NECTAR PRODUCTION OF EPILOBIUM-ANGUSTIFOLIUM L AT DIFFERENT AIR HUMIDITIES - NECTAR SUGAR IN INDIVIDUAL FLOWERS AND THE OPTIMAL FORAGING THEORY
NECTAR PRODUCTION OF EPILOBIUM-ANGUSTIFOLIUM L AT DIFFERENT AIR HUMIDITIES - NECTAR SUGAR IN INDIVIDUAL FLOWERS AND THE OPTIMAL FORAGING THEORY
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DOI：
10.1007/bf00388069
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发表时间：
1983-01-01
期刊：
影响因子：
2.7
通讯作者：
BERTSCH, A
中科院分区：
文献类型：
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作者：
BERTSCH, A
E.狭叶草属在20 ℃下进行了研究。温度和50、78和94%的环境湿度。通过永久移液管，新鲜生产的花蜜被吸后立即分泌，花蜜样品也采取了10小时和48小时的时间间隔，以调查环境湿度的分泌后的影响。测量来自单个花的样品的体积和糖浓度，并计算所含的糖。在所研究的所有环境湿度和浸提时间间隔内，产糖速率保持恒定;所有180个样品的平均值为1.55 mg蔗糖当量/24 h。分泌花蜜的糖浓度是线性依赖于环境湿度在调查范围内，花蜜体积和糖浓度的变化，根据理论预期的曲线与糖含量为1.55毫克蔗糖的解决方案。研究了蜜腺分泌物对环境湿度阶跃变化的响应，并描述了其瞬态函数。蜜腺对环境湿度的变化会立即做出反应。花蜜生产和花蜜奖励的个人花在外地和最佳觅食的传粉者的结果的后果进行了讨论。讨论特别集中在以下问题：花蜜奖励的变化在个别花可能有花访问熊蜂的影响，这些动物是否有感官能力，以准确地测量糖，以及是否传粉者的水关系也可能影响觅食行为。
The nectar production of E. angustifolium L. was investigated at 20.degree. C and 50, 78 and 94% ambient humidity in the climatic test chamber. By means of permanent pipettes, freshly produced nectar was sucked off immediately after secretion, and nectar samples were also taken at 10-h and 48-h intervals to investigate the post-secretory influence of ambient humidity. Volume and sugar concentration of samples from individual flowers were measured and the sugar contained was calculated. The rate of sugar production remains constant for all ambient humidities and extraction intervals investigated; the mean value for all 180 samples is 1.55 mg sucrose equivalents/24 h. Sugar concentration of secretion nectar is linearly dependent on ambient humidity over the range investigated, and nectar volume and sugar concentration change according to the theoretically expected curve for solutions with a sugar content of 1.55 mg sucrose. The response of secretion nectar to steplike changes in ambient humidity was investigated and the transient function described. The nectaries respond immediately to changes in ambient humidity. The consequences of the results for nectar production and nectar reward of individual flowers in the field and for the optimal foraging of pollinators are discussed. Discussion concentrates particularly on the following questions: what influence the variability of nectar reward in individual flowers may have on flower-visiting bumblebees; whether these animals have the sensory capabilities to measure sugar exactly and whether the water relations of pollinators may also influence foraging behavior.