Biodiversity of benthic microbial communities in bioturbated coastal sediments is controlled by geochemical microniches
- 21 May 2009
- journal article
- Published by Oxford University Press (OUP) in The ISME Journal
- Vol. 3 (11), 1269-1285
- https://doi.org/10.1038/ismej.2009.62
Abstract
We used a combination of field and laboratory approaches to address how the bioturbation activity of two crustaceans, the ghost shrimp Neotrypaea californiensis and the fiddler crab Uca crenulata, affects the microbial diversity in the seabed of a coastal lagoon (Catalina Harbor, Santa Catalina Island, CA, USA). Detailed geochemical analyses, including oxygen microsensor measurements, were performed to characterize environmental parameters. We used a whole-assemblage fingerprinting approach (ARISA: amplified ribosomal intergenic spacer analysis) to compare bacterial diversity along geochemical gradients and in relation to subsurface microniches. The two crustaceans have different burrowing behaviors. The ghost shrimp maintains complex, deep-reaching burrows and permanently lives subterranean, supplying its burrow with oxygen-rich water. In contrast, the fiddler crab constructs simpler, J-shaped burrows, which it does not inhabit permanently and does not actively ventilate. Our goal was to address how varying environmental parameters affect benthic microbial communities. An important question in benthic microbial ecology has been whether burrows support similar or unique communities compared with the sediment surface. Our results showed that sediment surface microbial communities are distinct from subsurface assemblages and that different burrow types support diverse bacterial taxa. Statistical comparisons by canonical correspondence analysis indicated that the availability of oxidants (oxygen, nitrate, ferric iron) play a key role in determining the presence and abundance of different taxa. When geochemical parameters were alike, microbial communities associated with burrows showed significant similarity to sediment surface communities. Our study provides implications on the community structure of microbial communities in marine sediments and the factors controlling their distribution.Keywords
This publication has 96 references indexed in Scilit:
- Microarray-Based Characterization of Microbial Community Functional Structure and Heterogeneity in Marine Sediments from the Gulf of MexicoApplied and Environmental Microbiology, 2008
- A latitudinal diversity gradient in planktonic marine bacteriaProceedings of the National Academy of Sciences of the United States of America, 2008
- Radon‐222 budget in Catalina Harbor, California: 2. Flow dynamics and residence time in a tidal beachLimnology and Oceanography, 2008
- Diversity, Composition, and Geographical Distribution of Microbial Communities in California Salt Marsh SedimentsApplied and Environmental Microbiology, 2006
- Microbial biogeography: putting microorganisms on the mapNature Reviews Microbiology, 2006
- Marine bacterial microdiversity as revealed by internal transcribed spacer analysisAquatic Microbial Ecology, 2005
- Spatial and Resource Factors Influencing High Microbial Diversity in SoilApplied and Environmental Microbiology, 2002
- Carbon and nitrogen fluxes in sediment inhabited by suspension-feeding (Nereis diversicolor) and non-suspension-feeding (N. virens) polychaetesMarine Ecology Progress Series, 2000
- Nutrient Fluxes, Porewater Profiles and Denitrification in Sediment Influenced by Algal Sedimentation and Bioturbation by Monoporeia affinisEstuarine, Coastal and Shelf Science, 1999
- Genetic and ecotypic structure of a fluorescent Pseudomonas populationMolecular Ecology, 1996