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DTSTART:20121028T030000
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DESCRIPTION:\nOffizielle Antrittsvorlesung mit anschließendem 'Nikolausempf
 ang'\n\n  \nExotic invasive species are considered one of the largest thre
 at to biodiversity worldwide\, and the impact is expected to further incre
 ase under global climate change. Moreover\, ecosystem invasion by exotic p
 lant species may cause marked changes in biogeochemical cycles and ecosyst
 ems functioning\, thereby accelerating environmental change.\nHowever\, th
 e processes and characteristics which turn an introduced exotic species in
 to an aggressive invader allowing its dominance the invaded ecosystems is 
 still an open question. Similarly\, were little is known on the functional
  changes that these ecosystem engineers induce in the invaded systems. \nT
 hese questions are explored in a case study of a non-native resource-deman
 ding acacia: Acacia longifolia\, native to Australia\, successfully invade
 s water-limited sand dune systems worldwide with large ecological and econ
 omic impact. This drought-susceptible N-fixer follows a water spender stra
 tegy and exhibit different functional traits compared to native Mediterran
 ean species. In the invaded systems acacia markedly altered the ecosystem 
 structure\, water balance\, carbon gain and N-cycle of the native vegetati
 on (Rascher et al. 2011\, 2012). Hence\, exotic species can have significa
 nt impacts on hydrological cycle in resource-limited semi-arid ecosystems 
 through a repartitioning of water resources between the native and invasiv
 e species. Moreover\, the introduction of novel traits into a community li
 ke high resource use (water spender) and N-fixation can promote invasivene
 ss through changes in the water and nutrient cycle of the invaded system\,
  thereby potentially disrupting the co-evolved interactions within the nat
 ive plant community. This may have broad implications for the sustainabili
 ty of Mediterranean dune forests in the future\, since water is predicted 
 to be an increasingly limited resource under climate change scenarios.\n 
 \nRascher et al. 2011\, Understory invasion by Acacia longifolia alters th
 e water balance and carbon gain of a Mediterranean pine forest. Ecosystems
  14: 904–919 (doi:10.1007/s10021-011-9453-7) \nRascher et al. 2012\, Commu
 nity scale 15N isoscapes: tracing the spatial impact of an exotic N2-fixin
 g invader. Ecology Letters\, 15: 484–491\, doi10.1111/j.1461-0248.2012.017
 61.x\n \n 
DTSTART;TZID=Europe/Berlin:20121206T170000
DTEND;TZID=Europe/Berlin:20121206T183000
LOCATION:H8\, GEO
SUMMARY:Prof. Dr. Christiane Werner\, Functional / Agroecosystem Ecology\, 
 UBT: Do invasive plants cheat? Impacts on biogeochemical cycles and ecosys
 tem functioning
TRANSP:TRANSPARENT
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