Mesozooplankton community structure、temporal variation as well as grazing impact on phytoplankton in the coastal sea of northern Taiwan
Date Issued
2004
Date
2004
Author(s)
Tsai, Chi-Fang
DOI
zh-TW
Abstract
This study sampled at the water entrance of Taipower station weekly between 2001/11 to 2004/5. Variations in temperature（17.7-29.9℃）, chl-a（0.14-2.02 μgChl l-1）, primary production（0.01-141.7 mgC m-3 d-1）and zooplankton abundance（63-34881 ind. m-3）demonstrated a seasonal pattern with higher values recorded in warm season（May-Oct）and lower values in cold season（Nov-Apr）. Correlation analysis indicated that temperature, chl a and primary production was significantly correlated to each other. There are two weeks lag between total zooplankton abundance and chl-a concentration, and showed a prey-predator relationship. Throughout the study microzooplankton were dominated by copepods which comprised >92% of total zooplankton abundance；The most dominant species is calanoida which comprised 46% of total zooplankton abundance. There was a significantly difference on total zooplankton abundance between warm season（902-34881 ind. m-3）and cold season（63-3366 ind. m-3）. There was no annual variation on total zooplankton abundance in warm season. Except for Harpacticoida, there were annual variation on total zooplankton abundance and other three major copepod in cold season. Zooplankton specific grazing rate（0.02-0.39 μgC ind.-1 d-1）was significantly correlated to chl-a concentration. The temperature control experiments showed that in the same situation on chl-a, raise the temperature for 5-10℃ can enhance the specific grazing rate to 3-6 fold. Used the regression equation between zooplankton specific grazing rate and chl-a concentration（SGR＝-0.08+0.25×Chl-a）to estimate the zooplankton community grazing impact on phytoplankton showed the maximum grazing impact can consumed 63% of daily primary production（8.6 mgC m-3 d-1）in warm season. The mean value of zooplankton community grazing impact on primary production is 5%, lower than the value of other study area. Maybe the reason is: this study area has higher bacteria production（BP/PP=12）and POC concentration（mean=115 mg m-3）. Alternative carbon sources may be utilized.
Subjects
橈足類
攝食
浮游動物
zooplankton
grazing
copepod
Type
thesis
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