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DTSTART:20151025T030000
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RDATE:20161030T030000
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UID:bio-intern.uni-bayreuth.de-bayceer-t131640id
DTSTAMP:20260906T040333Z
DESCRIPTION:Tropical forests are extremely divers. Over 300 tree species ca
 n coexist in a single hectare and as many as 16\,000 tree species are thou
 ght to exist in the Amazon basin alone. Why are tropical forests so remark
 ably diverse? This is a key\, yet unresolved question facing Ecology. Show
 casing some of my and collaborators work from Bolivia and Panama\, I will 
 demonstrate how two of the most persisting theories explaining tropical sp
 ecies coexistence\, the Niche Theory and the Janzen-Connell Hypothesis\, a
 re 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 Un
 iversity.  Niche Theory postulates that differences among species govern t
 heir specialization for distinct resource niches – so-called niche partiti
 oning. I will show how this is true for coexisting tropical tree species a
 nd how species’ functional traits influence their competitive success and 
 performance along combined water and light gradients. As Niche Theory is n
 ot particularly good at explaining why ‘stronger’ competitors do not alway
 s outcompete ‘weaker’ ones and become locally dominant\, alternative mecha
 nisms are needed. This is where the Janzen-Connell Hypothesis becomes impo
 rtant\, as it postulates that density-dependent mortality mediated by plan
 t 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 ne
 gative-density dependence and diversity across a tropical rainfall gradien
 t using novel findings from a large field-based study in Central Panama. F
 inally\, 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 ex
 plain the directional turnover of tree species during secondary tropical f
 orest succession\, and to inform and improve restoration ecology and susta
 inable reforestation efforts in the tropics.\n \n*** Invited by Bettina En
 gelbrecht\, Functional and Tropical Plant Ecology / Fachgruppe Biologie
DTSTART;TZID=Europe/Berlin:20151028T151500
DTEND;TZID=Europe/Berlin:20151028T164500
LOCATION:H36\, NW III
SUMMARY:Dr. Lars Markesteijn\, Community Ecology Research Oxford\, Universi
 ty of Oxford\, UK / Smithsonian Tropical Research Institute\, Panama (Home
 page): What determines biological diversity?
TRANSP:TRANSPARENT
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