1239061990

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AID: 1239061990
Английский
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APRm
Pollination Biology of Two Chiropterophilous Agaves in Arizona
American Journal of Botany, . V. 87. No. 6. P. 825836 (12).
I studied the pollination biology of two closely related species of agave, Agave palmeri and A. chrysantha (Agavaceae), which exhibit several chiropterophilous (bat-pollinated) traits. Floral studies, floral visitor observations, and pollination studies were conducted over four summers at six different sites to examine floral traits and determine the relative importance of diurnal vs. nocturnal pollinators. Agave chrysantha appears to have developed minor shifts in several floral characters that enhance diurnal pollination. Although floral shifts towards diurnal pollination were fewer in A. palmeri, stigmas were diurnally receptive and copious floral rewards were available in the morning, indicating that some adaptations exist to allow for multiple pollinators. Differences in fruit and seed set between naturally day- and night-pollinated umbels for both species were either not significant or significantly higher in day-pollinated plants. Bats were not important pollinators of A. chrysantha, and the mutualistic relationship between A. palmeri and the lesser long-nosed bat was found to be asymmetric. "Bat-adapted" floral traits appear to be flexible enough to respond to the climatic and pollinator unpredictability experienced by agaves at the northern edge of their distribution. This variability may be a more important factor affecting evolution of floral characters than a particular pollinator.
Ключевые словаCentury plant, Fruit set, Lesser long-nosed, Bat pollination, Seed set
Регионы исследованияArizona
Таксоны растенийAgave, Agave chrysantha, Agave palmeri
Таксоны животныхLeptonycteris curasoae, Leptonycteris
В подборкахОсновная литература

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