Effect of temperature on lower feeding thresholds, gut evacuation rate, and diel feeding behavior in the copepod Acartia hudsonica

Document Type

Article

Date of Original Version

1-1-1992

Abstract

Lower feeding thresholds of 280, 127, 282, and 214 cells ml-1 respectively at 4, 8, 12, and 16°C were indicated. The thresholds corresponded to carbon concentrations of 30.5, 11.6, 20.7, and 16.4 μg C l-1, and were not significantly different at the four temperatures. Highest gut contents occurred at night, and were c4-fold higher than the lowest measured gut contents. Total daily ingestion rates were respectively 11 460 and 14 430 cells d-1, or 1.34 and 2.40 μg C and 0.24 and 0.42 μg N d-1, and 33.4 and 56.5 body C and 23.3 and 38.5 body N d-1. The instantaneous gut evacuation rates had mean values of 0.0239, 0.0494, 0.0518 and 0.0645 min-1 respectively at 4, 8, 12, and 16°C, yielding a Q10 of 1.88. -from Authors

Publication Title, e.g., Journal

Marine Ecology Progress Series

Volume

85

Issue

1-2

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