Structural Composition of Protozooplankton Communities in Relation to Environmental Factors in Shallow Lakes and Reservoirs of Rīga, Latvia

• Main Authors: Buholce Linda, Līcīte Vita, Boikova Elmīra, Botva Uldis
• Format: Article
• Language: English
• Published: Sciendo 2015-08-01
• Series: Proceedings of the Latvian Academy of Sciences. Section B, Natural Sciences
• Subjects: urban ecology; ciliated protozoa; plankton; shallow lake; structural composition
• Online Access: https://doi.org/10.1515/prolas-2015-0015

Protozooplankton are dominant grazers of phytoplankton and an important component of the microbial food web, as a link between pico and nanoplankton to higher trophic levels. Their fast growing rate, relative abundance, biomass and diversity are used as indicators of organic and toxic pollution. The impact of urbanisation on ecosystems and their sustainability and biodiversity have recently been much studied. We studied the protozooplankton ciliate communities during the vegetation period from April to October in two small lakes (Bābelītis, Gaiļezers) and two reservoirs (Bolderāja, Saurieši). The largest peak of biomass (15.7 × 102 mg/l) was found in Gaiļezers Lake in August and of abundance (60.2 × 103 org/l) in Bābelītis Lake in July. The lowest biomass (0.006 mg/l) and abundance (0.12 × 103 org/l) were found in the Saurieši Reservoir station. The most abundant ciliates were from the order Oligotrichida.