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Phenology and reproductive ecology of Myrcia rostrata and M. tomentosa (Myrtaceae) in central Brazil
TOREZAN-SILINGARDI Helena Maura ; DE OLIVEIRA Paulo Eugenio Alves Macedo
We studied the reproductive ecology of two species from one of the largest Neotropical genera in Myrtaceae, Myrcia rostrata DC. and M. tomentosa (AUBL.) DC., which are commonly found in South American forests and cerrado.Their small hermaphrodite flowers are bee-pollinated, as usual for the species of Myrtaceae, and pollen is the sole reward offered to small social bees (Trigona, Apis, Augochloropsis). In both species the flowering period begins after the first spring rains, a common pattern in Myrtaceae. M. rostrata has a "multiple bang" flowering strategy while M. tomentosa has a "pulsed bang" one, which differ in duration and synchronization between individuals, with a blooming period of only three days in the latter species. Pollination experiments indicated these species are preferentially outcrossing, as many Myrtaceae studied, setting more fruits from cross than self-pollination. High natural fruit-sets observed for both species suggests adequate pollination at Panga Ecological Reserve. However, the reduced pre-emergent reproductive success values observed for M. tomentosa, due to larval herbivory inside floral buds, may limit its reproductive output.
ISSN : 0079-2047
Phyton (Horn) A. 2004, vol. 44, n° 1, pp. 23-43 [21 pages]
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