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Effects of climate on organic carbon and the ratio of planktonic to benthic primary producers in a subarctic lake during the past 45 years

Rosen, P. (author)
Cunningham, L. (author)
Vonk, Jorien (author)
Stockholms universitet,Institutionen för tillämpad miljövetenskap (ITM)
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Karlsson, J. (author)
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 (creator_code:org_t)
2009
2009
English.
In: Limnology and Oceanography. - 0024-3590 .- 1939-5590. ; 54:5, s. 1723-1732
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • The effects of climatic variables on lake-water total organic carbon (TOC) concentrations and benthic and pelagic primary producers during the past 45 yr were assessed using the sediment records of two subarctic lakes, one with mires and one without mires connected to the lake. The lake with a mire showed large and synchronous changes in the planktonic to benthic (P : B) ratio of diatoms and concentrations of TOC inferred from near-infrared spectroscopy. During periods of warm temperatures, high precipitation, and long ice-free conditions, we inferred high TOC in the lake, and the diatom community was dominated by planktonic species. The stable carbon isotopic (delta C-13) values of sediment organic matter were negatively correlated with inferred TOC concentration and P : B ratio. We suggest that the changes in TOC and P : B ratio were a result of changing climate, permafrost degradation, and related changes in the catchment. Terrestrial organic matter, by its strong effect on the penetration of light through the lake water, possibly affected the habitats available for benthic photosynthesis and thus the delta C-13 of the sediment organic matter. The large changes in recent times may also be because of unusually long ice-free periods, warmer temperatures, and other associated limnological changes. The lake with no mire next to the lake showed only minor changes in lake-water TOC during the same period and P : B ratio remained almost constant until the past 5 yr, when the P : B ratio increased rapidly. The observed changes in P : B ratio within this lake may be because of complex interactions of several climate-related variables

Subject headings

NATURVETENSKAP  -- Geovetenskap och miljövetenskap (hsv//swe)
NATURAL SCIENCES  -- Earth and Related Environmental Sciences (hsv//eng)

Keyword

american
catchment
climate
dioxide supersaturation
environmental-changes
exposure
gradient
lakes
near-infrared spectroscopy
northern sweden
organic-matter
permafrost
record
respiration
sediment
values
water
waters
Earth sciences
Geovetenskap

Publication and Content Type

ref (subject category)
art (subject category)

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Rosen, P.
Cunningham, L.
Vonk, Jorien
Karlsson, J.
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NATURAL SCIENCES
NATURAL SCIENCES
and Earth and Relate ...
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Limnology and Oc ...
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Stockholm University

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