Population dynamics of the glacial relict amphipod Monoporeia affinis in a subarctic lake

Seasonal and interannual (2002–2019) variations in the abundance (ind. m-2) and population structure of the glacial relict amphipod Monoporeia affinis in a small subarctic Lake Krivoe (North-West of the Russian Federation) are presented. The study site (66⁰ 20.774′ N and 33⁰ 37.77′ E) was situated in the sublittoral zone at the depth of 8.5 m. Materials were collected from June 2002 to December 2019 mainly during the ice-free period (late May – October) as a rule, 4–5 times a season. In addition, the next data sets used in interpretation of population dynamics are presented: (1) Changes in mean near- bottom (7–8 m) temperature (± range) and mean chlorophyll a (0–7 m) concentration (µg l-1) gat study site during open-water period (May – October) in 2002–2019. (2) Changes in mean annual abundance (ind. m-2) of main macrobenthic taxa at study site in 2002–2019.