Population models for carbonate workbench
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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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