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1 June 2012 Distyly, Floral Visitors, and Fructification in 2 Natural Populations of Psychotria nervosa (Rubiaceae)
Angélica Maria Hernández-Ramírez
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Abstract

Distyly is a common reproductive strategy in the family Rubiaceae. Studies on tropical species of the genus Psychotria present several cases of atypical distyly, e.g., the absence of reciprocal positioning of sexual organs between morphs, anisoplethy, limited pollen availability, and monomorphy. To describe the floral polymorphism and reproductive ecology of Psychotria nervosa, I studied the proportion of morphs, the floral morphology, the number of inflorescences, flowers, and fruits set between morphs, and the diversity and behaviour of floral visitors in 2 natural populations of the species in a seasonally dry tropical forest in Mexico. Psychotria nervosa is a distylous species; both populations presented a 1:1 morph ratio, with reciprocal positioning of sexual organs between morphs, as well as a suite of ancillary floral traits associated to polymorphism. The diversity and behaviour of the floral visitor assemblage caused a higher fruit set in the longstyled morph than in the short-styled morph in both populations. Furthermore, the highest fruit set was observed in the most morphologically reciprocal population.

Angélica Maria Hernández-Ramírez "Distyly, Floral Visitors, and Fructification in 2 Natural Populations of Psychotria nervosa (Rubiaceae)," Ecoscience 19(2), 133-139, (1 June 2012). https://doi.org/10.2980/19-2-3452
Received: 15 March 2011; Accepted: 1 February 2012; Published: 1 June 2012
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KEYWORDS
analyse de survie
comportement du visiteur floral
floral morphology
floral visitor behaviour
morphologie florale
Psychotria nervosa
Psychotria nervosa
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