Ocean Science Journal

, Volume 45, Issue 2, pp 101–111

Feeding selectivity of calanoid copepods on phytoplankton in Jangmok Bay, south coast of Korea

  • Min-Chul Jang
  • Kyoungsoon Shin
  • Tongsup Lee
  • Il Noh
Article

Abstract

Grazing impacts of calanoid copepods on size-fractionated phytoplankton biomass [chlorophyll (Chl)-a] were measured in Jangmok Bay, Geoje Island, Korea, monthly from November 2004 to October 2005. The ingestion rate of calanoid copepods on total phytoplankton biomass ranged between 1 and 215 ng Chl-a copepod−1 day−1 during bottle incubations. Results indicated that microphytoplankton (> 20 μm) was the primary food source for calanoid copepods in grazing experiments on 3 phytoplankton size categories (< 3 μm, 3–20 μm, and > 20 μm). The ingestion rate on microphytoplankton showed a significant increase (r = 0.93, p < 0.01) with Chl-a concentration. Nanophytoplankton (3–20 μm) showed a negative ingestion rate from June 2005 to October 2005, but the reason is not completely understood. Calanoid copepods were unable to feed efficiently on picophytoplankton (< 3 μm) due to unfavorable size. Calanoid copepods removed between 0.1% and 27.7% (average, 3.6 ± 15.8%) of the phytoplankton biomass daily during grazing experiments. Grazing pressure was high in winter and early spring (January–March: 15.6–27.7%), while low in summer (June–August: −33.1–0.0%) and autumn (September–November: −1.4–5.1%). Results suggest that calanoid copepods play an important role in controlling the biomass and size structure of phytoplankton in winter and early spring.

Key words

calanoid copepods grazing Jangmok Bay 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Copyright information

© Korea Ocean Research & Development Institute (KORDI) and the Korean Society of Oceanography (KSO) and Springer Netherlands 2010

Authors and Affiliations

  • Min-Chul Jang
    • 1
  • Kyoungsoon Shin
    • 1
  • Tongsup Lee
    • 2
  • Il Noh
    • 3
  1. 1.South Sea Research InstituteKORDIGeojeKorea
  2. 2.Division of Earth Environmental SystemPusan National UniversityBusanKorea
  3. 3.Division of Marine Environment & BioscienceKorea Maritime UniversityBusanKorea

Personalised recommendations