Wiegand, Kerstin

[["dc.bibliographiccitation.artnumber","e0190506"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","PLOS ONE"],["dc.bibliographiccitation.volume","13"],["dc.contributor.author","Dislich, Claudia"],["dc.contributor.author","Hettig, Elisabeth"],["dc.contributor.author","Salecker, Jan"],["dc.contributor.author","Heinonen, Johannes"],["dc.contributor.author","Lay, Jann"],["dc.contributor.author","Meyer, Katrin M."],["dc.contributor.author","Wiegand, Kerstin"],["dc.contributor.author","Tarigan, Suria"],["dc.date.accessioned","2019-07-09T11:45:08Z"],["dc.date.available","2019-07-09T11:45:08Z"],["dc.date.issued","2018"],["dc.description.abstract","Land-use changes have dramatically transformed tropical landscapes. We describe an ecological-economic land-use change model as an integrated, exploratory tool used to analyze how tropical land-use change affects ecological and socio-economic functions. The model analysis seeks to determine what kind of landscape mosaic can improve the ensemble of ecosystem functioning, biodiversity, and economic benefit based on the synergies and trade-offs that we have to account for. More specifically, (1) how do specific ecosystem functions, such as carbon storage, and economic functions, such as household consumption, relate to each other? (2) How do external factors, such as the output prices of crops, affect these relationships? (3) How do these relationships change when production inefficiency differs between smallholder farmers and learning is incorporated? We initialize the ecological-economic model with artificially generated land-use maps parameterized to our study region. The economic sub-model simulates smallholder land-use management decisions based on a profit maximization assumption. Each household determines factor inputs for all household fields and decides on land-use change based on available wealth. The ecological sub-model includes a simple account of carbon sequestration in above-ground and below-ground vegetation. We demonstrate model capabilities with results on household consumption and carbon sequestration from different output price and farming efficiency scenarios. The overall results reveal complex interactions between the economic and ecological spheres. For instance, model scenarios with heterogeneous crop-specific household productivity reveal a comparatively high inertia of land-use change. Our model analysis even shows such an increased temporal stability in landscape composition and carbon stocks of the agricultural area under dynamic price trends. These findings underline the utility of ecological-economic models, such as ours, to act as exploratory tools which can advance our understanding of the mechanisms underlying the trade-offs and synergies of ecological and economic functions in tropical landscapes."],["dc.identifier.doi","10.1371/journal.pone.0190506"],["dc.identifier.pmid","29351290"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/15038"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/59163"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.relation","SFB 990: Ökologische und sozioökonomische Funktionen tropischer Tieflandregenwald-Transformationssysteme (Sumatra, Indonesien)"],["dc.relation","SFB 990 | B | B10: Landschaftsbezogene Bewertung der ökologischen und sozioökonomischen Funktionen von Regenwald- Transformationssystemen in Sumatra (Indonesien)"],["dc.relation.issn","1932-6203"],["dc.relation.orgunit","Abteilung Ökosystemmodellierung"],["dc.relation.orgunit","Zentrum für Biodiversität und Nachhaltige Landnutzung"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0/"],["dc.subject.ddc","570"],["dc.subject.gro","sfb990_journalarticles"],["dc.subject.mesh","Arecaceae"],["dc.subject.mesh","Carbon Sequestration"],["dc.subject.mesh","Conservation of Natural Resources"],["dc.subject.mesh","Crops, Agricultural"],["dc.subject.mesh","Ecosystem"],["dc.subject.mesh","Models, Theoretical"],["dc.subject.mesh","Palm Oil"],["dc.subject.mesh","Tropical Climate"],["dc.title","Land-use change in oil palm dominated tropical landscapes-An agent-based model to explore ecological and socio-economic trade-offs."],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","52"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","The Open Ecology Journal"],["dc.bibliographiccitation.lastpage","61"],["dc.bibliographiccitation.volume","2"],["dc.contributor.author","Visser, Ute"],["dc.contributor.author","Wiegand, Kerstin"],["dc.contributor.author","Grimm, Volker"],["dc.contributor.author","Johst, Karin"],["dc.date.accessioned","2017-09-07T11:44:34Z"],["dc.date.available","2017-09-07T11:44:34Z"],["dc.date.issued","2009"],["dc.description.abstract","In the context of agricultural landscapes, conservation biocontrol practitioners attempt to secure and enhance the presence and effectiveness of natural enemies of insect pest species, for example parasitoids. Conservation biocontrol aims at maximizing both parasitoid persistence and parasitation rate. It is, however, still poorly understood how the amount, fragmentation and isolation of non-crop habitat of the host and its parasitoid affect persistence and parasitation rate. We developed a spatially explicit simulation model of a host and its specialized parasitoid and simulated thei3 spatiotemporal population dynamics in virtual landscapes. We found that the total habitat amount in the landscape modulates the impact of fragmentation on parasitoid persistence. If habitat is abundant, parasitoid persistence decreases with fragmentation, whereas if habitat is scarce, persistence is highest at intermediate levels of fragmentation. In any case, persistence is best for intermediate levels of isolation. Parasitation rate, on the other hand, is negatively influenced by fragmentation and isolation regardless of the habitat amount. Our results suggest that in landscapes with abundant habitat, both parasitation rates and parasitoid persistence can be increased by arranging habitat to be as clumped as possible. However, if habitat is scarce, landscape management can optimize either parasitation rates or parasitoid persistence but not both simultaneously."],["dc.identifier.doi","10.2174/1874213000902010052"],["dc.identifier.gro","3148927"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/5859"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/5568"],["dc.language.iso","en"],["dc.notes.intern","Wiegand Crossref Import"],["dc.notes.status","public"],["dc.notes.submitter","chake"],["dc.relation.issn","1874-2130"],["dc.relation.orgunit","Abteilung Ökosystemmodellierung"],["dc.rights","Goescholar"],["dc.rights.access","openAccess"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.subject","Heterogeneous landscape; agricultural landscape; habitat isolation; fragmentation; parasitoids; insect pest species; parasitation rate; parasitoid persistence; conservation biological control; landscape management"],["dc.subject.ddc","570"],["dc.subject.gro","agricultural landscape"],["dc.subject.gro","conservation biological control"],["dc.subject.gro","fragmentation"],["dc.subject.gro","habitat isolation"],["dc.subject.gro","heterogeneous landscape"],["dc.subject.gro","insect pest species"],["dc.subject.gro","landscape management"],["dc.subject.gro","parasitation rate"],["dc.subject.gro","parasitoid persistence"],["dc.subject.gro","parasitoids"],["dc.title","Conservation Biocontrol in Fragmented Landscapes: Persistence and Parasitation in a Host-Parasitoid Model"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","no"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","e02620"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Ecosphere"],["dc.bibliographiccitation.volume","10"],["dc.contributor.author","Getzin, Stephan"],["dc.contributor.author","Yizhaq, Hezi"],["dc.contributor.author","Muñoz-Rojas, Miriam"],["dc.contributor.author","Wiegand, Kerstin"],["dc.contributor.author","Erickson, Todd E."],["dc.date.accessioned","2019-07-09T11:50:12Z"],["dc.date.available","2019-07-09T11:50:12Z"],["dc.date.issued","2019"],["dc.description.abstract","Fairy circles (FCs) are extremely ordered round patches of bare soil within arid grasslands of southwestern Africa and northwestern Australia. Their origin is disputed because biotic factors such as insects or abiotic factors such as edaphic and eco-hydrological feedback mechanisms have been suggested to be causal. In this research, we used a multi-scale approach to shed light on the origin of Australian FCs. At a local scale, we investigated the potential cause of FCs using analyses of soil compaction and texture within FCs, the surrounding matrix vegetation, and in nearby large bare-soil areas. We found that soil hardness and clay content were similarly higher inside the FCs and in the large bare-soil areas. When compared to the matrix soils with protective grass cover, the 2.6–2.8 times higher clay content in FCs and large bare-soil areas is likely sourced via multiple abiotic weathering processes. Intense rainfall events, particle dispersion, surface heat, evaporation, and mechanical crust building inhibit plant growth in both areas. At the landscape scale, a systematic survey of 154 soil excavations within FCs was undertaken to evaluate the presence of pavement termitaria that could inhibit plant growth. We show that in up to 100% and most of the excavations per plot, no hard pavement termitaria were present in the FCs. This fact is substantiated by the observation that small, newly forming FCs are initiated on soft sand without evidence of termite activity. At the regional scale, we investigated the spatial properties of FCs and common termite-created gaps in Western Australia, using spatially explicit statistics. We mapped three 25-ha FC plots with a drone and compared them with three aerial images of typical vegetation gaps created by harvester and spinifex termites. We demonstrate that the small diameters, the lower ordering, and the heterogeneous patterns of these common termite gaps strongly differ from the unique spatial signature of FCs. Our multi-scale approach emphasizes that FCs are not trivial termite gaps and that partial correlation with termites at some sites does not imply causation. Instead, we highlight the need to study the edaphic and ecohydrological drivers of vegetation-pattern formation in water-limited environments."],["dc.identifier.doi","10.1002/ecs2.2620"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/15879"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/59720"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.relation.issn","2150-8925"],["dc.relation.orgunit","Abteilung Ökosystemmodellierung"],["dc.rights","CC BY 3.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/3.0"],["dc.subject.ddc","570"],["dc.subject.gro","clay crust"],["dc.subject.gro","cyclone"],["dc.subject.gro","emergent vegetation patterns"],["dc.subject.gro","heterogeneity"],["dc.subject.gro","hydrology"],["dc.subject.gro","nearest-neighbor distance"],["dc.subject.gro","pair-correlation function"],["dc.subject.gro","spatial periodicity"],["dc.subject.gro","Triodia basedowii"],["dc.subject.gro","vegetation self-organization"],["dc.subject.gro","wavelength"],["dc.subject.gro","weathering"],["dc.title","A multi-scale study of Australian fairy circles using soil excavations and drone-based image analysis"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]