نتایج جستجو برای: 30642 km2

تعداد نتایج: 5297  

2014
Richard D. Pillans Douglas Bearham Andrew Boomer Ryan Downie Toby A. Patterson Damian P. Thomson Russel C. Babcock

Off the Ningaloo coast of North West Western Australia, Spangled Emperor Lethrinus nebulosus are among the most highly targeted recreational fish species. The Ningaloo Reef Marine Park comprises an area of 4,566 km2 of which 34% is protected from fishing by 18 no-take sanctuary zones ranging in size from 0.08-44.8 km2. To better understand Spangled Emperor movements and the adequacy of sanctuar...

Journal: :Remote Sensing 2016
Ting Ma Zhan Yin Baolin Li Chenghu Zhou Susan Haynie

Rapid urbanization with sizeable enhancements of urban population and built-up land in China creates challenging planning and management issues due to the complexity of both the urban development and the socioeconomic drivers of environmental change. Improved understanding of spatio-temporal characteristics of urbanization processes are increasingly important for investigating urban expansion a...

2004
MANUEL NOGALES AURELIO MARTÍN BERNIE R. TERSHY C. JOSH DONLAN

Feral cats are directly responsible for a large percentage of global extinctions, particularly on islands. We reviewed feral cat eradication programs with the intent of providing information for future island conservation actions. Most insular cat introductions date from the nineteenth and twentieth centuries, whereas successful eradication programs have been carried out in the last 30 years, m...

2017
Xi Chun Riguge Su Jiyao Liu Wenjun Liang Mei Yong Khkhuudei Ulambadrakh

The Qehan Lake Basin (QLB) and its system of lakes are located in a marginal monsoon zone and are extremely sensitive to global climate change. In this paper, using aerial photographs from different periods, in addition to MSS, TM, and ETM images, and combining these with regional topographic maps, we analyze lake area changes from 1958 to 2010 and the relation between Qehan Lake (QL) and clima...

2016
Chao Wang Qiong Gao Xian Wang Mei Yu

Uncovering magnitude, trend, and spatial pattern of land cover/land use changes (LCLUC) is crucial for understanding mechanisms of LCLUC and assisting land use planning and conservation. China has been undergoing unprecedented economic growth, massive rural-to-urban migration, and large-scale policy-driven ecological restoration, and therefore encountering enormous LCLUC in recent decades. Howe...

Journal: :Remote Sensing 2017
Qiang Guo Bihong Fu Pilong Shi Thomas Cudahy Jing Zhang Huan Xu

The Ordos Plateau, a typical semi-arid area in northern China, has experienced severe wind erosion events that have stripped the agriculturally important finer fraction of the topsoil and caused dust events that often impact the air quality in northern China and the surrounding regions. Both climate change and human activities have been considered key factors in the desertification process. Thi...

Journal: :Ambio 2007
Timothy J Killeen Veronica Calderon Liliana Soria Belem Quezada Marc K Steininger Grady Harper Luis A Solórzano Compton J Tucker

Land-cover change in eastern lowland Bolivia was documented using Landsat images from five epochs for all landscapes situated below the montane tree line at approximately 3000 m, including humid forest, inundated forest, seasonally dry forest, and cloud forest, as well as scrublands and grasslands. Deforestation in eastern Bolivia in 2004 covered 45,411 km2, representing approximately 9% of the...

Journal: :Geospatial health 2015
Vreni Jean-Richard Lisa Crump Abbani Alhadj Abicho Ali Abba Abakar Abdraman Mahamat Mahamat Bechir Sandra Eckert Matthias Engesser Esther Schelling Jakob Zinsstag

Mobile pastoralists provide major contributions to the gross domestic product in Chad, but little information is available regarding their demography. The Lake Chad area population is increasing, resulting in competition for scarce land and water resources. For the first time, the density of people and animals from mobile and sedentary populations was assessed using randomly defined sampling ar...

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