Population consequences of individual-level mechanisms through dynamic energy budgets Tjalling Jager Dept. Theoretical Biology

What is DEB? Quantitative theory for metabolic organisation; ‘first principles’ time, energy and mass balance Life-cycle of the individual links levels of organisation: molecule  ecosystems Kooijman (2000) Kooijman (in press)

Metabolic organisation foodfaeces reserves assimilation structure somatic maintenance  1-  maturity gametes maturity maintenance Traits: - growth curve - age at 1st repro - repro rate with age - feeding rates - … ?

for embryos … reserves structure somatic maintenance  1-  maturity maturity maintenance Traits: - egg size - hatching time - hatchling size - …

Scope of PhD project  How do effects at energy budget propagate to population level? emphasis on embryonic development  Organism: the pond snail (Lymnaea stagnalis)  Not specific for regulatory framework or chemical

Project structure  Proposed modelling approach: individual model: DEB3 model in Matlab population model: start with Euler-Lotka equation …  Experimental work: start from existing data at individual level additional experiments performed at INRA, France  Validation of population effects? not foreseen …  Practical application? demonstrate population consequences based on lit. data collaborate in DEB-2 project (INRA, France) with EDs

Vacancies Still looking for a CREAM PhD student … Courses International DEB Tele Course 2011 Symposia 2nd International DEB Symposium 2011 in Lisbon More information: Advertisement