scholarly journals Differential Distribution and Determinants of Ammonia Oxidizing Archaea Sublineages in the Oxygen Minimum Zone off Costa Rica

2019 ◽  
Vol 7 (10) ◽  
pp. 453 ◽  
Author(s):  
Yanhong Lu ◽  
Xiaomin Xia ◽  
Shunyan Cheung ◽  
Hongmei Jing ◽  
Hongbin Liu
Keyword(s):  
Costa Rica ◽  
Water Column ◽  
Gulf Of California ◽  
North Pacific Ocean ◽  
Oxygen Minimum Zone ◽  
Low Oxygen ◽  
Environmental Determinants ◽  
Ammonia Oxidizing Archaea ◽  
Minimum Zone ◽  
Oxygen Minimum

Ammonia oxidizing archaea (AOA) are microbes that are widely distributed in the ocean that convert ammonia to nitrite for energy acquisition in the presence of oxygen. Recent study has unraveled highly diverse sublineages within the previously defined AOA ecotypes (i.e., water column A (WCA) and water column B (WCB)), although the eco-physiology and environmental determinants of WCB subclades remain largely unclear. In this study, we examined the AOA communities along the water columns (40–3000 m depth) in the Costa Rica Dome (CRD) upwelling region in the eastern tropical North Pacific Ocean. Highly diverse AOA communities that were significantly different from those in oxygenated water layers were observed in the core layer of the oxygen minimum zone (OMZ), where the dissolved oxygen (DO) concentration was < 2μM. Moreover, a number of AOA phylotypes were found to be enriched in the OMZ core. Most of them were negatively correlated with DO and were also detected in other OMZs in the Arabian Sea and Gulf of California, which suggests low oxygen adaptation. This study provided the first insight into the differential niche partitioning and environmental determinants of various subclades within the ecotype WCB. Our results indicated that the ecotype WCB did indeed consist of various sublineages with different eco-physiologies, which should be further explored.

scholarly journals Protist communities in a marine oxygen minimum zone off Costa Rica by 454 pyrosequencing

2015 ◽  
Vol 12 (16) ◽  
pp. 13483-13509 ◽  
Author(s):  
H. Jing ◽  
E. Rocke ◽  
L. Kong ◽  
X. Xia ◽  
H. Liu ◽  
...  
Keyword(s):  
Costa Rica ◽  
Water Column ◽  
454 Pyrosequencing ◽  
18S Rrna Gene ◽  
Oxygen Minimum Zone ◽  
Community Diversity ◽  
Rrna Gene ◽  
Minimum Zone ◽  
Clear Shift ◽  
Oxygen Minimum

Abstract. Marine planktonic protists, including microalgae and protistan grazers, are an important contributor to global primary production and carbon and mineral cycles, however, little is known about their population shifts along the oxic-anoxic gradient in the water column. We used 454 pyrosequencing of the 18S rRNA gene and gene transcripts to study the community composition of whole and active protists throughout a water column in the Costa Rica Dome, where a stable oxygen minimum zone (OMZ) exists at a depth of 400~700 m. A clear shift of protist composition from photosynthetic Dinoflagellates in the surface to potential parasitic Dinoflagellates and Ciliates in the deeper water was revealed along the vertical profile at both rRNA and rDNA levels. Those protist groups recovered only at the rDNA level represent either lysed aggregates sinking from the upper waters or potential hosts for parasitic groups. UPGMA clustering demonstrated that total and active protists in the anoxic core of OMZ (550 m) were distinct from those in other water depths. The reduced community diversity and presence of a parasitic/symbiotic trophic lifestyle in the OMZ, especially the anoxic core, suggests that OMZs can exert a selective pressure on protist communities. Such changes in community structure and a shift in trophic lifestyle could result in a modulation of the microbial loop and associated biogeochemical cycling.

Abundance and distribution of diverse membrane-bound monooxygenase (Cu-MMO) genes within the Costa Rica oxygen minimum zone

2013 ◽  
Vol 5 (3) ◽  
pp. 414-423 ◽  
Author(s):  
Patricia L. Tavormina ◽  
William Ussler ◽  
Joshua A. Steele ◽  
Stephanie A. Connon ◽  
Martin G. Klotz ◽  
...  
Keyword(s):  
Costa Rica ◽  
Oxygen Minimum Zone ◽  
Minimum Zone ◽  
Membrane Bound ◽  
Abundance And Distribution ◽  
Oxygen Minimum

Effects of the oxygen minimum zone on squat lobster distributions in the Gulf of California, Mexico

2014 ◽  
Vol 9 (1) ◽  
pp. 92-103 ◽  
Author(s):  
Michel Hendrickx ◽  
David Serrano
Keyword(s):  
Gulf Of California ◽  
Oxygen Minimum Zone ◽  
Long Distance ◽  
Sampling Locations ◽  
Minimum Zone ◽  
Shallow Area ◽  
Bottom Oxygen ◽  
Lower Limits ◽  
Squat Lobsters ◽  
Oxygen Minimum

AbstractDistribution of squat lobsters of the genera Gastropthychus (one species), Uroptychus (1), Janetogalathea (1), Galacantha (1), Munidopsis (8), and Munida (7) in the Gulf of California, Mexico, was plotted vs. the localization of the Oxygen Minimum Zone (OMZ) using bottom projections of the 0.50, 0.25, 0.10, and 0.05 ml l−1 oxylines. Four fringes where oxygen concentrations were equal or lower than these concentrations were obtained, extending from the southern Gulf to about 28°–28°30′N. A total of 172 sampling locations with squat lobsters were plotted on four maps, one for each fringe, noting that with decreasing values of bottom oxygen (i.e., from 0.50 to 0.05 ml l−1) the number of locations with species included between the upper and lower boundaries of these fringes decreases as follows: 34% for 0.50, 25% for 0.25, 12% for 0.10, and 5% for 0.05 ml l−1. The upper and lower limits of the 0.05 ml l−1 fringe are recognised as threshold frontiers, acting as barriers between shallow and deep communities of squat lobsters in the area. The distribution of the localities where species have been collected with respect to the upper and lower boundaries of the 0.05 ml l−1 fringe clearly indicates a segregation pattern. Eight species of Munida (except M. perlata), and one each of Janetogalathea and Gastropthychus inhabit the shallow area, just above the OMZ core, with species of Munida generally found a rather long distance from this fringe. By contrast, species of Munidopsis, G. diomedeae and U. pubescens correspond to the deep area, i.e., below the OMZ core. It is suggested that the core of the OMZ in the Gulf of California serves as a vertical and latitudinal distribution filter, preventing species from freely migrating up and down or south and north.

scholarly journals Niche segregation of ammonia-oxidizing archaea and anammox bacteria in the Arabian Sea oxygen minimum zone

2011 ◽  
Vol 5 (12) ◽  
pp. 1896-1904 ◽  
Author(s):  
Angela Pitcher ◽  
Laura Villanueva ◽  
Ellen C Hopmans ◽  
Stefan Schouten ◽  
Gert-Jan Reichart ◽  
...  
Keyword(s):  
Arabian Sea ◽  
Oxygen Minimum Zone ◽  
Anammox Bacteria ◽  
Niche Segregation ◽  
Ammonia Oxidizing Archaea ◽  
Minimum Zone ◽  
Oxygen Minimum
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