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Citeable URL: http://ir.library.oregonstate.edu/concern/articles/1r66j273p

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Creator	Peterson, William Du, Xiuning
Abstract or Summary	Filtration by adult Euphausia pacifica was measured before and during the upwelling season, using both “disappearance of chlorophyll” and “disappearance of cells” techniques. Results show that feeding rates and selectivity varied with food assemblages. Filtration rate (F) was best modeled by the Ivlev function: the average F on total Chl-a was 92 mL euphausiid⁻¹ h⁻¹, and 119 mL euphausiid⁻¹ h⁻¹ on microscopy cell counts. F averaged 36 for the <5 µm size fraction of Chl-a, 94 for the 5–20 µm fraction and 107 mL euphausiid⁻¹ h⁻¹ for the >20 µm fraction. The average F values were 155 and 163 mL euphausiid⁻¹ h⁻¹ for chain-diatoms and single diatoms, respectively, and 115 and 137 mL euphausiid⁻¹ h⁻¹ for the <40 µm and >40 µm ciliates, respectively. Ingestion rates based on total Chl-a and size fractions, total cell counts and ciliates were significantly correlated using Hollings' models (P < 0.01). Maximum daily ration was 23% body C day⁻¹ when a high food concentration (700 µC L⁻¹) was available, but over the carbon range of 50–200 µg C L⁻¹, daily ration averaged 4% body C day⁻¹. Diatoms were consumed almost exclusively during blooms associated with summer upwelling events; larger types of ciliates and dinoflagellates were fed upon preferentially compared with their smaller counterparts.
Resource Type	Article
DOI	10.1093/plankt/fbu027
Date Available	2015-03-24T16:19:11+00:00
Date Issued	2014-07
Citation	Du, X., & Peterson, W. (2014). Feeding rates and selectivity of adult Euphausia pacifica on natural particle assemblages in the coastal upwelling zone off Oregon, USA, 2010. Journal of Plankton Research, 36(4), 1031-1046. doi:10.1093/plankt/fbu027
Series	Journal of Plankton Research July/August 2014 Vol. 36 no. 4
Keyword	Ingestion rate Phytoplankton Ciliate Euphausia pacifica Filtration rate
Rights Statement	Copyright Not Evaluated
Funding Statement (additional comments about funding)	This work was supported by the NOAA/MERHAB 2007 program project (NA07NOS4780195) (MOCHA); and the NOAA/CAMEO program (NA09NMF4720182). The research was part of the PhD Dissertation of Xiuning Du carried out with the support of the China Scholarship Council.
Publisher	Oxford University Press
Peer Reviewed	Yes
Language	English [eng]
Replaces	http://hdl.handle.net/1957/55405
Additional Information	description.provenance : Approved for entry into archive by Erin Clark(erin.clark@oregonstate.edu) on 2015-03-24T16:19:11Z (GMT) No. of bitstreams: 1 DuXiuningHMSCFeedingRatesSelectivity.pdf: 994290 bytes, checksum: 4ede7dd7831be46403ead4f9a7fd30b4 (MD5) description.provenance : Submitted by Erin Clark (erin.clark@oregonstate.edu) on 2015-03-24T16:18:53Z No. of bitstreams: 1 DuXiuningHMSCFeedingRatesSelectivity.pdf: 994290 bytes, checksum: 4ede7dd7831be46403ead4f9a7fd30b4 (MD5) description.provenance : Made available in DSpace on 2015-03-24T16:19:11Z (GMT). No. of bitstreams: 1 DuXiuningHMSCFeedingRatesSelectivity.pdf: 994290 bytes, checksum: 4ede7dd7831be46403ead4f9a7fd30b4 (MD5) Previous issue date: 2014-07

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