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The Cactus Stenocereus griseus (Haworth), 1812 : an interesting case from the point of view of seed dispersion syndromes
Autores:
En: CARIBBEAN JOURNAL OF SCIENCE, vol. 40, núm. 1; Apr. 2004: p 17-22. bibl. tabla.
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Revista: Caribbean journal of science, vol. 40, núm. 1; Apr. 2004
Resumen: Stenocereus griseus is a columnar cactus occurring in the Caribbean Basin. The species is interesting from the point of view of seed dispersion syndromes because its pulp may exhibit two colors within the same population: blood red and greenish white, corresponding to ornithochory (seed dispersion by birds) and chiropterochory syndromes (seed dispersion by bats) respectively. In both fruit types, the content of water, glucose, fructose, sucrose, non-structural carbohydrates, proteins, and lipids was quantified and compared to adaptations of seed dispersers. No statistical differences were found between red and white fruits for the studied characteristics. Fruit pulp of S. griseus can be considered as extremely “energy-diluted,” with the content of hexoses exceeding that of sucrose, accordingly to ornithochory syndrome. Our results and the available ecological data on fruit consumption in S. griseus do not support the general notion that selection by fruit-eating animals has lead to the evolution of the classical fruit syndromes. We hypothesize that these fruits are like a “sport beverage” especially for animals with an elevated metabolism-rate on extreme habitats, e. g. xeric.
Palabras Claves: Palabras claves: Stenocereus griseus, pulp compositions, seed dispersion syndromes, pulpa, composición, síndrome de dispersión de semillas, cactaceas
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The Cactus Stenocereus griseus (Haworth), 1812 : an interesting case from the point of view of seed dispersion syndromes

Stenocereus griseus is a columnar cactus occurring in the Caribbean Basin. The species is interesting from the point of view of seed dispersion syndromes because its pulp may exhibit two colors within the same population: blood red and greenish white, corresponding to ornithochory (seed dispersion by birds) and chiropterochory syndromes (seed dispersion by bats) respectively. In both fruit types, the content of water, glucose, fructose, sucrose, non-structural carbohydrates, proteins, and lipids was quantified and compared to adaptations of seed dispersers. No statistical differences were found between red and white fruits for the studied characteristics. Fruit pulp of S. griseus can be considered as extremely “energy-diluted,” with the content of hexoses exceeding that of sucrose, accordingly to ornithochory syndrome. Our results and the available ecological data on fruit consumption in S. griseus do not support the general notion that selection by fruit-eating animals has lead to the evolution of the classical fruit syndromes. We hypothesize that these fruits are like a “sport beverage” especially for animals with an elevated metabolism-rate on extreme habitats, e. g. xeric.
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