Wiegand, Kerstin

[["dc.bibliographiccitation.firstpage","212"],["dc.bibliographiccitation.journal","Biological Conservation"],["dc.bibliographiccitation.lastpage","220"],["dc.bibliographiccitation.volume","166"],["dc.contributor.author","Goßner, Martin M."],["dc.contributor.author","Getzin, Stephan"],["dc.contributor.author","Lange, Markus"],["dc.contributor.author","Pašalić, Esther"],["dc.contributor.author","Türke, Manfred"],["dc.contributor.author","Wiegand, Kerstin"],["dc.contributor.author","Weisser, Wolfgang W."],["dc.date.accessioned","2017-09-07T11:52:22Z"],["dc.date.available","2017-09-07T11:52:22Z"],["dc.date.issued","2013"],["dc.description.abstract","The importance of spatial scale for β-diversity has been shown in several studies, but it is unclear how spatial diversity patterns correlate among different organismic groups. We studied spatial diversity organization of plants and several trophic guilds of beetles in beech-dominated forests in two regions of Germany to test whether different trophic guilds are organized independently in space. We applied multiplicative diversity partitioning using a nested hierarchical design of four increasingly broader spatial levels (subplot, plot, forest class, region) and tested for correlations among trophic guilds by using Pearson product moment correlations and Mantel-tests. We observed similar general diversity patterns at different trophic guilds showing a high contribution of β-diversity to total γ-diversity and found β-diversity to be higher at different spatial scales and α-diversity to be lower than expected by random distributions of individuals. Results, however, partly depended on the weighting of rare and abundant species. Beta-diversity in our study was caused mainly by species spatial turnover rather than by nestedness. Correlations of α-diversity between trophic guilds were low whereas correlations of β-diversity above subplot level were high. Importantly, more strongly connected trophic guilds revealed not generally stronger relationships than less strongly connected guilds. Three important implications for conservation can be deduced from our results: (1) heterogeneity of beech forests at different spatial scales should be supported in conservation strategies to enhance biodiversity and related functions; (2) the observed high importance of spatial turnover in relation to nestedness implies a concentration of conservation efforts to a large number of not necessarily the richest sites, and (3) recommendation for particular conservation strategies (e.g. selection of priority sites for conservation at regional scale) based on single indicator taxa or functional guild is difficult because of the varied response of the species in our study."],["dc.identifier.doi","10.1016/j.biocon.2013.06.033"],["dc.identifier.gro","3148909"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/5547"],["dc.language.iso","en"],["dc.notes.intern","Wiegand Crossref Import"],["dc.notes.status","final"],["dc.notes.submitter","chake"],["dc.relation.issn","0006-3207"],["dc.relation.orgunit","Abteilung Ökosystemmodellierung"],["dc.subject.gro","Beetles"],["dc.subject.gro","Ecosystem function"],["dc.subject.gro","Multiplicative diversity partitioning"],["dc.subject.gro","Q-Metric"],["dc.subject.gro","Spatial scale"],["dc.subject.gro","Species turnover"],["dc.title","The importance of heterogeneity revisited from a multiscale and multitaxa approach"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","no"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","149"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Journal of Ecology"],["dc.bibliographiccitation.lastpage","160"],["dc.bibliographiccitation.volume","101"],["dc.contributor.author","Punchi-Manage, Ruwan"],["dc.contributor.author","Getzin, Stephan"],["dc.contributor.author","Wiegand, Thorsten"],["dc.contributor.author","Kanagaraj, Rajapandian"],["dc.contributor.author","Savitri Gunatilleke, C. V."],["dc.contributor.author","Nimal Gunatilleke, I. A. U."],["dc.contributor.author","Wiegand, Kerstin"],["dc.contributor.author","Huth, Andreas"],["dc.date.accessioned","2017-09-07T11:52:22Z"],["dc.date.available","2017-09-07T11:52:22Z"],["dc.date.issued","2013"],["dc.description.abstract","One of the primary goals in community ecology is to determine the relative importance of processes and mechanisms that control biodiversity. Here, we examined habitat-driven species assemblages and species distribution patterns as well as their temporal variations for three life stages of two censuses of a 25-ha mixed dipterocarp forest at Sinharaja (Sri Lanka). Our general objective was to find out whether the species assemblages and associated habitat types changed with life stage, spatial scale and species attributes. We also analyse whether the habitat types were related to certain indicator species. Habitat types were determined with multivariate regression tree analyses driven by topographic variables. We found species assemblages associated with five distinct habitat types that appeared consistently for all life stages of the two censuses. These habitats were related to ridge-valley gradients and a pronounced contrast in south-west versus north-east aspect. Habitat-driven structuring was weak at the recruit stage but strong in the juvenile and adult stages. The species assemblage variance explained by topographic variables for different life stages ranged between 10{\\%} for recruits and 23{\\%} for juveniles. The species assemblages determined for different spatial scales (10, 20, 50 m) showed similar habitat partitioning, but the variance explained by the topographic variables increased in all life stages with spatial scale. This could be due to the homogenizing effect of topographic variables at the larger scales and unaccounted environmental variation at the smaller scales. The number of indicator species identified in the two censuses was higher in the juvenile stage than in the adult stage, and nearly all indicator species in the adult stage were also indicator species in the juvenile stage. Synthesis. Our study showed that approximately 75{\\%} of the variance in local species composition is unexplained. This may be due to spatially structured processes such as dispersal limitation, unaccounted biotic and abiotic environmental variables, and stochastic effects, but only 25{\\%} were due to topographic habitat association. Although the pronounced ridge-valley gradient and contrast of south-west versus north-east aspect created consistent habitats, our results suggest that local species assemblages at Sinharaja forest are jointly shaped by neutral and niche processes."],["dc.identifier.doi","10.1111/1365-2745.12017"],["dc.identifier.gro","3148900"],["dc.identifier.pmid","24669731"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/5537"],["dc.language.iso","en"],["dc.notes.intern","Wiegand Crossref Import"],["dc.notes.status","final"],["dc.notes.submitter","chake"],["dc.relation.issn","0022-0477"],["dc.relation.orgunit","Abteilung Ökosystemmodellierung"],["dc.subject.gro","Determinants of plant community diversity and stru"],["dc.subject.gro","Dispersal limitation"],["dc.subject.gro","Habitat association"],["dc.subject.gro","Indicator species"],["dc.subject.gro","Multivariate regression tree"],["dc.subject.gro","Neutral theory"],["dc.subject.gro","Sinharaja forest"],["dc.subject.gro","Spatial scale"],["dc.subject.gro","Topography"],["dc.title","Effects of topography on structuring local species assemblages in a Sri Lankan mixed dipterocarp forest"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","no"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","376"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Ecology"],["dc.bibliographiccitation.lastpage","386"],["dc.bibliographiccitation.volume","95"],["dc.contributor.author","Punchi-Manage, Ruwan"],["dc.contributor.author","Wiegand, Thorsten"],["dc.contributor.author","Wiegand, Kerstin"],["dc.contributor.author","Getzin, Stephan"],["dc.contributor.author","Gunatilleke, C. V. Savitri"],["dc.contributor.author","Gunatilleke, I. A. U. Nimal"],["dc.date.accessioned","2017-09-07T11:52:23Z"],["dc.date.available","2017-09-07T11:52:23Z"],["dc.date.issued","2014"],["dc.description.abstract","Niche and neutral theories emphasize different processes that contribute to the maintenance of species diversity and should leave different spatial structures in species assemblages. In this study we used variation partitioning in combination with distance‐based Moran's eigenvector maps and habitat variables to determine the relative importance of the effects of pure habitat, pure spatial, and spatially structured habitat processes on the spatial distribution of tree species composition and richness in a 25‐ha tropical rain forest of Sinharaja/Sri Lanka. We analyzed the contribution of those components at three spatial scales (10 m, 20 m, and 50 m) for all trees and the three life stages: recruits, juveniles, and adults. At the 10‐m scale, 80% of the variation in species composition remained unexplained for recruits and adults, but only 55% for juveniles. With increasingly broader scales these figures were strongly reduced, mainly by an increasing contribution of the spatially structured habitat component, which explained 4–30%, 20–47%, and 8–35% of variation in species composition for recruits, juveniles, and adults, respectively. The pure spatial component was most important at the 20‐m scale and reached 20%, 32%, and 23% for recruits, juveniles, and adults, respectively. The spatially structured habitat component described variability at broader scales than the pure spatial component. Our results suggest that stochastic processes and spatially structuring processes of community dynamics, such as dispersal limitation and habitat association, contributed jointly to explain species composition and richness at the Sinharaja forest, but their relative importance changed with scale and life stage. Species assembly at the local scale was more strongly impacted by stochasticity, whereas the signal of habitat was stronger at the 50‐m scale where plant‐scale stochasticity is averaged out. Recent research points to an emerging consensus on the relative contribution of stochasticity, habitat, and spatial processes in governing community assembly, but how these components change with life stage, and how this is influenced by sample size, remains to be explored."],["dc.identifier.doi","10.1890/12-2102.1"],["dc.identifier.gro","3148904"],["dc.identifier.pmid","24669731"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/5541"],["dc.language.iso","en"],["dc.notes.intern","Wiegand Crossref Import"],["dc.notes.status","final"],["dc.notes.submitter","chake"],["dc.relation.issn","0012-9658"],["dc.relation.orgunit","Abteilung Ökosystemmodellierung"],["dc.subject.gro","Distance-based Moran's eigenvector maps"],["dc.subject.gro","Neutral theory"],["dc.subject.gro","Niche theory"],["dc.subject.gro","Sinharaja forest"],["dc.subject.gro","Spatial scale"],["dc.subject.gro","Species composition and richness"],["dc.subject.gro","Sri Lanka"],["dc.subject.gro","Variation partitioning"],["dc.title","Effect of spatial processes and topography on structuring species assemblages in a Sri Lankan dipterocarp forest"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","no"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","2478"],["dc.bibliographiccitation.issue","7"],["dc.bibliographiccitation.journal","Forest Ecology and Management"],["dc.bibliographiccitation.lastpage","2485"],["dc.bibliographiccitation.volume","255"],["dc.contributor.author","Getzin, Stephan"],["dc.contributor.author","Wiegand, Kerstin"],["dc.contributor.author","Schumacher, Jens"],["dc.contributor.author","Gougeon, François A."],["dc.date.accessioned","2017-09-07T11:52:25Z"],["dc.date.available","2017-09-07T11:52:25Z"],["dc.date.issued","2008"],["dc.description.abstract","The detection and quantification of competition at the stand level is important in forest management because competition reduces growth and increases the risk of mortality. This is of interest for timber production where efficient tools of forest inventory are increasingly demanded. Especially modern planning of thinning based on aerial or satellite images requires a deeper and spatially explicit understanding of the growth dynamics of tree crowns relative to the dynamics of stems. Past studies have evaluated competition in forests with scale-dependent correlation functions applied to tree-size attributes (continuous marks) such as diameter at breast height (DBH) or tree height. Despite the fast reaction of foliage to changes of neighborhood density in the canopy, horizontal crown extent has apparently not been used in such competition analyses of marked point patterns. Here we investigated in a spatially explicit approach the formation of crown-size patterns under neighborhood competition. We also compared how mutual growth reduction in reaction to competition differs between crown extent and stem diameters. This response of tree-size attributes to competition was analyzed with the scale-dependent mark-correlation function (MCF) applied to the marks 'DBH', 'crown area' of all live trees, and 'upper crown area' of overstory trees. These analyses were conducted for two deciduous and two coniferous forests in central Germany. Unlike stem diameters, crown areas were very sensitive for the detection of competition in stands. In relation to 'crown area' of all trees in a plot, this sensitivity was greater when only the mark 'upper crown area' of overstory trees was analyzed because both the strength and the spatial range of negative size correlation increased. Upper crown areas showed a finite range of negative interaction of about 6 m. These results demonstrate that (1) the 'functional growing space' of large and light-exposed canopy trees is highly suitable to detect competition and (2) the spatial range and strength of competition can be assessed and differentiated between stands in a spatially explicit manner. Our application may have practical value for monitoring competition based on remotely sensed forest inventory because upper crown areas as seen by the 'bird-eye's view' were most sensitive for detecting competition in stands. {\\textcopyright} 2008 Elsevier B.V. All rights reserved."],["dc.identifier.doi","10.1016/j.foreco.2008.01.007"],["dc.identifier.gro","3148915"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/5553"],["dc.language.iso","en"],["dc.notes.intern","Wiegand Crossref Import"],["dc.notes.status","public"],["dc.notes.submitter","chake"],["dc.relation.issn","0378-1127"],["dc.relation.orgunit","Abteilung Ökosystemmodellierung"],["dc.subject.gro","Competition"],["dc.subject.gro","Crown area"],["dc.subject.gro","Douglas-fir"],["dc.subject.gro","Mark-correlation function"],["dc.subject.gro","Remote sensing"],["dc.subject.gro","Spatial scale"],["dc.title","Scale-dependent competition at the stand level assessed from crown areas"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","no"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1823"],["dc.bibliographiccitation.issue","7"],["dc.bibliographiccitation.journal","Ecology"],["dc.bibliographiccitation.lastpage","1834"],["dc.bibliographiccitation.volume","96"],["dc.contributor.author","Punchi-Manage, Ruwan"],["dc.contributor.author","Wiegand, Thorsten"],["dc.contributor.author","Wiegand, Kerstin"],["dc.contributor.author","Getzin, Stephan"],["dc.contributor.author","Huth, Andreas"],["dc.contributor.author","Gunatilleke, C. V. Savitri"],["dc.contributor.author","Gunatilleke, I. A. U. Nimal"],["dc.date.accessioned","2017-09-07T11:52:23Z"],["dc.date.available","2017-09-07T11:52:23Z"],["dc.date.issued","2015"],["dc.description.abstract","Interactions among neighbors influence plant performance and should create spatial patterns in local community structure. In order to assess the role of large trees in generating spatial patterns in local species richness we used the individual species-area relationship (ISAR) to evaluate the species richness of trees of different size classes (and dead trees) in neighborhoods with varying size around large trees of different focal species. To reveal signals of species interactions we compared the ISAR function of the individuals of focal species with that of randomly selected nearby locations. We expected that large trees should strongly affect the community structure of smaller trees in their neighborhood, but that these effects should fade away with increasing size class. Unexpectedly we found that only few focal species showed signals of species interactions with trees of the different size classes and that this was less likely for less abundant focal species. However, the few and relatively weak depa..."],["dc.identifier.doi","10.1890/14-1477.1"],["dc.identifier.gro","3148901"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/5538"],["dc.language.iso","en"],["dc.notes.intern","Wiegand Crossref Import"],["dc.notes.status","public"],["dc.notes.submitter","chake"],["dc.relation.issn","0012-9658"],["dc.relation.orgunit","Abteilung Ökosystemmodellierung"],["dc.subject.gro","Independence null model"],["dc.subject.gro","Individual species-area relationship"],["dc.subject.gro","Neighborhood diversity"],["dc.subject.gro","Point pattern analysis"],["dc.subject.gro","Sinharaja tropical forest"],["dc.subject.gro","Spatial scale"],["dc.subject.gro","Stochastic dilution"],["dc.title","Neighborhood diversity of large trees shows independent species patterns in a mixed dipterocarp forest in Sri Lanka"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","no"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]