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马拉维Nyika高原三种溪流鱼类的生境类型(英文) 被引量:2
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作者 Wilbert T. KADYE Ngonidzashe A. G. MOYO +1 位作者 Christopher H. D.MAGADZA Shakkie KATIVU 《动物学报》 SCIE CAS CSCD 北大核心 2008年第1期67-76,共10页
本研究调查了生活在非洲马拉维北部Nyika高原三种溪流鱼类的栖息地。分3个时期选择3条河流的24个地点进行取样,每个样点长100 m左右;分急流和回水湾两种生境类型作为独立的栖息地单元取样,据此观察研究对象和物理环境间的关系;用喜好指... 本研究调查了生活在非洲马拉维北部Nyika高原三种溪流鱼类的栖息地。分3个时期选择3条河流的24个地点进行取样,每个样点长100 m左右;分急流和回水湾两种生境类型作为独立的栖息地单元取样,据此观察研究对象和物理环境间的关系;用喜好指数和逻辑回归分析每种鱼重要栖息地是否稳定。瞻星平鳍鲇(Amphilius uranoscopus)通常喜欢生活在水深小于50 cm、流速0·4 -1 m/s的缓流河段,这里水色较深,河底多卵石。黄鱼(Labeobarbus johnstonii)常被发现在水深大于50 cm的河段,河水流速中等或较急。引入种虹鳟(Oncorhynchus mykiss)的活动范围常局限在水温低于20℃的河段,这些河段水深中等,流速较快,沿河多植物。虹鳟栖息地与土著种相似,可能与同域分布的土著种,特别是与广泛分布的瞻星平鳍鲇存在生存竞争。 展开更多
关键词 溪流鱼类 生境 生存竞争 nyika高原 马拉维
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Environmental Impacts of Invasive Alien Plant Species on the Biodiversity of the Nyika National Park, Rumphi District, Malawi
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作者 Robert D. Kacheche Maureen Kapute Mzuza 《American Journal of Plant Sciences》 2021年第10期1503-1514,共12页
Invasive alien plant species have threatened the integrity of ecosystems and threatened biological integrity throughout the world. In the Nyika National Park, a number of alien invasive plant species have been reporte... Invasive alien plant species have threatened the integrity of ecosystems and threatened biological integrity throughout the world. In the Nyika National Park, a number of alien invasive plant species have been reported. These invasive alien plants are reported to be very difficult that have caused adverse ecological, economic and social impact. The main objective of this study is to assess the environmental impact of plant invasive alien species in Nyika National Park in order to ascertain means of addressing the possible effects on the biodiversity. This study adopted an exploratory stance in order to answer <span>the hypotheses where purposive and simple random sampling was used. P</span>ur<span>posive sampling was only used to the staff of Nyika while simple random s</span>ampling was used to collect data from households surrounding Nyika National Park. The results revealed that invasive alien plant species have some ecological impacts of on the biodiversity of the Nyika National Park like change in physical habitats such as loss of native habitats, alteration of ground water regime, drying of rivers, loss of native species and alteration of biomass. The study would therefore be important to policy makers in guiding and devel<span>opment of policies and guidelines governing eradication of invasive alien pl</span>ant species. The Department of National Parks and Wildlife (DNPW) can form partnership with various stakeholders with a clearly stated intention of developing a relationship, based on collaboration to enhance the control of invading alien plant species and the best management practices. 展开更多
关键词 Invasive Alien Species BIODIVERSITY HABITAT Native Species nyika National Park
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