RATL: A Database of Reptile and Amphibian Toxicology Literature

Table 6 - pH Studies - 18
Species
Code b
Lifestage Study
Endpoint g
pH Level(s)
Temp h Additional
Contam a
Cont.
Conc.
Conc.
e
Units
e
LC50 LC100 e
Effects eg
Reference k
MIOR embryos MORT 3.0-11.0 Late gastrula stage embryos tolerated pH 4.0
- 10.5 showing normal development and
hatching; pH 3.0 development immediately
arrested and embryos were killed within a few
hours; pH 3.2 - 3.6 gradual decrease in
toxicity; pH 3.8 20 % mortality.
Padhye and Ghate 1988
MIOR tadpoles MORT 3.0-11.0 No significant difference in tolerance of
tadpoles to altered pH as compared to that
of the embryos, however hind-limb stage
tadpoles appeared to be slightly resistant to
acidic pH and more sensitive to alkaline pH.
Padhye and Ghate 1988
NEMA adult PHYSIO The mechanosensitivity was suppressed by
Mg, Co and La as well as low pH. Possibly
due to competition with calcium.
Sand 1975
NERH adult PHYSIO 7.0 pyruvate 0.03-0.50
Greater LDH activity than turtle PSSC, Km Baeyens and Hurley 1986
mM
values lower and Vmax higher than in turtle
suggesting after conversion of pyruvate to
lactate when the enzyme is saturated with
substrate.
NOVI adult MORT 3.5-5.0 5, 21 100 % survival at pH 3.8 - 5.0 at 5 and
21°C. 10 - 30 % survival at pH 3.5 after 38
d at 5°C; 50 - 87 % survival after 14 d at
21°C.
Dale et al. 1985 k
NOVI adult POPSUR Appeared to be distributed uniformly across
pH spectrum, but with low numbers on soils
of lowest pH.
Wyman and Jancola 1992
NOVI adult POPSUR pH range= 4.53-6.97. Doka et al. 1997
NOVI adult PHYSIO 4.22-4.32 Rate of Na loss after acute exposure to low
pH (4.24- 4.32) increased significantly;
chronic exposure to low pH followed by a
transfer to pH 4.22 - 4.37 reduced the rate
of Na loss to less than that observed in
control animals.
Robinson 1993
NOVI adult BEHAV 4.2-6.0 Reproduction of NOVI significantly lower in
lower pH; adults often trapped more in pH
4.2 than in > 6.0; release of NOVI resulted in
significantly lower survival of RASY at
metamorphosis, survival not affected by pH
4.2.
Sadinski and Dunson 1992
NOVI tadpoles POPSUR Results not extracted from paper. Mallory et al. 1996
NOVV adult PHYSIO 3.0-6.0 Animals exposed to low pH in the laboratory Frisbie and Wyman 1991
did not exhibit elevated Na efflux rate
constants as in PLCI, EUBI and DEOC.