Affiliation:
1. Belarusian State University, Minsk, Belarus
Abstract
Relationships between charophytes surface area and biomass were studied in oligo-mesotrophic Naroch Lake (Belarus). To determine the surface area of Charophytes the geometric similarity method was used, preceded by dividing the thallus into separate cylindrical fragments. The specific surface area (S/W) of chara algae was determined in different seasons and at different depths. Seasonal changes in specific surface area are weakly expressed. The average S/W value for the observation period (July 2018 – March 2020) was (194,3±29,6) sm2/ g dry weight (cv=15%). The specific surface area of charophytes grows slightly with increasing depth. There is a positive relationship between the dry mass and surface area of charophytes, which is satisfactorily described by the linear regression equation: y = 130,6x+134,1 (y – surface area, sm2; x – absolutely dry weight, g; R2=0,41; P<0,00000). The equation can be used to estimate the surface area of chara algae through the relatively easy determination of biomass in large-scale studies, or in the case of expert assessments, when high accuracy is not needed.
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