Torretta Juan Pablo, Basilio Alicia M
Cátedra de Botánica Agrícola, Facultad de Agronomía, Universidad de Buenos Aires, Buenos Aires, Argentina.
Rev Biol Trop. 2009 Mar-Jun;57(1-2):283-92.
The "talares" in eastern Buenos Aires province, Argentina, are coastal xerophitic forests structured by few arboreal species surrounded by a lower and moister soil matrix. We studied the reproductive parameters of the most representative arboreal species (Celtis tala, Scutia buxifolia, Jodina rhombifolia, and Schinus longifolia). Pollen dispersion was studied through floral visitor traps (biotic dispersion) and using gravimetric pollen collectors (abiotic dispersion). The reproductive success (fruit formation rate) of the focal species was studied by enclosing flowers with different mesh bags. The reproductive system varied among the different species. C. tala was anemophilous and selfcompatible. S. buxifolia was entomophilous and floral visitors dependant. J. rhombifolia was entomophylous, although spontaneous autogamy could favor reproduction in the absence of pollinators. Lastly, S. longifolia could be an ambophilous species (pollinated by insects and by the wind). This dual system may be the result of system flexibility mechanism or an evolutionary transition.
阿根廷布宜诺斯艾利斯省东部的“塔拉雷斯”是一种沿海旱生林，由少数乔木物种构成，周围是较低且湿润的土壤基质。我们研究了最具代表性的乔木物种（朴树、布氏鼠李、菱形乔迪纳木和长叶胡椒）的繁殖参数。通过花卉访客陷阱（生物传播）和使用重量花粉收集器（非生物传播）来研究花粉传播。通过用不同网袋包裹花朵来研究重点物种的繁殖成功率（果实形成率）。不同物种的繁殖系统各不相同。朴树是风媒传粉且自交亲和的。布氏鼠李是虫媒传粉且依赖花卉访客的。菱形乔迪纳木是虫媒传粉的，不过在没有传粉者的情况下，自发自花授粉可能有利于繁殖。最后，长叶胡椒可能是兼性传粉物种（由昆虫和风传粉）。这种双重系统可能是系统灵活性机制或进化过渡的结果。
