Heavy metal concentrations and biomarkers of oxidative stress in native mussels (Mytilus edulis chilensis) from Beagle Channel coast (Tierra del Fuego, Argentina)

Seasonal and spatial variation of mesozooplankton biomass in Ushuaia and Golondrina bays (Beagle Channel, Argentina))

“…Fernandez-Severini and Hoffmeyer (2005) reported the presence of these species in summer for Ushuaia and Golondrina bays. These authors mentioned that calanoid copepods were the dominant species within mesozooplankton followed by the cyclopoid copepod O. similis (FERNANDEZ-SEVERINI;HOFFMEYER, 2005). All these species mentioned above, have also been reported by Guglielmo and Ianora (1995) and Mazzocchi and Ianora (1999) for the Magellan region.…”

“…4). The observed increase in chlorophyll a values in both bays during late springsummer reflect a greater phytoplankton activity favored by an increase in temperature, optimal light condition, and high concentration of nutrients, especially near the coast in both bays (FERNANDEZ-SEVERINI;HOFFMEYER, 2005;BIANCALANA;TORRES, 2011;GIL et al, 2011). The highest mesozooplankton biomass observed in UB during late summer, apparently follows the annual phytoplankton maximum (FERNANDEZ-SEVERINI; HOFFMEYER, 2005).…”

“…Also, mesozooplankton supports the marine ecosystem functioning by controlling primary production and, hence, the transfer of carbon through the pelagic food web (ESCRIBANO et al, 2007). Thus, estimation of mesozooplankton biomass and density is relevant from both fisheries and biological oceanography viewpoints.…”

“…Particularly, the northern zone of UB, has been suffering significant alterations as a result of domestic, industrial and harbor activities. As UB, GB has received noticeable contributions of wastewater through the sewage diffuser situated on the eastern coast of this bay (AMIN et al, 2011a, b;DUARTE et al, 2011;GIL et al, 2011). In addition, the coast of GB has suffered the increased development of surrounding urban centers and tourism infrastructure.…”

“…As a result, coastal waters presented relatively moderate levels of polluted with sporadic eutrophication processes (TORRES et al, 2009;AMIN et al, 2011b;DUARTE et al, 2011;GIL et al, 2011). The increase of nutrients, especially nitrates, nitrites and phosphates, products of sewage discharges and defrosting events, produces an enrichment of water and a phytoplankton biomass enhancement (GIL et al, 2010;TORRES et al, 2009).…”