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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 - 14<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 />

BUCN adult POPSUR Species has disappeared; cause <strong>of</strong> population<br />

decline is not due to acidification <strong>and</strong> is<br />

unknown.<br />

Bradford et al. 1994<br />

BUCN embryo MORT 4.0-6.0 15 Al 0 or mg/L 4.7 The estimated extreme pH for Sierra Nevada Bradford et al. 1992<br />

0.039-<br />

surface waters (5.0) did not cause a<br />

0.080<br />

significant reduction in survival for either<br />

life stage or species. Sublethal effects were<br />

evident as earlier hatching at pH 5.0.<br />

BUCN tadpoles MORT 4.0-6.0 15 Al 0 or mg/L 4.3 The estimated extreme pH for Sierra Nevada Bradford et al. 1992<br />

0.039-<br />

surface waters (5.0) did not cause a<br />

0.080<br />

significant reduction in survival for either<br />

life stage or species. Experimental exposure<br />

to Al did not affect survival; some sublethal<br />

effects reported.<br />

BUVA tadpoles DEVOBS 4.0, 7.2-7.6 25-30 Significant difference in wet wt; controls Pierce <strong>and</strong> Montgomery<br />

exhibited twice the growth rate (86%<br />

suppression in growth rate <strong>of</strong> pH 4.0<br />

exposed tadpoles). Significant differences in<br />

dry wts between controls <strong>and</strong> pH 4.0 exposed<br />

tadpoles. No significant differences were<br />

observed.<br />

1989<br />

BUWO adult POPSUR 4.25 Not observed in ponds with pH > 4.25.<br />

Freda <strong>and</strong> Dunson 1986 k<br />

BUWO embryo HATSUC 3.75-5.8 45 % hatching at pH 4.10; 0 % hatching at<br />

pH 3.75 - 4.0; 100 % hatching at pH 4.25<br />

<strong>and</strong> 5.8 in s<strong>of</strong>tened water.<br />

Freda <strong>and</strong> Dunson 1986 k<br />

BUWO tadpoles DEVOBS 4.0-6.0 25-30 Significant difference in wet wt; controls Pierce <strong>and</strong> Montgomery<br />

exhibited twice the growth rate No<br />

significant differences were observed 7 d<br />

after exposure period.<br />

1989<br />

BUXX embryo MORT 3.6-4.0 14.4-19 83.3 % mortality.<br />

Saber <strong>and</strong> Dunson 1978 k<br />

CACA embryo MORT 3.5-6.5 At higher acidity developmental<br />

abnormalities, delayed development <strong>and</strong><br />

mortality was observed. Frequent<br />

abnormalities included microcephaly, edema,<br />

spinal deformities, curling effect <strong>and</strong><br />

integument injury. Levels <strong>of</strong> pH lower than<br />

Hermosilla <strong>and</strong> Pincheira<br />

1992<br />

DEFA adult BEHAV 5.5, 7.7<br />

4.0 were lethal.<br />

Substrate selection: 56.8 % selected pH 7.7. Mushinsky <strong>and</strong> Brodie 1975<br />

k<br />

DEFU adult PHYSIO 3.0-6.0 Animals exposed to low pH exhibited<br />

elevated Na efflux rate constants.<br />

Frisbie <strong>and</strong> Wyman 1991

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