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Critical Studies in Diversity Management Literature
FREE Shipping. A predominant contrast between these habitats is the relative importance of algal vs. While it is possible that the structure and function of microbiota on allochthonous substrates responds differently to environmental changes than those associated with autochthonous substrates Dodds, , like primary production, decomposition and microbial mineralization of terrestrial OM in streams responds positively to changes in nutrient concentrations and temperature Boyero et al.
The topic of microbial metabolism of algal versus terrestrial OM is increasingly relevant in all aquatic systems Del Giorgio et al. In addition to the organic substrate heterogeneity presented by the benthos-dominated lotic ecosystem, the level of interaction between benthic and pelagic habitats affects aquatic diversity and function Covich et al. Bacterioplankton community composition can be temporally predictable, in concert with temporal variation in environmental parameters such as light and temperature Fuhrman et al.
Benthic surface- and sediment-attached microbiota are exposed to variability in physical factors, such as shear stress and surface roughness, as well as changes in light and water quality, and biofilm formation is a predominant characteristic of lotic microbiota. Thus, the large heterogeneity in surfaces available for colonization within a stream reach presents a variety of contrasting selective environments Battin et al. Also, bacterioplankon diversity is impacted by water residence time, Crump et al. Thus, both dispersal and environmental filtering are strong forces in microbial biofilm community assembly in stream and river ecosystems, making lotic systems highly appropriate for understanding metacommunity dynamics Logue et al.
Surface-attached and bed sediment-entrained cells are not always accounted for in broad views of microbial life in aquatic ecosystems Whitman et al.
Further research on lotic microbial diversity, including themes such as community assembly, OM source and metabolism, and functional diversity and redundancy under multi-factor environmental variability, is critical to understanding and managing aquatic ecosystem functions in a changing world. Yet lotic microbial diversity is still understudied: Many studies to date are observational, few are experimental; most take place within one stream, few employ cross-site comparisons that would facilitate identification of universal drivers.
Given the importance of stream microbes to global biogeochemical cycles, the rapidly increasing accessibility of molecular tools and data, and the relevance of stream microbiota to larger ecological questions, there is still a lot to be learned about lotic microbial diversity. The author declares that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. Many thanks to the many people with whom I have discussed stream microbial ecology over the years, especially Cliff Dahm, Tina Vesbach, and Bob Sinsabaugh, to the editors of this special issue for the forum, to Walter Dodds and Allison Veach for their thoughtful feedback on the manuscript, and to the reviewers of this manuscript for their constructive comments.
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Critical Studies in Diversity Management Literature
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