INTRASPECIFIC RESOURCE PARTITIONING IN THE BUMBLE BEES BOMBUS-TERNARIUS AND BOMBUS-PENNSYLVANICUS
INTRASPECIFIC RESOURCE PARTITIONING IN THE BUMBLE BEES BOMBUS-TERNARIUS AND BOMBUS-PENNSYLVANICUS
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DOI：
10.2307/1938511
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发表时间：
1986-02-01
期刊：
影响因子：
4.8
通讯作者：
JOHNSON, RA
中科院分区：
文献类型：
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作者：
JOHNSON, RA
我测试了工蜂（熊蜂和B）种内大小差异和资源利用差异之间的关联。pennaculicus）。蜜蜂在明尼苏达州的两个老领域中观察到觅食[美国]，在那里的花卉品种与短花冠和物种与长花冠发生在单一物种和混合物种的立场。在混合种的立场，觅食的物种与短花冠被发现有较短的喙比同种觅食的物种与长花冠。然而，喙的长度觅食的物种与长的花冠在单种的立场没有不同的物种与短的花冠在单种的立场。因此，在有选择的情况下，熊蜂觅食者会选择花冠与其喙长最匹配的物种。然后，我比较了单物种林与混合物种林中单一花卉物种的同种觅食者。对于觅食的开花物种短花冠，喙长度显着短的混合物种比在单一物种的立场，但没有发现这种差异的物种长花冠。因此，其他开花物种的存在可以影响一个物种的传粉者种群，相对于一个单一的物种stand.Resource选择觅食进行了分析，使用概率函数，计算为觅食的比例与给定的喙长度的物种与长花冠的数量与喙长度收集两个物种。使用概率单位分析将概率函数的形状拟合为S形曲线。线性化概率的回归具有显著性。这个过程是一个更好的措施内或物种间的关联比措施，如生态位重叠，因为它量化了一个连续的分布和帐户的变化，在物种分布。
I tested for an association between intraspecific size differences and differences in resource utilization in worker bumble bees (Bombus ternarius and B. pennsylvanicus). Bees were observed foraging in two old fields in Minnesota [USA] where flower species with short corollas and species with long corolias occurred in both single-species and mixed-species stands. In mixed-species stands, foragers on the species with short corollas were found to have shorter proboscides than conspecific foragers on the species with long corollas. However, proboscis lengths of foragers on the species with a long corolla in single-species stands did not differ from those on the species with a short corolla in single-species stands. Thus, where a choice exists, bumble bee foragers select the species having a corolla most compatible to their proboscis length. I then compared conspecific foragers on a single flower species in one-species versus mixed-species stands. For foragers on flowering species with a short corolla, proboscis length was significantly shorter in the mixed-species than in the single-species stand, but this difference was not found for the species with a long corolla. Thus, presence of other flowering species can influence the pollinator population of a species, relative to a single-species stand. Resource choice by foragers was analyzed using a probability function, calculated as the ratio of foragers with a given proboscis length on the species with a long corolla to the number with that proboscis length collected on both species. The shape of the probability function was fitted to a sigmoidal curve using probit analysis. Regression of the linearized probabilities was significant. This procedure is a better measure of intra- or interspecies association than are measures such as niche overlap, because it quantifies a continuous distribution and accounts for variance in the species distribution.