Open AccessDistribution of picoplankton and detritus in the lower course of the Kama River
Author(s) -
Е. С. Краснова,
M. V. Umanskaya
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/818/1/012025
Subject(s) - picoplankton , abundance (ecology) , biomass (ecology) , detritus , autotroph , plankton , environmental science , ecology , atmospheric sciences , biology , phytoplankton , nutrient , physics , bacteria , genetics
The distribution of picoplankton and detritus in the lower course of the Kama River in 2009, 2012, 2016 and 2020 was analyzed. The abundance (1.5-6.7 × 10 6 cells mL −1 ) and biomass (25-173 u g C L −1 ) of picoplankton corresponds to the mesotrophic level. The abundance and biomass of the heterotrophic picoplankton increases from spring to autumn, the autotrophic picoplankton has maximum in August. The amount (17-1367 × 10 3 particles mL −1 ) and mass (0.1-62 μg C L −1 ) of picodetritus varies greatly from station to station without clear patterns, but basically its mass is higher at coastal stations. Heterotrophic picoplankton prevails in picoseston structure; the average APP and picodetritis contributions are comparable, with little excess of picodetritus. The structure of the picoseston varies significantly depending on the season and the riverbed or the coastal location of the station. The amount of nanodetritus is very high (up to 229 × 10 3 particles mL −1 and 662 μg C L −1 ), and it varies slightly both in space and in time. Its mass is almost always several times higher than the biomass of picoceston Most likely, nanodetritus is one of the main factors affecting the plankton of the lower course of the Kama River.