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DTSTART:20111030T030000
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RDATE:20121028T030000
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DTSTAMP:20260805T072110Z
DESCRIPTION:In a recent paper in Journal of Biogeography (June 2008)\, we p
 resented a theoretical model of rates of immigration\, extinction\, and sp
 eciation on oceanic islands as a function of island ontogeny (life cycle).
  The central premise of the model is that the ecological capacity of remot
 e volcanic islands typically describes a hump shaped trend as an island gr
 ows to maturity and then declines through erosion and subsidence\, eventua
 lly disappearing again. The model generates several predictions for emerge
 nt biogeographical patterns within archipelagos comprised of such islands\
 , focusing on numbers and proportions of endemics\, relative importance of
  adaptive and non-adaptive processes\, etc. Here we (i) outline the key pr
 operties of this general dynamic model\, and (ii) present some additional 
 tests of the model using snapshot data based on numbers of endemic species
 .\nThe increase of species richness as sampling area increases\, i.e. the 
 species–area relationship\, is one of ecology’s few laws. Thousands of stu
 dies have reported the pattern\, for more than 91 years but still necessit
 y for synthesizing the available knowledge exists. We conducted the most e
 xtensive quantitative analysis of the form taken by the island species–are
 a relationship (i.e. each data point is tallied independently of every oth
 er and so the form of the relationship can vary\; ISAR). We amassed 601 da
 ta sets from strictly geographical islands and employed an information-the
 oretic framework to compare the 20 available species–area functions. Overa
 ll\, we conclude that over most scales of space\, ISARs are best represent
 ed by simple models\, with the power model\, being the overall best but no
 t the single-best one. Biological significance can be assigned to the para
 meters of the logarithmic form of the power model. The general form of the
  ISAR is convex upwards without an asymptote\; consideration may be given 
 to fitting sigmoid models when the spatial range is around\, or exceeds\, 
 three orders of magnitude. While the form of the ISAR varies considerably 
 between study systems\, part of this variation can reasonably be related t
 o the array of different mechanisms and processes that constrain the ecolo
 gical space available within an island system and the geographical context
  within which the archipelago is located.
DTSTART;TZID=Europe/Berlin:20111109T140000
DTEND;TZID=Europe/Berlin:20111109T235959
LOCATION:H6 (GEO)
SUMMARY:Dr. Kostas Triantis\, Department of Ecology and Taxonomy\, National
  and Kapodistrian University of Athens (Homepage): Biodiversity patterns o
 n islands: a general dynamic model and the island species–relationship
TRANSP:TRANSPARENT
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