Do competing honey bees matter? Dynamics and abundance of native bees before and after honey bee invasion
Do competing honey bees matter? Dynamics and abundance of native bees before and after honey bee invasion
复制标题
竞争的蜜蜂重要吗？
作者：
D. Roubik;H. Wolda
摘要为了提供自然保护区内当地蜜蜂种群的重复样本，在巴拿马的巴罗科罗拉多岛（BCI）上连续进行了17年的灯光诱捕，其中包括非洲蜜蜂入侵后的10年。蜜蜂出现在灯光陷阱作为第一群殖民巴拿马运河地区。它们的数量遵循独立研究中显示的季节性趋势，从而表明蜜蜂在大面积上的丰度和活动。没有可测量的人口水平的影响，这种入侵的蜜蜂和本地蜜蜂之间的竞争，尽管许多示威的资源竞争，在花补丁和殖民地的水平，改变了所有15个本地蜜蜂物种的年丰度。本地蜜蜂丰度没有减少，也没有本地蜜蜂显示出实质性的相互每年的变化与蜜蜂丰度。蜜蜂捕获量与多雨年份呈显著负相关，但以降雨量和蜜蜂数量为自变量的多元回归分析表明，两者都不是17年来蜜蜂数量变化的原因。在蜜蜂数量达到高峰的一年中，近一半的本地物种数量下降。蜜蜂在一个岛屿上的BCI的大小的竞争必然会降低到低于预期的影响水平在大陆上进行了讨论，使用一个模型的资源和消费者的密度，觅食范围，和岛屿的大小。
Abstract To provide replicate samples of local bee populations in a nature preserve, light traps operated continuously on Barro Colorado Island (BCI), Panama, collected bees for 17 years, including 10 years following invasion by African Apis mellifera. Honey bees appeared in light traps as the first swarms colonized the Panama Canal area. Their numbers followed seasonal trends shown in inde-pendent studies, thus indicating bee abundance and activity in a large area. No measurable population-level impact of competition between this invading honey bee and native bees, despite many demonstrations of resource competition at flower patch and colony levels, changed annual abundances of all 15 native bee species. Native bee abundance did not decrease, nor did native bees show substantial reciprocal yearly change with honey bee abundance. One strong negative correlation of bee catches with an extremely rainy year was found. However, multiple regression using rainfall and honey bee abundance as the independent variables showed that neither was responsible for bee population change over 17 years. Nearly half the native species declined during a year that displayed peak honey bee number. That competition from honey bees on an island the size of BCI was necessarily reduced below impact levels expected on the mainland is discussed using a model of resource and consumer density, foraging range, and island size.