Document Type
Article
Publication Date
2-1-2016
Publication Title
Journal of Great Lakes Research
Volume
42
Issue
1
First Page
39
Keywords
Ammonia oxidation, AmoA, CARD-FISH, Lake Erie, Lake Superior, Nitrification
Last Page
49
Abstract
Oligotrophic Lake Superior and mesotrophic Lake Erie are trophic end members of the hydrologically connected Laurentian Great Lakes system, and as such exhibit different profiles of dissolved nitrogen species. Nitrification in Lake Superior has led to increasing nitrate concentrations over the past century, as opposed to Erie, where nitrate inventories have declined due to denitrification. In this study, we examined the abundance and diversity of nitrifying microbes involved in the oxidation of ammonia to nitrite, and nitrite to nitrate. By in situ hybridization methods, we enumerated the major planktonic ammonia oxidizing bacteria (AOB) and archaea (AOA) during a July 2011 cruise from Lake Superior to Lake Erie. In Lake Superior, AOA dominated compared to AOB, typically exceeding 5 × 103 mL-1, whereas in Erie, AOB were more abundant than AOA. These data parallel prior work on Lake Superior and Lake Erie sediments, in which AOA are far more abundant in Superior, but AOB dominate in Erie. The lakes were sampled during stratification, and AOA and AOB were largely restricted to the hypolimnion, consistent with the observation that ammonia oxidizers are photoinhibited in surface waters. In Lakes Superior and Erie, we also detected nitrite oxidizing bacteria (NOB) in a pattern paralleling AOA/AOB abundance. Phylogenetic analysis of archaeal 16S rRNA revealed that the planktonic archaea of Lake Superior are members of the ammonia oxidizing Group I.1a Thaumarchaeota most closely related to Nitrosoarchaeum limnia. These AOA are distinct from the Group I.1a AOA in Lake Superior sediments. The major AOB of Lake Erie form a subcluster within the genus Nitrosospira.
DOI
10.1016/j.jglr.2015.11.007
ISSN
03801330
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.
Recommended Citation
Mukherjee, Maitreyee; Ray, Anirban; Post, Anton F.; McKay, Robert Michael; and Bullerjahn, George S.. (2016). Identification, enumeration and diversity of nitrifying planktonic archaea and bacteria in trophic end members of the Laurentian Great Lakes. Journal of Great Lakes Research, 42 (1), 39-49.
https://scholar.uwindsor.ca/glierpub/566
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