Microbial processes in a high-latitude fjord (Kongsfjorden, Svalbard) : II. Ciliates and dinoflagellates
| Autor: | Lena Seuthe, Fanny Narcy, Kriss Rokkan Iversen |
|---|---|
| Přispěvatelé: | Narcy, Fanny, University of Tromsø (UiT), Laboratoire d'océanographie de Villefranche (LOV), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut de la Mer de Villefranche (IMEV), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
0106 biological sciences
010504 meteorology & atmospheric sciences 01 natural sciences Zooplankton Arctic Algae Phytoplankton VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 14. Life underwater [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography 0105 earth and related environmental sciences Ciliate Carbon cycling Biomass (ecology) biology Agricultural and Biological Sciences(all) Ecology 010604 marine biology & hydrobiology Dinoflagellate Pelagic zone Food web Spring bloom VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497 biology.organism_classification Mesozooplankton Oceanography Microzooplankton General Agricultural and Biological Sciences |
| Zdroj: | Polar Biology Polar Biology, 2011, 34 (5), pp.751-766. ⟨10.1007/s00300-010-0930-9⟩ |
| DOI: | 10.1007/s00300-010-0930-9⟩ |
| Popis: | This paper is part of Lena Seuthe's doctoral thesis, which is available in Munin at http://hdl.handle.net/10037/3777 The composition and ecological role of ciliates and dinoflagellates were investigated at one station in Kongsfjorden, Svalbard, during six consecutive field campaigns between March and December 2006. Total ciliate and dinoflagellate abundance mirrored the seasonal progression of phytoplankton, peaking with 5.8 9 104 cells l-1 in April at an average chlorophyll a concentration of 10 lg l-1. Dinoflagellates were more abundant than ciliates, dominated by small athecates. Among ciliates, aloricate oligotrichs dominated the assemblage. A large fraction ([60%) of ciliates and dinoflagellates contained chloroplasts in spring and summer. The biomass of the purely heterotrophic fraction of the ciliate and dinoflagellate community (protozooplankton) was with 14 lg C l-1 highest in conjunction with the phytoplankton spring bloom in April. Growth experiments revealed similar specific growth rates for heterotrophic ciliates and dinoflagellates (\0–0.8 d-1). Food availability may have controlled the protozooplankton assemblage in winter, while copepods may have exerted a strong control during the post-bloom period. Calculations of the potential grazing rates of the protozooplankton indicated its ability to control or heavily impact the phytoplankton stocks at most times. The results show that ciliates and dinoflagellates were an important component of the pelagic food web in Kongsfjorden and need to be taken into account when discussing the fate of phytoplankton and biogeochemical cycling in Arctic marine ecosystems. |
| Databáze: | OpenAIRE |
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