A study on the variations in phytoplankton species composition and biomass in relation to N/P gradients in mesocosms

Title
A study on the variations in phytoplankton species composition and biomass in relation to N/P gradients in mesocosms
Author(s)
김선주; 장풍국; 장민철; 이재도; 신경순; 장만
KIOST Author(s)
Jang, Pung Guk(장풍국)Shin, Kyoungsoon(신경순)
Publication Year
2002-11-15
Abstract
The effects of gradients of inorganic nutrient input on coastal phytoplankton communities were investigated for 2 weeks in June 2002, in the Jangmok marine station of KORDI. This experiment was conducted in 8 mesocosm units consisting of 2.5 m3 polyethlylene bags. The nitrogene (N) input established a N/P ratio gradient among the mesocosms : 2, 4, 8, 16, 24, 32 and 64. The response of phytoplankton biomass and species composition after addition the nutrients in mesocosms was examined in comparision to a mesocosm unit which no nutrient were added. The biomass of the phytoplankton communities increased to a maximum 17.9 ㎍ chlorophyll a l-1 (10-fold above the mean initial value) in the mesocosm unit that N/P ratio gradient was 24/1, on Day 3. The biomass increase was largely attributable to bloom of Raphidophyceae Heterosigma akashiwo in all mesocosms during the early phase of the experiment. The decline of the Heterosigma akashiwo bloom occurred together with the development of flagellates Chroomonas sp. toward the end of the experiment when P was limiting. Consiquently, results from this experiment suggest that the high N/P ratio activated the limitation by another nutrient and induced a shift of phytoplankton species dominance from an initial dominace of nanoplankton to dominace of picoplankton.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/32391
Bibliographic Citation
2002 추계 학술발표대회, pp.139, 2002
Publisher
한국해양학회
Type
Conference
Language
English
Publisher
한국해양학회
Related Researcher
Research Interests

Plankton ecology and physiology,Risk assessment,Ship ballast water,플랑크톤 생리, 생태,위해성평가,선박평형수

Files in This Item:
There are no files associated with this item.

qrcode

Items in ScienceWatch@KIOST are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse