Depth-stratified phytoplankton dynamics in Cyclone Opal, a subtropical mesoscale eddy

Influences of oceanographic and meteorological features on reef fish recruitment in Hawai’i

“…Although the mechanisms of formation and propagation of these lee eddies are still a matter of debate (Calil et al 2008), a key forcing factor, at least of the cyclonic eddies, appears to be the northeast trade winds as they pass between the islands of Maui and Hawai'i (Lumpkin 1998. The cold-core, cyclonic eddies are important agents in bringing nutrient-rich deeper waters to the euphotic zone and hence increasing biological activity (Lobel & Robinson 1986, Bidigare et al 2003, Landry et al 2008, Mahaffey et al 2008). This increased nutrient flux, particularly within the oligotrophic subtropical gyre waters of the Hawaiian Islands, could potentially increase survival and subsequent recruitment of coral reef fishes if the eddy persists close to the shore long enough for the fish larvae to complete their development and return to reefs (Limouzy-Paris et al 1997).…”

Mesoscale physical–biological–biogeochemical linkages in the open ocean: An introduction to the results of the E-Flux and EDDIES programs

“…were ~ 100 times higher in biomass (Bibby et al, 2008;Brown et al, 2008) and ~ 60 times higher in diatom pigment concentrations than that observed in ambient waters. Enhanced phytoplankton growth rates induced a shift from net heterotrophy to net autotrophy (McAndrew et al, 2008) and were accompanied by an increase in microzooplankton grazing (Landry et al, 2008a). Noble et al (2008) describe mesoscale variations in the distribution of cobalt, manganese, and iron, and suggest an eddy-driven concentrating mechanism to explain their Cyclone Opal observations.…”

“…These studies also include the results of model formulations that confirm the importance of winds and topography on Hawaiian eddy formation and propagation (Calil et al, 2008). The second section delves into the plankton community response, with papers discussing nutrient distributions (Li and Hansell, 2008;Rii et al, 2008), plankton community structure (Bibby et al, 2008;Brown et al, 2008;Ewart et al, 2008;Rii et al, 2008), growth, grazing, and metabolic balance, (Bibby et al, 2008;Landry et al, 2008a;McAndrew et al, 2008) and the influence of eddies on higher trophic levels (Goldthwait and Steinberg, 2008;Landry et al, 2008b). The third section concentrates on the resulting impacts on biogeochemical cycling and export.…”

Temporal dynamics of carbon flow through the microbial plankton community in a coastal upwelling system off northern Baja California, Mexico

“…The typical linear relationship between k i and D i allowed estimation of m and μ daily rates from the slopes and intercepts of the trendlines, respectively. However, deviations of linearity were seen on a few occasions (mainly for the pigment data), and the μ and m rates for these experiments were estimated from 2 dilution treatments (100 and 30%) following the 2-treatment dilution approach of Landry et al (2008Landry et al ( , 2009). Saturated grazing was also seen when a k i estimate for the undiluted treatment exceeded the estimates for the 30 and 10% treatments, as described by Teixeira & Figueiras (2009).…”

“…1) Landry et al (2008), we used an abbreviated 3-treatment dilution protocol (100, 30 and 10% of whole seawater, without an addition of nutrients and non-replicated) to estimate rates of phytoplankton growth and microzooplankton grazing. Based on in situ fluorescence profiles, seawater for the experiments was collected in 5 l Niskin bottles from the euphotic zone at the subsurface chlorophyll maximum (SCM) and from the depths above and below the SCM.…”