Secretion of Rectal Gland Fluid in the Atlantic Stingray, Dasyatis sabina

Copeia ◽  
1977 ◽  
Vol 1977 (3) ◽  
pp. 585 ◽  
Author(s):  
Barry E. Beitz
Keyword(s):  
Rectal Gland ◽  
Dasyatis Sabina ◽  
Atlantic Stingray

Effects of environmental salinity on Na(+)/K(+)-ATPase in the gills and rectal gland of a euryhaline elasmobranch (Dasyatis sabina)

2000 ◽  
Vol 203 (19) ◽  
pp. 2957-2966 ◽  
Author(s):  
P.M. Piermarini ◽  
D.H. Evans
Keyword(s):  
Atpase Activity ◽  
Fresh Water ◽  
Sea Water ◽  
Rectal Gland ◽  
Environmental Salinity ◽  
Dasyatis Sabina ◽  
Atpase Assay ◽  
Atlantic Stingray ◽  
Rectal Glands ◽  
Nacl Excretion

Changes in Na(+)/K(+)-ATPase activity and abundance associated with environmental salinity were investigated in the gills and rectal gland of the Atlantic stingray Dasyatis sabina. Using a ouabain-specific ATPase assay and western blotting, we found that stingrays from fresh water had the highest activity and highest relative abundance of Na(+)/K(+)-ATPase in the gills. Using immunohistochemistry, we also found that gills from freshwater stingrays had the greatest number of Na(+)/K(+)-ATPase-rich cells. When freshwater stingrays were acclimated to sea water for 1 week, the activity and abundance of Na(+)/K(+)-ATPase and the number of Na(+)/K(+)-ATPase-rich cells decreased in the gills. In seawater stingrays, the branchial activity and abundance of Na(+)/K(+)-ATPase and the number of Na(+)/K(+)-ATPase-rich cells were further reduced. In rectal glands, the activity and abundance of Na(+)/K(+)-ATPase were lower in freshwater animals than in seawater-acclimated and seawater stingrays, both of which had equivalent levels. These findings suggest that salinity-associated changes in gill and rectal gland Na(+)/K(+)-ATPase activity are due to changes in the abundance of Na(+)/K(+)-ATPase. We conclude that the gills may be important for active ion uptake in fresh water, while the rectal gland is important for active NaCl excretion in sea water. The results from this study are the first to demonstrate an effect of environmental salinity on Na(+)/K(+)-ATPase expression in the gills and rectal gland of an elasmobranch.

Pendrin immunoreactivity in the gill epithelium of a euryhaline elasmobranch

2002 ◽  
Vol 283 (4) ◽  
pp. R983-R992 ◽  
Author(s):  
Peter M. Piermarini ◽  
Jill W. Verlander ◽  
Ines E. Royaux ◽  
David H. Evans
Keyword(s):  
Collecting Duct ◽  
Apical Region ◽  
Intercalated Cells ◽  
Cortical Collecting Duct ◽  
Gill Epithelium ◽  
Dasyatis Sabina ◽  
Proton Atpase ◽  
Atlantic Stingray ◽  
Freshwater Stingray ◽  
Gill Lamellae

Pendrin is an anion exchanger in the cortical collecting duct of the mammalian nephron that appears to mediate apical Cl−/HCO[Formula: see text]exchange in bicarbonate-secreting intercalated cells. The goals of this study were to determine 1) if pendrin immunoreactivity was present in the gills of a euryhaline elasmobranch (Atlantic stingray, Dasyatis sabina), and 2) if branchial pendrin immunoreactivity was influenced by environmental salinity. Immunoblots detected pendrin immunoreactivity in Atlantic stingray gills; pendrin immunoreactivity was greatest in freshwater stingrays compared with freshwater stingrays acclimated to seawater (seawater acclimated) and marine stingrays. Using immunohistochemistry, pendrin-positive cells were detected on both gill lamellae and interlamellar regions of freshwater stingrays but were more restricted to interlamellar regions in seawater-acclimated and marine stingray gills. Pendrin immunolabeling in freshwater stingray gills was more apical, discrete, and intense compared with seawater-acclimated and marine stingrays. Regardless of salinity, pendrin immunoreactivity occurred on the apical region of cells rich with basolateral vacuolar-proton-ATPase, and not in Na+-K+-ATPase-rich cells. We suggest that a pendrin-like transporter may contribute to apical Cl−/HCO[Formula: see text] exchange in gills of Atlantic stingrays from both freshwater and marine environments.

Identification of a Glycosylated Relaxin-like Molecule from the Male Atlantic Stingray,Dasyatis sabina†

Biochemistry ◽  
1997 ◽  
Vol 36 (35) ◽  
pp. 10735-10741 ◽  
Author(s):  
Erika E. Büllesbach ◽  
Christian Schwabe ◽  
Eric R. Lacy
Keyword(s):  
Dasyatis Sabina ◽  
Atlantic Stingray

Spine Replacement in a Freshwater Population of the Atlantic Stingray, Dasyatis sabina

Copeia ◽  
1997 ◽  
Vol 1997 (1) ◽  
pp. 220 ◽  
Author(s):  
Elena Amesbury ◽  
Franklin F. Snelson
Keyword(s):  
Dasyatis Sabina ◽  
Atlantic Stingray ◽  
Freshwater Population

Tidal and diel movement patterns of the Atlantic stingray (Dasyatis sabina) along a stream-order gradient

2017 ◽  
Vol 68 (9) ◽  
pp. 1716 ◽  
Author(s):  
Cameron Patrick Brinton ◽  
Mary Carla Curran
Keyword(s):  
Ecosystem Engineer ◽  
Warm Season ◽  
Movement Patterns ◽  
Cold Season ◽  
Time Of Day ◽  
Stream Order ◽  
Foraging Patterns ◽  
Dasyatis Sabina ◽  
Diel Cycles ◽  
Atlantic Stingray

The behaviour of the Atlantic stingray (Dasyatis sabina) is affected by environmental cues, including time of day and tide. The purpose of the present study was to determine whether these cycles and differences in creek geomorphology affected presence and movement patterns of Atlantic stingrays near Savannah, GA, USA. Forty-five stingrays were tagged with Vemco coded-acoustic transmitters and passively tracked in two creek systems between December 2012 and December 2014. The geomorphology of the creeks was classified using the Horton stream-order concept, with the smallest tributaries assigned to the first order. Stingrays moved most at dusk (0.26±0.09 movements day–1), followed by night (0.23±0.09 movements day–1). Stingrays were found in deeper water during the cold season than during the warm season. Patterns in creek usage across tidal stages were nearly consistent across seasons. However, the diel pattern varied; stingrays utilised all creek orders throughout the diel cycle in the warm seasons, but entered only shallow creeks during the day in the cold season. Because presence and movements of stingrays were affected by tidal and diel cycles, these environmental factors could also affect their foraging patterns and their influence as an ecosystem engineer.

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