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| Titel |
Community and herbivorous activity of heterotrophic protists in the western boundary of Canada Basin during the early summer, Arctic Ocean |
| VerfasserIn |
Eun-Jin Yang, Ho-Kyung Ha, Kyung-Ho Chung, Sun-Young Kim |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250046262
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| Zusammenfassung |
| During July/August 2010, we measured heterotrophic protistan grazing impacts on
phytoplankton growth rate and community structure in the vicinity of western boundary of
Cananda Basin using the icebreaker R/V Araon. A variety of environmental condition and
trophic condition were encountered, from free sea-ice cover to heavy sea-ice cover, and from
low chlorophyll-a (< 0.1 ug L-1) to diatom blooming (> 3 ug L-1). The community of
heterotrophic protists was dominated by naked ciliates and heterotrophic dinoflagellates.
Ciliates dominated in eddy-out and HDF dominated in eddy-in site. Heterotrophic
protistan biomass and size structure matched with the chlorophyll-a concentration and
size-fraction.
Phytoplankton growth rate varied from 0.13 to 1.81 d-1, on average 0.72 d-1. Grazing
rate of heterotrophic protistan varied from 0.12 to 1.52 d-1, on average 0.64 d-1. Grazing
rate was significantly correlated only to phytoplankton growth rate (p < 0.001), and not to
initial chlorophyll-a concentration or other measured environmental factors. Heterotrophic
protists grazed from 19.1 to 181.4% (average 92.1%) of daily chlorophyll-a production and
from 11.3 to 79.4% (average 43.0%) of initial standing stock. In this study site, heterotrophic
protisan grazing and phytoplankton growth were high compared to rates reported summer
2004 in western Arctic Ocean. Community of heterotrophic protist is clearly important in
determining the fate of phytoplankton during the early summer in the study area. |
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