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Invertebrate Predators

Invertebrate Predators. L. Madin, E. Horgan, B. Sullivan, S. Bollens GLOBEC Georges Bank Science Meeting Nov. 19, 2003. Predation Mortality Calculation. Plot abundance maps per predator, depth, month, year. 5 standard regions, 3 depth ranges Add distribution of prey

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Invertebrate Predators

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  1. Invertebrate Predators L. Madin, E. Horgan, B. Sullivan, S. Bollens GLOBEC Georges Bank Science Meeting Nov. 19, 2003

  2. Predation Mortality Calculation • Plot abundance maps per predator, depth, month, year. • 5 standard regions, 3 depth ranges • Add distribution of prey • Predator abundance x feeding rate = Predation Capacity for each station • Adjust Predation Capacity for temperature effect & prey selection  to models • Divide Predation Capacity by target prey abundance for Instantaneous Mortality • Sum Instantaneous Mortality values for all co-occurring predators = total predation impact per prey species

  3. Estimates of Predation MortalityMay, 1995

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