Plasma and erythrocyte solute properties of juvenile bull sharks, Carcharhinus leucas, acutely exposed to increasing environmental salinity

Pillans, Richard D., Anderson, W. Gary, Good, Jonathan P., Hyodo, Susumu, Takei, Yoshio, Hazon, Neil and Franklin, Craig E. (2006) Plasma and erythrocyte solute properties of juvenile bull sharks, Carcharhinus leucas, acutely exposed to increasing environmental salinity. Journal of Experimental Marine Biology and Ecology, 331 2: 145-157. doi:10.1016/j.jembe.2005.10.013


Author Pillans, Richard D.
Anderson, W. Gary
Good, Jonathan P.
Hyodo, Susumu
Takei, Yoshio
Hazon, Neil
Franklin, Craig E.
Title Plasma and erythrocyte solute properties of juvenile bull sharks, Carcharhinus leucas, acutely exposed to increasing environmental salinity
Formatted title
Plasma and erythrocyte solute properties of juvenile bull sharks, Carcharhinus leucas, acutely exposed to increasing environmental salinity

Journal name Journal of Experimental Marine Biology and Ecology   Check publisher's open access policy
ISSN 0022-0981
Publication date 2006-04-18
Year available 2006
Sub-type Article (original research)
DOI 10.1016/j.jembe.2005.10.013
Volume 331
Issue 2
Start page 145
End page 157
Total pages 13
Editor S. Shumway
R. Hughes
S. Thrush
Place of publication Dordrecht, The Netherland
Publisher Elsevier
Language eng
Subject C1
11 Medical and Health Sciences
Formatted abstract
Plasma and erythrocyte solute properties were examined in freshwater (FW) acclimated juvenile Carcharhinus leucas following acute transfer to 75% seawater (SW), and 100% SW. Blood samples were taken at 0, 12 and 96 h following transfer to 75% SW and 24 and 72 h after transfer to 100% SW. A control group in FW was subjected to the same sampling regime. Upon transfer of C. leucas to 75% and 100% SW, plasma Na+, Cl, K+, Mg2+, Ca2+, urea and TMAO concentrations all increased significantly but disproportionately. Plasma Na+ and Cl increased immediately, followed by an increase in plasma urea. Erythrocyte urea and TMAO concentrations increased significantly following transfer to 75% and 100% SW; however, changes in erythrocyte inorganic ion concentrations were insignificant. Haematocrit, haemoglobin and mean cell haematocrit did not differ significantly after transfer to seawater; however, plasma water was slightly reduced after 24 and 72 h in 100% SW. Red blood cell (RBC) water content was elevated 24 h after transfer to 100% SW but returned to FW levels after 72 h. These results demonstrate that the transfer from 75% to 100% SW presents C. leucas with a greater osmoregulatory challenge than transfer from FW to 75% SW, despite the larger concentration gradient in the latter. In summary, C. leucas tolerate rapid and significant increases in salinity by rapidly increasing plasma osmolality to be hyperosmotic to the environment whilst maintaining a tight regulation of their intracellular fluid environment.
Keyword Elasmobranch
Euryhaline
Osmoregulation
Salinity transfer
Plasma
Erythrocyte
Ecology
Marine & Freshwater Biology
Stingray Dasyatis-sabina
Skate Raja-erinacea
Fresh-water
Q-Index Code C1

 
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Created: Thu, 05 Jun 2008, 21:58:42 EST by Thelma Whitbourne on behalf of School of Biomedical Sciences