Effects of current on the development of loosely and tightly attached layers in periphyton communities

Authors: Abe S-I.; Nagumo T.; Tanaka J.

Source: Phycological Research, Volume 48, Number 4, December 2000 , pp. 261-265(5)

Publisher: Blackwell Publishing

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Abstract:

SUMMARY

The growth rate and peak biomass of loosely and tightly attached layers in periphyton communities were measured in slow (39 cm s^–1), moderate (67 cm s^–1) and fast (137 cm s^–1) current regimens using experimental channels. The peak biomasses of the loosely and tightly attached layers were highest in the moderate and fast current regimens, respectively. The growth rate of the loosely attached layer was lower in the fast current regimen than in the other current regimens, however, there was no significant difference in the growth rates of the tightly attached layers. These results indicate that current restricts the biomass accumulation of the loosely attached layer in the slow and fast current regimens, and that biomass accumulation is highest in the moderate current regimen, while in the tightly attached layer the fast current regimen led to a maximization of the biomass.

Keywords: chlorophyll a; current; growth rate; loosely and tightly attached layers; peak biomass; periphyton

Language: English

Document Type: Research article

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