scholarly journals Electroreception in the euryhaline stingray, Dasyatis sabina

2009 ◽  
Vol 212 (10) ◽  
pp. 1544-1552 ◽  
Author(s):  
D. W. McGowan ◽  
S. M. Kajiura
Keyword(s):  
Dasyatis Sabina

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.

Intracellular recording from pectoral fin motoneurons of the stingray Dasyatis sabina, an elasmobranch fish

1984 ◽  
Vol 51 (4) ◽  
pp. 666-679 ◽  
Author(s):  
B. J. Williams ◽  
M. H. Droge ◽  
R. B. Leonard
Keyword(s):  
Action Potential ◽  
Conduction Velocity ◽  
Initial Segment ◽  
Recurrent Events ◽  
Membrane Conductance ◽  
Membrane Resistance ◽  
Pectoral Fin ◽  
Dasyatis Sabina ◽  
Axonal Conduction ◽  
Input Conductance

Intracellular recordings were made from antidromically identified pectoral fin motoneurons in unanesthetized, decerebrate stingrays (Dasyatis sabina). These recordings had the three all-or-none components seen in other vertebrate motoneuron recordings. About 25% of the impalements had resting membrane potentials that were greater than -80 mV, which is larger than those of motoneurons from other vertebrate species. A novel depolarizing afterpotential (DAP) is associated with the isolated action potential occurring at the first node of Ranvier of the axon (M-spike). Occlusion experiments exclude recurrent events as the source of this potential. A capacitive source for the DAP is postulated. Using morphological and passive electrical data on motoneurons from previous studies, calculations of the passive decay of the nodal spike indicate that the membrane resistance of the initial segment is low and nearly equal to that of nodal membrane. The soma-dendritic (SD) spike is followed by a prominent, humped delayed depolarization (DD). The DD is temporally associated with the onset of the action potential produced by the initial segment (IS spike). Sources of the long-lasting period of repolarization recorded with the IS spike, which may underlie the DD, are postulated. The afterhyperpolarization (AHP) of stingray motoneurons tends to be shorter and smaller in amplitude than that of other vertebrate motoneurons. A negligible conductance change was often found during the period following an SD spike. No significant correlation was found between AHP duration and axonal conduction velocity. The input conductance of stingray motoneurons ranged between 1.5 X 10(-7) and 13.3 X 10(-7) S. The relationship between input conductance and axonal conduction velocity was determined from 42 motoneurons. These data were fitted by a power function with an exponent of 1.7, indicating that, in terms of membrane conductance properties, large stingray motoneurons are simply scaled-up versions of the small motoneurons.

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.

Sign in / Sign up

Export Citation Format

Share Document