Spirostomum teres: A long term study of an anoxic-hypolimnion population feeding upon photosynthesizing microorganisms

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60077344%3A_____%2F20%3A00541359" target="_blank" >RIV/60077344:_____/20:00541359 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.4467/16890027AP.20.002.12158" target="_blank" >https://doi.org/10.4467/16890027AP.20.002.12158</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.4467/16890027AP.20.002.12158" target="_blank" >10.4467/16890027AP.20.002.12158</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Spirostomum teres: A long term study of an anoxic-hypolimnion population feeding upon photosynthesizing microorganisms

Popis výsledku v původním jazyce

The pelagic / anoxic hypolimnion population of Spirostomum teres was investigated as a part of the long-term ciliates' monitoring (2003-2016) in an oligo- to mesotrophic monomictic hyposaline crater lake Alchichica (Puebla / Veracruz, Mexico), including an analysis of picoplankton (both heterotrophic, HPP and autotrophic, APP) and inorganic compounds of nitrogen (ammonium, nitrite, nitrate), phosphorus (dissolved reactive phosphorus, DRP) and silicon. Additionally, detailed studies of the ciliate vertical distribution and feeding activity measured upon fluorescently labelled APP (picocyanobacteria) were carried out. The results were compared with those from a neighbour freshwater crater lake La Preciosa and with a meromictic karstic lake La Cruz (Cuenca, Spain). The ciliate vertical distribution within the water column was very well defined: During the first decade, the benthic population was frequently found throughout a developing stratification of the lake. The established stratification of the lake turned the conditions favourable for the formation of an oxycline / hypolimnion population, typically, several meters below the deep chlorophyll maximum (formed basically by diatoms)., the population preferred the layers without detectable dissolved oxygen. However, an observed gradient of light (PAR) could support both oxygenic and anoxygenic photosynthesis. Late stratification after deepening of the thermocline reduced the layers with S. teres population to a minimum apparently due to the drastic change in physicochemical conditions within a metalimnion, coupled with an oxycline, and limited to 1 to 2 meters., microstratification was found. Last years, the very bottom population disappeared or it was reduced and the late stratification S. teres peaks were smaller or did not appeared. Generally, S. teres oxycline / anoxic hypolimnion population was observed from June through November. Optimum picoplankton numbers in conditions that supported the ciliate growth were found: The ciliate was peaking at APP of 0.6 to 1 x 10(5) cells mL(-1)., the optimum of HPP was observed round 1.4 x 10(6) cells mL(-1). S. teres was efficiently feeding upon picocyanobacteria in numbers of 10(5) cells mL(-1) reaching the clearance rate of 2000 nL cell(-1)h(-1), which represented in average 130 to 210 cells cell(-1)h(-1) ingested. Feeding upon purple sulphur bacteria was observed but only during the end of the lake stable stratification when the ciliate population was already dropping. On the other hand, the volume specific clearance of S. teres upon picocyanobacteria (10(3) h(-1)) did not support the hypothesis that they could serve as a sole prey. Feeding upon eukaryote phytoplankton (chlorophytes Monoraphidium minutum, diatoms Cyclotella choctawhatcheeana) could be of higher importance that previously supposed. Additionally, a use of ingested and retained photosynthetic prokaryotes is hypothesized.

Název v anglickém jazyce

Spirostomum teres: A long term study of an anoxic-hypolimnion population feeding upon photosynthesizing microorganisms

Popis výsledku anglicky

The pelagic / anoxic hypolimnion population of Spirostomum teres was investigated as a part of the long-term ciliates' monitoring (2003-2016) in an oligo- to mesotrophic monomictic hyposaline crater lake Alchichica (Puebla / Veracruz, Mexico), including an analysis of picoplankton (both heterotrophic, HPP and autotrophic, APP) and inorganic compounds of nitrogen (ammonium, nitrite, nitrate), phosphorus (dissolved reactive phosphorus, DRP) and silicon. Additionally, detailed studies of the ciliate vertical distribution and feeding activity measured upon fluorescently labelled APP (picocyanobacteria) were carried out. The results were compared with those from a neighbour freshwater crater lake La Preciosa and with a meromictic karstic lake La Cruz (Cuenca, Spain). The ciliate vertical distribution within the water column was very well defined: During the first decade, the benthic population was frequently found throughout a developing stratification of the lake. The established stratification of the lake turned the conditions favourable for the formation of an oxycline / hypolimnion population, typically, several meters below the deep chlorophyll maximum (formed basically by diatoms)., the population preferred the layers without detectable dissolved oxygen. However, an observed gradient of light (PAR) could support both oxygenic and anoxygenic photosynthesis. Late stratification after deepening of the thermocline reduced the layers with S. teres population to a minimum apparently due to the drastic change in physicochemical conditions within a metalimnion, coupled with an oxycline, and limited to 1 to 2 meters., microstratification was found. Last years, the very bottom population disappeared or it was reduced and the late stratification S. teres peaks were smaller or did not appeared. Generally, S. teres oxycline / anoxic hypolimnion population was observed from June through November. Optimum picoplankton numbers in conditions that supported the ciliate growth were found: The ciliate was peaking at APP of 0.6 to 1 x 10(5) cells mL(-1)., the optimum of HPP was observed round 1.4 x 10(6) cells mL(-1). S. teres was efficiently feeding upon picocyanobacteria in numbers of 10(5) cells mL(-1) reaching the clearance rate of 2000 nL cell(-1)h(-1), which represented in average 130 to 210 cells cell(-1)h(-1) ingested. Feeding upon purple sulphur bacteria was observed but only during the end of the lake stable stratification when the ciliate population was already dropping. On the other hand, the volume specific clearance of S. teres upon picocyanobacteria (10(3) h(-1)) did not support the hypothesis that they could serve as a sole prey. Feeding upon eukaryote phytoplankton (chlorophytes Monoraphidium minutum, diatoms Cyclotella choctawhatcheeana) could be of higher importance that previously supposed. Additionally, a use of ingested and retained photosynthetic prokaryotes is hypothesized.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10617 - Marine biology, freshwater biology, limnology

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název periodika

Acta Protozoologica

ISSN

0065-1583

e-ISSN

1689-0027

Svazek periodika

59

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

PL - Polská republika

Počet stran výsledku

26

Strana od-do

13-38

Kód UT WoS článku

000605760600002

EID výsledku v databázi Scopus

2-s2.0-85093882584