Cummins C P
Natural Environment Research Council, Monks Wood Experimental Station, Abbots Ripton, PE17 2LS, Huntingdon, Cambs, UK.
Oecologia. 1986 May;69(2):248-252. doi: 10.1007/BF00377630.
Rana temporaria tadpoles were raised to metamorphosis at 6 levels of pH (pH 3.6-6.5) and 2 levels of aluminium (800 and 1,600 μg l) at pH 4.4. Treatments involved both chronic and acute exposure to depressed pH. Decreasing pH reduced maximum body size and delayed metamorphosis. Growth was depressed and metamorphosis delayed by 800 μg l Al, and several tadpoles died at foreleg emergence. At 1,600 μg l Al, small tadpoles suffered arrested growth and development and eventually died, while larger tadpoles metamorphosed without delay, though at a very small size. There was no mortality among controls. The levels of pH and inorganic monomeric aluminium measured in the experiments were similar to field levels at a site in Scotland, and it is concluded that individual tadpoles will, in certain types of water body, be adversely affected by both acidity and aluminium. The impact of these factors on populations remains to be determined.
将林蛙蝌蚪在6种pH值水平（pH 3.6 - 6.5）和pH值为4.4时的2种铝含量水平（800和1600微克/升）下饲养至变态期。实验处理包括长期和短期暴露于低pH值环境。pH值降低会减小最大体型并延迟变态。800微克/升的铝会抑制生长并延迟变态，几只蝌蚪在前肢出现时死亡。在1600微克/升的铝含量下，小蝌蚪生长发育停滞并最终死亡，而较大的蝌蚪虽能按时变态，但体型极小。对照组无死亡情况。实验中测得的pH值和无机单体铝水平与苏格兰某一地点的野外水平相似，研究得出结论，在某些类型的水体中，单个蝌蚪会受到酸度和铝的不利影响。这些因素对种群的影响仍有待确定。
