Hochlagen 121

TipTree is divided in three workpackages:

WP 1 – Micro-evolutionary potential of tree populations in response to Global Change (GC)
Population response to new selection exerted by GC depends on the amount of genetic diversity at adaptive traits residing within populations (i.e. the standing genetic variation). Genomic technologies now  provide  the  opportunity  to  discover  the  genes  and  the  allelic  variants  in  these  genes  that underlie complex phenotypic traits on which selection acts. In this WP, we will first assess the levels of  diversity  at  gene  level,  and  characterize  selection  forces  causing  allele  frequency  changes between  generations  within  environment  and  across  environment  at  genes  underlying  adaptive traits. Then in a second step, we will assess levels of phenotypic diversity for putatively adaptive traits  and  characterize  selection  forces  on  these  traits,  based  on  traits  measured  in  native populations, reciprocal transplants or common garden experiments. 

WP  2Modeling  non-equilibrium  population  demographic  and  evolutionary  dynamics  and predicting the impact of GC, from local to regional scalesCC and habitat fragmentation are imposing profound pressures on forest ecosystems to adapt at rates that exceed those associated to past natural climate oscillations. The goal of this WP is to develop scenarios for the adaptive response of tree populations to GC and to identify environmental and  micro-evolutionary  tipping  points.  We  will  rely  on  a  new  generation  of  models  coupling geophysics,  biophysics,  population  dynamics  and  quantitative  genetics. The first  exploratory  step aims to characterize environmental stresses and major tree traits driving population demographic response  to  these  stresses  without  genetic  adaptation.  In  a  second  step  we  will  account  for  the levels of genetic diversity of these traits and for their response to selection.

WP 3Elaborating management scenarios and spreading knowledge
The originality of this WP is to tightly associated researcher and stakeholders in order to address two specific objectives.