Abstract
The determinants of diversity are a central issue in ecology, particularly in Andean forests that are known to be a major diversity hotspot for several taxa. We examined the effect of abiotic (elevation and precipitation) and biotic (flowering plant diversity) factors considered to be decisive causal factors of diversity patterns on anthophyllous insect communities on mountain forest. Sampling was carried out in 100-m transects at eight elevational levels and during a period of 8 months. All flowering plants in the understory and their flowering visitors were recorded. Species richness and diversity were estimated for each elevation and month. Diversity of flowering plants, elevation, and precipitation were used as independent variables in multiple regressions against insect diversity. The evaluated abiotic and biotic factors had contrasting effects on insect diversity: a significant decrease on insect diversity occurred at high elevation and dry months (i.e., threshold effect), while it showed a positive relationship with flowering plant diversity through time (i.e., linear effect), but not along elevation. Rapid turnover of species of both interacting guilds was observed every 100-m altitude and month. Local insect communities were also divided functionally depending on the plant family they visit. These results indicate that each insect community is distinctive among elevations and months and that diversity of flowering plants, precipitation, and elevation influence their structure and composition. Thus, conservation strategies should involve protection of forest cover at the whole elevation gradient, in order to preserve common and exclusive components of diversity and consequently, the mosaic of plant–pollinator interactions.
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Acknowledgments
Thanks to The Hummingbird Conservancy and Gustavo Suárez for the logistic support. We are greatly indebted to Martha Wolff (Colección Entomológica de Antioquia) for the assistance with identification of insects, Felipe Cardona and Alvaro Idarraga for the assistance with identification of plants (Herbario Universidad de Antioquia), and Liliana Ramírez and local assistants from Family Rendón-Agudelo for the field job. This work was supported by grant Comité para el Desarrollo de la Investigación CODI-Universidad de Antioquia CPT-0915.
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Cuartas-Hernández, S.E., Gómez-Murillo, L. Effect of Biotic and Abiotic Factors on Diversity Patterns of Anthophyllous Insect Communities in a Tropical Mountain Forest. Neotrop Entomol 44, 214–223 (2015). https://doi.org/10.1007/s13744-014-0265-2
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DOI: https://doi.org/10.1007/s13744-014-0265-2