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首页> 外文期刊>Biodiversity and Conservation >Short-term effects of experimental boreal forest logging disturbance on bumble bees, bumble bee-pollinated flowers and the bee-flower match
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Short-term effects of experimental boreal forest logging disturbance on bumble bees, bumble bee-pollinated flowers and the bee-flower match

机译：实验性北方森林伐木干扰对大黄蜂，大黄蜂授粉花和蜂花匹配的短期影响

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This study examines how, over the short term, logging affects the density of bumble bees (Apidae: Bombus), the understory plants commonly visited by bumble bees, and the numerical relationship between bumble bees and flowers. In the summers before and after winter logging, bumble bees and plants were surveyed in 50 deciduous stands (each of 8-10 ha) in the boreal forest of northern Alberta, Canada. Logging was replicated at three different intensities: 0, 10-20, and 50-75% of trees remaining. There were generally more bumble bees, species of bumble bee-visited plants, and flowers in moderately (50-75%) logged sites, but this pattern depended on the time of year. Before logging, bumble bees matched resources according to an ideal free distribution (IFD). Logging affected the distribution of bumble bees across floral resources: the slope of the regression relating bumble bee and flower proportions was less than one for clearcut and control treatments (i.e., undermatching), with too many bumble bees in the flower-poor compartments and too few in the flower-rich ones. Deviations from an IFD were negative in control sites, such that fewer bumble bees occurred here than warranted by flower numbers. Controlling for flower density, bumble bee density was significantly greater in clearcuts than in the other treatments. By disproportionately visiting plants in clearcuts (relative to flower density), and by undermatching, bumble bees in clearcuts should experience higher levels of competition. Conversely, the fewer (and undermatching) bumble bees in control sites (relative to flower abundances there) may cause these plants to obtain diminished pollination service. The proximity of clearcut logging to pristine areas may therefore negatively impact plants and bumble bees in the pristine areas, at least in the season immediately following logging.
机译：这项研究探讨了在短期内伐木如何影响大黄蜂的密度（Apidae：Bombus），大黄蜂经常拜访的林下植物以及大黄蜂和花朵之间的数值关系。在冬季伐木前后的夏季，在加拿大艾伯塔省北部的北方森林中的50个落叶林中（每棵8-10公顷）对大黄蜂和植物进行了调查。以三种不同的强度重复伐木：剩余树木的0、10-20和50-75％。通常有较多的大黄蜂，大黄蜂到访的植物种类和中等（50-75％）采伐地点的花朵，但是这种模式取决于一年中的时间。在记录之前，大黄蜂根据理想的自由分布（IFD）匹配资源。伐木影响了大黄蜂在花卉资源上的分布：对于明确和对照处理（即，不匹配），与大黄蜂和花朵比例有关的回归斜率小于1，在花少的隔室中也有太多大黄蜂，花朵丰富的花朵很少。与IFD的偏离在对照部位为负，因此此处发生的大黄蜂数量少于保证的花数。控制花的密度时，与其他处理相比，在明渠中的大黄蜂密度显着更高。通过不分明的方式（相对于花朵密度）过分地拜访植物，以及由于配种不全，明果中的大黄蜂应该经历更高的竞争水平。相反，在控制地点（相对于那里的花丰度）较少（和不匹配）的大黄蜂可能会使这些植物获得的授粉服务减少。因此，至少在伐木刚结束的季节，纯伐木接近原始地区可能会对原始地区的植物和大黄蜂造成负面影响。

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