Top-down and bottom-up control of plankton structure and dynamics in hypertrophic fishponds

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F25173154%3A_____%2F23%3AN0000008" target="_blank" >RIV/25173154:_____/23:N0000008 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/60076658:12220/23:43906377

Výsledek na webu

<a href="https://link.springer.com/content/pdf/10.1007/s10750-023-05312-5.pdf" target="_blank" >https://link.springer.com/content/pdf/10.1007/s10750-023-05312-5.pdf</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s10750-023-05312-5" target="_blank" >10.1007/s10750-023-05312-5</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Top-down and bottom-up control of plankton structure and dynamics in hypertrophic fishponds

Popis výsledku v původním jazyce

We investigated the effects of strong top-down control by high fish stock on structure and seasonal dynamics of plankton in nine fishponds under conventional fishery management based on auxiliary feeding during two vegetation seasons. Mean concentrations of total nitrogen, phosphorus, and high densities of phytoplankton, bacteria, heterotrophic nanoflagellates, and ciliates indicated hypertrophic state of the fishponds, as well as a markedly reduced control of these microbial food web components by crustacean zooplankton. Mean seasonal densities of zooplankton varied within one order of magnitude for cladocerans, copepods, nauplii, and rotifers. Daphnia were found in most fishponds in densities up to 630 ind. l(-1) (median: 53 ind. l(-1)). While TN and TP concentrations were high, dissolved inorganic N (median: 29 & mu;g l(-1)) and reactive P (median: 11 & mu;g l(-1)) indicated possible nutrient deficiency. The fish stock index (defined as the product of biomass and square root of densities) was used as a proxy for fish predation pressure. Multivariate analysis revealed that nutrients and high fish stocks (market carp, carp fry, and/or undesirable small planktivorous fishes) were the main driving forces shaping the fishpond plankton. The resulting trophic structure thus severely reduced the herbivorous zooplankton-fish link during a vegetation season.

Název v anglickém jazyce

Top-down and bottom-up control of plankton structure and dynamics in hypertrophic fishponds

Popis výsledku anglicky

We investigated the effects of strong top-down control by high fish stock on structure and seasonal dynamics of plankton in nine fishponds under conventional fishery management based on auxiliary feeding during two vegetation seasons. Mean concentrations of total nitrogen, phosphorus, and high densities of phytoplankton, bacteria, heterotrophic nanoflagellates, and ciliates indicated hypertrophic state of the fishponds, as well as a markedly reduced control of these microbial food web components by crustacean zooplankton. Mean seasonal densities of zooplankton varied within one order of magnitude for cladocerans, copepods, nauplii, and rotifers. Daphnia were found in most fishponds in densities up to 630 ind. l(-1) (median: 53 ind. l(-1)). While TN and TP concentrations were high, dissolved inorganic N (median: 29 & mu;g l(-1)) and reactive P (median: 11 & mu;g l(-1)) indicated possible nutrient deficiency. The fish stock index (defined as the product of biomass and square root of densities) was used as a proxy for fish predation pressure. Multivariate analysis revealed that nutrients and high fish stocks (market carp, carp fry, and/or undesirable small planktivorous fishes) were the main driving forces shaping the fishpond plankton. The resulting trophic structure thus severely reduced the herbivorous zooplankton-fish link during a vegetation season.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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OECD FORD obor

10617 - Marine biology, freshwater biology, limnology

Projekt

<a href="/cs/project/GA17-09310S" target="_blank" >GA17-09310S: Rybníky jako modely pro studium diversity a dynamiky planktonu hypetrofních mělkých jezer</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název periodika

Hydrobiologia

ISSN

0018-8158

e-ISSN

1573-5117

Svazek periodika

851

Číslo periodika v rámci svazku

5

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

7

Strana od-do

1095-1111

Kód UT WoS článku

001037077200001

EID výsledku v databázi Scopus

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