Rangeland Resources Assessment with Satellite Imagery: An Operational Tool for National Planning in Namibia

Ganzin, Nicolas; Coetzee, Marina; Rothauge, Axel; Fotsing, Jean-Marie

doi:10.1080/10106040508542353

Cited by 6 publications

(4 citation statements)

References 13 publications

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“…These species are sedentary and constrained in their movements by the location of water sources (Estes, ; Redfern et al ., ). We used the satellite‐derived normalized difference vegetation index (NDVI) as a proxy of vegetation productivity in the drawn circles (‘productivity’ effect) (Ganzin et al ., ). We used 10‐day NDVI images (resolution 1.2 × 1.2 km) derived from 1986 to 2008 from Advanced Very High Resolution Radiometer/National Oceanographic and Atmospheric Agency satellites.…”

Section: Methodsmentioning

confidence: 97%

Trophy hunting inAfrica: long‐term trends in antelope horn size

Crosmary

Loveridge

Ndaimani

et al. 2013

Animal Conservation

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Trophy hunting in ungulates may favour individuals with smaller horns. A decrease in horn/antler size may jeopardize the conservation potential of hunting areas, which would be a major concern in Africa where hunting zones represent over half of the total area of protected lands. We investigated horn length trends of harvested male impalas Aepyceros melampus, greater kudus Tragelaphus strepsiceros and sable antelopes Hippotragus niger, from 1974 to 2008 in Matetsi Safari Area, Zimbabwe. Horn length declined by 4% in impalas, partly because male harvest age decreased. In greater kudus, surprisingly, horn length increased by 14%, while mean age of harvested male greater kudus increased during the study period. Reduced hunting pressure on this species during the study may have allowed males to live longer and to grow longer horns before being harvested. Horn length declined by 6% in sable antelopes, independent of age, suggesting that trophy hunting selected male sable antelopes with smaller horns through time, provided that horn length is heritable. Hunting pressure and trophy value were higher for sable antelopes than for impalas and greater kudus. Accordingly, the decline of horn length in this species was more pronounced. More valuable trophy species, such as sable antelopes, require special attention because they may be exposed to higher hunting pressure, and are therefore more likely to experience a decrease in horn size. (Résumé d'auteur

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Section: Methodsmentioning

confidence: 97%

Trophy hunting inAfrica: long‐term trends in antelope horn size

Crosmary

Loveridge

Ndaimani

et al. 2013

Animal Conservation

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“…Some of these questions are at the heart of the debate regarding success criteria of land reform. These critical agricultural issues include for instance the evaluation of farm value [44] as the basis to assess equity (Figure 1) and the updating of the conventional concept of Zimbabwe's agro-ecological zones [45] as an improved mechanism to answer questions of economic viability (Figure 1).…”

Section: The Potential Of Remote Sensing To Contribute To the Researcmentioning

confidence: 99%

“Bring Back the Land”—A Call to Refocus on the Spatial Dimension of Zimbabwe’s Land Reform

Hentze

Menz

2015

Land

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Abstract:In this article, we argue that research on land reform in the nation of Zimbabwe has overlooked possibilities of integrating geospatial methods into analyses and, at the same time, geographers have not adequately developed techniques for this application. Scholars have generally been captured within the debate focused on the success or failure of the Zimbabwean land reform program, and have neglected to analyze what has occurred where during the process of "fast-track land reform". To date, no extensive national dataset of land ownership change, and the effect of this change on land use planning strategies, has been developed within the scientific community. As a result, most publications, even very detailed and thorough ones, have been based on regional case studies, broad estimates, or on outdated, cross-referenced statistics. To overcome the lack of spatio-temporal data, we propose an analytic framework to map Zimbabwe's fast-track land reform and its country-wide effects. It emphasizes the potential of geographic information systems and satellite remote sensing to provide an objective basis for future studies of the subject.

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“…The lack of information hampers the development of climate change adaptation strategies, informed forest management and land use planning decisions. The use of passive remote sensing offers only limited options because the spectral signal from the open forests is influenced by fire scars, shrub and grass cover, which all have a high intra-and inter-annual variability (FAO 2001;Ganzin et al 2005;De Cauwer 2015).…”

Section: Introductionmentioning

confidence: 99%

Patterns of forest composition and their long term environmental drivers in the tropical dry forest transition zone of southern Africa

et al. 2016

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Background: Tropical dry forests cover less than 13 % of the world's tropical forests and their area and biodiversity are declining. In southern Africa, the major threat is increasing population pressure, while drought caused by climate change is a potential threat in the drier transition zones to shrub land. Monitoring climate change impacts in these transition zones is difficult as there is inadequate information on forest composition to allow disentanglement from other environmental drivers. Methods: This study combined historical and modern forest inventories covering an area of 21,000 km 2 in a transition zone in Namibia and Angola to distinguish late succession tree communities, to understand their dependence on site factors, and to detect trends in the forest composition over the last 40 years.

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Rangeland Resources Assessment with Satellite Imagery: An Operational Tool for National Planning in Namibia

Cited by 6 publications

References 13 publications

Trophy hunting inAfrica: long‐term trends in antelope horn size

Trophy hunting inAfrica: long‐term trends in antelope horn size

“Bring Back the Land”—A Call to Refocus on the Spatial Dimension of Zimbabwe’s Land Reform

Patterns of forest composition and their long term environmental drivers in the tropical dry forest transition zone of southern Africa

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