AME - Vol. 75 No. 1 - Feature article


Prokaryotic communities of the deep chlorophyll maximum (DCM) of the South Pacific Gyre vary significantly with sea-surface chlorophyll (colours) and DCM depth (histograms). (image: Robert Pockalny, University of Rhode Island)

Walsh EA, Smith DC, Sogin ML, D’Hondt S

 

Bacterial and archaeal biogeography of the deep chlorophyll maximum in the South Pacific Gyre

 

The bacterial and archaeal communities of the deep chlorophyll maximum (DCM) in the South Pacific Gyre (SPG) are strikingly homogeneous despite vast distances between sites and pronounced variation in DCM depth: the Bray-Curtis similarity at the DCM was 70% for Bacteria and 80% for Archaea. Comparison of bacterial assemblages from the SPG, the North Pacific Gyre and the relatively nutrient- and chlorophyll-rich equatorial Pacific (EQP) shows that DCM assemblages of these 3 regions are statistically distinct from each other. This distinctness is influenced by environmental conditions, as the communities of the 2 gyres resemble each other more closely than either resembles the EQP community (which lives geographically between them). In short, DCM microbial communities are statistically distinct in different oceanic regions, but consistent within regions for thousands of kilometers.

 

Inter-Research Science Publisher is pleased to make this Feature Article openly available for viewing by our readers.

 

Abstract   Back to contents page   Link to full PDF