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Corpus Systématique Animale

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Nectar secretion pattern of the dish-shaped flower, Cayratia japonica (Vitaceae), and nectar utilization patterns by insect visitors

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  • Takehiko Kakutani 1
  • Tamiji Inoue 1
  • Makoto Kato 2
  • 1) Laboratory of Entomology, Faculty of Agriculture, Kyoto University, 606, Kyoto, Japan
  • 2) Biological Laboratory, Yoshida College, Kyoto University, 606, Kyoto, Japan

We studied the relationship between the diurnal nectar secretion pattern of flowers ofCayratia japonica and insect visiting patterns to these flowers. Flower morphology ofC. japonica changed greatly for about 12 hours after flower-opening and the maximum duration of nectar secretion was 2 days. The nectar volume peaked at 11?00 and 15?00, and declined at night and at 13?00 regardless of time elapsed after flower-opening. The nectar volume at the two peaks was, on average, 0.25 ?l on bagged inflorescences and 0.1?l on unbagged inflorescences (both, sugar concentration=60%). The flower secreted nectar compensatory when the nectar was removed. This means that insects consume more nectar than the difference of nectar volume between bagged and unbagged flowers. Apis cerana is a primary visitor of this flower, and was the only species for which we confirmed pollen on the body, among many species of flower visiting insects to this flower.Apis cerana visited intensively at the two peaks of nectar secretion. Visits of the other insects were rather constant or intensive only when there was no nectar secretion. Thus flowers ofC. japonica with morphologically unprotected nectaries may increase likelihood that their nectar is used by certain pollinators, by controlling the nectar secretion time in day. In this study the pattern of nectar secretion allowedA. cerana maximum harvest of nectar.

Catégories Science-Metrix
  • 1 - natural sciences
  • 2 - biology
  • 3 - ecology
Catégories INIST
  • 1 - sciences appliquees, technologies et medecines
  • 2 - sciences biologiques et medicales
  • 3 - sciences biologiques fondamentales et appliquees. psychologie
  • 4 - ecologie animale, vegetale et microbienne
Catégories Scopus
  • 1 - Life Sciences ; 2 - Agricultural and Biological Sciences ; 3 - General Agricultural and Biological Sciences
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Researches on Population Ecology

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