Table 6.5 Permeabilit y of amphibian sk in to w at er (osm otic gradi ent 200 to 220
m-osmole t l} in the absence and presence of v asotocin
13
61
Amph ibious
3
5
Aquatic
5
19"': '
Amphibious
9
27':'
Amphibious
8
9
Aquatic
7
7':'
8
8
Fresh w at er
or marine
4
7
Terrestrial
2
5
Aquatic
11
7
Terrestrial
4
4
Aquatic
4
5
Aquatic
3
4
7
8
Terrestrial
Anura
Bufo marinus(American toad)
Bufo buf0 2
(European toad)
Rana catesbeianal , a
(Bullfrog)
(i) Adult
(ii) Tadpole
Rana pipiens'
(Leopard frog)
Rana esculenta "
(European frog)
Xenopus laeui s-. 2
(African clawed toad)
Rana cancriuoras
(Crab-eating frog)
Urodela
Amby stoma tigrinum 6
(Ti ger salamander)
lar va
Salam andra maculosal
(Fi re sa lama nde r)
Amphiuma means'
(Congo eel)
Siren lacertina'
(M ud eel)
N ectu rus maculosus"
(M ud pup py )
Triturus alpestris':
(Alpine newt)
N ormal
28
19
Vasotocin present
85
44':'
Hab itat
Terrestrial
Terrestrial
': . oxytocin
,:.,: . Pituitrin
'B ENTLEY (1969 b); 2MAETZ (1963); 3BENTLEY and GREENWALD (1970); 4SAWYER (1951);
"D ICKER and ELLIOTT (1969 ,1970); 6BENTLEY and H ELLER (1964); 7BENTLEY and HELLER (1965) .
North Carolina, should be able to absorb water from the soil in the agricultural
areas of th is region at any time of the y ear. If perchance the y burrowed into soil
with a low moisture content, the expected losses would be still far less than would
usually take place by evaporation at the surface.
When amphibians are deh ydrated the y usually absorb water through their skin
170