Browsing by Autor "Ariel A. Arzabe"

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    Assessing the geographic dichotomy hypothesis with cacti in South America
    (Wiley, 2017) Ariel A. Arzabe; Luís F. Aguirre; M. P. Baldelomar; Marco A. Molina‐Montenegro
    The Cactaceae is one of the most conspicuous and ecologically important plant families in the world. Its species may have specialist or generalist pollination systems that show geographic patterns, which are synthesised in the Geographic Dichotomy Hypothesis. Here, we assess this hypothesis in five countries in both tropical and extratropical regions, evaluating the pollinator visitation rate and pollinator identity and abundance. We calculate the Shannon diversity index (H') and evenness (J) and evaluate differences between latitude parameters with a Student t-test. Overall, we found more specialised pollination systems in all tropical sites; the richness, diversity and evenness of pollinators was reduced in comparison to extratropical regions, where the pollination system was generalised. Our results support the geographic dichotomy hypothesis in the cacti of South America, suggesting that environmental factors underlying the latitudinal patterns can help to explain differences in the pollination syndrome between tropical and extratropical regions.
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    Pollination system of two endemic Bolivian cacti: <i>Harrisia tetracantha</i> and <i>Neoraimondia herzogiana</i>
    (2018) Ariel A. Arzabe; Luís F. Aguirre; Mariela Baldelomar
    Columnar cacti may present different mating systems that vary according to distinct factors, and the studies of these systems are essential to preserve cactus species. Bolivia is the fourth country with most diversity of Cactaceae, still scarce information about the reproductive biology of the endemic cactus species is known. Therefore, we assessed the pollination type, pollination syndrome and flower visitors of the endemic columnar cacti Harrisia tetracantha and Neoraimondia herzogiana. We hypothesize that they would present cross and self-pollination as strategies to ensure reproduction in the bioclimatic variable dry inter-Andean valleys.