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Microzooplankton community structure and grazing impact on major phytoplankton in the Chukchi sea and the western Canada basin, Arctic ocean

Cited 4 time in scopus
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Title
Microzooplankton community structure and grazing impact on major phytoplankton in the Chukchi sea and the western Canada basin, Arctic ocean
Other Titles
북극해의 척치해와 캐나다 서부 분지에서 주요 식물성 플랑크톤에 영향을 미치는 소형동물플랑크톤의 섭식압과 군집구조
Authors
Yang, Eun Jin
Kang, Sung-Ho
Ha, Ho Kyung
Keywords
Canada Basin; Chukchi Sea; Grazing rate; Growth rate; Microzooplankton
Issue Date
2015
Citation
Yang, Eun Jin, Kang, Sung-Ho, Ha, Ho Kyung. 2015. "Microzooplankton community structure and grazing impact on major phytoplankton in the Chukchi sea and the western Canada basin, Arctic ocean". DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY, 120(1): 91-102.
Abstract
Weinvestigatedthemicrozooplanktoncommunityanditsgrazingimpactonmajorphytoplankton groups intheChukchiSeaandinthewesternCanadaBasinduringtheperiodJuly?August2010.The study areawasdividedintothreeregionsbasedontopography,hydrographicpropertiesandtrophic conditions: (1)aproductiveregionovertheChukchiSeashelf(CSS)withhighphytoplanktonbiomass dominated bydiatoms,(2)anoligotrophicregionovertheNorthwindAbyssalPlain(NwAP)withlow phytoplanktonbiomassdominatedbypicophytoplankton,and(3)theNorthwindRidge(NwR),over which watersweredominatedbypicophytoplanktonanddiatoms.Thespatialdistributionofmicro- zooplankton biomassanditscompositionwererelatedtodifferencesinphytoplanktonbiomassand assemblage compositioninthethreewatermasses.Heterotrophicdinoflagellates(HDF)andciliates weresignificant componentsofmicrozooplanktonpopulations.AthecateHDFwasthemostimportant component intheCSS,wherediatomsweredominant.Nakedciliatesweredominantmicrozooplankton in theNwR.Microzooplanktongrazingratevariedbytheassemblagecompositionofbothphytoplankton and microzooplankton.Microzooplanktonwascapableofconsuminganaverageof71.7717.2%ofdaily phytoplanktonproduction.Growthratesofsmallerphytoplankton(i.e.,picophytoplanktonandauto- trophic nanoflagellates)andgrazingratesonthemwerehigherthanratesfordiatoms.Microzooplank- ton grazedmoreonpicophytoplankton(PPgrazed=89.3720.5%) andautotrophicnanoflagellates (PP grazed=82.3722.5%) thanondiatoms(PPgrazed=62.5720.5%). Thedynamicsofpredatorand preypopulationswerealmostbalancedinwatersinwhichsmallerphytoplanktonsweredominant. Picophytoplanktonproductionwasconsumedbymicrozooplanktonallowingtransfertolargercon- sumers. Onaverage,microzooplanktongrazed62.5%ofthediatomproductioninthewaterswestudied, indicating thattheclassicalfoodchain(withcarbon flux fromdiatomstocopepods)islikelyoperational and ofsignificance inthisregion.Overall,microzooplanktongrazingwasanimportantprocess controlling phytoplanktonbiomassandcompositionintheChukchiSeaandthewesternCanadaBasin during earlysummer.
URI
http://repository.kopri.re.kr/handle/201206/7379
DOI
http://dx.doi.org/10.1016/j.dsr2.2014.05.020
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