Mortality by Gelatinous Zooplankton

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Presentation transcript:

Mortality by Gelatinous Zooplankton Goals: To estimate predation rates of Mnemiopsis leidyi Chrysaora quinquecirrha from depth-specific Tucker Trawls

Predation Rate Calculations Estimate individual ingestion rates for Mnemiopsis using Purcell et al. 2001: CMnem =11.22X 0.5413 where X is ctenophore wet weight (g) and CMnem is the volume of A. tonsa cleared (liters cleared ctenophore-1 d-1) 2) Estimate population clearance rate (liters cleared m-3 d-1) by multiplying Cmnem by ctenophore density (no. m-3)

Predation Rate Calculations Estimate individual sea nettle ingestion rate using Purcell (1992) equation: logY =0.85log X1 +1.43log X 2 +3.96log X3 −6.43, where Y is copepods eaten (no. medusa-1 d-1), X1 is copepod density (no. l-1), X2 is sea nettle bell (mm), X3 is temperature (°C) 2) Convert to population ingestion rate (no. copes eaten m-3 d-1) by multiplying by the sea nettle density (no. m-3).

Gelatinous Zooplankton Abundance Nemopsis bachei Beroe ovata Aurelia labiata Chrysaora quinquecirrha Mnemiopsis leidyi Cyanea capillata

Jelly Abundance

Mnemiopsis clearance

Done: Mnemiopsis abundance & volumes by layer Chrysaora abundance & volumes by layer Mnemiopsis population clearance rates To do: Convert Mnemiopsis clearance rates to ingestion of A. tonsa per layer (need copepod densities by layer) Estimate A. tonsa ingestion by Chrysaora (need copepod densities & temperatures by layer)