Main Title |
Influence of External Cation Concentration on the Hatching of Amphibian Embryos in Water of Low pH. |
Author |
Freda, J. ;
Dunson, W. A. ;
|
CORP Author |
Pennsylvania State Univ., University Park. Dept. of Biology.;Corvallis Environmental Research Lab., OR. |
Year Published |
1985 |
Report Number |
EPA/600/J-85/490; |
Stock Number |
PB87-198800 |
Additional Subjects |
Acidity ;
Reproduction(Biology) ;
Embryos ;
Amphibia ;
Ponds ;
Toxicity ;
Exposure ;
Mortality ;
pH ;
Concentration(Composition) ;
Calcium ;
Magnesium ;
Sodium ;
Ions ;
Sensitivity ;
Comparison ;
Survival ;
Defects ;
Reprints ;
Ambystoma ;
Rana
|
Holdings |
Library |
Call Number |
Additional Info |
Location |
Last Modified |
Checkout Status |
NTIS |
PB87-198800 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
Collation |
10p |
Abstract |
Amphibian embryos exposed to water of low pH were killed by two distinct mechanisms. At very low pH levels, embryos stopped development soon after exposure to test solutions. At higher but still lethal pH levels, embryos became curled within a shrunken perivitelline space and failed to hatch (curling defect). The addition of Ca, Mg, and to a lesser extent Na (greater than 10 mg/l), prevented the early mortality of embryos in acidic water. However, increasing concentrations of these ions also caused the curling defect. Embryos of Ambystoma maculatum and Ambystoma jeffersonianum were generally able to hatch even though they became curled, but Rana sylvatica remained trapped and died. Consequently, as the concentration of Ca, Mg, or Na was increased at low pH, greater numbers of embryos of A. maculatum and A. jeffersonianum hatched, while survival of embryos of R. sylvatica was drastically reduced. |
Supplementary Notes |
Summary in French. Pub. in Can. Jnl. Zool., v63 p2649-2656 1985. Sponsored by Corvallis Environmental Research Lab., OR. |
NTIS Title Notes |
Journal article. |
Title Annotations |
Reprint: Influence of External Cation Concentration on the Hatching of Amphibian Embryos in Water of Low pH. |
PUB Date Free Form |
c1985 |
Category Codes |
68D; 57Z; 57Y |
NTIS Prices |
PC A02/MF A01 |
Primary Description |
600/02 |
Document Type |
NT |
Cataloging Source |
NTIS/MT |
Control Number |
723226906 |
Origin |
NTIS |
Type |
CAT |