D. Karl

Publications543
h-index115
Citations49,839
Highly Influential Citations3,678
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Nitrogen Cycles: Past, Present, and Future
This paper contrasts the natural and anthropogenic controls on the conversion of unreactive N2 to more reactive forms of nitrogen (Nr). A variety of data sets are used to construct global N budgets…
VERTEX: carbon cycling in the northeast Pacific
The Sorcerer II Global Ocean Sampling Expedition: Northwest Atlantic through Eastern Tropical Pacific
TLDR
A metagenomic study of the marine planktonic microbiota in which surface (mostly marine) water samples were analyzed as part of the Sorcerer II Global Ocean Sampling expedition, which yielded an extensive dataset consisting of 7.7 million sequencing reads.
Archaeal dominance in the mesopelagic zone of the Pacific Ocean
TLDR
A year-long study of the abundance of two specific archaeal groups (pelagic euryarchaeota and pelagic crenarchAEota) in one of the ocean's largest habitats suggests that most pelagic deep-sea microorganisms are metabolically active and the results suggest that the global oceans harbour approximately 1.3 × 1028Archaeal cells, and 3.1‬×‬10 28 bacterial cells.
Phosphate depletion in the western North Atlantic Ocean.
TLDR
It is hypothesized that nitrogen versus phosphorus limitation of primary production in the present-day ocean may be closely linked to iron supply through control of dinitrogen (N2) fixation, an iron-intensive metabolic process.
Community Genomics Among Stratified Microbial Assemblages in the Ocean's Interior
TLDR
Genomic analyses of planktonic microbial communities in the North Pacific Subtropical Gyre, from the ocean's surface to near–sea floor depths, suggested depth-variable community trends in carbon and energy metabolism, attachment and motility, gene mobility, and host-viral interactions.
Quantitative distribution of presumptive archaeal and bacterial nitrifiers in Monterey Bay and the North Pacific Subtropical Gyre.
TLDR
The data suggest that amoA-containing Crenarchaea are more phylogenetically diverse than previously reported and distributional patterns of planktonic Cren archaeal and Nitrospina species suggest potential metabolic interactions between these groups in the ocean's water column.
Physical and biogeochemical modulation of ocean acidification in the central North Pacific
TLDR
It is suggested that physical and biogeochemical processes alter the acidification rate with depth and time and must therefore be given due consideration when designing and interpreting ocean pH monitoring efforts and predictive models.
Elemental composition of marine Prochlorococcus and Synechococcus: Implications for the ecological stoichiometry of the sea
TLDR
The results suggest that Prochlorococcus and Synechococcus may have relatively low P requirements in the field, and thus the particulate organic matter they produce would differ from the Redfield ratio (106C : 16N : 1P) often assumed for the production of new particulates organic matter in the sea.
Present and future global distributions of the marine Cyanobacteria Prochlorococcus and Synechococcus
TLDR
The global niche models suggest that oceanic microbial communities will experience complex changes as a result of projected future climate conditions, and these changes may have large impacts on ocean ecosystems and biogeochemical cycles.
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