Microbial food web structure in the Arabian Sea: a US JGOFS study

Phytoplankton community structure in relation to vertical stratification along a north‐south gradient in the Northeast Atlantic Ocean

“…To estimate the contribution of the different phytoplankton groups to carbon biomass, carbon-conversion factors were applied to FCM cell counts. Specifically, cell counts were transformed assuming spherical diameters equivalent to the average cell size determined from size fractionation and applying conversion factors of 237 fg C lm 23 (Worden et al 2004) and 196.5 fg C lm 23 for pico-and nano-sized plankton (Garrison et al 2000), respectively.…”

High-resolution imaging of pelagic bacteria by Atomic Force Microscopy and implications for carbon cycling

“…However, various studies have reported a different C to volume ratio, presumably because of a difference in methods (Lee and Fuhrman, 1987;Simon and Azam, 1989;Garrison et al, 2000;Posch et al, 2001;Gundersen et al, 2002). (See Posch et al, 2001 for a detailed discussion on volume-to-C conversion factors.)…”

“…The AFM-based detection of high C bacteria has implications for understanding and quantifying size-dependent grazing on bacteria by the protists. Further, bacteria C production by 3 Hthymidine incorporation requires a knowledge of per-cell C (estimates of average values often used are 11 fg C per cell (Garrison et al, 2000) or 20 fg C per cell (Simon and Azam, 1989)). AFM-based estimates could result in an upward revision in the contribution of a large cell class in bacteria production and C flux through the microbial loop.…”

Multiscale control of bacterial production by phytoplankton dynamics and sea ice along the western Antarctic Peninsula: A regional and decadal investigation

“…Time series 16 approaches have been undertaken successfully in a number of locations, but typically only one or 17 a few fixed stations are observed repeatedly over longer time spans (e.g., Fuhrman et al 2006;18 Morris et al 2005;Li, 2009). In contrast more geographically extensive studies tend to be 19 limited to a few seasons over one or two years (e.g., Garrison et al, 2000;Ducklow et al, 20 2001a;Straza et al 2009) . The Long Term Ecological Research program enables an 21 unprecedented examination, in terms of geographic and temporal coverage, of the 22 interrelationships among climate, sea ice, hydrography, plankton ecology, biogeochemical 23 processes and microbial dynamics (Ducklow et al, 2006a;Karl et al, 1996).…”