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Production of Ruppia cirrhosa (Petagna) Grande in mixed beds in Ringkøbing Fjord (Denmark)
Kiørboe, T. (1980). Production of Ruppia cirrhosa (Petagna) Grande in mixed beds in Ringkøbing Fjord (Denmark). Aquat. Bot. 9(2): 135-143
In: Aquatic Botany. Elsevier Science: Tokyo; Oxford; New York; London; Amsterdam. ISSN 0304-3770, more
Peer reviewed article  

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Keywords
    Biomass; Primary production; Ruppia cirrhosa (Petagna) Grande, 1918 [WoRMS]; Brackish water

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  • Kiørboe, T., more

Abstract
    Maximum biomasses of R. cirrhosa of 10 and 17 g dry wt/m-2 were reached in late June, followed by a distinct decline, in two mixed beds with a massive development of epiphytes. In a third mixed bed, which lacked noticeable epiphytes, a maximum biomass of 28 g dry wt /m-2 was reached by early September. Maximum biomasses of macrophytes other than R. cirrhosa were 104, 84 and 57 g dry wt /m-2 , respectively. Loss of leaves during the growing season was quantified. At the epiphyte-free station loss of leaves was considerably less than at the other two stations. Annual net production was estimated as 57 g dry wt/m-2 at the epiphyte-free station, and at the two other stations as 12 and 27 g dry wt/m-2 , respectively. Ratios of annual net production to maximum biomass (P /B) were found to vary between 1.2 and 2.0, with the higher value for the epiphyte-free population. Differences in phenology and turnover rates between stations are apparently due to the inhibitory effects of epiphytes.

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