Biography:

One of their most recent publications is Zooplankton vertical migration and the active transport of dissolved organic and inorganic nitrogen in the Sargasso Sea. Which was published in journal Deep Sea Research Part I: Oceanographic Research Papers.

More information about Deborah K Steinberg research including statistics on their citations can be found on their Copernicus Academic profile page.

Deborah K Steinberg's Articles: (2)

Zooplankton vertical migration and the active transport of dissolved organic and inorganic nitrogen in the Sargasso Sea

AbstractIn the past decade a series of studies have shown that the active transport of inorganic carbon and nutrients by diel vertical migration of zooplankton is an important component of the biological pump. Less well known is how excretion of dissolved organic material (DOM) by migrating zooplankton enhances this export by creating a migratory DOM pump. We measured ammonia (NH4+) and dissolved organic nitrogen (DON) excretion by common vertically migrating zooplankton at the US JGOFS Bermuda Atlantic Time-series Study (BATS) station in the Sargasso Sea. The inclusion of DON excretion in our study builds on published research on migratory transport and excretion of NH4+ and dissolved organic carbon (DOC) at BATS. On average, excretion of DON by migrating organisms is 32% (range=15–66%) of the total dissolved nitrogen (TDN) excreted, significantly augmenting previously documented vertical flux of inorganic nitrogen by migrant zooplankton. This process is discussed in the context of the BATS region, where TDN transport by migratory zooplankton is compared to nitrogen export via sinking of PON and to primary production. Estimates of active transport of TDN (NH4++DON) by migrators averaged 13%, 18%, and 27% of the mean monthly sinking PON flux (for the period 1989–1999) at 150, 200, and 300 m, respectively. However, maximum transport of TDN by migrators was from 1.6 to 3.5 times greater than the sinking PON flux at these three depths. On average, the migratory TDN flux was a small proportion (2%) of primary production, but reached a maximum of 19%. Comparison of N excretion data from this study with C and P metabolism data from our other studies in the region indicates that molar remineralization ratios of C, N, and P by migrators differ among species and are not always at the classic Redfield ratio. This may have implications for non-Redfield cycling of nutrients in the western Sargasso Sea.

Overview of the US JGOFS Bermuda Atlantic Time-series Study (BATS): a decade-scale look at ocean biology and biogeochemistry

AbstractThe Bermuda Atlantic Time-series Study (BATS) commenced monthly sampling in October 1988 as part of the US Joint Global Ocean Flux Study (JGOFS) program. The goals of the US JGOFS time-series research are to better understand the basic processes that control ocean biogeochemistry on seasonal to decadal time-scales, determine the role of the oceans in the global carbon budget, and ultimately improve our ability to predict the effects of climate change on ecosystems. The BATS program samples the ocean on a biweekly to monthly basis, a strategy that resolves major seasonal patterns and interannual variability. The core cruises last 4–5 d during which hydrography, nutrients, particle flux, pigments and primary production, bacterioplankton abundance and production, and often complementary ancillary measurements are made. This overview focuses on patterns in ocean biology and biogeochemistry over a decade at the BATS site, concentrating on seasonal and interannual changes in community structure, and the physical forcing and other factors controlling the temporal dynamics. Significant seasonal and interannual variability in phytoplankton and bacterioplankton production, biomass, and community structure exists at BATS. No strong relationship exists between primary production and particle flux during the 10 yr record, with the relationship slightly improved by applying an artificial lag of 1 week between production and flux. The prokaryotic picoplankton regularly dominate the phytoplankton community; diatom blooms are rare but occur periodically in the BATS time series. The increase in Chl a concentrations during bloom periods is due to increases by most of the taxa present, rather than by any single group, and there is seasonal succession of phytoplankton. The bacterioplankton often dominate the living biomass, indicating the potential to consume large amounts of carbon and play a major ecological role within the microbial food web. Bacterial biomass, production, and specific growth rates are highest during summer. Size structure and composition of the plankton community may be an important factor controlling the quality of dissolved organic matter produced and could affect production of bacterioplankton biomass. Larger heterotrophic plankton play an integral role in the flux of material out of the euphotic zone at BATS. Protozoans are abundant and can constitute a sizable component of sinking flux. Zooplankton contribute significantly to flux via production of rapidly sinking fecal pellets, and vertically migrating zooplankton can actively transport a significant amount of dissolved organic and inorganic carbon and nitrogen to deep water. An important question that remains to be further addressed at BATS is how larger climatological events drive some of the interannual variability in the biogeochemistry.

Advertisement
Join Copernicus Academic and get access to over 12 million papers authored by 7+ million academics.
Join for free!

Contact us