南米産淡水エイ Potamotrygon magdalenae の腎構造について

概要

論文の詳細を見る
The nephron structure of a freshwater stingray, Potamotrygon magdalenae was studied by light microscope and compared with those of marine stingrays, Dasyatis akajei and Holorhinus tobijei. No difference in nephron structure was observed within these three stingrays. The nephron in P. magdalenae is composed of a long neck segment, a proximal convoluted segment with two different diameters, a relatively long distal convoluted segment and a collecting tubule. Contact between the distal convoluted segment and the vascular pole of the glomerulus was found in elasmobranchs used in this study. However, no special stucture comparable to a macula densa in mammals was observed. It was reconfirmed that the plasma of P. magdalenae contained no urea. There, the osmotic pressure of the plasma of P. magdalenae was one third that of plasmobranch, the banded dogfish, Triakis scylia. These findings are discussed in relation to the possible role ofrenal function in osmoregulation in freshwater stingrays.
社団法人日本動物学会の論文
1982-03-25