Impacts of an extreme flood on the ecosystem of a headwater stream

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00023272%3A_____%2F21%3A10135055" target="_blank" >RIV/00023272:_____/21:10135055 - isvavai.cz</a>

Result on the web

<a href="https://www.jlimnol.it/index.php/jlimnol/article/view/jlimnol.2021.1998" target="_blank" >https://www.jlimnol.it/index.php/jlimnol/article/view/jlimnol.2021.1998</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.4081/jlimnol.2021.1998" target="_blank" >10.4081/jlimnol.2021.1998</a>

Result language

angličtina

Original language name

Impacts of an extreme flood on the ecosystem of a headwater stream

Original language description

Headwater streams are the smallest parts of rivers but make up the majority of river miles. The chemistry and macroinvertebrate composition of such streams are among the most important indicators of their environmental health. Macroinvertebrates are affected namely by runoff genesis and, in many regions of the world, also by acid atmospheric deposition and its consequences. The aim of this paper is to evaluate the impacts of an extreme summer flash flood on the physical environment, chemistry and macroinvertebrates in a small headwater stream located in the Beech-woods National Nature Reserve of the Jizera Mts. (Czech Republic). The studied stream is characterized by a pluvial hydrologic regime with perennial streamflow uniformly distributed within the year, with peak-flows originating mainly from summer rainstorms, and moderate current anthropogenic acidification. During the observed summer flash flood of the return period near 1,000 years, high currents (1-2.5 m s-1) flushed out 2.7 m3 of sand and gravel from the streambed, resulting in a devastating effect on macroinvertebrates. Both number of species/taxa and diversity were reduced by about 50% while the abundance of surviving taxa was reduced to about 10% compared with before the flood. The following spring after the event, both number of species/taxa, diversity and abundance increased, partially due to the temporary unsuccessful colonization of the site by several alien species creating a peak of biological diversity, but complete recovery of the original macroinvertebrate assemblages was not observed even during the subsequent two years. On the other hand, a significant drop in sulphate contents and rising alkalinity observed in stream waters during base flow conditions after the flood indicate positive effects on recovery of the aquatic environment by depleting the catchment sulphur pool. Thus, the flood did not significantly alter the long-term recovery of the studied headwater stream from acidification.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10616 - Entomology

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2021

Confidentiality

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

Name of the periodical

Journal of Limnology

ISSN

1723-8633

e-ISSN

—

Volume of the periodical

80

Issue of the periodical within the volume

2

Country of publishing house

IT - ITALY

Number of pages

12

Pages from-to

1998

UT code for WoS article

000663904900002

EID of the result in the Scopus database

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