Now showing 1 - 10 of 20
  • 2010Journal Article
    [["dc.bibliographiccitation.firstpage","788"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","Plant Biology"],["dc.bibliographiccitation.lastpage","793"],["dc.bibliographiccitation.volume","12"],["dc.contributor.author","Kessler, Michael"],["dc.contributor.author","Jonas, R."],["dc.contributor.author","Cicuzza, Daniele"],["dc.contributor.author","Kluge, J."],["dc.contributor.author","Piatek, K."],["dc.contributor.author","Naks, P."],["dc.contributor.author","Lehnert, Marcus"],["dc.date.accessioned","2018-11-07T08:40:07Z"],["dc.date.available","2018-11-07T08:40:07Z"],["dc.date.issued","2010"],["dc.description.abstract","The colonisation of land by plants may not have been possible without mycorrhizae, which supply the majority of land plants with nutrients, water and other benefits. In this sense, the mycorrhization of basal groups of land plants such as ferns and lycophytes is of particular interest, yet only about 9% of fern and lycophyte species have been sampled for their mycorrhization status, and no community-level analyses exist for tropical fern communities. In the present study, we screened 170 specimens of ferns and lycophytes from Malaysia and Sulawesi (Indonesia), representing 126 species, and report the mycorrhization status for 109 species and 19 genera for the first time. Mycorrhizal colonisations were detected in 96 (56.5%) of the specimens, 85 of which corresponded to arbuscular mycorrhizae (AMF), three to dark-septate endophytes (DSE) and four to mixed colonisations (AMF + DSE). DSE colonisations were lower than in comparable samples of ferns from the Andes, suggesting a geographical or taxonomic pattern in this type of colonisation. Epiphytes had significantly lower levels of colonisation (26.1%) than terrestrial plants (70.7%), probably due to the difficulty of establishment of mycorrhizal fungi in the canopy habitat."],["dc.description.sponsorship","Deutsche Forschungsgemeinschaft"],["dc.identifier.doi","10.1111/j.1438-8677.2009.00270.x"],["dc.identifier.isi","000280999100012"],["dc.identifier.pmid","20701702"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/19153"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wiley-blackwell"],["dc.relation.issn","1435-8603"],["dc.title","A survey of the mycorrhization of Southeast Asian ferns and lycophytes"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]
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  • 2015Journal Article
    [["dc.bibliographiccitation.firstpage","13"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Plant Ecology & Diversity"],["dc.bibliographiccitation.lastpage","24"],["dc.bibliographiccitation.volume","8"],["dc.contributor.author","Salazar, Laura"],["dc.contributor.author","Homeier, Juergen"],["dc.contributor.author","Kessler, Michael"],["dc.contributor.author","Abrahamczyk, Stefan"],["dc.contributor.author","Lehnert, Marcus"],["dc.contributor.author","Kroemer, Thorsten"],["dc.contributor.author","Kluge, Juergen"],["dc.date.accessioned","2018-11-07T10:02:23Z"],["dc.date.available","2018-11-07T10:02:23Z"],["dc.date.issued","2015"],["dc.description.abstract","Background: Biodiversity is perceived to decline from lowlands towards mountain peaks and away from the Equator towards the Poles, but supporting data for most groups of organisms are lacking, especially at the local scale. Aims: Elevational gradients of fern species richness in tropical forest habitats were analysed to test the hypotheses that fern species composition patterns were similar between elevational gradients, that total species richness of complete elevational gradients gradually declined due to changing climatic conditions with increasing distance from the Equator, and that the elevation of highest species richness gradually declined with increasing latitude. Methods: We used plot-based elevational fern species richness surveys compiled from recent field work and own published studies, between 18 degrees N and 18 degrees S along the Andean mountain range, and compared the transects of patterns of species richness and composition, and distribution of taxa. Results: Taxonomic composition was highly similar among tropical regions. Elevational richness patterns were symmetrically hump-shaped and overall richness was virtually equal along most of the tropical latitudinal gradient. In contrast, the subtropical localities at the edges of our study area, ca. 18 degrees N and 18 degrees S, showed strikingly different patterns from those in the tropical zone. Conclusions: Within the tropics, there appears to be no latitudinal diversity gradient of ferns at the local scale. We suggest that, in tropical habitats, species richness of ferns at the local scale is limited by the number of species that can co-occur and that the available niche space is saturated."],["dc.description.sponsorship","Schweizer Nationalfonds (SNF); German Academic Exchange Service (DAAD)"],["dc.identifier.doi","10.1080/17550874.2013.843036"],["dc.identifier.isi","000349391300002"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/38214"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Taylor & Francis Ltd"],["dc.relation.issn","1755-1668"],["dc.relation.issn","1755-0874"],["dc.title","Diversity patterns of ferns along elevational gradients in Andean tropical forests"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]
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  • 2014Journal Article
    [["dc.bibliographiccitation.firstpage","887"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Oecologia"],["dc.bibliographiccitation.lastpage","900"],["dc.bibliographiccitation.volume","175"],["dc.contributor.author","Kessler, Michael"],["dc.contributor.author","Guedel, Ramona"],["dc.contributor.author","Salazar, Laura"],["dc.contributor.author","Homeier, Juergen"],["dc.contributor.author","Kluge, Juergen"],["dc.date.accessioned","2018-11-07T09:38:21Z"],["dc.date.available","2018-11-07T09:38:21Z"],["dc.date.issued","2014"],["dc.description.abstract","Mycorrhizal fungi are crucial for the ecological success of land plants, providing their hosts with nutrients in exchange for organic C. However, not all plants are mycorrhizal, especially ferns, of which about one-third of the species lack this symbiosis. Because the mycorrhizal status is evolutionarily ancestral, this lack of mycorrhizae must have ecological advantages, but what these advantages are and how they affect the competitive ability of non-mycorrhizal plants under natural conditions is currently unknown. To address this uncertainty, we studied terrestrial fern assemblages and species abundances as well as their mycorrhization status, leaf nutrient concentration and relative annual growth along an elevational gradient in the Ecuadorian Andes (500-4,000 m). We surveyed the mycorrhizal status of 375 root samples belonging to 85 species, and found mycorrhizae in 89 % of the samples. The degree of mycorrhization decreased with elevation but was unrelated to soil nutrients. Species with mycorrhizae were significantly more abundant than non-mycorrhizal species, but non-mycorrhizal species had significantly higher relative growth and concentrations of leaf N, P, Mg, and Ca. Our study thus shows that despite lower abundances, non-mycorrhizal fern species did not appear to be limited in their growth or nutrient supply relative to mycorrhizal ones. As a basis for future studies, we hypothesize that non-mycorrhizal fern species may be favoured in special microhabitats of the forest understory with high soil nutrient or water availability, or that the ecological benefit of mycorrhizae is not related to nutrient uptake but rather to, for example, pathogen resistance."],["dc.identifier.doi","10.1007/s00442-014-2941-7"],["dc.identifier.isi","000338202600013"],["dc.identifier.pmid","24719210"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/33049"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","1432-1939"],["dc.relation.issn","0029-8549"],["dc.title","Impact of mycorrhization on the abundance, growth and leaf nutrient status of ferns along a tropical elevational gradient"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]
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  • 2006Journal Article
    [["dc.bibliographiccitation.firstpage","535"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","Diversity and Distributions"],["dc.bibliographiccitation.lastpage","545"],["dc.bibliographiccitation.volume","12"],["dc.contributor.author","Kluge, Juergen"],["dc.contributor.author","Kessler, Michael"],["dc.date.accessioned","2018-11-07T09:18:19Z"],["dc.date.available","2018-11-07T09:18:19Z"],["dc.date.issued","2006"],["dc.description.abstract","We studied the distribution patterns of endemic ferns along an elevational gradient of 3400 m in Costa Rica, Central America. We related the endemism patterns of the whole species set and separated for life forms and microhabitats according to topography and environmental factors. Fern species were surveyed in 156 plots each with an area of 400 m(2), with up to five plots at every elevational step of 100 m. Global range size for every species was compiled from literature data, and species restricted to the mountain range from Costa Rica and adjacent western Panama were defined as endemic (24.5% of all species recorded). We found patterns of endemism rates mostly peaking at mid-elevation, but when separated for different life forms and microhabitats, some deviations from the overall pattern emerged. High constant humidity and reduced surface area were closely related to high levels of endemism. High humidity is discussed as a general predictor for high endemism rates in concert with highest overall richness. Restricted area of elevational belts, indicating a fragmented habitat, leads to a higher degree of population isolation and thus species differentiation. However, both interpretations were not fully supported by our data. Most importantly, endemism rates were fairly low on mountain tops that have the smallest available area in a topographically highly fragmented setting. In contrast, endemic species were more common than widespread species at the highest elevations. History and climatic shifts are assumed to play a role in this respect."],["dc.identifier.doi","10.1111/j.1366-9516.2006.00231.x"],["dc.identifier.isi","000239798200008"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/28381"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Blackwell Publishing"],["dc.relation.issn","1366-9516"],["dc.title","Fern endemism and its correlates: contribution from an elevational transect in Costa Rica"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]
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  • 2006Journal Article
    [["dc.bibliographiccitation.firstpage","358"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Global Ecology and Biogeography"],["dc.bibliographiccitation.lastpage","371"],["dc.bibliographiccitation.volume","15"],["dc.contributor.author","Kluge, Juergen"],["dc.contributor.author","Kessler, Michael"],["dc.contributor.author","Dunn, Robert R."],["dc.date.accessioned","2018-11-07T09:35:47Z"],["dc.date.available","2018-11-07T09:35:47Z"],["dc.date.issued","2006"],["dc.description.abstract","Aim We studied pteridophyte species richness between 100 m and 3400 m along a Neotropical elevational gradient and tested competing hypotheses for patterns of species richness. Location Elevational transects were situated at Volcan Barva in the Braulio Carrillo National Park and La Selva Biological Station (100-2800 m) and Cerro de la Muerte (2700-3400 m), both on the Atlantic slope of Costa Rica, Central America. Method We analysed species richness on 156 plots of 20 x 20 m and measured temperature and humidity at four elevations (40, 650, 1800 and 2800 m). Species richness patterns were regressed against climatic variables (temperature, humidity, precipitation and actual evapotranspiration), regional species pool, area and predicted species number of a geometric null model (the mid-domain effect, MDE). Results The species richness of the 484 recorded species showed a hump-shaped pattern with elevation with a richness peak at mid-elevations (c. 1700 m). The MDE was the single most powerful explanatory variable in linear regression models, but species richness was also associated strongly with climatic variables, especially humidity and temperature. Area and species pool were associated less strongly with observed richness patterns. Main conclusions Geometric models and climatic models exclusive of geometric constraints explained comparable amounts of the elevational variation in species richness. Discrimination between these two factor complexes is not possible based on model fits. While overall fits of geometric models were high, large- and small-ranged species were explained by geometric models to different extents. Species with narrow elevational ranges clustered at both ends of the gradient to a greater extent than predicted by the MDE null models used here. While geometric models explained much of the pattern in species richness, we cannot rule out the role of climatic factors (or vice versa) because the predicted peak in richness from geometric models, the empirical peak in richness and the overlap in favourable environmental conditions all coincide at middle elevations. Mid-elevations offer highest humidity and moderate temperatures, whereas at high elevations richness is reduced due to low temperatures, and at low elevations by reduced water availability due to high temperatures."],["dc.identifier.doi","10.1111/j.1466-822x.2006.00223.x"],["dc.identifier.isi","000239310400005"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/32468"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Blackwell Publishing"],["dc.relation.issn","1466-822X"],["dc.title","What drives elevational patterns of diversity? A test of geometric constraints, climate and species pool effects for pteridophytes on an elevational gradient in Costa Rica"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]
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  • 2017Journal Article
    [["dc.bibliographiccitation.firstpage","33"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Medizinische Klinik - Intensivmedizin und Notfallmedizin"],["dc.bibliographiccitation.lastpage","44"],["dc.bibliographiccitation.volume","113"],["dc.contributor.author","Waydhas, C."],["dc.contributor.author","Herting, E."],["dc.contributor.author","Kluge, S."],["dc.contributor.author","Markewitz, A."],["dc.contributor.author","Marx, G."],["dc.contributor.author","Muhl, E."],["dc.contributor.author","Nicolai, T."],["dc.contributor.author","Notz, K."],["dc.contributor.author","Parvu, V."],["dc.contributor.author","Quintel, M."],["dc.contributor.author","Rickels, E."],["dc.contributor.author","Schneider, D."],["dc.contributor.author","Steinmeyer-Bauer, K. R."],["dc.contributor.author","Sybrecht, G."],["dc.contributor.author","Welte, T."],["dc.date.accessioned","2020-12-10T14:07:58Z"],["dc.date.available","2020-12-10T14:07:58Z"],["dc.date.issued","2017"],["dc.identifier.doi","10.1007/s00063-017-0369-7"],["dc.identifier.eissn","2193-6226"],["dc.identifier.issn","2193-6218"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/70344"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Intermediate Care Station"],["dc.title.alternative","Intermediate care units. Recommendations on facilities and structure"],["dc.title.subtitle","Empfehlungen zur Ausstattung und Struktur"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]
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  • 2010Journal Article
    [["dc.bibliographiccitation.firstpage","330"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Journal of Applied Ecology"],["dc.bibliographiccitation.lastpage","339"],["dc.bibliographiccitation.volume","48"],["dc.contributor.author","Kessler, Michael"],["dc.contributor.author","Abrahamczyk, Stefan"],["dc.contributor.author","Bos, Merijn M."],["dc.contributor.author","Buchori, Damayanti"],["dc.contributor.author","Putra, Dadang Dwi"],["dc.contributor.author","Robbert Gradstein, S."],["dc.contributor.author","Höhn, Patrick"],["dc.contributor.author","Kluge, Jürgen"],["dc.contributor.author","Orend, Friederike"],["dc.contributor.author","Pitopang, Ramadhanil"],["dc.contributor.author","Saleh, Shahabuddin"],["dc.contributor.author","Schulze, Christian H."],["dc.contributor.author","Sporn, Simone G."],["dc.contributor.author","Steffan-Dewenter, Ingolf"],["dc.contributor.author","Tjitrosoedirdjo, Sri Sudarmiyati"],["dc.contributor.author","Tscharntke, Teja"],["dc.date.accessioned","2017-09-07T11:54:42Z"],["dc.date.available","2017-09-07T11:54:42Z"],["dc.date.issued","2010"],["dc.description.abstract","1. Biodiversity data are needed for conservation and management of tropical habitats, but the high diversity of these ecosystems makes comprehensive surveys prohibitively expensive and indicator taxa reflecting the biodiversity patterns of other taxa are frequently used. Few studies have produced the necessary comprehensive data sets to assess the quality of the indicator groups, however, and only one previous study has considered the monetary costs involved in sampling them.2. We surveyed four plant groups (herbs, liverworts, trees, lianas) and eight animal groups (ants, canopy and dung beetles, birds, butterflies, bees, wasps and the parasitoids of the latter two) in 15 plots of 50 × 50 m2 each, representing undisturbed rainforest and two types of cacao agroforest in Sulawesi, Indonesia. We calculated three biodiversity measures (α and β diversity; percentage of species indicative of habitat conditions), built simple and multiple regression models among species groups (single groups, combinations of 2–11 groups, averaged relative diversity of all 12 groups), and related these to three measures of survey cost (absolute costs and two approaches correcting for different sampling intensities).3. Determination coefficients (R2 values) of diversity patterns between single study groups were generally low (<0·25), while the consideration of several study groups increased R2 values to up to 0·8 for combinations of four groups, and to almost 1·0 for combinations of 11 groups. Survey costs varied 10-fold between study groups, but their cost-effectiveness (indicator potential versus monetary cost) varied strongly depending on the biodiversity aspect taken into account (α or β diversity, single or multiple groups, etc.).4. Synthesis and applications. We found that increasing the number of taxa resulted in best overall biodiversity indication. We thus propose that the most cost-efficient approach to general tropical biodiversity inventories is to increase taxonomic coverage by selecting taxa with the lowest survey costs."],["dc.identifier.doi","10.1111/j.1365-2664.2010.01932.x"],["dc.identifier.gro","3150082"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/6811"],["dc.language.iso","en"],["dc.notes.status","public"],["dc.relation.issn","0021-8901"],["dc.title","Cost-effectiveness of plant and animal biodiversity indicators in tropical forest and agroforest habitats"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","no"],["dspace.entity.type","Publication"]]
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  • 2020Journal Article
    [["dc.bibliographiccitation.firstpage","37"],["dc.bibliographiccitation.issue","S2"],["dc.bibliographiccitation.journal","Medizinische Klinik - Intensivmedizin und Notfallmedizin"],["dc.bibliographiccitation.lastpage","109"],["dc.bibliographiccitation.volume","115"],["dc.contributor.author","Brunkhorst, F. M."],["dc.contributor.author","Weigand, M. A."],["dc.contributor.author","Pletz, M."],["dc.contributor.author","Gastmeier, P."],["dc.contributor.author","Lemmen, S. W."],["dc.contributor.author","Meier-Hellmann, A."],["dc.contributor.author","Ragaller, M."],["dc.contributor.author","Weyland, A."],["dc.contributor.author","Marx, G."],["dc.contributor.author","Bucher, M."],["dc.contributor.author","Gerlach, H."],["dc.contributor.author","Salzberger, B."],["dc.contributor.author","Grabein, B."],["dc.contributor.author","Welte, T."],["dc.contributor.author","Werdan, K."],["dc.contributor.author","Kluge, S."],["dc.contributor.author","Bone, H. G."],["dc.contributor.author","Putensen, C."],["dc.contributor.author","Rossaint, R."],["dc.contributor.author","Quintel, M."],["dc.contributor.author","Spies, C."],["dc.contributor.author","Weiß, B."],["dc.contributor.author","John, S."],["dc.contributor.author","Oppert, M."],["dc.contributor.author","Jörres, A."],["dc.contributor.author","Brenner, T."],["dc.contributor.author","Elke, G."],["dc.contributor.author","Gründling, M."],["dc.contributor.author","Mayer, K."],["dc.contributor.author","Weimann, A."],["dc.contributor.author","Felbinger, T. W."],["dc.contributor.author","Axer, H."],["dc.date.accessioned","2020-12-10T14:08:01Z"],["dc.date.available","2020-12-10T14:08:01Z"],["dc.date.issued","2020"],["dc.identifier.doi","10.1007/s00063-020-00685-0"],["dc.identifier.eissn","2193-6226"],["dc.identifier.issn","2193-6218"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/70354"],["dc.language.iso","de"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","S3-Leitlinie Sepsis – Prävention, Diagnose, Therapie und Nachsorge"],["dc.title.alternative","S3 Guideline Sepsis—prevention, diagnosis, therapy, and aftercare. Long version"],["dc.title.subtitle","Langfassung"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]
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  • 2012Journal Article
    [["dc.bibliographiccitation.firstpage","277"],["dc.bibliographiccitation.journal","Ecological Indicators"],["dc.bibliographiccitation.lastpage","281"],["dc.bibliographiccitation.volume","20"],["dc.contributor.author","Karger, Dirk Nikolaus"],["dc.contributor.author","Kluge, Juergen"],["dc.contributor.author","Abrahamczyk, Stefan"],["dc.contributor.author","Salazar, Laura"],["dc.contributor.author","Homeier, Juergen"],["dc.contributor.author","Lehnert, Marcus"],["dc.contributor.author","Amoroso, Victor B."],["dc.contributor.author","Kessler, Michael"],["dc.date.accessioned","2018-11-07T09:07:02Z"],["dc.date.available","2018-11-07T09:07:02Z"],["dc.date.issued","2012"],["dc.description.abstract","Climatic conditions are a prime candidate to explain local patterns of biodiversity and consequently there is great need of on-site climatic measurements. Among them, however, air humidity is notoriously difficult and time-consuming to measure, and it has been proposed that the epiphytic bryophyte cover can be used as an indicator of long-term air humidity conditions. Here we explore the utility of visually estimated epiphytic bryophyte cover on large canopy branches as a proxy for air humidity at 26 study sites in tropical forests where we measured microclimate for at least 12 months. Across all sites, bryophyte cover was weakly related to relative air humidity (R-2 = 0.17), but when we separated highland (1800-3500 m elevation) from lowland (<1800m) sites, relative air humidity showed significant and distinct relations to bryophyte cover (R-2 = 0.36-0.62), whereas temperature was related to bryophyte cover only in the lowlands (R-2 = 0.36). We conclude that epiphytic bryophyte cover can be used as a proxy for air humidity if temperature and elevation are taken into account within a circumscribed study region, but might not be applicable for comparisons across extensive elevational gradients or wide differences in temperature. (C) 2012 Elsevier Ltd. All rights reserved."],["dc.identifier.doi","10.1016/j.ecolind.2012.02.026"],["dc.identifier.isi","000303788000032"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/25698"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Bv"],["dc.relation.issn","1470-160X"],["dc.title","Bryophyte cover on trees as proxy for air humidity in the tropics"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]
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  • 2007Journal Article
    [["dc.bibliographiccitation.firstpage","223"],["dc.bibliographiccitation.issue","2-4"],["dc.bibliographiccitation.journal","Ecological Modelling"],["dc.bibliographiccitation.lastpage","233"],["dc.bibliographiccitation.volume","207"],["dc.contributor.author","Kessler, Michael"],["dc.contributor.author","Boehner, Juergen"],["dc.contributor.author","Kluge, Juergen"],["dc.date.accessioned","2018-11-07T10:57:49Z"],["dc.date.available","2018-11-07T10:57:49Z"],["dc.date.issued","2007"],["dc.description.abstract","one of the major problems in assessing growth conditions of trees at upper tropical tree lines that the vast majority of tree lines have been influenced or destroyed by human activities. Confronted with this situation, we modelled tree height of Polylepis trees in the Bolivian Andes correlating field data from 167 Polylepis stands and a climatic model at a resolution of 925 m x 925 m, across a wide range of elevations and tree growth conditions. Overall, mean annual temperature showed the strongest relationship to tree height (r(2) =0.73), closely followed by a temperature index summing up temperatures above 6.5 degrees C (r(2) = 0.71) and elevation (r(2) = 0.68). Mean annual precipitation (r(2) =0.32), humidity balance (r(2) = 0.27), potential evaporation (r(2) = 0.26), and solar radiation (r(2) =0.18) all showed much weaker relationships to tree height. However, when we divided the Bolivian Andes into three contrasting bioclimatic regions and used residual tree height (against temperature) as a variable, in the humid NE Bolivian Andes solar radiation was significantly positively related to residuals of tree height, in semi-arid SE Bolivia humidity balance and mean annual precipitation had positive and solar radiation negative influence, and in the arid W cordillera mean annual precipitation had positive influence. Our modelling approach thus confirms the overall predominance of temperatures in determining tree height growth. This temperature-determined pattern is regionally modified by positive effects of increasing water availability in arid regions and of increasing solar radiation in very humid and cloudy regions. This suggests that tree growth is primarily limited by temperatures (ca. 70% of the variance explained), but that water and light availability also play a role (an additional 5%). Accordingly, it appears that there may not be one constant factor limiting tree growth at high elevations, but rather that different tree lines may be affected by different combinations of climatic factors which in turn lead to different ecophysiological effects. (C) 2007 Published by Elsevier B.V"],["dc.identifier.doi","10.1016/j.ecolmodel.2007.05.001"],["dc.identifier.isi","000250167800014"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/50339"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Bv"],["dc.relation.issn","0304-3800"],["dc.title","Modelling tree height to assess climatic conditions at tree lines in the Bolivian Andes"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]
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