Author: Martin Wegmann

new article in NATURE Scientific Reports

our new article in Nature Scientific Reports is out “Disentangling the relative effects of bushmeat availability on human nutrition in central Africa“. We linked wild meat availability and malnutrition in Central Africa. The spatial pattern of bushmeat extraction could be partially explained by environmental parameters and are about to be submitted in a separate article. abstract: We studied links between human malnutrition and wild meat availability within the Rainforest Biotic Zone in central Africa. We distinguished two distinct hunted mammalian diversity distributions, one in the rainforest areas (Deep Rainforest Diversity, DRD) containing taxa of lower hunting sustainability, the other...

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new article: Adding structure to land cover – using fractional cover to study animal habitat selection

our new article just got published online in “Movement Ecology” on the added value of fractional cover analysis using remote sensing data to explain spatio-temporal animal movement patterns. More in-depth analysis are needed to compare and evaluate the importance of different remote sensing derived parameters for this kind of analysis. Linking animal movements to landscape features is critical to identify factors that shape the spatial behaviour of animals. Habitat selection is led by behavioural decisions and is shaped by the environment, therefore the landscape is crucial for the analysis. Land cover classification based on ground survey and remote sensing data sets are an established approach to define landscapes for habitat selection analysis.We investigate an approach for analysing habitat use using continuous land cover information and spatial metrics. This approach uses a continuous representation of the landscape using percentage cover of a chosen land cover type instead of discrete classes. This approach, fractional cover, captures spatial heterogeneity within classes and is therefore capable to provide a more distinct representation of the landscape. The variation in home range sizes is analysed using fractional cover and spatial metrics in conjunction with mixed effect models on red deer position data in the Bohemian Forest, compared over multiple spatio?temporal scales. We analysed forest fractional cover and a texture metric within each home range showing that variance of fractional cover values and texture explain much...

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new article: Free and open-access satellite data are key to biodiversity conservation

Our new article just got published in Biological Conservation. It is based on various workshop outcomes organized by NASA/WCS, CEOS Biodiversity and others in the past 2 years. The free and open access policy for space borne earth observation is crucial for global biodiversity research and conservation.   Satellite remote sensing is an important tool for monitoring the status of biodiversity and associated environmental parameters, including certain elements of habitats. However, satellite data are currently underused within the biodiversity research and conservation communities. Three factors have significant impact on the utility of remote sensing data for tracking and understanding biodiversity change. They are its continuity, affordability, and access. Data continuity relates to the maintenance of long-term satellite data products. Such products promote knowledge of how biodiversity has changed over time and why. Data affordability arises from the cost of the imagery. New data policies promoting free and open access to government satellite imagery are expanding the use of certain imagery but the number of free and open data sets remains too limited. Data access addresses the ability of conservation biologists and biodiversity researchers to discover, retrieve, manipulate, and extract value from satellite imagery as well as link it with other types of information. Tools are rapidly improving access. Still, more cross-community interactions are necessary to strengthen ties between the biodiversity and remote sensing communities. W. Turner, C. Rondinini, N....

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new article: forest mapping in South-East Asia

our new article “Mapping threatened dry deciduousdipterocarpforest in South-east Asia for conservation management” by Christian Wohlfart, Martin Wegmann and Peter Leimgruber got just published. This article was a result of Christians MSc thesis which was conducted in cooperation with the Smithsonian Conservation Biology Institute (SCBI) within the Global Change Ecology MSc. study program. This study is highly valuable for ongoing research projects in the region and Peter is using it for explaining animal distributions. Habitat loss is the primary reason for species extinction, making habitat conservation a critical strategy for maintaining global biodiversity. Major habitat types , such as lowland tropical evergreen forests or mangrove forests, are already wellrepresented in many conservation priorities, while others are underrepresented. This is particularly true for dry deciduous dipterocarp forests (DDF), a key forest type in Asia that extends from the tropical to the subtropical regions in South-eastAsia (SE Asia), where high temperatures and pronounced seasonal precipitation patterns are predominant. DDF are a unique forest ecosystem type harboring a wide range of important and endemic species and need to be adequately represented in global biodiversity conservation strategies. One of the greatest challenges in DDF conservation is the lack of detailed and accurate maps of their distribution due to inaccurate open-canopy seasonal forest mapping methods. Conventional land cover maps therefore tend to perform inadequately with DDF. Our study accurately delineates DDF on a continental...

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new MSc: Asja Bernd

Asja Bernd started her MSc on ” A Global Analysis of Grassland Fragmentation” supervised by Neil Burgess (UNEP) and Martin Wegmann. She will use globally available land cover data sets and compute a variety of spatial metrics to derive the fragmentation pattern of grasslands. Methods available in R and GRASS will be applied to allow a semi-automatic global analysis. Asja is a student in the Global Change Ecology MSc program and well trained in journalism as well as natural...

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the Remote Sensing Department
at the University of Würzburg
Institute of Geography and Geology
Oswald Külpe Weg 86
97074 Würzburg

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