If so , farms and agroforests have lost birds that provide important insect-control , pollination and seed-dispersal services .
如果是，农场和混农林就失去大量提供重要的害虫控制、授粉和播种服务的鸟类。
Now so-called " colony collapse disorder " or ccd continues to kill bees -- who provide some $ 15 billion worth of economic good via pollination and other efforts .
As the production of almonds has grown , the prices that the beekeepers can charge for their pollination services have increased .
随着杏仁产量的增加，养蜂人提供授粉服务收取的费用也水涨船高。
Meanwhile , the recent high prices for pollination contracts made it look worthwhile fattening bees up with supplements over the winter . That may help explain why there have been fewer colony collapses .
Corn came within pennies of $ 7 a bushel for the first time since september as the heat places stress on stalks during their fragile pollination phase .
