Author:
Findlay Stuart,Sinsabaugh Robert L.
Abstract
Dissolved organic matter (DOM) constitutes a large proportion of the organic
carbon in all aquatic ecosystems and is often a significant carbon resource
for heterotrophic microorganisms. Diverse sources, compositional complexity
and multiple transformation pathways have made it difficult to generalize
about the bioavailability of this material. Recently, there has been dramatic
progress in identifying sources of DOM, describing its composition and tracing
its movement through microbial food webs. A number of conceptual, mechanistic
and empirical approaches have been proposed to synthesize this rapidly
expanding body of knowledge. This paper reviews these approaches, and some
general hypotheses for focusing future research are proposed. As a first step
in synthesizing the available information, predictions are made about how
variability in sources, hydrology and biotic removal interact to generate
temporal and spatial patterns in DOM from a stream’s headwaters to a
large river.
Subject
Ecology,Aquatic Science,Ecology, Evolution, Behavior and Systematics,Oceanography
Cited by
85 articles.
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