Food web structure and biogeochemical processes during oceanic phytoplankton blooms: An inverse model analysis

Life Under Antarctic Pack Ice: A Krill Perspective

“…The role of Antarctic krill as one of the dominant macrozooplanktonic grazers, particularly of the larger phytoplankton, suggests that grazing by krill affects phytoplankton community composition and is a signifi cant loss term in some years (Ross et al, 1998;Garibotti et al, 2003;Daniels et al, 2006). Daniels et al (2006), in a network analysis of the pelagic food web on the shelf west of the Antarctic Peninsula, found that in years of high primary production and high krill abundance, more than 50% of the large phytoplankton cells were ingested by Antarctic krill.…”

“…Daniels et al (2006), in a network analysis of the pelagic food web on the shelf west of the Antarctic Peninsula, found that in years of high primary production and high krill abundance, more than 50% of the large phytoplankton cells were ingested by Antarctic krill. In addition, its production of large fast-sinking fecal pellets (Ross et al, 1985;Fowler and Small, 1972;Cadée et al, 1992;González, 1992;Turner, 2002) enhances its contribution to carbon sequestration (Smetacek et al, 2004).…”

Carbon fluxes and pelagic ecosystem dynamics near two western Antarctic Peninsula Adélie penguin colonies: an inverse model approach

“…We constructed a steady-state inverse model of the WAP pelagic food web based on the earlier models by Ducklow et al (2006) and Daniels et al (2006). The inverse model provides a snapshot of the system each January, and the model structure depends on data availability to constrain flows between compartments.…”

“…Antarctic coastal waters exhibit high rates of primary production (over 2 g C m −2 d −1 and 100 to 200 g C m −2 yr −1 tic waters (Hart 1934, Huntley et al 1991; however, studies have highlighted the importance of microbial processes (bacterial secondary production, microzooplankton grazing) affecting the fate of primary production (Hewes et al 1985, El Sayed 1988, Daniels et al 2006. While krill prey mostly on diatoms, microzooplankton are able to prey on smaller size phytoplankton and, like bacteria, are part of the microbial food web.…”

A decade of synthesis and modeling in the US Joint Global Ocean Flux Study

“…In an attempt to avoid this pitfall, Daniels et al (2006) and Richardson et al (2006) used an inverse approach to construct best-estimates for specified carbon and nitrogen flow networks containing the key components measured in various JGOFS and other field studies. In their approach, the aggregate flows between model compartments are minimized, a strategy that tends to even out diverging flow magnitudes (large flows get smaller and small ones larger).…”