Macroinvertebrates of the upper Vltava River catchment

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00020711%3A_____%2F24%3A10155318" target="_blank" >RIV/00020711:_____/24:10155318 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Macroinvertebrates of the upper Vltava River catchment

Original language description

The study on water macroinvertebrate communities in 6 localities in upper Vltava River catchment was carried out in the years 2018-2020 within the project &quot;Strengthening and protection of the freshwater pearl mussel population in the Šumava National Park&quot;. Macroinvertebrate communities reflect the long-term state of water chemistry, including any chronic or episodic pollution. It thus provides important information that we cannot obtain, for example, through chemical analysis of water, based on one-time sampling. Three localities were situated in Teplá Vltava River, where the freshwater pearl mussel (Margaritifera margaritifera) is found, other three samples were taken from Studená Vltava, Řasnice and Vltava River above the Lipno Reservoir. Sampling always took place in the spring and autumn seasons, and 5-8 different habitats were sampled in each locality. A total of 166 habitat samples was determined, with the taxa of Oligochaeta, Chironomidae andTrichoptera most prominently represented. Saprobity indices, diversity indices and the EPT/Chironomidae ratio (i.e. the sum of Ephemeroptera, Plecoptera and Trichoptera related to the number of Chironomidae) were compared, as well as the representation of individual functional feeding groups and the occurrence of endangered and rare species. In the longitudinal profile of the stream, it was important to compare the macroinvertebrate community above and below the Volarský Stream, where we assumed a significant effect of the excessive input of nutrients. As expected, the higher localities were oligosaprobic, while the lower sites were on the beta - mesosaprobic level. However, the diversity index was high and relatively balanced in all localities, and there was no apparent degradation of the community due to increased saprobity below the Volarský Stream estuary. The composition of the functional feeding groups also corresponded without exception to the altitude, flow order and other environmental parameters. Therefore, the state corresponds to a higher flow order and investigated catchment represents a well-preserved river continuum with near-natural macroinvertebrate community of a meandering foothill river. The absence of freshwater pearl mussel below the Volarský Stream estuary is presumably caused by other factors, e.g. episodic pollution, while the higher saprobity is supposed to be within the limits of its ecological valence.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

10619 - Biodiversity conservation

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2024

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů