕西省鸟类新纪录. 相似文献
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In 2 April 2012 a birdwatcher,Mr.Hong Guo,found a strange white bird near a garbage dump in Wuqia County,(39°55′N,75°15′E),at an elevation of 2100m.This location is approximately 80km west of Kaxgar.After experts checked the photographs,it was identified as an adult 相似文献
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2009年9月26日,笔者首次发现并救助1只来自蚌埠市怀远县的宝兴歌鸫(Turdus mupinensis)。2012年5月26日、6月2日、16日、22日、23日和2012年12月8日,相继在淮北市相山公园6次观察并拍摄到宝兴歌鸫1只,2013年6月22日和29日再次在同一地点观测到宝兴歌鸫1只。2012年10月19日在合肥市中国科学技术大学东区观察并拍摄到宝兴歌鸫1只。2013年11月6日协助市民在合肥市经开区住宅区救助1只受伤的宝兴歌鸫。2013年3月31日上午在六安市金寨县天堂寨也观察并拍摄到宝兴歌鸫1只。经查阅相关文献资料后证实,宝兴歌鸫为安徽省鸟类分布新记录。安徽发现宝兴歌鸫,对研究其地理分布和扩散趋势具有重要的学术意义。 相似文献
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对1968~2005年浙江蚕种出库资料进行了统计分析,提出了推广蚕品种的定义。在此期间浙江推广蚕品种有27对,其中主要推广品种14对。指出建国以来蚕品种更新经历了六个阶段。总结了蚕品种更新中经济性状的变化、季节布局的变化、品种来源的变化和更新周期等特点。回顾了浙江家蚕育种工作的进展,分析了推广秋种春养的原因,对蚕品种的选育目标,蚕品种的分类和如何加强育种工作提出了意见。 相似文献
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浙江蚕种业的改革与发展 总被引:2,自引:0,他引:2
本文总结了建国以来浙江省蚕种行业在生产规模、生产方式、蚕种产销管理办法、蚕种品牌、蚕种价格、蚕种场经营机制与体制以及蚕种标准、法规、行业管理方面所取得的改革成果。提出浙江蚕种业的发展方向是通过深化改革,确立蚕种场的企业地位、开展有序竞争、加强行业宏观管理,建立适应社会主义市场经济的蚕种产销体系。 相似文献
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《African Zoology》2013,48(2):228-239
Spatial and temporal patterns of disturbance and the subsequent heterogeneity are critical in maintaining biodiversity within grassland ecosystems. Grassland birds have evolved within this ‘shifting mosaic’ to become reliant on specific habitat characteristics maintained under varying levels of both natural and anthropogenic disturbance. Unfortunately, grasslands in South Africa have been extensively transformed and remain poorly conserved, threatening grassland avifauna. Mistbelt grassland is a threatened vegetation type endemic to the province of KwaZulu-Natal, of which only 0.3% is formally protected. This study investigated seasonal and patch type heterogeneity in a Mistbelt grassland avian community by determining avian community structure and composition in four patch types, i.e. i) untransformed open grassland, ii) burnt grassland, iii) bramble-invaded and, iv) bramble-cleared grassland, during winter and summer. Avian assemblages were significantly different between the different patch types for each season. The bramble patch type negatively affected grassland bird species diversity. Bramble-cleared grassland and untransformed grassland had similar vegetation structure and avian communities in the summer, suggesting that the grassland bird community benefitted soon after the clearing of invasive vegetation. This study provides further evidence that bird diversity is enhanced in structurally heterogeneous grassland landscapes. Furthermore, the protection and appropriate management of privately owned Mistbelt grassland, conserved in the form of rangeland, is an important refuge for threatened and endemic avifauna, such as the globally-threatened blue swallow (Hirundo atrocaerulea) and wattled crane (Bugeranus carunculatus). 相似文献