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Abstract:

Dominant herbivores, like leafcutter ants, have a strong impact on the ecosystems they inhabit. Understanding which factors regulate their foraging rates is crucial for understanding ecosystem dynamics. In desert habitats, environmental factors, such as temperature, play a major role in regulating ants' behavior. We studied the role of ground temperature in regulating daily and seasonal activity patterns of two coexisting leafcutters ant species, Acromyrmex lobicornis (EMERY, 1888) and A. striatus (ROGER, 1863), in the Monte desert of Argentina. We measured the variations in activity levels and soil temperature every two hours throughout the day in colonies of both species every season for two consecutive years. Temperature was a good predictor of both the timing of colony activation (the onset and end of their daily foraging activities) and foraging intensity (the number of workers devoted to foraging tasks). However, temperature affected each species differently: Acromyrmex lobicornis foraged at lower temperatures (10 - 35°C) than A. striatus (27 - 45°C). Our results suggest that these two species have different thermal tolerance ranges that result in temporally separated foraging activities. We suggest that interference competition may have driven this temperature and temporal specialization in these two sympatric species, given their similar sizes and diets. Field observations of activity vs. temperature in allopatry, and behavioral tests in controlled conditions should provide further evidence to test this hypothesis. © 2017 Österreichische Gesellschaft für Entomofaunistik.

Registro:

Documento: Artículo
Título:Coexisting in harsh environments: Temperature-based foraging patterns of two desert leafcutter ants (Hymenoptera: Formicidae: Attini)
Autor:Nobua-Behrmann, B.E.; Lopez De Casenave, J.; Milesi, F.A.; Farji-Brener, A.
Filiación:Desert Community Ecology Research Team (Ecodes), Depto. Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, IEGEBA (UBA-CONICET), Buenos Aires, Argentina
Buenos Aires Instituto de Investigaciones en Biodiversidad y Medioambiente (INIBIOMA), UNCO, CONICET, Junín-de-los-Andes, Argentina
Lab. Ecotono, CRUB, Universidad del Comahue, Bariloche, Argentina
Palabras clave:Acromyrmex; Foraging; Herbivory; Leafcutter ants; Temperature
Año:2017
Volumen:25
Página de inicio:41
Página de fin:49
Título revista:Myrmecological News
Título revista abreviado:Myrmecological News
ISSN:19944136
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_19944136_v25_n_p41_NobuaBehrmann

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Citas:

---------- APA ----------
Nobua-Behrmann, B.E., Lopez De Casenave, J., Milesi, F.A. & Farji-Brener, A. (2017) . Coexisting in harsh environments: Temperature-based foraging patterns of two desert leafcutter ants (Hymenoptera: Formicidae: Attini). Myrmecological News, 25, 41-49.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_19944136_v25_n_p41_NobuaBehrmann [ ]
---------- CHICAGO ----------
Nobua-Behrmann, B.E., Lopez De Casenave, J., Milesi, F.A., Farji-Brener, A. "Coexisting in harsh environments: Temperature-based foraging patterns of two desert leafcutter ants (Hymenoptera: Formicidae: Attini)" . Myrmecological News 25 (2017) : 41-49.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_19944136_v25_n_p41_NobuaBehrmann [ ]
---------- MLA ----------
Nobua-Behrmann, B.E., Lopez De Casenave, J., Milesi, F.A., Farji-Brener, A. "Coexisting in harsh environments: Temperature-based foraging patterns of two desert leafcutter ants (Hymenoptera: Formicidae: Attini)" . Myrmecological News, vol. 25, 2017, pp. 41-49.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_19944136_v25_n_p41_NobuaBehrmann [ ]
---------- VANCOUVER ----------
Nobua-Behrmann, B.E., Lopez De Casenave, J., Milesi, F.A., Farji-Brener, A. Coexisting in harsh environments: Temperature-based foraging patterns of two desert leafcutter ants (Hymenoptera: Formicidae: Attini). Myrmecological News. 2017;25:41-49.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_19944136_v25_n_p41_NobuaBehrmann [ ]