Reserve dynamics social interactions in feeding Bas Kooijman
Reserve dynamics & social interactions in feeding Bas Kooijman Dept theoretical biology Vrije Universiteit Amsterdam Bas@bio. vu. nl http: //www. bio. vu. nl/thb Amsterdam 2005/08/15
Evolution of DEB systems
Reserve dynamics
Polymerization inhibition catabolism maintenance growth
Structural homeostasis reserve structure E V on usu to al ge ny Enzymes at interface that mobilize reserves don’t “observe” grain size or substrate conc. No dilution by growth
Volume-surface interactions Membrane-mediated transformation rates in isomorphs decrease with length because of transportation distance inactive enzyme in binding phase active enzyme in production phase substrate product Cells can “know” their size from the rate at which concentrations of substrate & product change if transformation is by membrane-bound enzymes
RNA/dry weight, μg. μg-1 scaled elongation rate Protein synthesis 7. 5 Data from Koch 1970 Data from Bremer & Dennis 1987 spec growth rate, h-1 scaled spec growth rate RNA = w. RV MV + w. RE ME dry weight = wd. V MV + wd. E ME
No age, but These gouramis are from the same nest, size: they have the same age and lived in the same tank Social interaction during feeding caused the huge size difference Age-based models for growth are bound to fail; growth depends on food intake Trichopsis vittatus :
Rules for feeding
Social interaction Feeding length reserve density determin expectation time 1 ind 2 ind length reserve density time
- Slides: 10