2011
DOI: 10.1590/s1984-46702011000400009
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Abstract: The intertidal sea-urchin Echinometra lucunter (Linnaeus, 1758) has been submitted to diluted sea water (SW) of salinity 25, or concentrated sea water of salinity 45. In addition, ionic challenges have been offered, supplementing 25 SW with Mg2+, Ca2+ or K+, until the concentration of each of these ions would reach the level of full-strength 35 SW (control). Perivisceral coelomic fluid has been sampled after six hours in these treatments for measurements of osmolality and concentrations of Na+, Cl-, Mg2+, Ca2+… Show more

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Cited by 20 publications
(30 citation statements)
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References 37 publications
(30 reference statements)
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“…Although body fluid osmolarity was not measured, it is safe to infer from the positive weight change and previous studies (Bishop et al, 1994;Freire et al, 2011;Santos et al, 2013;Stickle and Ahokas, 1974;Vidolin et al, 2007) that osmolarity in the perivisceral fluid and body tissues decreased in the hyposaline treatment group. As predicted, the mean weight change for the hyposalinity group was always greater than the control.…”
Section: Juvenile Acclimation Studymentioning
confidence: 94%
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“…Although body fluid osmolarity was not measured, it is safe to infer from the positive weight change and previous studies (Bishop et al, 1994;Freire et al, 2011;Santos et al, 2013;Stickle and Ahokas, 1974;Vidolin et al, 2007) that osmolarity in the perivisceral fluid and body tissues decreased in the hyposaline treatment group. As predicted, the mean weight change for the hyposalinity group was always greater than the control.…”
Section: Juvenile Acclimation Studymentioning
confidence: 94%
“…Similarly, in the brittle star Ophiocomina nigra, Na þ and Cl À were isosmotic in hyposaline water, but K þ levels were maintained at higher levels (Pagett, 1980a). The sea urchin, Echinometra lucuntur, 'held gradients for Mg 2þ , Ca 2þ , and K þ ' in the coelomic fluid, in both hypo-(20%) and hyper-(48%) conditions (Freire et al, 2011). Vidolin et al (2007) found that the echinoid, Lytechinus variegatus, displayed some ionic regulation of Na þ and K þ , and Santos et al (2013) demonstrated varying degrees of osmoconforming gradients in Na þ , Mg 2þ , and K þ for three species of echinoids (L. variegatus, E. lucuntur, and Arbacia lixula).…”
Section: Biologically Important Ionsmentioning
confidence: 97%
“…However, upon a closer analysis, some gradients, although transient, are clearly revealed. Even under the typical salinity of their habitat (normal strength seawater), some occasional gradients are detected (Binyon, ; Diehl, ; Ferguson, ; Freire, Santos, & Vidolin, ; Russell, ; Santos, Castellano, & Freire, ; Stickle & Diehl, ; Vidolin, Santos‐Gouvea, & Freire, ). More frequently, ionic gradients of magnesium, potassium, and calcium are found in echinoderms, especially in dilute seawater.…”
Section: Introductionmentioning
confidence: 99%
“…More frequently, ionic gradients of magnesium, potassium, and calcium are found in echinoderms, especially in dilute seawater. Gradients of chloride and sodium also occur, albeit less frequently (Freire et al., ; Russell, ). Significant osmotic gradients are rarely present in these animals, but were already detected, especially when they were exposed to dilute seawater (Freire et al., ; Russell, ; Santos, Castellano, & Freire, ).…”
Section: Introductionmentioning
confidence: 99%
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