Osmoregulation and muscle water control in vitro facing salinity stress of the Amazon fish Oscar Astronotus ocellatus (Cichlidae)

Use of osmoregulatory ability to predict invasiveness of the Indo-Pacific swimming crab Charybdis hellerii (A. Milne-Edwards, 1867) an invader in Southern Brazil

“…Osovitz and Hofmann, 2007;Rahel and Olden, 2008;Blackburn et al, 2011;Gutierre et al, 2014;Rocha et al, 2017). With respect to estuaries, salinity is one of the main abiotic factors, and variations in salinity may limit the spread of many native and nonnative animals (e.g., Fowler et al, 2011;Gutierre et al, 2014Gutierre et al, , 2016Gutierre et al, , 2017Rocha et al, 2017).…”

“…When hemolymph osmolality changes, all cells will be osmotically challenged and will be induced to regulate their volume by intracellular isosmotic regulation (IIR), thus maintaining cell volume homeostasis (e.g., Péqueux, 1995;Freire et al, 2008a;2008b;Charmantier et al, 2009). Moreover, when animals are exposed to the limit of their salinity tolerances, changes in the concentration of the extracellular medium can impose a large osmotic stress on the cells, and its ability to activate IIR may fail because it has reached the physiological limit (Freire et al, 2008b;Gutierre et al, 2017). Osmoregulatory ability allied to salinity tolerance could then be proposed as a useful indicator of the invasive potential of animals exposed to variations in salinities in estuaries (e.g., Gutierre et al, 2014;Rocha et al, 2017).…”