Record Details
Feeding rates and selectivity of adult Euphausia pacifica on natural particle assemblages in the coastal upwelling zone off Oregon, USA, 2010
ScholarsArchive at Oregon State University
| Field | Value |
|---|---|
| Title | Feeding rates and selectivity of adult Euphausia pacifica on natural particle assemblages in the coastal upwelling zone off Oregon, USA, 2010 |
| Names |
Du, Xiuning
(creator) Peterson, William (creator) |
| Date Issued | 2014-07 (iso8601) |
| Note | To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The article was published by Oxford University Press and is in the public domain. The published article can be found at: http://plankt.oxfordjournals.org/. |
| Abstract | 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. |
| Genre | Article |
| Topic | Euphausia pacifica |
| Identifier | 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 |
