Denitrification Enzyme Activity of Fringe Salt Marshes in New England (USA)

2004 ◽  
Vol 33 (3) ◽  
pp. 1144 ◽  
Author(s):  
Cathleen Wigand ◽  
Richard A. McKinney ◽  
Marnita M. Chintala ◽  
Michael A. Charpentier ◽  
Peter M. Groffman
2021 ◽  
Vol 1 (1) ◽  
Author(s):  
A. E. Bernhard ◽  
J. Beltz ◽  
A. E. Giblin ◽  
B. J. Roberts

AbstractFew studies have focused on broad scale biogeographic patterns of ammonia oxidizers in coastal systems, yet understanding the processes that govern them is paramount to understanding the mechanisms that drive biodiversity, and ultimately impact ecosystem processes. Here we present a meta-analysis of 16 years of data of ammonia oxidizer abundance, diversity, and activity in New England (NE) salt marshes and 5 years of data from marshes in the Gulf of Mexico (GoM). Potential nitrification rates were more than 80x higher in GoM compared to NE marshes. However, nitrifier abundances varied between regions, with ammonia-oxidizing archaea (AOA) and comammox bacteria significantly greater in GoM, while ammonia-oxidizing bacteria (AOB) were more than 20x higher in NE than GoM. Total bacterial 16S rRNA genes were also significantly greater in GoM marshes. Correlation analyses of rates and abundance suggest that AOA and comammox are more important in GoM marshes, whereas AOB are more important in NE marshes. Furthermore, ratios of nitrifiers to total bacteria in NE were as much as 80x higher than in the GoM, suggesting differences in the relative importance of nitrifiers between these systems. Communities of AOA and AOB were also significantly different between the two regions, based on amoA sequences and DNA fingerprints (terminal restriction fragment length polymorphism). Differences in rates and abundances may be due to differences in salinity, temperature, and N loading between the regions, and suggest significantly different N cycling dynamics in GoM and NE marshes that are likely driven by strong environmental differences between the regions.


2011 ◽  
Vol 434 ◽  
pp. 229-237 ◽  
Author(s):  
KB Gedan ◽  
AH Altieri ◽  
MD Bertness

Author(s):  
David Ehrenfeld

On all but one of the field trips in my Field Ecology course, I take my students to the sorts of places that they have been to before: the beach, the pinelands, the Highlands forest, farms, old fields, streams, salt marshes, suburbs. But on the third trip, after the ones to the campus and to the experimental plots at Hutcheson Forest, we go to a place that is, for all its superficial familiarity, altogether different and exotic. This trip is to America’s deserted empire, what the person who knew it best, ecologist Frank Egler, described as the Right of way Domain. Right-of-way land comprises at least fifty to seventy-five million acres in the United States, an area larger than New England. It is disposed as long strips of property along railroad tracks, roads, and canals; under power lines; and above buried pipelines. Many of these rights-of-way, even those in heavily populated areas, are scarcely ever visited by people—they are cut off from human presence by fences, no-trespassing signs, patrolling police, dense vegetation, and a scarcity of reasons to set foot in them. True, some abandoned rights-of-way have been put to use. The tow-path and adjacent land along the old Delaware–Raritan Canal, which winds its way for many miles through central New Jersey, has become a very long, very narrow, very popular state park. Indeed, this is the park that has helped protect the forest along the Millstone River, which I de-scribed earlier. Hunters love the rights-of-way under power lines, which attract deer and small game. And disused railroad lines have been turned into foot and bike trails in several parts of the country. But many rights-of-way, totaling a huge amount of land, go for months or years without feeling a human step or hearing a human voice. These places are them-selves neither urban nor suburban nor rural; neither settled nor wilder-ness. They are a quintessential part of what author James Howard Kunstler has called “the geography of nowhere.” In my right-of-way trip we start with a boggy strip of land above a transcontinental gas pipeline.


2013 ◽  
Vol 37 (2) ◽  
pp. 354-368 ◽  
Author(s):  
Robert E. Vincent ◽  
David M. Burdick ◽  
Michele Dionne

1953 ◽  
Vol 105 (3) ◽  
pp. 395-401 ◽  
Author(s):  
JOHN L. BLUM ◽  
JOHN T. CONOVER
Keyword(s):  

Estuaries ◽  
2003 ◽  
Vol 26 (6) ◽  
pp. 1494-1504 ◽  
Author(s):  
Cathleen Wigand ◽  
Richard A. McKinney ◽  
Michael A. Charpentier ◽  
Marnita M. Chintala ◽  
Glen B. Thursby

2007 ◽  
Author(s):  
Brittina A. Argow ◽  
Zoe J. Hughes ◽  
Duncan M. FitzGerald
Keyword(s):  

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