Planktonic production and respiration in oligotrophic Shield lakes

By R. Carignan, D. Planas, C. Vis. 2000

211 citations recorded by the source corpus.

A precise oxygen method was used to measure primary production, community respiration and to determine the importance of exogenous organic carbon as an energy source to planktonic communities in the epilimnion of 12 oligotrophic to mesotrophic Shield lakes. Median photosynthetic parameters observed with the oxygen method were up to twice as high as those measured with 14C in other oligotrophic Shield lakes. Gross photosynthesis was almost always larger than community respiration, with a median P:R ratio of 1.7. We observed strong relationships between respiration and gross photosynthesis, but could not detect any significant trend between respiration or the P:R ratio and the concentration of dissolved organic carbon (DOC). DOC appeared to depress both photosynthesis and respiration. These results argue against the importance of exogenous organic carbon supply as a significant energy source to freshwater planktonic communities. Previously low P:R ratios reported for oligotrophic fresh waters may be due to the uncertain meaning of 14C production data.

Subfields: Environmental Chemistry, Oceanography, Water Science and Technology

View Paper: https://www.semanticscholar.org/paper/bf6802f411f5fc977ca04ac515a8672c2dc0ee8b

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Environmental Chemistry

In Oceanography

In Water Science and Technology

Citations in the corpus

Persistence of net heterotrophy in lakes during nutrient addition and food web manipulations (2000, result): “We assume, in keeping with other literature (see Carignan et al. 2000), that the hourly value of Rday and Rnight are equal and discuss the consequences of this assumption below.”
How important are terrestrial organic carbon inputs for secondary production in freshwater ecosystems (2017, background): “Several studies have also reported that bacteria production is not correlated with the standing pool of t-DOC in aquatic systems (Amon & Benner, 1996b; Carignan et al., 2000; Farjalla, Amado, Suhett & Meirelles-Pereira, 2009; Gudasz, Bastviken, Premke, Steger & Tranvik, 2012; Kankaala, Bellido, Ojal”
Carbocentric limnology: looking back, looking forward. (2008, background): “For example, previous debates concerning net heterotrophy have focused on the pelagic component alone, through measurements of primary production and respiration of bottled epilimnetic samples (del Giorgio and Peters 1994; Carignan et al. 2000).”
Pathways of organic carbon utilization in small lakes: Results from a whole‐lake 13C addition and coupled model (2002, background): “Aquatic ecosystems receive organic matter from two distinct sources: primary production occurring within the system (autochthonous production) and loading of terrestrial organic matter from the watershed (allochthonous loading).”
Depth-integrated, continuous estimates of metabolism in a clear-water lake (2008, background): “Bottle incubations estimate primary production by measuring the change in DO (Carignan et al. 2000) or the uptake of 14C (Peterson 1980; del Giorgio and Peters 1994) that occurs in a contained sample over a specific amount of time and usually under controlled temperature and light conditions.”