A comparison of bumblebees' movements in uniform and aggregated distributions of their forage plant
A comparison of bumblebees' movements in uniform and aggregated distributions of their forage plant
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DOI：
10.1046/j.1365-2311.2000.00230.x
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发表时间：
2000-01-01
影响因子：
2.2
通讯作者：
Cresswell, JE
中科院分区：
文献类型：
--
作者：
Cresswell, JE
1. 研究了大黄蜂在甘蓝型油菜（Brassica napus cv weststar）植株上的活动。在植物阵列中，植物被排列成均匀分散的形态或斑驳分散的形态。通过测量大黄蜂在连续8次访问植物后离开原始植物位置的距离，测量阵列上的进展。运动以米和植物间空间为单位进行分析。在这两个单元中，大黄蜂在斑驳分散的阵列中前进得更慢。植物分散对蜜蜂个体在植物间移动的某些组成部分（如以米为单位的移动长度）有可检测的影响，但对其他部分（如平均转角）没有影响。在某些情况下，聚集对个体移动组成部分的影响可能太小，无法进行统计检测，而只在它们对蜜蜂进步的累积影响中出现。在短时间的植物访问序列中，大黄蜂很少重新访问植物，但是在不规则排列中的访问频率几乎是均匀排列的两倍，并且在高度聚集的植物中觅食可能会导致经济惩罚。本研究中发现的植物分散对传粉者运动的影响不太可能对甘蓝型油菜的花粉转移产生重大影响，因为传粉者进展的差异只有在几次连续的植物间飞行离开潜在的花粉源后才会出现，到那时，该物种的花粉携带程度有限，这意味着来自源植物的受精将非常罕见。
1. Movements by bumblebees Bombus lapidarius were studied in arrays of plants of oil-seed rape Brassica napus cv Westar. In the arrays, plants were arranged into either a uniformly dispersed configuration or a patchily dispersed configuration.2. Progress across an array was measured as the distance bumblebees had moved away from an original plant location after eight subsequent, successive plant visits. Movements were analysed in units of both metres and inter-plant spaces. In both units, bumblebees progressed more slowly across patchily dispersed arrays.3. Plant dispersion had a detectable effect on certain components of bees' individual inter-plant moves (e.g. move length in metres) but not on others (e.g. mean turning angle). In some cases, the effects of aggregation on the components of individual moves were probably too small to detect statistically and only emerged in their cumulative effect on bees' progress.4. Over short sequences of plant visits, bumblebees revisited plants rarely, but the frequency of revisits was almost twice as high in patchy arrays as in uniform arrays, and economic penalties may result from foraging among highly aggregated plants.5. The effects of plant dispersion on pollinator movements detected in this study are unlikely to have a major impact on pollen transfer in B. napus because differences in pollinator progress only emerged after several successive inter-plant flights away from a potential pollen source, by which time the limited extent of pollen carryover in this species means that fertilisations from the source plant would be very rare.