Browsing by Author "Daneri, Giovanni"
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Item Low spring primary production and microplankton carbon biomass in sub- antarctic patagonian channels and fjords (50–53°S)(Inst. Arctic Alpine Res., 2018-10-15) Iriarte, José Luis; Cuevas, Luis Antonio; Cornejo, Fernanda; Silva, Nelson; González, Humberto E.; Castro, Leonardo; Montero, Paulina; Vargas, Cristian A.; Daneri, GiovanniIt is relevant to understand the processes and factors that modulate the efficiency of the carbon pump throughout the ecosystem of Patagonian fjords. Spatial variability of primary productivity and bacteria-microplankton biomass was assessed in relation to inorganic nutrients and stratification across nearshore zones of southern Patagonia (50-53 degrees S) in austral spring 2009. Estimates of primary productivity (300-500 mg C m(-2) d(-1)) and phytoplankton biomass (9-180 mg chlorophylla m(-2)) were low at offshore and inshore waters. Synergistic effects of low silicic acid concentrations and poor light penetration because of salinity-driven stratification of glacier meltwater in springtime appeared to negatively affect phytoplankton carbon biomass and primary production in this sub-Antarctic region. The knowledge of the relative importance of nutrient sources and light is especially significant for Patagonian glacier-fjord systems that are expected to receive higher freshwater inputs and will be more stratified in the future.