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Abstract:

Understanding the underlying mechanisms causing diversity patterns is a fundamental objective in ecology and science-based conservation biology. Energy and environmental-heterogeneity hypotheses have been suggested to explain spatial changes in ant diversity. However, the relative roles of each one in determining alpha and beta diversity patterns remain elusive. We investigated the main factors driving spatial changes in ant (Hymenoptera, Formicidae) species richness and composition (including turnover and nestedness components) along a 500 km longitudinal gradient in the Pampean region of Argentina. Ants were sampled using pitfall traps in 12 sample sites during the summer. We performed a model selection approach to analyse responses of ant richness and composition dissimilarity to environmental factors. Then, we computed a dissimilarity partitioning of the contributions of spatial turnover and nestedness to total composition dissimilarity. Temporal habitat heterogeneity and temperature were the primary factors explaining spatial patterns of epigean ant species richness across the Pampas. The distance decay in species composition similarity was best accounted by temperature dissimilarity, and turnover had the greatest contribution to the observed beta diversity pattern. Our findings suggest that both energy and environmental-heterogeneity-related variables are key factors shaping richness patterns of ants and niche-based processes instead of neutral processes appear to be regulating species composition of ant assemblages. The major contribution of turnover to the beta diversity pattern indicated that lands for potential reconversion to grassland should represent the complete environmental gradient of the Pampean region, instead of prioritizing a single site with high species richness. © 2018 Ecological Society of Australia

Registro:

Documento: Artículo
Título:Environmental drivers of ant species richness and composition across the Argentine Pampas grassland
Autor:Ramos, C.S.; Isabel Bellocq, M.; Paris, C.I.; Filloy, J.
Filiación:Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Intendente Güiraldes 2160 - Pabellon II - Ciudad UniversitariaC1428EGA, Argentina
Palabras clave:diversity patterns; energy; environmental heterogeneity; nestedness; turnover; ant; conservation status; environmental factor; environmental gradient; grassland; longitudinal gradient; nestedness; pitfall trap; species diversity; species richness; Argentina; Pampas; Formicidae; Hymenoptera
Año:2018
Volumen:43
Número:4
Página de inicio:424
Página de fin:434
DOI: http://dx.doi.org/10.1111/aec.12579
Título revista:Austral Ecology
Título revista abreviado:Austral Ecol.
ISSN:14429985
CODEN:AUECF
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14429985_v43_n4_p424_Ramos

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Citas:

---------- APA ----------
Ramos, C.S., Isabel Bellocq, M., Paris, C.I. & Filloy, J. (2018) . Environmental drivers of ant species richness and composition across the Argentine Pampas grassland. Austral Ecology, 43(4), 424-434.
http://dx.doi.org/10.1111/aec.12579
---------- CHICAGO ----------
Ramos, C.S., Isabel Bellocq, M., Paris, C.I., Filloy, J. "Environmental drivers of ant species richness and composition across the Argentine Pampas grassland" . Austral Ecology 43, no. 4 (2018) : 424-434.
http://dx.doi.org/10.1111/aec.12579
---------- MLA ----------
Ramos, C.S., Isabel Bellocq, M., Paris, C.I., Filloy, J. "Environmental drivers of ant species richness and composition across the Argentine Pampas grassland" . Austral Ecology, vol. 43, no. 4, 2018, pp. 424-434.
http://dx.doi.org/10.1111/aec.12579
---------- VANCOUVER ----------
Ramos, C.S., Isabel Bellocq, M., Paris, C.I., Filloy, J. Environmental drivers of ant species richness and composition across the Argentine Pampas grassland. Austral Ecol. 2018;43(4):424-434.
http://dx.doi.org/10.1111/aec.12579