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From April 1994 to December 1997, we studied the microphytobenthic assemblages in surface(0 to 0.5 cm) and subsurface (0.5 to 2 cm) sediments at spring low tide along a transect of 5 stationsin an estuarine sandflat of the Seto Inland Sea, Japan. At the innermost sampling station, microphytobenthosbiomass (chl a) was also investigated in a vertical profile to 10 cm depth from December 1994to April 1996. The chl a contents at the 2 uppermost layers were well correlated with each other, with amean decrease of 34% from the surface to subsurface layer. Chl a tended to decrease rapidly throughthe vertical profile and was reduced to 3.2 ± 1.4% SD in the 9 to 10 cm layer. There was a progressive decreasein the chl a content every year in fall and the occurrence of major peaks in early spring and/orsummer. This was accompanied by a significant increase in microphytobenthos biomass from 1994 to1995 and from 1995 to both 1996 and 1997. The microphytobenthos biomass in surface sediments (meanof 5 stations) ranged between 27.7 (October 1994) and 120 mg chl a m–2 (July 1997), or between 3.9(November 1994) and 20.3 μg chl a g–1 dry wt (July 1996). Annual mean (1995 to 1997) biomass was72.3 ± 27.1 mg chl am–2 and 11.0 ± 4.3 μg chl a g–1 dry wt. These values rank in the mid-upper range ofmicrophytobenthic biomass for intertidal sediments. In addition to the field investigations, we conductedlaboratory experiments on a dominant diatom species, Navicula sp. The photosynthetic rate of Naviculasp. was saturated at a light intensity of 165 μE m–2 s–1 at 21°C. No photoinibition was found at higherlight intensities up to 400 μE m–2 s–1. The relationship between temperature and photosynthetic rate waspositive and linear within a temperature range between 10 and 35°C at 55 μE m–2 s–1. Areal ‘potential’primary production of microphytobenthos was between 0.32 (December 1994) and 3.0 gC m–2 d–1 (July1997), with an annual mean of 1.2 gC m–2 d–1. Uni- (summer) or bi-modal (spring and summer) peaks ofmicrophytobenthos biomass and primary production highlighted a marked interannual variability.Marked seasonal patterns were also recognizable, with primary production of microphytobenthossignificantly higher both in spring and summer than in winter and fall

Seasonal and interannual patterns of intertidal microphytobenthos in combination with laboratory and areal production estimates