Klarner, Bernhard

[["dc.bibliographiccitation.firstpage","1212"],["dc.bibliographiccitation.issue","10"],["dc.bibliographiccitation.journal","Oikos"],["dc.bibliographiccitation.lastpage","1223"],["dc.bibliographiccitation.volume","123"],["dc.contributor.author","Ott, David"],["dc.contributor.author","Digel, Christoph"],["dc.contributor.author","Klarner, Bernhard"],["dc.contributor.author","Maraun, Mark"],["dc.contributor.author","Pollierer, Melanie M."],["dc.contributor.author","Rall, Bjoern Christian"],["dc.contributor.author","Scheu, Stefan"],["dc.contributor.author","Seelig, Gesine"],["dc.contributor.author","Brose, Ulrich"],["dc.date.accessioned","2018-11-07T09:34:38Z"],["dc.date.available","2018-11-07T09:34:38Z"],["dc.date.issued","2014"],["dc.description.abstract","To maintain constant chemical composition, i.e. elemental homeostasis, organisms have to consume resources of sufficient quality to meet their own specific stoichiometric demand. Therefore, concentrations of elements indicate resource quality, and rare elements in the environment may act as limiting factors for individual organisms scaling up to constrain population densities. We investigated how the biomass densities of invertebrate populations of temperate forest soil communities depend on 1) the stoichiometry of the basal litter according to ecological stoichiometry concepts and 2) the population average body mass as predicted by metabolic theory. We used a large data set on biomass densities of 4959 populations across 48 forests in three regions of Germany. Following various ecological stoichiometry hypotheses, we tested for effects of the carbon-to-element ratios of 10 elements. Additionally, we included the abiotic litter characteristics habitat size (represented by litter depth), litter diversity and pH, as well as forest type as an indicator for human management. Across 12 species groups, we found that the biomass densities scaled significantly with population-averaged body masses thus supporting metabolic theory. Additionally, 10 of these allometric scaling relationships exhibited interactions with stoichiometric and abiotic co-variables. The four most frequent co-variables were 1) forest type, 2) the carbon-to-phosphorus ratio (C:P), 3) the carbon-to-sodium ratio (C:Na), and the carbon-to-nitrogen ratio (C:N). Hence, our analyses support the sodium shortage hypothesis for microbi-detritivores, the structural elements hypothesis for some predator groups (concerning N), and the secondary productivity hypothesis (concerning P) across all trophic groups in our data. In contrast, the ecosystem size hypothesis was only supported for some meso- and macrofauna detritivores. Our study is thus providing a comprehensive analysis how the elemental stoichiometry of the litter as the basal resource constrain population densities across multiple trophic levels of soil communities."],["dc.description.sponsorship","DFG [1374, BR 2315/7-2]"],["dc.identifier.doi","10.1111/oik.01670"],["dc.identifier.isi","000342754100007"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/32214"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wiley-blackwell"],["dc.relation.issn","1600-0706"],["dc.relation.issn","0030-1299"],["dc.title","Litter elemental stoichiometry and biomass densities of forest soil invertebrates"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","131"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","The American Naturalist"],["dc.bibliographiccitation.lastpage","143"],["dc.bibliographiccitation.volume","190"],["dc.contributor.author","Jochum, Malte"],["dc.contributor.author","Barnes, Andrew D."],["dc.contributor.author","Ott, David"],["dc.contributor.author","Lang, Birgit"],["dc.contributor.author","Klarner, Bernhard"],["dc.contributor.author","Farajallah, Achmad"],["dc.contributor.author","Scheu, Stefan"],["dc.contributor.author","Brose, Ulrich"],["dc.date.accessioned","2018-11-07T10:22:18Z"],["dc.date.available","2018-11-07T10:22:18Z"],["dc.date.issued","2017"],["dc.description.abstract","Living organisms are constrained by both resource quantity and quality. Ecological stoichiometry offers important insights into how the elemental composition of resources affects their consumers. If resource quality decreases, consumers can respond by shifting their body stoichiometry, avoiding low-quality resources, or up-regulating feeding rates to maintain the supply of required elements while excreting excess carbon (i.e., compensatory feeding). We analyzed multitrophic consumer body stoichiometry, biomass, and feeding rates along a resource-quality gradient in the litter of tropical forest and rubber and oil-palm plantations. Specifically, we calculated macroinvertebrate feeding rates based on consumer metabolic demand and assimilation efficiency. Using linear mixed effects models, we assessed resource-quality effects on macroinvertebrate detritivore and predator communities. We did not detect shifts in consumer body stoichiometry or decreases in consumer biomass in response to declining resource quality, as indicated by increasing carbon-to-nitrogen ratios. However, across trophic levels, we found a strong indication of decreasing resource quality leading to increased consumer feeding rates through altered assimilation efficiency and community body size structure. Our study reveals the influence of resource quality on multitrophic consumer feeding rates and suggests compensatory feeding to be more common across consumer trophic levels than was formerly known."],["dc.identifier.doi","10.1086/691790"],["dc.identifier.isi","000403565000012"],["dc.identifier.pmid","28617641"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/42244"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","PUB_WoS_Import"],["dc.relation","SFB 990: Ökologische und sozioökonomische Funktionen tropischer Tieflandregenwald-Transformationssysteme (Sumatra, Indonesien)"],["dc.relation","SFB 990 | B | B01: Structure, stability and functioning of macro-invertebrate communities in rainforest transformation systems in Sumatra (Indonesia)"],["dc.relation","SFB 990 | B | B08: Struktur und Funktion des Zersetzersystems in Transformationssystemen von Tiefland-Regenwäldern"],["dc.relation.issn","1537-5323"],["dc.relation.issn","0003-0147"],["dc.subject.gro","sfb990_journalarticles"],["dc.title","Decreasing Stoichiometric Resource Quality Drives Compensatory Feeding across Trophic Levels in Tropical Litter Invertebrate Communities"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1157"],["dc.bibliographiccitation.issue","10"],["dc.bibliographiccitation.journal","Oikos"],["dc.bibliographiccitation.lastpage","1172"],["dc.bibliographiccitation.volume","123"],["dc.contributor.author","Digel, Christoph"],["dc.contributor.author","Curtsdotter, Alva"],["dc.contributor.author","Riede, Jens O."],["dc.contributor.author","Klarner, Bernhard"],["dc.contributor.author","Brose, Ulrich"],["dc.date.accessioned","2018-11-07T09:34:36Z"],["dc.date.available","2018-11-07T09:34:36Z"],["dc.date.issued","2014"],["dc.description.abstract","Food web topologies depict the community structure as distributions of feeding interactions across populations. Although the soil ecosystem provides important functions for aboveground ecosystems, data on complex soil food webs is notoriously scarce, most likely due to the difficulty of sampling and characterizing the system. To fill this gap we assembled the complex food webs of 48 forest soil communities. The food webs comprise 89 to 168 taxa and 729 to 3344 feeding interactions. The feeding links were established by combining several molecular methods (stable isotope, fatty acid and molecular gut content analyses) with feeding trials and literature data. First, we addressed whether soil food webs (n = 48) differ significantly from those of other ecosystem types (aquatic and terrestrial aboveground, n = 77) by comparing 22 food web parameters. We found that our soil food webs are characterized by many omnivorous and cannibalistic species, more trophic chains and intraguild-predation motifs than other food webs and high average and maximum trophic levels. Despite this, we also found that soil food webs have a similar connectance as other ecosystems, but interestingly a higher link density and clustering coefficient. These differences in network structure to other ecosystem types may be a result of ecosystem specific constraints on hunting and feeding characteristics of the species that emerge as network parameters at the food-web level. In a second analysis of land-use effects, we found significant but only small differences of soil food web structure between different beech and coniferous forest types, which may be explained by generally strong selection effects of the soil that are independent of human land use. Overall, our study has unravelled some systematic structures of soil food-webs, which extends our mechanistic understanding how environmental characteristics of the soil ecosystem determine patterns at the community level."],["dc.description.sponsorship","DFG [1374, BR 2315/7-2, BR 2315/13-2]"],["dc.identifier.doi","10.1111/oik.00865"],["dc.identifier.isi","000342754100002"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/32208"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wiley-blackwell"],["dc.relation.issn","1600-0706"],["dc.relation.issn","0030-1299"],["dc.title","Unravelling the complex structure of forest soil food webs: higher omnivory and more trophic levels"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]