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*d13C composition of primary producers and role of detritus in a freshwater coastal ecosystem

Limnology and Oceanography

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Abstract

Stable-isotope ratio signatures of primary producers in a coastal wetland and in adjacent offshore waters of western Lake Superior indicated that phytoplankton are the primary source of carbon for the grazing food web of this ecosystem. This study outlines the possible roles of other autotrophs in this regard. Isotopic signatures of macrophytes reflected their life-form-associated constraints on diffusion of inorganic carbon. Data indicated that differences between wetland and lake phytoplankton may be explained by the isotopic signatures of their dissolved inorganic carbon (DIC) sources. Results of an in situ experiment showed that respiration associated with macrophyte decomposition is capable of enriching surrounding water with significant amounts of *d13C-depleted DIC and lowering the net *d13C ratio of DIC in water in low-turbulence situations. The *d13C ratio for wetland phytoplankton may be depleted relative to pelagic algae because the fixed carbon is derived from decomposing detritus.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
*d13C composition of primary producers and role of detritus in a freshwater coastal ecosystem
Series title:
Limnology and Oceanography
Volume
43
Issue:
4
Year Published:
1998
Language:
English
Description:
p. 734-740
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Limnology and Oceanography
First page:
734
Last page:
740