Seasonal variation in primary production of microphytobenthos at the Isshiki intertidal flat in Mikawa Bay |
| |
Authors: | N Goto O Mitamura H Terai |
| |
Institution: | (1) Institute for Hydrospheric-Atmospheric Sciences, Nagoya University, Chikusa-ku, Nagoya 464-0814, Japan Fax +81-52-789-3436 e-mail: nao@ihas.nagoya-u.ac.jp, JP;(2) Limnological Laboratory, School of Environmental Science, University of Shiga Prefecture, Hikone, Japan, JP |
| |
Abstract: | Seasonal variations in photosynthetic rates by microphytobenthos and phytoplankton at the Isshiki tidal flat in Mikawa Bay
were measured with a 14C combustion method. In addition, diurnal variations in the photosynthetic rate and photosynthesis versus irradiance (P-I)
curves were obtained through in situ incubation. The photosynthetic rate of microphytobenthos (annual average, 13.9 ± 6.4
mg C m−2 h−1) did not show a remarkable change, and they maintained a higher production rate than phytoplankton (annual average 9.0 ±
5.1 mg C m−2 h−1) throughout the year. The P-I curves from in situ experiments showed that the photosynthetic activity of microphytobenthos
at the laboratory irradiance (250 μE m−2 s−1) was 56% of that at the maximum irradiance (1200 μE m−2 s−1) in situ. In the in situ experiments, the chlorophyll a concentration, photosynthetic rate, and activity of microphytobenthos varied greatly throughout the day, influenced by tidal
submersion/emersion and daylight. From an analysis of these results, it is considered that microphytobenthos contributed greatly
to primary production in this ecosystem throughout the year by adapting suitably to intertidal environments.
Received: July 28, 1999 / Accepted: October 10, 1999 |
| |
Keywords: | Microphytobenthos Photosynthesis Seasonal and diurnal variation P-I curve |
本文献已被 SpringerLink 等数据库收录! |
|