Long-term monitoring of fish in a freshwater reservoir: Different ways of weighting complex spatial samples.

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60077344%3A_____%2F22%3A00569071" target="_blank" >RIV/60077344:_____/22:00569071 - isvavai.cz</a>

Alternative codes found

RIV/60076658:12310/22:43905347

Result on the web

<a href="https://doi.org/10.3389/fenvs.2022.1000087" target="_blank" >https://doi.org/10.3389/fenvs.2022.1000087</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3389/fenvs.2022.1000087" target="_blank" >10.3389/fenvs.2022.1000087</a>

Result language

angličtina

Original language name

Long-term monitoring of fish in a freshwater reservoir: Different ways of weighting complex spatial samples.

Original language description

Anthropogenic activities continue to pose the greatest challenges to freshwater ecosystems. Therefore, long-term monitoring is essential for the management and conservation of these resources. Monitoring programs for freshwater bodies often use a range of indicators, including biological elements such as fish. Existing European standard provides a depth-stratified gillnet sampling approach mainly in benthic habitats and at the deepest part of lakes to account for the uneven distribution of fish. However, the commonly used CEN (European Committee for Standardization) protocol does not weight sufficiently habitat volumes and underrepresent pelagic habitats to calculate whole-lake catch and biomass per unit effort (CPUE and BPUE, respectively). Extended European standard gillnet (4 larger mesh-sizes added in the geometric series) catch data collected over 18 years (2004-2021) in Rimov Reservoir (Czech Republic) were used for a method comparison on indices for relative abundance and biomass of fish: CEN protocol without volume-weighting and two volume-weighted approaches. We also evaluated changes in species composition and trends in these fish population over time. Results indicated interannual changes in species composition, relative abundance, and biomass of fish community. The CEN protocol tended to put greater emphasis on benthic habitats which generally have larger CPUE and BPUE. Consequently, the two volume-weighting approaches produced lower estimates of the two parameters, with the exception of the most dominant pelagic bleak Alburnus alburnus (L.). All approaches consistently showed an increasing trend in whole-reservoir fish abundance and a decreasing trend in biomass over the study period. Following our assessment, we put forward the volume-weighting approach that considers the Volume of the depth Stratum (VOST) for weighting as the most realistic approximation of fish populations and therefore recommend its use.

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

—

OECD FORD branch

10618 - Ecology

Project

<a href="/en/project/EF16_025%2F0007417" target="_blank" >EF16_025/0007417: Biomanipulation as a tool for improving water quality of dam reservoirs</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2022

Confidentiality

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

Name of the periodical

Frontiers in Environmental Science

ISSN

2296-665X

e-ISSN

2296-665X

Volume of the periodical

10

Issue of the periodical within the volume

Dec

Country of publishing house

CH - SWITZERLAND

Number of pages

23

Pages from-to

1000087

UT code for WoS article

000900404100001

EID of the result in the Scopus database

2-s2.0-85145076754