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RATL: A Database of Reptile and Amphibian Toxicology Literature

RATL: A Database of Reptile and Amphibian Toxicology Literature

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Table 6 - pH Studies - 37<br />

Species<br />

Code b<br />

Lifestage Study<br />

Endpoint g<br />

pH Level(s)<br />

Temp h Additional<br />

Contam a<br />

Cont.<br />

Conc.<br />

Conc.<br />

e<br />

Units<br />

e<br />

LC50 LC100 e<br />

Effects eg<br />

Reference k<br />

TRHE embryo DEVOBS 4.45 <strong>and</strong> 7.4 21±1 Embryos raised in acidified artificial s<strong>of</strong>t<br />

water hatched at a smaller size, an earlier<br />

stage (38 vs. 39) <strong>of</strong> development <strong>and</strong> on<br />

average 1-2 d before those raised under<br />

neutral conditions. Survival to hatching was<br />

reduced under low pH in both species.<br />

Griffiths et al. 1993<br />

TRHE larvae DEVOBS 4.45 <strong>and</strong> 7.4 17-24 At 4 wks <strong>of</strong> growth all larvae had reached<br />

stages 52-54. Larvae grew to a larger size<br />

under neutral artificial s<strong>of</strong>t water than under<br />

acid conditions. TRHE were smaller than<br />

TRVU (no significant difference). 95%<br />

TRHE survived under neutral <strong>and</strong> acid<br />

conditions.<br />

Griffiths et al. 1993<br />

TRHE larvae BEHAV 4.5 <strong>and</strong> 7.4-7.5 20±3 TRHE <strong>and</strong> TRVU both showed a decline in<br />

the response to prey after transfer to pH<br />

4.5. For TRHE this was only significant at<br />

22 h after transfer back to the same<br />

conditions. Larvae were more sluggish at the<br />

lower pH <strong>and</strong> tended to orient towards food.<br />

Griffiths et al. 1993<br />

TRHE not<br />

specified<br />

POPSUR 4.0-8.0 Survey <strong>of</strong> amphibian breeding sites.<br />

Beebee 1983 k<br />

TRVU adult POPSUR 4.0-5.0 18.9 % <strong>of</strong> water at pH 5.0 contained TRVU;<br />

no TRVU in water at pH 4.0.<br />

Leuven et al. 1986 k<br />

TRVU adult POPSUR Population increased in acidified lakes.<br />

Hagstrom 1981 k<br />

TRVU adult BEHAV Predation pressure on eggs <strong>of</strong> RAAR was low Henrikson 1990<br />

due to thick jelly. The eggs <strong>of</strong> BUBU were<br />

not attractive to predators with chewing<br />

mouths parts due to unpalatability but<br />

predators with sucking mouth parts were not<br />

repulsed.<br />

TRVU adult POPSUR 4.0-6.0 Rarely encountered in water with pH > 6.0.<br />

Breeding site characteristics studied.<br />

Cooke <strong>and</strong> Frazer 1976 k<br />

TRVU embryo DEVOBS 4.45 <strong>and</strong> 7.4 21±1 Embryos raised in acidified artificial s<strong>of</strong>t<br />

water hatched at a smaller size, an earlier<br />

stage (38 vs. 39) <strong>of</strong> development <strong>and</strong> on<br />

average 1-2 d before those raised under<br />

neutral conditions. Survival to hatching was<br />

reduced under low pH in both species.<br />

Griffiths et al. 1993

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