Fasting or feeding: A planktonic food web under lake ice

Details

Ressource 1Download: Freshwater Biology - 2020 - Perga - Fasting or feeding A planktonic food web under lake ice.pdf (1046.21 [Ko])
State: Public
Version: Final published version
License: CC BY-NC-ND 4.0
Serval ID
serval:BIB_B770EDDB9614
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Fasting or feeding: A planktonic food web under lake ice
Journal
Freshwater Biology
Author(s)
Perga Marie-Elodie, Syarki Maria, Spangenberg Jorge E., Frossard Victor, Lyautey Emilie, Kalinkina Natalia, Bouffard Damien
ISSN
0046-5070
1365-2427
Publication state
Published
Issued date
03/2021
Peer-reviewed
Oui
Volume
66
Number
3
Pages
570-581
Language
english
Abstract

Zooplankton can spend winter actively under the ice cover of lakes. However, dietary resources under lake ice are both quantitatively and qualitatively limited, and feeding might not be energetically rewarding for most zooplankton species. Many zooplankters are expected to fast throughout the winter, exhausting their previously accumulated fat storage. We hypothesised that only a fraction of the actively overwintering zooplankton contributes to an active food web under lake ice, leading to few trophic linkages within the planktonic community.
Zooplankton habitats and feeding were investigated under the ice of Lake Onego. Zooplankton habitats and migrations were studied by coupling zooplankton sampling around the clock to measurements of particle movement using an acoustic Doppler current profiler. Secondly, fatty acid-specific stable isotope compositions were used to determine whether and which zooplankton fatty acids ultimately came from the assimilation of under-ice seston.
The algal biomass was low under ice and mostly dominated by large diatoms. Copepods dominated the zooplankton community. Species present as late copepodite and adult instars were confined to the deeper layers, while nauplii occupied the surface layer. Diel vertical migration by Cyclops was the most tangible observation of persistent feeding under the ice. Previously accumulated fat storage represented most of zooplankton fatty acids, with few, yet detectable, fatty acids recently acquired by feeding under the ice.
Although some zooplankton taxa maintained feeding activity under the ice of Lake Onego, the food source available beneath the ice was not sufficiently rewarding to leave an isotopic imprint upon the dominant fatty acids of bulk zooplankton. The seston fatty acids that were passed on to zooplankton from feeding under ice were not provided by diatoms, although they made up most of the phytoplankton biovolume. Instead, the zooplankton food web was supported by mixotrophic phytoplankton (i.e. cryptophytes and chrysophytes) that represented <5% of the under-ice biovolume. Consequently, the planktonic food web under the ice of Lake Onego had few trophic linkages, and thereby low connectance.
Environmental conditions under the ice of Lake Onego do not depart significantly from those observed in lakes of similar latitudes. Therefore, low connectance food webs could be relatively common under ice for lakes above 60° latitude. Our methodological approach is applicable to other lakes and could thus disclose the variability of under-ice food webs. This would provide a much more complete picture of annual dynamics of food webs in lakes that ice over.
Keywords
CS-SIA, diel vertical migration, table isotope, winter limnology, zooplankton
Web of science
Open Access
Yes
Create date
04/01/2021 13:47
Last modification date
03/12/2022 6:48
Usage data