Martin Wegmann

Martin Wegmann
University of Wuerzburg | JMU · Division of Remote Sensing

PhD

About

159
Publications
86,420
Reads
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5,418
Citations
Introduction
Martin Wegmann, Remote Sensing for Biodiversity and Conservation, Department of Remote Sensing, Wuerzburg; CEOS Biodiversity at DLR, AniMove.org lecturer, assistant professor at the Global Change Ecology program www.remote-sensing.eu www.earth-observation.info www.animove.org www.remote-sensing-biodiversity.org
Additional affiliations
January 2006 - June 2016
University of Wuerzburg
Position
  • senior lecturer/reader/ass. prof./Akam Rat.
March 2005 - present
University of Wuerzburg
Position
  • x
January 2005 - December 2013
University of Wuerzburg

Publications

Publications (159)
Article
Monitoring global biodiversity from space through remotely sensing geospatial patterns has high potential to add to our knowledge acquired by field observation. Although a framework of essential biodiversity variables (EBVs) is emerging for monitoring biodiversity, its poor alignment with remote sensing products hinders interpolation between field...
Article
Full-text available
Forest systems provide crucial ecosystem functions to our environment, such as balancing carbon stocks and influencing the local, regional and global climate. A trend towards an increasing frequency of climate change induced extreme weather events, including drought, is hereby a major challenge for forest management. Within this context, the applic...
Article
In the light of unprecedented change in global biodiversity, real-time and accurate ecosystem and biodiversity assessments are becoming increasingly essential. Nevertheless, estimation of biodiversity using ecological field data can be difficult for several reasons. For instance, for very large areas, it is challenging to collect data that provide...
Article
Full-text available
Abstract 1. Ecosystem heterogeneity has been widely recognized as a key ecological feature, influencing several ecological functions, since it is strictly related to several ecological functions like diversity patterns and change, metapopulation dynamics, population connectivity, or gene flow. 2. In this paper, we present a new R package - rasterd...
Preprint
Ecosystem heterogeneity has been widely recognized as a key ecological feature, influencing several ecological functions, since it is strictly related to several ecological functions like diversity patterns and change, metapopulation dynamics, population connectivity, or gene flow. In this paper, we present a new R package - rasterdiv - to calculat...
Article
Full-text available
The monitoring of land cover and land use change is critical for assessing the provision of ecosystem services. One of the sources for long-term land cover change quantification is through the classification of historical and/or current maps. Little research has been done on historical maps using Object-Based Image Analysis (OBIA). This study appli...
Preprint
Full-text available
In the light of unprecedented change in global biodiversity, real-time and accurate ecosystem and biodiversity assessments are becoming increasingly essential. Nevertheless, estimation of biodiversity using ecological field data can be difficult for several reasons. For instance, for very large areas, it is challenging to collect data that provide...
Book
This is a book about how ecologists can integrate remote sensing and GIS in their research. It will allow readers to get started with the application of remote sensing and to understand its potential and limitations. Using practical examples, the book covers all necessary steps from planning field campaigns to deriving ecologically relevant informa...
Thesis
In developing countries, current urbanization trends are leading to the development of settlements in endangered areas. Due to the lack of space and favourable land prices, occupation takes place mainly on cities edges, which are often characterized by steep slopes and are therefore areas prone to landslides. This triggers an increase of both the e...
Article
Full-text available
1. Visualizing movement data is challenging: While traditional spatial data can be sufficiently displayed as two‐dimensional plots or maps, movement trajectories require the representation of time in a third dimension. To address this, we present moveVis, an R package, which provides tools to animate movement trajectories, overlaying simultaneous u...
Article
Full-text available
Habitat degradation and hunting have caused the widespread loss of larger vertebrate species (defaunation) from tropical biodiversity hotspots. However, these defaunation drivers impact vertebrate biodiversity in different ways and, therefore, require different conservation interventions. We conducted landscape-scale camera-trap surveys across six...
Article
Full-text available
Land cover is a key variable in monitoring applications and new processing technologies made deriving this information easier. Yet, classification algorithms remain dependent on samples collected on the field and field campaigns are limited by financial, infrastructural and political boundaries. Here, animal tracking data could be an asset. Looking...
Conference Paper
Many migratory species are facing increasing environmental and anthropogenic pressures. Important migration pathways and resting sites are gradually lost due to habitat degradation and transformation leading to reduced survival and poor reproductive success. Observations of dramatic declines in population size across taxa in conjunction with the un...
Article
Full-text available
1.Remote sensing data is a valuable tool in movement ecology. However, the way it's combined with animal movement data is far from optimal as most studies overlook differences in the spatial, temporal and thematic resolutions between both data types. 2.rsMove uses a pixel‐based approach to link animal tracking and remote sensing data that bridge th...
Article
Full-text available
The preservation of biodiversity has become a major challenge for sustainable development at national, European (Natura 2000 and Habitats Directive) and international levels (Convention on Biological Diversity, 2011-2020). To address the current conservation needs; there’s a need to operationalise methods to assess the distribution of natural resou...
Article
Full-text available
Forest ecosystems fulfill a whole host of ecosystem functions that are essential for life on our planet. However, an unprecedented level of anthropogenic influences is reducing the resilience and stability of our forest ecosystems as well as their ecosystem functions. The relationships between drivers, stress, and ecosystem functions in forest ecos...
Article
Full-text available
Forest ecosystems fulfill a whole host of ecosystem functions that are essential for life on our planet. However, an unprecedented level of anthropogenic influences is reducing the resilience and stability of our forest ecosystems as well as their ecosystem functions. The relationships between drivers, stress, and ecosystem functions in forest ecos...
Chapter
Synthesizing and properly visualizing data in 2D systems is a key issue when aiming at explaining spatial patterns by spatial processes. In this chapter we address the topics synthesis and visualization in relation to following ecological issues: (1) synthesizing species distribution models relying on virtual species, (2) visualizing spatial uncert...
Book
Full-text available
The preservation of biodiversity has become a major challenge for sustainable development at national, European (Natura 2000 and Habitats Directive) and international levels (Convention on Biological Diversity, 2011-2020). To address the current conservation needs, there is a need to operationalise methods to assess the distribution of natural reso...
Article
Full-text available
Optical remote sensing is an important tool in the study of animal behavior providing ecologists with the means to understand species-environment interactions in combination with animal movement data. However, differences in spatial and temporal resolution between movement and remote sensing data limit their direct assimilation. In this context, we...
Article
Full-text available
1. Biodiversity includes multiscalar and multitemporal structures and processes, with different levels of functional organization, from genetic to ecosystemic levels. One of the mostly used methods to infer biodiversity is based on taxonomic approaches and community ecology theories. However, gathering extensive data in the field is difficult due t...
Article
Assessing biodiversity from field-based data is difficult for a number of practical reasons: (i) establishing the total number of sampling units to be investigated and the sampling design (e.g. systematic random, stratified) can be difficult; (ii) the choice of the sampling design can affect the results; and (iii) defining the focal population of i...
Article
Full-text available
Understanding the drivers of Asian elephant (Elephas maximus) abundance and distribution is critical for effective elephant conservation, yet no such analysis exists despite decades of assessments and planning. We explored the influence of habitat- and governance-related drivers on elephant abundance across the 13 Asian elephant range countries. We...
Article
Full-text available
Societal, economic and scientific interests in knowing where biodiversity is, how it is faring and what can be done to efficiently mitigate further biodiversity loss and the associated loss of ecosystem services are at an all-time high. So far, however, biodiversity monitoring has primarily focused on structural and compositional features of ecosys...
Article
Analysing the changing spatial patterns of landscapes due to climate change or anthropogenic impact is important for various disciplines. Land cover change and its resulting modification of spatial patterns in the landscape influence various geographical or ecological parameters. Changing formerly continuous into discontinuous ecosystems due to lan...
Article
Full-text available
Transboundary cooperation is being promoted as an effective way to conserve biodiversity that straddles national borders. However, monitoring the ecological outcomes of these large-scale endeavours is challenging, and as a result, the factors and processes likely to shape their effectiveness remain poorly identified and understood. To address this...
Article
Remote sensing is one of the most important tools in ecology and conservation for an effective monitoring of ecosystems in space and time. Hence, a proper training is crucial for developing effective conservation practices based on remote sensing data. In this paper we aim to highlight the potential of open-access data and open-source software and...
Conference Paper
"Migratory species carry a special ecological role in that they connect biodiversity and ecosystem function across distant regions of our planet. Understanding and monitoring movement patterns and requirements of migratory species is of particular importance to fulfill monitoring and conservation obligations under international conventions and init...
Conference Paper
Forage availability during spring migration is crucial for the survival and successful reproduction of many migratory species. With careful timing in relation to spring growth and small-scale selection of suitable food sites, large avian herbivory migrants are known to maximise foraging rate during spring. However, especially for Arctic breeders, t...
Article
Full-text available
Évaluer le niveau de la diversité dans les communautés végétales à partir de données sur le terrain est difficile pour un certain nombre de raisons pratiques: (1) l'établissement du nombre d'unités d'échantillonnage à analyser peut être difficile; (2) le choix du plan d'échantillonnage peut avoir un impact sur les résultats; et (3) la définition de...
Article
Full-text available
Remote sensing (RS) has made significant contributions to conservation and ecology; however, direct use of RS-based information for conservation decision making is currently very limited. In this paper, we discuss the reasons and challenges associated with using RS technology by conservationists and suggest how training in RS for conservationists c...
Article
Full-text available
Most animals live in seasonal environments and experience very different conditions throughout the year. Behavioral strategies like migration, hibernation, and a life cycle adapted to the local seasonality help to cope with fluctuations in environmental conditions. Thus, how an individual utilizes the environment depends both on the current availab...
Article
Full-text available
The Group on Earth Observations Biodiversity Observation Network (GEO BON) is developing the Essential Biodiversity Variables (EBVs) as the key variables needed, on a regular and global basis, to understand and monitor changes in the Earth's biodiversity. A subset of these EBVs can be derived from space-based remote sensing, within this paper refer...
Presentation
”Movement is an essential variable in animal ecology. It provides crucial information on individual and collective behavior and is the basis for efficient conservation planning of e.g. migratory species. To fully understand movement it is essential to consider the underlying environmental conditions. Animal movements are strongly influenced by the...
Chapter
Protected areas act as refuges for species and ecological processes that cannot persist in intensely modified landscapes and seascapes and provide space for natural evolution and future ecological restoration. This chapter first highlights the range of opportunities existing for space-borne environmental information to support monitoring efforts of...
Article
Full-text available
Although satellite-based variables have for long been expected to be key components to a unified and global biodiversity monitoring strategy, a definitive and agreed list of these variables still remains elusive. The growth of interest in biodiversity variables observable from space has been partly underpinned by the development of the essential bi...
Article
Hunting and trade of wild animals for their meat (bushmeat), especially mammals, is commonplace in tropical forests worldwide. In West and Central Africa, bushmeat extraction has increased substantially during recent decades. Currently, such levels of hunting pose a major threat to native wildlife. In this paper, we compiled published data on hunti...
Chapter
Protected areas spearhead our response to the rapidly accelerating biodiversity crisis. However, while the number of protected areas has been growing rapidly over the past 20 years, the extent to which the world’s protected areas are effectively conserving species, ecosystems, and ecosystem services is poorly understood. Highlights new techniques...
Conference Paper
Forest ecosystems respond very sensitively to climate and atmospheric changes. Feedback mechanisms can be measured via changes in albedo, energy balance and carbon storage. The Bavarian Forest National Park is a unique forest ecosystem with large non-intervention zones, which promote a large scale re-wilding process with low human interference. It...
Conference Paper
Biodiversity analysis and conservation decision relies on adequate and meaningful data that are available on a long-term and global basis. Such environmental information need adequate spatial and temporal resolution and remote sensing data does provide a wide range of potentially suitable data sets. Various groups use remote sensing data but a biod...
Article
Hunting and trade of wild animals for their meat (bushmeat), especially mammals, is commonplace in tropical forests worldwide. In West and Central Africa, bushmeat extraction has increased substantially during recent decades. Currently, such levels of hunting pose a major threat to native wildlife. In this paper, we compiled published data on hunti...
Article
Full-text available
Schistosomiasis is a widespread water-based disease that puts close to 800 million people at risk of infection with more than 250 million infected, mainly in sub-Saharan Africa. Transmission is governed by the spatial distribution of specific freshwater snails that act as intermediate hosts and the frequency, duration and extent of human bodies exp...
Article
Full-text available
Schistosomiasis is a parasitic worm infection that is widespread in sub-Saharan Africa where people get in contact with open freshwater bodies. For many years, the strategy to control schistosomiasis was to prevent morbidity through deworming of school-aged children. Recently, transmission control has gained interest, which requires information whe...