Prey Discrimination and Electroreception in the Stingray Dasyatis sabina

Copeia ◽  
1988 ◽  
Vol 1988 (1) ◽  
pp. 33 ◽  
Author(s):  
Barbara I. Blonder ◽  
William S. Alevizon
Keyword(s):  
Dasyatis Sabina ◽  
Prey Discrimination

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

Acoustic basis for fish prey discrimination by echolocating dolphins and porpoises

2009 ◽  
Vol 126 (1) ◽  
pp. 460-467 ◽  
Author(s):  
Whitlow W. L. Au ◽  
Brian K. Branstetter ◽  
Kelly J. Benoit-Bird ◽  
Ronald A. Kastelein
Keyword(s):  
Fish Prey ◽  
Prey Discrimination

scholarly journals Pathogen avoidance and prey discrimination in ants

2020 ◽  
Vol 7 (2) ◽  
pp. 191705 ◽  
Author(s):  
Hugo Pereira ◽  
Claire Detrain
Keyword(s):  
Fungal Infection ◽  
Foraging Behaviour ◽  
Chemical Cues ◽  
Myrmica Rubra ◽  
Physico Chemical ◽  
Insect Societies ◽  
Binary Choices ◽  
Prey Discrimination ◽  
Pathogen Avoidance ◽  
Infected Prey

Insect societies have developed sanitary strategies, one of which is the avoidance of infectious food resources as a primary line of defence. Using binary choices, we investigated whether Myrmica rubra ants can identify prey that has been artificially infected with the entomopathogenic fungus, Metarhizium brunneum . We compared the ants' foraging behaviour towards infected prey at three different stages of fungus development : (i) prey covered with fungal conidia, (ii) prey freshly killed by the fungus and (iii) sporulating prey. Most foragers retrieved a corpse covered with a high number of spores but they consistently avoided a sporulating prey and collected less prey that had recently died from fungal infection. Furthermore, ant responses were highly variable, with some individuals retrieving the first prey they encountered while others inspected both available prey before making a decision. Workers were not repelled by the simple presence of fungal conidia but nevertheless, they avoided retrieving cadavers at later stages of fungal infection. We discuss how these different avoidance responses could be related to: differences in the ants’ perceptive abilities; physico-chemical cues characterizing fungus-infected prey or in the existence of physiological or behavioural defences that limit sanitary risks associated with potentially contaminated resources.

Prey discrimination by a generalist coccinellid predator: effect of prey age or parasitism?

2001 ◽  
Vol 26 (2) ◽  
pp. 163-172 ◽  
Author(s):  
Caroline Roger ◽  
Daniel Coderre ◽  
Clément Vigneault ◽  
Guy Boivin
Keyword(s):  
Prey Discrimination

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
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