BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//www.bayceer.uni-bayreuth.de//NONSGML kigkonsult.se iCalcreator 2.41.92//
CALSCALE:GREGORIAN
METHOD:PUBLISH
UID:34633331-6133-4064-b965-326566613662
X-WR-CALNAME:BayCMS-Export
X-WR-CALDESC:This is a calendar exported from BayCMS
X-WR-TIMEZONE:Europe/Berlin
BEGIN:VTIMEZONE
TZID:Europe/Berlin
TZUNTIL:20141026T010000Z
BEGIN:STANDARD
TZNAME:CET
DTSTART:20121028T030000
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
RDATE:20131027T030000
END:STANDARD
BEGIN:DAYLIGHT
TZNAME:CEST
DTSTART:20120325T020000
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
RDATE:20130331T020000
RDATE:20140330T020000
END:DAYLIGHT
END:VTIMEZONE
BEGIN:VEVENT
UID:www.bayceer.uni-bayreuth.de-bayceer-t108782id
DTSTAMP:20260817T072302Z
DESCRIPTION: \nEcological processes resulting from global change\, such as 
 more frequent extreme summer drought or increased propagule pressure of ex
 otic species\, often affect plant communities gradually at time scales of 
 years or decades and may therefore not often be distinctly recognized.  Th
 e effects of potential interactions of such processes are largely unknown.
   Interactions may partly compensate single effects and contribute to cons
 tancy of communities and ecosystems.  However\, ecologists are increasingl
 y concerned about potentially adverse interactions that may stimulate casc
 ades of species extinctions.\nOver the last decade sowing experiments have
  found reliable evidence for seed-availability related effects on the loca
 l occurrence of species\, the size of populations and the richness and pro
 ductivity of communities.  This implies that processes influencing the pro
 duction and dispersal of seeds and/or the establishment of seedlings are i
 mportant for the functioning of ecosystems.  However\, most of these exper
 iments have applied seed additions at one single level of density.  With s
 uch an approach\, the degree of seed limitation cannot be quantified and t
 he relationship between seed rain and number of successfully establishing 
 species has remained obscure.  Yet\, the natural seed rain as also the pro
 duction of seeds (community fecundity) have not been measured in the conte
 xt of seed-addition studies and we still lack the information on how many 
 species and/or individuals may be added to a saturation of the community a
 nd how many propagules are needed to reach species saturation of the commu
 nity.\nAlthough major cases of adverse invasions have not occurred so far\
 , we suspect that species-rich meadows that show a high seedling turnover 
 are potentially susceptible to invasion.  Current invasibility theory pred
 icts increased invasion during temporary resource pulses that could be ass
 ociated with increased variability of rainfall.  Successful invasion may p
 rimarily depend on the propagule pressures of local resident and potential
  invader species.  A new multi-factorial seed-addition experiment will inv
 estigate hypotheses concerning the main and interactive effects of product
 ivity\, summer drought\, origin of species\, and propagule pressure.  The 
 experiment will be started in 2010 in meadows covering a wide productivity
  gradient in different Swiss regions.  The knowledge gained from this expe
 riment will be used to predict grassland invasibility and help to adapt th
 e management of Swiss meadows to climate change.
DTSTART;TZID=Europe/Berlin:20130131T170000
DTEND;TZID=Europe/Berlin:20130131T183000
SUMMARY:PD Dr. Andreas Stampfli\, Plant Sciences\, University of Bern\, Swi
 tzerland: Invasibility of Swiss Grasslands
TRANSP:TRANSPARENT
END:VEVENT
END:VCALENDAR