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Free Content Continuous and Nocturnal Feeding of the Marine Planktonic Copepod Calanus Helgolandicus

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Grazing and ingestion rates of continuously and nocturnally feeding late copepodids and adult females of Calanus helgolandicus were determined at 15°C. Grazing rates decreased with time when the copepods fed on chain-forming diatoms but remained constant when particles of uniform size were offered as food. Grazing and ingestion rates of female C. helgolandicus raised in the laboratory, a deep tank, and originating from the Pacific Ocean differed little when fed the same phytoplankton species at concentrations close to those found in the Pacific Ocean off La Jolla. Continuously and nocturnally feeding specimens of different origin increased their grazing rates when food concentrations decreased. The differences between mean ingestion rates of continuous and nocturnal feeders were insignificant.

Document Type: Research Article

Publication date: 1976-01-01

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  • The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.
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