δ13 C composition of primary producers and role of detritus in a freshwater coastal ecosystem

Autor:	Elaine Ruzycki, Janet R. Keough, Cynthia Hagley, Michael E. Sierszen
Rok vydání:	1998
Předmět:	geography geography.geographical_feature_category Detritus Primary producers Ecology Wetland Aquatic Science Plankton Oceanography Food web Total inorganic carbon Phytoplankton Environmental science Ecosystem
Zdroj:	Limnology and Oceanography. 43:734-740
ISSN:	0024-3590
Popis:	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 13C-depleted DIC and lowering the net δ13C ratio of DIC in water in lowturbulence situations. The δ13C ratio for wetland phytoplankton may be depleted relative to pelagic algae because the fixed carbon is derived from decomposing detritus.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::25115773eee230bc90ec7cbf057c11b9 https://doi.org/10.4319/lo.1998.43.4.0734 Zobrazit plný text záznamu Plný text