Das Auerhuhn ist eine stark gefährdete Brutvogelart der Schweiz. Veränderungen in der Zusammensetzung und Nutzung des Waldes haben dazu geführt, dass sich die Bestände dieses Raufusshuhns in den letzten drei Jahrzehnten halbiert haben. Deshalb sollen die Lebensraumansprüche des attraktiven Waldvogels vermehrt in der Planung und Umsetzung von Waldreservaten und der Bewirtschaftung von Wäldern der höheren Lagen berücksichtigt werden. Auf der kleinen räumlichen Ebene sind die Habitatsansprüche der Art durch Untersuchungen in West- und Mitteleuropa (Storch 1993, 2002, Schroth 1994) und Skandinavien relativ gut bekannt. Dagegen werden die Populationsprozesse auf der Ebene der Landschaft erst in Ansätzen verstanden (Sjöberg 1996, Kurki 2000). Entsprechend konnte man die Bestandsrückgänge in den meisten Gebieten Europas noch nicht stoppen, da einerseits genauere Kenntnisse über das Zusammenspiel und die relative Bedeutung der einzelnen Faktoren fehlen (Habitatqualität, Störungen, Prädatoren, Witterung-Klima, Huftierkonkurrenz), und andererseits noch nicht versucht wurde, die Bestandsentwicklung im grossen landschaftlichen Massstab als Metapopulationsdynamik zu verstehen. Es ist das primäre Ziel dieses Projekts, ein räumlich explizites Metapopulationsmodell des Auerhuhns für einen grossen Landschaftsausschnitt der Schweizer Alpen zu erarbeiten. Dabei sollen die erwähnten Einflussfaktoren möglichst umfassend berücksichtigt werden. Die Arbeit soll modellhaft zeigen, dass für das Verständnis von Populationsvorgängen von raumbeanspruchenden Wildtierarten eine Analyse und Bewertung von lokal bis überregional wirksamen Einflussfaktoren notwendig sind. Die Ergebnisse sollen zudem als konzeptionelle Grundlage für den Nationalen Aktionsplan Auerhuhn und für regionale Artenförderungsprojekte dienen. Folgende Fragen und Themen sind für das Projekt von zentraler Bedeutung: Wie gross ist das landschaftsökologische Lebensraumpotenzial für das Auerhuhn in den Alpen, wie ist es räumlich verteilt? Wie verteilen sich die lokalen Auerhuhnpopulationen in diesen Potenzialgebieten? Wie gross sind die Bestände? Welche Faktoren beeinflussen den Status von Lokal- und Regionalpopulationen? Welche Populationen haben abgenommen oder sind verschwunden, welche sind stabil (Source-Sink-Mechanismen)? Zwischen welchen räumlich getrennten Populationen besteht ein Austausch? Welche Landschaftselemente wirken als Barrieren? Entwickeln einer nicht-invasiven Methode für die genetische Differenzierung von Populationen, sowie für Bestandsschätzungen und Monitoring.
The vegetation of East and South African savannahs has been shaped by the complex interaction of geo-biophysical processes and human impact. For both regions a controversial discussion is pertinent, as to whether massive degradation threatens the sustainability of livelihoods in these regions. Rangeland vegetation is mainly affected by environmental conditions (soil and climate) and by livestock management. Extent and interaction of these drivers are not well understood but have profound impacts on the resilience and vulnerability of these systems to be shifted toward unfavourable degraded or bush encroached states. The project aims to analyse and model rangeland vegetation in response to range management including livestock, soil quality and climatic conditions and to assess the impacts of changes in these conditions on the resilience and vulnerability of rangeland systems. Field measurements, remote sensing of vegetation patterns and dynamics and simulation modelling will be used to understand the dynamics of rangeland vegetation. We will use the 'fast' or 'state' variables potential of pastures to produce palatable biomass, the variability of this production, and the system's potential to recover from disturbance impact as indicators of resilience. 'slow' variables that control (or drive) the 'fast' variables such as management, climate and soil variables are recorded in cooperation with other subprojects as with A1 for soil variables. Results of the project will show which management activities are most favourable for individual regions to sustain plant production in the long term.
Traditional Indonesian homegardens harbour often high crop diversity, which appears to be an important basis for a sustainable food-first strategy. Crop pollination by insects is a key ecosystem service but threatened by agricultural intensification and land conversion. Gaps in knowledge of actual benefits from pollination services limit effective management planning. Using an integrative and agronomic framework for the assessment of functional pollination services, we will conduct ecological experiments and surveys in Central Sulawesi, Indonesia. We propose to study pollination services and net revenues of the locally important crop species cucumber, carrot, and eggplant in traditional homegardens in a forest distance gradient, which is hypothesized to affect bee community structure and diversity. We will assess pollination services and interactions with environmental variables limiting fruit maturation, based on pollination experiments in a split-plot design of the following factors: drought, nutrient deficiency, weed pressure, and herbivory. The overall goal of this project is the development of 'biodiversity-friendly' land-use management, balancing human and ecological needs for local smallholders.
Increasing population pressure is leading to unsustainable land use in North Vietnamese highlands and destruction of natural habitats. The resulting loss of biodiversity includes plant genetic resources - both wild (= non-cultivated) species and cultivated landraces - adapted to local conditions, and local knowledge concerning the plants. A particularly important group among endangered plants are the legumes (1) because Southeast Asia is a major centre of genetic diversity for this family, and (2) because the potential contribution of legumes to sustainable land use is, due to their multifunctionality (e.g., soil improvement, human and livestock nutrition), especially high. The project aims to contribute to the conservation and sustainable use of genetic resources of legumes with an integrated approach wherein a series of components are combined: (1) A participatory, indigenous knowledge survey complemented by information from the literature; (2) germplasm collection missions (for ex situ conservation) complemented by field evaluation and seed increase; (3) genetic diversity analysis of selected material by molecular markers; and (4) GIS based analysis of generated data to identify areas of particular genetic diversity as a basis for land area planning and in situ preservation recommendations. Project results are expected to be also applicable to similar highlands in Southeast Asia.
Forest structure is altered by humans for long times (Bramanti et al. 2009). The long lasting modification of forests pursuant to human demands modified the living conditions for birds as well as for many other animals. This included changes in resource availability (e.g., food, foraging, nesting sites) and changes of interspecific interactions, e.g., parasitism and predation (Knoke et al. 2009; Ellis et al. 2012). Also species compositions and the survivability of populations and even species are affected. The loss of foraging sites and suitable places for reproduction, the limitation of mobility due to fragmented habitats and the disturbances by humans itself may lead to more stressed individuals and less optimal living conditions. In certain cases species are not able to deal with the modified requirements and their populations will shrink and even vanish. Depending on the intensity of management and the remaining forest structure, biodiversity is more or less endangered. Especially in systems of two or more strongly connected taxa changing conditions that affect at least one part may subsequently affect the other, too. One system of interspecific communities that recently attracted the attention of biologists includes birds, blood parasites (haemosporidians) and their transmitting vectors. For instance, avian malaria (Plasmodium relictum) represents the reason for extreme declines in the avifauna of Hawaii since the introduction of respective vectors (e.g. Culicidae) during the 20th century (van Riper et al. 1986, Woodworth et al. 2005). With the current knowledge of this topic we are not able to predict if such incidences could also occur in Germany. All in all, different management strategies and intensity of forest management may influence the network of birds, vectors and blood parasites and change biodiversity. To elucidate this ecological complex, and to understand the interactions of the triad of songbirds as vertebrate hosts, dipteran vectors and haemosporidians within changing local conditions, I intend to collect data on the three taxa in differently managed forest areas, the given forest structure and the climatic conditions. I will try to explain the role of abiotic factors on infection dynamics, in detail the role of forest management intensity. Data acquisition takes place at three spatially divided locations: inside the Biodiversity Exploratory Schwäbische Alb, at the Mooswald in Freiburg, and inside the Schwarzwald.
Mountain regions provide goods and services for much of humanity. Twelve percent of the world's population lives in mountain regions and half of humanity depends on resources arising in mountain regions. Outside of the tropics, mountain regions provide 40Prozent of all the freshwater, and in arid and semi-arid regions, this fraction approaches 70-100Prozent. Mountains contain one quarter of Earth's terrestrial biodiversity and one half of the planet's biodiversity hot spots. Mountain forests and soils are among the major terrestrial carbon pools. Mountain ecosystems are very sensitive to drivers of change, from climate change to the loss of vegetation and soils due to inappropriate management practices and extractive industries. The future ability of mountain regions to provide their many goods and services to highland and lowland residents is seriously threatened by climatic changes, environmental pollution, unsustainable management of natural resources and serious gaps in understanding of mountain systems. Both fundamental research activities and transdisciplinary efforts are required to achieve sustainable use of mountain regions. While a number of regional or disciplinary programs exist, the global mountain research community has historically operated at a sub-optimal level due to insufficient communication across geographic and linguistic barriers, less than desirable coordination of research frameworks, and a lack of funding. The Mountain Research Initiative (MRI) was created to overcome these constraints by (1) framing research approaches within an interdisciplinary integrative framework; (2) improving communication to overcome the isolation of researchers separated by distance, language and discipline; and (3) influencing funding for global change research in mountain regions. The MRI supports the science needed to adapt successfully to global change by building on its successes to frame the research agenda, implement that agenda at a global and regional levels, integrate research results, provide key information services, improve communications and advocate for funding of global change research in mountains. With the support of several Swiss funding agencies, a small MRI Project Office was established in Bern in July 2001. It was funded at a more significant level by SNF in 2004. To conserve its limited resources, the MRI moved its main office to ETH Zürich in 2005 and also opened a small, free office at the University of Lausanne in order to reinforce contacts in French-speaking Switzerland. In 2007 MRI will move its main office to the University of Bern. Products will include articles in peer-reviewed journals, a scientifically focused Newsletter, an enhanced website, an expanded database of researchers and research programs, and innovative use of webcast and internet based communications.
In spite of a variety of efforts, tropical forests are still threatened by exploitation and conversion to agricultural land-use. Besides legal protection, sustainable management concepts are essential for stable conservation of these ecosystems. This project aims at identifying and optimizing the potentials for forest management for three different ecosystems (Dry Forest, Tropical Mountain Rain Forest, Paramo) along a height- and climate gradient in Southern Ecuador. Therefore, multiple and locally differentiated aspects of forest management have to be considered: the direct provision of goods (timber and non-timber forest products) as well as ecosystem services (carbon sequestration, water regulation), which are of increasing importance; moreover, the effects of forest management on biodiversity and the impacts of climate change on resilience indicators and the potential distribution of selected species with high potential for sustainable management or conservation should be investigated. First of all, the most important forest structure types and possible improvements of management alternatives have to be identified at the three sites for the assessment of different management concepts. The alternatives will be tested on experimental field plots and consequently monitored for their impacts on the locally most important criteria of forest management. A sound decision support tool will be developed, taking into account uncertainties with regard to input parameters and the relevance of different criteria of forest management. Therefore, Multi Criteria Decision Analysis will be used to generate locally adapted management concepts for the different ecosystems. Those concepts should be able to consider the multiple functions of forest management and will represent the forestry component in sustainable land-use models. The comprehensive studies will be carried out in close cooperation with other scientific teams from Germany and Ecuador as well as local institutions of relevance for forest management. The direct involvement of Ecuadorian students and young academics and the integration of the investigations in educational concepts will contribute to capacity building and local efforts for the enhancement of environmental competencies. Moreover, the experimental field plots will serve in parts as demonstration objects for the implementation of sustainable forest management concepts.
In Mecklenburg-Vorpommern ist der Bestand des Schwarzstorchs akut gefährdet. Nur noch wenige Areale kommen als Lebensraum für den Schwarzstorch im Nordosten von Deutschland infrage. Der Brutbestand sank in den letzten fünf Jahren alarmierend, von 16 Brutpaaren (BP) im Jahr 2009 auf 8 BP im Jahr 2013. Dies war Grund und Anlass, die Situation innerhalb der verbliebenen Schwarzstorch-Lebensräume in M-V mittels eines Forschungsprojektes intensiv zu analysieren. Spezielle Untersuchungen wurden vorgenommen, um praktikable Maßnahmen zur Stabilisierung und Verbesserung der Lebensraumsituation des Schwarzstorchs in M-V zu initiieren. In einem ersten Projektabschnitt wurde zunächst der aktuelle Zustand der Brut- und Nahrungsplätze im nähren Umkreis der Brutreviere untersucht. Dazu wurden vier spezielle Untersuchungsebenen festgelegt (Radius vom Nest bis 3 km). Neben einer umfassenden Analyse der Brut- und Nahrungsareale wurden ferner aktuelle anthropogene Störungen ausgewertet (am Brutplatz, z. B. Umsetzung gesetzlicher Nestschutz, Waldentwässerung, Windkraft). Für die jeweiligen Brutplätze sind dann zunächst die Hauptdefizite und Vorschläge für Schutzmaßnahmen erarbeitet worden. Es hat sich deutlich gezeigt, dass ein wesentliches Problem in den begrenzt verfügbaren Nahrungsquellen und deren Zustand liegt. Daher erfolgten im zweiten Projektabschnitt 2013 tiefgründige Analysen zum ökologischen Zustand der essentiellen Nahrungshabitate des Schwarzstorches. Sämtliche Defizite sind beispielgebend für ein Monitoringgebiet in Südwestmecklenburg (einem Kernbereich der Population) herausgearbeitet worden. Alle Ergebnisse des Projektes mündeten in konkrete Lösungs- und Maßnahmenvorschläge für die jeweiligen Brutplätze. Sie sind daher wichtige Instrumente für den praktischen Nestschutz und zugleich für die essentiellen Nahrungshabitate. Mit Hilfe der Ergebnisse dieses Forschungsprojektes können zielgerichtet die vorliegenden Maßnahmenvorschläge innerhalb der Schwarzstorchlebensräume bei entsprechender Bereitschaft und Motivation der Landnutzer umgesetzt werden. Entsprechende Fördergelder für die praktische Realisierung beschleunigen eine Umsetzung.
Natural populations are increasingly exposed to extreme environmental changes as a result of human activities. These changes threaten the existence of populations and cause strong natural selection at short time-scales. In the long term, the persistence of populations is determined by their capacity to respond to this selection via genetic adaptation. It is therefore crucial to understand how evolutionary processes influence the ability of populations to cope with the ongoing environmental changes. This project focuses on studying two major factors that influence the ability of populations to adapt to rapid environmental change: gene flow (movement of genes resulting from dispersal of individuals) and maternal effects (the effects of a mother's traits that, in addition to offspring's own genes, affect offspring performance), both of which have the potential to either impede or speed up adaptation. On this vein, the proposed research focuses in particular on understanding how gene flow and maternal effects affect the ability of populations to adapt to environmental changes. The main part of the research will be conducted on Swedish populations of the moor frog (Rana arvalis) that inhabit areas affected to different extents by human-induced acidification. The main questions to be targeted are i) to what extent is the level of local adaptation to acidification explained by variation in the extent of gene flow or variation in the strength of selection among populations, ii) how wide-spread are maternal effects as adaptations and iii) how is maternally determined local adaptation maintained in the face of gene flow? Because experimental manipulations are not possible in these natural populations, related questions will in parallel be addressed in a pilot study on laboratory populations of Daphnia. Here the main questions to be targeted are i) under which conditions does gene flow have positive vs. negative effects on adaptation to novel environments and ii) how do maternal effects influence the ability to respond genetically to rapid environmental changes? Different complementary approaches will be used in the different subprojects to allow rigorous inferences and predictions. The main methods to be used include large-scale geographic sampling (for environmental, molecular genetic, and phenotypic variation) and mark-recapture studies in nature, molecular and quantitative genetic analyses in the laboratory, and fitness assays in semi-natural and laboratory conditions. The results from this research will illustrate to what extent gene flow and maternal effects influence variation in the phenotypes that we see in nature, and how they can affect the ability of organisms to adapt to novel environments. Ultimately this research aims at understanding the short-term ecological and evolutionary processes that create, maintain and change biological diversity, and will be of broad significance for evolutionary biology as well as conservation biology.
Explaning the coexistence of many plant species in a given area is a central topic in plant ecology. The ultimate goal of the proposed project is a better understanding of this coexistence. Specifically, we would investigate a factor that very probable influences the coexistence of plant species and has not been tested experimentally so far: the resource transport and supply rates. It has been shown with computer simulations that this factor influences coexistence, but it has - to our knowledge - not been tested experimentally so far. Basically, it is expected that low resource transport rates combined with high resource input rates have a positive effect on coexistence between different plant species. This is because under those circumstances a given individual of one species can not lower the resource level around an individual of an other species below the level where that can survive. In our proposed study we will highlight these effects by experiments ranging from strongly reductionistic to more complex conditions. We will mainly focus on nutrients as a resource. Our overall hypothesis is: High transport coefficients of nutrients and low resource input fluxes can lead to competitive exclusion of plant species and thus to reduced local diversity. Besides its scientific significance, this topic has gained more and more interest from an applied perspective in recent years as biodiversity might be threatened by invasive species, elevated CO2, warming, nitrogen deposition, changing precipitation patterns, and other global change factors. A better understanding of mechanisms enabling plants to coexist is a prerequisite to predicting the influence of anticipated changes and for setting priorities for appropriate counteractions.
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