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JPR Advance Access published online on June 22, 2005
Journal of Plankton Research, doi:10.1093/plankt/fbi039
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org
Received March 13, 2005
Accepted June 10, 2005

Article

Grazing by the calanoid copepod Neocalanus cristatus on the microbial foodweb in the coastal Gulf of Alaska

Hongbin Liu 1, Michael J. Dagg 1*, and Suzanne Strom 2

1 Louisiana Universities Marine Consortium 8124 Hghway 56 Chauvin, LA 70344
2 Shannon Point Marine Center Western Washington University 1900 Shannon Point Rd. Anacortes, WA 98221

* To whom correspondence should be addressed.
Michael J. Dagg, E-mail: mdagg{at}lumcon.edu


  Abstract

Neocalanus cristatus feeding on phytoplankton and microzooplankton was measured in the coastal Gulf of Alaska during spring and early summer of 2001 and 2003. N. cristatus CV fed primarily on particles > 20 µm. Particles in the 5 - 20 µm size range were ingested in some experiments under non-bloom conditions but not under bloom conditions. Particles < 5 µm were not ingested but increased during incubations because N. cristatus consumed their microzooplanktonic predators. N. cristatus are sufficiently abundant in nature to induce such a cascade effect in situ. Microzooplankton provided more than 70% of the carbon ingested by N. cristatus under non-bloom conditions but only about 30% under bloom conditions. N. cristatus ingested about 2 times more carbon under bloom conditions (average 21.4 µg C cop-1 d-1) than under non-bloom conditions (average 10.0 µg C cop-1 d-1) but these rates were inadequate to meet nutritional demands for growth and metabolism, estimated to be between 40 and 140 µg C cop-1 d-1. We believe our ingestion rates are underestimates of in situ rates because (1) we are underestimating consumption rates of large particles, (2) we may not be including some very large particles that should be considered as diet items, and (3) we are not properly accounting for the ingestion of aggregates. The feeding behavior of N. cristatus, one of the most abundant copepods in the North Pacific Ocean, remains incompletely understood.


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