Mesoscale distribution of protozooplankton communities and their herbivory in the western Scotia Sea of the Southern Ocean during the austral spring SCIE SCOPUS

Cited 19 time in WEB OF SCIENCE Cited 19 time in Scopus
Title
Mesoscale distribution of protozooplankton communities and their herbivory in the western Scotia Sea of the Southern Ocean during the austral spring
Author(s)
Yang, Eun Jin; Hyun, Jung-Ho; Kim, Dongseon; Park, Jisoo; Mang, Sung-Ho; Shin, Hyoung Chul; Lee, SangHoon
KIOST Author(s)
Kim, Dong Seon(김동선)
Publication Year
2012-10-01
Abstract
The distribution and structure of protozooplankton communities and the impact of their grazing on phytoplankton during spring were studied as part of the 15th Korean Antarctic Research Program in the western Scotia Sea. Water mass identities were determined based on physicochemical properties, with four regions identified: north of the Polar Front (NPF), Polar Front (PF), South of the Polar Front (SPF), and the South Antarctic Circumpolar Current region (SACCr). Physicochemical characteristics of the water column significantly influenced the distribution and structure of phytoplankton and protozooplankton communities. The NPF was characterized by relatively warmer water, low nutrient, low chlorophyll a (chla), and pico-sized phytoplankton predominance (i.e., cyanobacteria and eukaryotic picoflagellates). Nano-sized phytoplankton such as Phaeocystis antarctica and Cryptomonas sp. dominated in the SACCr with its colder water, higher nutrient, and higher chla concentrations. Despite the relatively slightly high chla concentration in the PF, micro-sized phytoplankton, especially diatoms, were abundant. Large changes in protozooplankton biomass and community were observed between water masses. Heterotrophic nanoflagellates including choanoflagellates and nanociliates declined in abundance from the NPF to SACCr, whereas heterotrophic dinoflagellates (HDF) and microciliates increased in abundance from the NPF to SACCr. Ciliates declined in importance from the NPF to SACCr, accounting for over 50% of the total protozooplankton biomass in the NPF. In contrast, HDF comprised over 50% of the total in the SPF, PF, and SACCr. The depth-integrated protozooplankton biomass ranged from 443.2 to 934.0 mg C m(-2), and was highest in the PF and lowest in the NPF. These relationships suggest that the spatial variation in the community and biomass of protozooplankton appears to be primarily governed by the community and size structure of phytoplankton. Protozooplankton consumed an average of 76.9% of daily phytoplankton production. Therefore, protozooplankton were the major consumers of the diverse phytoplankton community, and protozooplankton, grazing is one of the most important loss processes affecting phytoplankton biomass and composition during spring in the western Scotia Sea. Crown Copyright (C) 2012 Published by Elsevier B.V. All rights reserved.
ISSN
0022-0981
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/3440
DOI
10.1016/j.jembe.2012.05.018
Bibliographic Citation
JOURNAL OF EXPERIMENTAL MARINE BIOLOGY AND ECOLOGY, v.428, pp.5 - 15, 2012
Publisher
ELSEVIER SCIENCE BV
Subject
ANTARCTIC POLAR FRONT; MARGINAL ICE-ZONE; ATLANTIC SECTOR; GRAZING IMPACT; WEDDELL SEA; MICROBIAL COMMUNITY; CIRCUMPOLAR CURRENT; PHYTOPLANKTON GROWTH; DILUTION EXPERIMENTS; COASTAL WATERS
Keywords
Antarctic; Dilution method; Grazing rate; Protozooplankton; Western Scotia Sea
Type
Article
Language
English
Document Type
Article
Publisher
ELSEVIER SCIENCE BV
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