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DEB-based body mass spectra. Bas Kooijman Dept theoretical biology Vrije Universiteit Amsterdam [email protected] http://www.bio.vu.nl/thb /. Marseille, 2007/01/17. Body mass spectrum. Derive it from:. Primary scaling relationships.

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deb based body mass spectra
DEB-based body mass spectra

Bas Kooijman

Dept theoretical biology

Vrije Universiteit Amsterdam

[email protected]

http://www.bio.vu.nl/thb/

Marseille, 2007/01/17

body mass spectrum
Body mass spectrum

Derive it from:

primary scaling relationships
Primary scaling relationships

assimilation {JEAm} max surface-specific assim rate  Lm

feeding {b} surface- specific searching rate

digestion yEX yield of reserve on food

growth yVEyield of structure on reserve

mobilization v energy conductance

heating,osmosis {JET} surface-specific somatic maint. costs

turnover,activity [JEM] volume-specific somatic maint. costs

regulation,defence kJ maturity maintenance rate coefficient

allocation  partitioning fraction

egg formation R reproduction efficiency

life cycle [MHb] volume-specific maturity at birth

life cycle [MHp] volume-specific maturity at puberty

aging ha aging acceleration

Kooijman 1986

J. Theor. Biol.

121: 269-282

maximum length Lm =  {JEAm} / [JEM]

metabolic rate 8 2 2
Metabolic rate 8.2.2

slope = 1

Log metabolic rate, w

O2 consumption, l/h

2 curves fitted:

endotherms

0.0226 L2 + 0.0185 L3

0.0516 L2.44

ectotherms

slope = 2/3

unicellulars

Log weight, g

Length, cm

Intra-species

Inter-species

(Daphnia pulex)

feeding rate 8 2 2
Feeding rate 8.2.2

slope = 1

Filtration rate, l/h

Mytilus edulis

Data: Winter 1973

poikilothermic tetrapods

Data: Farlow 1976

Length, cm

Inter-species: JXm V

Intra-species: JXm V2/3

spectrum definition
Spectrum definition
  • individuals follow standard DEB model in homogeneous environment
  • kM = kJ; no reproduction buffer
  • max lengths represent random trials from exponential distribution
  • individuals eat other individuals in length-range linked to own length
  • background mortality has constant hazard rate
  • individuals with length below threshold feed on producers (constant)
  • individuals with length below threshold feed on producers+consumers
  • with a linear preference shift between the two thresholds
trials from exponential distribution
Trials from exponential distribution

Suppose that mean = 1, else multiply result by mean

Expected value of the i-th ordered trial from a sample of size k

canonical community 9 4
Canonical community 9.4

Short time scale:

Mass recycling in a community

closed for mass

open for energy

Long time scale:

Nutrients leaks and influxes

Memory is controlled by

life span (links to body size)

Spatial coherence is controlled by

transport (links to body size)

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