Biodiversity of benthic microbial communities in bioturbated coastal sediments is controlled by geochemical microniches.

ISME J 2009 Nov 21;3(11):1269-85. Epub 2009 May 21.

Department of Biological Sciences, Marine Environmental Biology Section, University of Southern California, Los Angeles, CA, USA.

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.

Download full-text PDF

Source
http://dx.doi.org/10.1038/ismej.2009.62DOI Listing
November 2009
3 Reads

Publication Analysis

Top Keywords

microbial communities
20
benthic microbial
12
sediment surface
12
environmental parameters
8
ghost shrimp
8
fiddler crab
8
microbial
7
communities
7
ventilate goal
4
permanently actively
4
actively ventilate
4
inhabit permanently
4
burrows inhabit
4
constructs simpler
4
simpler j-shaped
4
j-shaped burrows
4
compared sediment
4
goal address
4
address varying
4
ecology burrows
4

References

(Supplied by CrossRef)

JY Aller et al.
Deep-Sea Res 1986

RC Aller et al.
1982

RC Aller et al.
1988

RC Aller et al.
Chem Geol 1994

RC Aller et al.
J Mar Res 1974

GT Banta et al.
Aquat Microb Ecol 1999

LGM Baas-Becking et al.
1934

FA Bisby et al.
2007

GA Brenchley et al.
J Mar Res 1981

MV Brown et al.
Aquat Microb Ecol 2005

MV Brown et al.
Environ Microbiol 2005

Similar Publications