Temporal variation of the concentration and biochemical composition of seston within the Humboldt Current System off northern Chile (21°S)

Temporal variation of seston biomarkers within the Humboldt Current System off northern Chile (21°S): first simultaneous records on fatty acids,n-alkanes and glycerol-dialkyl-glycerol-tetraethers (GDGT)

“…Physical-chemical variables in the water column and major biochemical characteristics of seston can also be seen also in Isla et al [44,48]. Part of the study complements other previously published studies [16,36,44,47,48].…”

“…The upwelled waters are rich in nutrients and fuel high primary productivity (1-19.9 gC m À2 d À1 [3][4][5]), which triggers a high demand for oxygen from bacterial decomposers, creating an Oxygen Minimum Zone or OMZ (50.5 ml O 2 L À1 , [6,7]) at interpreted as biomarkers to evaluate food quality for secondary production, in order to understand the dominance of certain phytoplanktonic groups, and to track the potential origin of organic matter. The present study builds on others conducted previously using the same sampling locations to described the phytoplankton community and the physicalchemical variation at Chipana Bay [16,44,46,47].…”

“…Temperature, salinity and dissolved oxygen profiles were recorded daily from near bottom to surface waters [44,48].…”

“…The continuous CTDO-Fluorescence profiles were used to determine the sampling depths to obtain the seston samples. Physical data are also available in the same zone from previous studies [16,44,47] Seston samples were recovered from Whatman GF/F filters (three to six filters per depth and sampling, around 0.4-0.7 mm pore size; pre-combusted at 450 C for 8 hours) after filtering 1.5-3 L of seawater collected with Niskin Bottles. The water layers under study were the surface (10-15 m depth), oxycline (20-50 m depth), intermediate (65 m depth) and bottom (89 m depth) water layers.…”

Availability and utilization of waste fish feed by mussels Mytilus edulis in a commercial integrated multi-trophic aquaculture (IMTA) system: A multi-indicator assessment approach

“…High protein, lipid and PUFA contents are indicators of good dietary quality for bivalves (Navarro and Thompson, 1995;Ríos et al, 1998;Budge et al, 2001;Alkanani et al, 2007;Isla et al, 2010Isla et al, , 2012. Our results showed significantly higher levels of chlorophyll at the IMTA farm relative to the monoculture site, although these levels were within the wide range reported for the Bay of Fundy (MacDonald et al, 2011;Lander et al, 2013).…”