Chapter 29 Secondary Production of Macroinvertebrates

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Chapter 29 Secondary Production of
Macroinvertebrates
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Introduction

• Secondary Production formation of heterotrophic
  biomass through time
• I A F
• A P R U
• Where I ingestion, A assimilation,
• F food that is defecated(egestion),
• P production, R respiration, and
• U excretion

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Introduction Continued

• Growth
• How much is eaten
• How efficiently is food converted
• Efficiency
• Assimilation efficiency (A/I)
• 5 detritivores
• 90 carnivores
• Net production efficiency (P/A)
• 50 detritivores
• 50 carnivores

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Biomass Turnover and the P/B Concept

• Biomass (B) how much living tissue mass for a
  population is present at one instant in time
  (g/m2)
• Production (P) is a flow (g/m2time)
• P/B is a rate (1/time)
• Can be associated with individual or cohorts
• Cohort group or population

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Utility of Secondary Production in Ecosystem
Studies

• Studies of secondary production
• Levels of production
• Physical and biological control factors,
• Estimates for assessing aspects of bioenergetic,
  and performance of a population or interactions
  with other members of the community
• Used as a response variable in experimental
  studies
• Biotic interactions,
• Whole system manipulations, and
• Effects of land use on stream communities

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General Design

• Focused on specific habitat or a stream reach
• Requires many samples throughout the year

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Design Continued

• Density number of organisms in a given area
• Size-Structure density of individuals within
  each size class of a population
• Length-specific mass (mg) and Density (/area)
• Size specific biomass (mg/area)
• Population biomass sum of biomass for all sizes
• A lot of these measurements can be found in the
  Lit.

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Application
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Application