Habitat diversity and type govern potential nitrogen loss by denitrification in coastal sediments and differences in ecosystem-level diversities of disparate N2O reducing communities
Autor: | Lars Gamfeldt, Kristina Sundbäck, Christian Alsterberg, Stefan Hulth, Christopher M. Jones, Sara Hallin, Lea Wittorf, Fabian Roger |
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Rok vydání: | 2019 |
Předmět: |
0301 basic medicine
Denitrification Nitrogen habitat loss 030106 microbiology illuminated shallow-water sediments Nitrous Oxide Applied Microbiology and Biotechnology Microbiology Mesocosm 03 medical and health sciences Denitrifying bacteria Abundance (ecology) nosZ Ecosystem AcademicSubjects/SCI01150 biology Ecology Bacteria Microbiota fungi benthic communities respiratory system biology.organism_classification equipment and supplies niche differentiation nitrogen removal 030104 developmental biology Habitat destruction Microbiology (Microbiology in the medical area to be 30109) Habitat human activities Ruppia maritima Research Article |
Zdroj: | FEMS Microbiology Ecology |
ISSN: | 1574-6941 |
Popis: | In coastal sediments, excess nitrogen is removed primarily by denitrification. However, losses in habitat diversity may reduce the functional diversity of microbial communities that drive this important filter function. We examined how habitat type and habitat diversity affects denitrification and the abundance and diversity of denitrifying and N2O reducing communities in illuminated shallow-water sediments. In a mesocosm experiment, cores from four habitats were incubated in different combinations, representing ecosystems with different habitat diversities. We hypothesized that habitat diversity promotes the diversity of N2O reducing communities and genetic potential for denitrification, thereby influencing denitrification rates. We also hypothesized that this will depend on the identity of the habitats. Habitat diversity positively affected ecosystem-level diversity of clade II N2O reducing communities, however neither clade I nosZ communities nor denitrification activity were affected. The composition of N2O reducing communities was determined by habitat type, and functional gene abundances indicated that silty mud and sandy sediments had higher genetic potentials for denitrification and N2O reduction than cyanobacterial mat and Ruppia maritima meadow sediments. These results indicate that loss of habitat diversity and specific habitats could have negative impacts on denitrification and N2O reduction, which underpin the capacity for nitrogen removal in coastal ecosystems. Within illuminated shallow-water sediments, habitat diversity was shown to promote ecosystem-level diversity of nitrous oxide reducing communities, whereas habitat type determined the denitrification potential of the benthic microbial communities. |
Databáze: | OpenAIRE |
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