Reserve dynamics & social interactions in feeding
Bas KooijmanDept theoretical biology
Vrije Universiteit [email protected]
http://www.bio.vu.nl/thb
Amsterdam2005/08/15
Evolution of DEB systems
Reserve dynamics
Polymerization inhibitionmaintenance growth
catabolism
Structural homeostasis
usualontogeny
V
E
Enzymes at interface that mobilize reserves don’t “observe” grain size or substrate conc.No dilution by growth
3/1interface EV
structure
rese
rve
Volume-surface interactions
inactive enzyme
active enzyme in binding phase
active enzyme in production phase
product
substrate
Cells can “know” their size from the rate at which concentrations of substrate & product change if transformation is by membrane-bound enzymes
Membrane-mediated transformation ratesin isomorphs decreasewith length because oftransportation distance
Protein synthesis 7.5
spec growth rate, h-1 scaled spec growth rate
RN
A/d
ry w
eigh
t, μg
.μg-1
scal
ed e
long
atio
n ra
te
Data from Koch 1970Data from Bremer & Dennis 1987
RNA = wRV MV + wRE ME
dry weight = wdV MV + wdE ME
: These gouramis are from the same nest, These gouramis are from the same nest, they have the same age and lived in the same tank they have the same age and lived in the same tankSocial interaction during feeding caused the huge size differenceSocial interaction during feeding caused the huge size differenceAge-based models for growth are bound to fail;Age-based models for growth are bound to fail; growth depends on food intake growth depends on food intake
No age, but No age, but size:size:
Trichopsis vittatus
Rules for feeding
Social interaction Feeding
time
time time
rese
rve
dens
ityre
serv
e de
nsity
leng
thle
ngth
time 1 ind
2 ind
determinexpectation