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TZUNTIL:20181028T010000Z
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DTSTART:20161030T030000
TZOFFSETFROM:+0200
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RDATE:20171029T030000
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UID:www.bayceer.uni-bayreuth.de-bayceer-t134918id
DTSTAMP:20260405T203824Z
DESCRIPTION:Community succession is the process of species turning over thr
 ough time following a disturbance. The time since disturbance influences w
 hich assembly processes are strongest in determining the current compositi
 on of communities. Examining the functional identity of species across env
 ironments which are heterogeneous in space or time during succession can r
 eveal the multiple processes driving community dynamics. Specifically\, ex
 tant plant communities following disturbance may alter colonization dynami
 cs indicated by newly arrived species’ seed mass\; soil resource supply ma
 y alter competition outcomes by selecting for species with higher height p
 otential as light becomes an important limiting resource\; and pressure fr
 om herbivores and pathogens may alter competition outcomes by selecting fo
 r species with better defended tissue.\nI examine these co-occurring proce
 sses in an experimental old field across a four-year sequence where I expe
 ct dominant processes to differ. I manipulated initial plant diversity fol
 lowing artificial disturbance\, soil resource supply via nutrient addition
 \, and enemy access via pesticide spraying. The natural colonization of th
 ese experimental plots was monitored and community weighted mean trait sco
 res were calculated for seed mass\, vegetative height\, and specific leaf 
 area (SLA). Results suggest that early in succession community membership 
 is filtered through colonization limitations related to seed mass. As time
  proceeds\, soil resource supply and enemy access became stronger filters 
 of community membership\, with seed mass\, height\, and SLA influencing co
 mmunity membership. Community trait values shifted in response to soil res
 ource supply and enemy access due to both among-species and within-species
  trait variation\, suggesting that some species are able to respond to env
 ironmental heterogeneity by altering their physiology. Ultimately\, the sy
 stem showed a rapid change in dominant assembly processes following distur
 bance\, where community membership shifted from being colonization dominat
 ed to competition dominated.
DTSTART;TZID=Europe/Berlin:20161201T120000
DTEND;TZID=Europe/Berlin:20161201T133000
LOCATION:H6\, GEO
SUMMARY:Dr. Peter Wilfahrt\, Disturbance Ecology\, BayCEER\, UBT (Homepage)
 : Initial plant diversity\, soil resource supply\, and enemy access drive 
 different ecological tradeoffs during old-field succession
TRANSP:TRANSPARENT
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