RATL: A Database of Reptile and Amphibian Toxicology Literature

Table 6 - pH Studies - 38
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
TRVU larvae DEVOBS 4.45 and 7.4 17-24 At 4 wks of growth all larvae had reached
stages 52-54. Larvae grew to a larger size
under neutral artificial soft water than under
acid conditions. TRVU were larger than
TRHE (not significant difference).
Griffiths et al. 1993
TRVU larvae BEHAV 4.5 and 7.4-7.5 20±3 TRHE and TRVU both showed a decline in
the response to prey after transfer to pH
4.5. Larvae were more sluggish at the lower
pH and tended to orient towards food but
snap less frequently than under circumneutral
conditions.
Griffiths et al. 1993
TRVU not
specified
POPSUR 4-8 Survey of amphibian breeding sites.
Beebee 1983 k
XEGI embryo MORT 3.6-9.0 (third 21-22 0.3-10 x
LC50 at
Dejellied embryos of XEGI and XELA Picker et al. 1993
bioassay)
normal
pH 4.5 was
showed comparable tolerances to increasing
2x
blackwater conc. No development occurred
blackwater
at pH 3.6. At pH 4.5 and above, survival
increased and was only depressed in solutions
of 2x, 5x and 10x blackwater.
XEGI embryo MORT 3-10 21-22 1 x
Blackwater Blackwater: For the second bioassay the pH at which Picker et al. 1993
normal
: 3.84 3.6 (jellied) survival was first noted differed with type of
(0.026 SE) 4.3 water, jellied embryos were more resistant to
(jellied) (dejellied) low pH stress in both tap and blackwater.
6.73
Dejellied eggs of both species have similar
(0.414 SE)
(dejellied)
tolerance levels.
XEGI embryo MORT 3-10 21-22 Clearwater Clear The pH at which survival was first noted Picker et al. 1993
(1st water: 3.6 differed with type of water, jellied embryos
bioassay): (jellied) 3.6 were more resistant to low pH stress in both
3.81 (dejellied) tap (clearwater) and blackwater. Dejellied
(0.063 SE)
eggs of both species have similar tolerance
(jellied)
4.06
(0.148 SE)
(dejellied)
levels.
XELA adult (skin) PHYSIO Decreased in short circuit current.
Fromm 1981 k
XELA embryo MORT 3.5 3.0 Results not extracted from paper.
XELA embryo HATSUC 3.5 and 3.6 20-24 >90% of eggs remained in the egg stage;
cleavage divisions visible after 3d. No
hatching occurred.
Tome and Pough 1982 k
Dumpert 1986