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Population Models for Carbonate Workbench. Static Environmental context – productivity Dynamic Population context – community linkages Basic / inefficient Optimized. Scoping. Volterra-Lotke. Simplest: Intrinsic rates of increase of prey:a, density related

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population models for carbonate workbench

Population Models for Carbonate Workbench

  • Static Environmental context – productivity
  • Dynamic Population context – community linkages
      • Basic / inefficient
      • Optimized

Scoping

volterra lotke
Volterra-Lotke
  • Simplest:
    • Intrinsic rates of increase of prey:a, density related
    • Predation rates:b, conversion:c to prey offspring, density- related
    • Mortalities:m
    • & Environmental homogeneity (hiding places)
    • & Competition

H, herbivore population

C, Consumer population

  • Practical:
    • Numerical solutions
    • Limits to complexity

H

C

ecopath
Ecopath
  • Production = catch + predation + net migration + biomass accumulation + other mortality
  • Consumption = production + respiration + unassimilated food

Parameters needed (raw or estimated): biomass, production/biomass ratio (or total mortality), consumption/biomass ratio, and ecotrophic efficiency for each of the functional groups in a model

path model
Path Model

Trophic energy flows => population and growth rates

Lots of information from ecologists, reef studies, carbon biogeochemists

We can use guilds (as zoologists do) for palaeo-communities

  • For example:
  • Trophic web
  • Sessile / vagrant
  • Soft / Skeletonized
  • Hetero- / Autotroph
  • R/K strategies
  • Feeding scales
  • Grazing/Filter/Predator
  • Framework / Encrusting / Interstitial
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