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Vortragsreihe Ökologie und Umweltforschung WS 2015/16

Donnerstag 12:00-13:30 H6, Geo


Dr. Lars Markesteijn
Community Ecology Research Oxford, University of Oxford, UK / Smithsonian Tropical Research Institute, Panama (Homepage)
Mittwoch, , 28.10.2015 15:15-16:45 H36, NW III:

What determines biological diversity?

Tropical forests are extremely divers. Over 300 tree species can coexist in a single hectare and as many as 16,000 tree species are thought to exist in the Amazon basin alone. Why are tropical forests so remarkably diverse? This is a key, yet unresolved question facing Ecology.
Showcasing some of my and collaborators work from Bolivia and Panama, I will demonstrate how two of the most persisting theories explaining tropical species coexistence, the Niche Theory and the Janzen-Connell Hypothesis, are mutually compatible and I will use these examples to introduce a novel avenue of future research that I aim to develop further at the Bayreuth University.
Niche Theory postulates that differences among species govern their specialization for distinct resource niches – so-called niche partitioning. I will show how this is true for coexisting tropical tree species and how species’ functional traits influence their competitive success and performance along combined water and light gradients.
As Niche Theory is not particularly good at explaining why ‘stronger’ competitors do not always outcompete ‘weaker’ ones and become locally dominant, alternative mechanisms are needed. This is where the Janzen-Connell Hypothesis becomes important, as it postulates that density-dependent mortality mediated by plant natural enemies -fungal pathogens and insect herbivores-, puts locally rare species at an advantage, preventing any one species from dominating. I will illustrate this by showing how natural enemies drive changes in negative-density dependence and diversity across a tropical rainfall gradient using novel findings from a large field-based study in Central Panama.
Finally, I will elaborate on how I aim to combine key elements from Niche Theory and the Janzen-Connell Mechanism in a new project at Bayreuth to explain the directional turnover of tree species during secondary tropical forest succession, and to inform and improve restoration ecology and sustainable reforestation efforts in the tropics.

 

*** Invited by Bettina Engelbrecht, Functional and Tropical Plant Ecology / Fachgruppe Biologie



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DatumVortragenderTitel
Mittwoch
Room 204, 2. floor/Geo III
10:00-11:30
07.10.2015
Dr. Lucian Staicu
University of Franche-Comté, Department of Science and Technology, Besançon, France
Bacterial metabolism of selenium. Survival or profit? [Abstract]
15.10.2015Prof. Dr. Werner Härdtle
Landscape Ecology and Nature Conservation, University of Lüneburg
Global change impacts on ecosystem functions – the importance of interactive effects [Abstract]
22.10.2015Prof. Declan Kennedy
formerly Chair of Urban Design, Dept. of Architecture, TU Berlin
The New Story Movement and Sustainability [Abstract]
Freitag
H27, GW II
09:00-16:00
23.10.2015
- siehe Aushänge -
Berufungsvorträge zur W3-Professur Sportökologie [Abstract]
Mittwoch
H36, NW III
15:15-16:45
28.10.2015
Dr. Lars Markesteijn
Community Ecology Research Oxford, University of Oxford, UK / Smithsonian Tropical Research Institute, Panama
What determines biological diversity? [Abstract]
29.10.2015Dr. Sergio Calabrese
Università degli Studi di Palermo; Department of Earth and Marine Science (DiSTeM); Italy
Environmental impact of volcanic emissions [Abstract]
12.11.2015Dr. Dylan James Craven
German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig
Biodiversity effects on ecosystem stability following climate extremes [Abstract]
19.11.2015Dr. Christoph Schmidt
Geomorphology, BayCEER, University of Bayreuth
Of trapped electrons and their relevance in tracing landscape evolution and human history [Abstract]
26.11.2015Dr. Derek Persoh
Institute for Evolution and Biodiversity of Plants, Ruhr-University of Bochum
Fungal community structure and function - from current knowledge towards predictability [Abstract]
Freitag
H10, NW I
14:15-15:45
27.11.2015
Prof. Dr. Alexandra-Maria Klein
Naturschutz und Landschaftsökologie, Albert-Ludwigs-Universität Freiburg
Functional diversity, complementarity and trait identity in pollination studies [Abstract]
03.12.2015Dr. Harald Pauli
Department of Conservation Biology, Vegetation and Landscape Ecology Institute of Ecology and Conservation Biology University of Vienna
Past and recent changes in European alpine plant diversity: increases, declines, stagnations and accelerations driven by climate change [Abstract]
10.12.2015Dr. Severin Irl
Biogeography, BayCEER, University of Bayreuth
Plant diversity on high-elevation islands – drivers of species richness and endemism [Abstract]
13:00-14:30
14.01.2016
Prof. Dr. Johannes Kollmann
Restoration Ecology, TUM, Freising
Transformation of grasslands in South Brazil - effects of changing land use on biodiversity and ecosystem functions [Abstract]
21.01.2016Dr. Marie Spohn
Soil Ecology, BayCEER, University of Bayreuth
Organic phosphorus mineralization and microbial carbon allocation in soil [Abstract]
28.01.2016
BayCEER Mitgliederversammlung [Abstract]
Freitag
Dr.-Hans-Frisch-Str. 1-3, Raum H7 (Bibliothek)
13:00-14:30
29.01.2016
PD Dr. Reinhard Well, Dr. Lena Rohe
Institut für Agrarklimaschutz, Johann Heinrich von Thünen Institut
Advanced stable isotope tracing and natural abundance methods to unravel N-cycling processes
Terminplanung und Vortragsarchiv BayCEER Kolloquium (seit 2008) sowie Geoökologisches Kolloquium (ab 2001)
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