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Ion fluxes in silver catfish (Rhamdia quelen) juveniles exposed to different dissolved oxygen levels Neotropical Ichthyology
Rosso,Felipe Link de; Bolner,Keidi C. S.; Baldisserotto,Bernardo.
Low dissolved oxygen levels in the water (hypoxia) can be provoked by oxygen consumption by fish and other organisms, organic matter decomposition, phytoplankton blooms, and temperature increase. The objective of the present study was to investigate Na+, Cl-, K+, and ammonia fluxes in silver catfish (Rhamdia quelen) exposed to different dissolved oxygen levels. Juveniles (9 ± 1g) maintained at 6.0 mg.L-1 dissolved oxygen were transferred to four 40 L aquaria with different dissolved oxygen levels (in mg.L-1): 6.0, 4.5, 3.5, and 2.5. In another series of experiments, juveniles were acclimated at 6.0 or 2.5 mg.L-1 dissolved oxygen levels, and then placed in two 40 L aquaria with 6.0 mg.L-1 dissolved oxygen. For both series of experiments, 1, 24, 48 or 120 h...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Oxygen saturation; Osmoregulation; Jundiá.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252006000400007
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Oxygen Saturation Surrounding Deep Water Formation Events in the Labrador Sea From Argo-O-2 Data ArchiMer
Wolf, Mitchell K.; Hamme, Roberta C.; Gilbert, Denis; Yashayaev, Igor; Thierry, Virginie.
Deep water formation supplies oxygen-rich water to the deep sea, spreading throughout the ocean by means of the global thermohaline circulation. Models suggest that dissolved gases in newly formed deep water do not come to equilibrium with the atmosphere. However, direct measurements during wintertime convection are scarce, and the controls over the extent of these disequilibria are poorly quantified. Here we show that, when convection reached deeper than 800 m, oxygen in the Labrador Sea was consistently undersaturated at -6.1% to -7.6% at the end of convection. Deeper convection resulted in greater undersaturation, while convection ending later in the year resulted in values closer to equilibrium, from which we produce a predictive relationship. We use...
Tipo: Text Palavras-chave: Oxygen saturation; Convection; Argo; Labrador Sea; Deep water formation.
Ano: 2018 URL: http://archimer.ifremer.fr/doc/00442/55329/56829.pdf
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