Ecosystem responses to increased organic carbon concentration: comparing results based on longterm monitoring and whole-lake experimentation

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Kankaala , P , Arvola , L , Hiltunen , M , Huotari , J , Jones , R I , Hannu , N , Ojala , A , Olin , M , Peltomaa , E , Peura , S , Rask , M , Tulonen , T & Vesala , S 2019 , ' Ecosystem responses to increased organic carbon concentration: comparing results based on longterm monitoring and whole-lake experimentation ' , Inland waters , vol. 9 , no. 4 , pp. 489-502 . https://doi.org/10.1080/20442041.2019.1600938

Title: Ecosystem responses to increased organic carbon concentration: comparing results based on longterm monitoring and whole-lake experimentation
Author: Kankaala, Paula; Arvola, Lauri; Hiltunen, Minna; Huotari, Jussi; Jones, Roger I.; Hannu, Nykänen; Ojala, Anne; Olin, Mikko; Peltomaa, Elina; Peura, Sari; Rask, Martti; Tulonen, Tiina; Vesala, Sami
Contributor organization: Lammi Biological Station
Ecosystems and Environment Research Programme
Institute for Atmospheric and Earth System Research (INAR)
Helsinki Institute of Sustainability Science (HELSUS)
Viikki Plant Science Centre (ViPS)
Anne Ojala / Principal Investigator
Ecosystem processes (INAR Forest Sciences)
Date: 2019-10-02
Language: eng
Number of pages: 14
Belongs to series: Inland waters
ISSN: 2044-2041
DOI: https://doi.org/10.1080/20442041.2019.1600938
URI: http://hdl.handle.net/10138/310156
Abstract: Recent increases in terrestrial dissolved organic carbon (DOC) concentrations in northern inland waters have many ecological consequences. We examined available data on carbon cycles and food webs of 2 boreal headwater lakes in southern Finland. Basic limnology and catchment characteristics of a pristine lake, Valkea-Kotinen (VK), were monitored over the past 25 years while the lake has undergone browning and DOC increased from similar to 11 to 13 mg L-1. Pronounced changes in the early 2000s represent a regime shift in DOC concentration and color. Lake Alinen Mustajarvi (AM) was manipulated for 2 years by additions of labile DOC (cane sugar), raising the DOC concentration from similar to 10 to 12 mg L-1, but not changing light conditions. The 2 different approaches both revealed increased concentrations and efflux of carbon dioxide (CO2) from the lakes and thus net heterotrophy and changes in the pelagic community structure following an increase in DOC concentration. Long-term monitoring of VK revealed a decline in phytoplankton primary production (PP) along with browning, which was reflected in retarded growth of young (1-2-year-old) perch. In the experimentally manipulated lake (AM), PP was not affected, and the growth of young perch was more variable. The results suggested the importance of a pathway from labile DOC via benthic invertebrates to perch. Although provided with this extra resource, the food chain based on DOC proved inefficient. Long-term monitoring and whole-lake experimentation are complementary approaches for revealing how freshwater ecosystems respond to climate and/or atmospheric deposition-induced changes, such as browning.
Subject: BACTERIAL METABOLISM
BOREAL LAKE
CO2 flux
DOC
FOOD WEBS
FOREST LAKES
GROWTH
HUMIC LAKE
MATTER
PLANKTON
TERRESTRIAL CARBON
boreal lakes
browning
food webs
lake metabolism
terrestrial organic carbon
1181 Ecology, evolutionary biology
Peer reviewed: Yes
Usage restriction: closedAccess
Self-archived version: submittedVersion


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