The researchers bred rotifers in three different environments: one in which the quality of available food was high, one in which it was low and one in which it was mixed.
The stone-curlew reached a low of around 160 breeding pairs in the 1980s, but this year 370 pairs are known to have bred.
1980年代，石鸻科的鸟只有160对左右，但据悉今年将有370对在此繁殖。
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Sulfur content low, stable and reliable, effective conservation of sulfur ball and bred in the course of the adverse effects of the alloy, alloy cost savings.