Influence of seed size on feeding preferences and diet composition of three sympatric harvester ants in the central Monte Desert, Argentina

Selective seed consumption by harvester ants may affect seed abundance and composition and, ultimately, plant communities. We evaluated the influence of seed size on preferences and diet of Pogonomyrmex mendozanus, P. rastratus, and P. inermis in the central Monte Desert, Argentina. In choice experi...

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Autor principal: Pirk, G.I
Otros Autores: de Casenave, J.L
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Publicado: 2010
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100 1 |a Pirk, G.I. 
245 1 0 |a Influence of seed size on feeding preferences and diet composition of three sympatric harvester ants in the central Monte Desert, Argentina 
260 |c 2010 
270 1 0 |m Pirk, G. I.; Laboratorio Ecotono, INIBIOMA, CONICET-Universidad Nacional del Comahue, Pasaje Gutiérrez 1125, 8400 Bariloche, Argentina; email: pirk@crub.uncoma.edu.ar 
506 |2 openaire  |e Política editorial 
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520 3 |a Selective seed consumption by harvester ants may affect seed abundance and composition and, ultimately, plant communities. We evaluated the influence of seed size on preferences and diet of Pogonomyrmex mendozanus, P. rastratus, and P. inermis in the central Monte Desert, Argentina. In choice experiments with Pappophorum spp. seeds of different sizes, P. mendozanus and P. rastratus preferred large seeds, maximizing energy reward. P. inermis showed a less-marked preference for large seeds, which was probably due to morphological constraints imposed by its small body size. Under natural conditions, none of the three species selected larger Pappophorum spp. seeds probably because of high travel and handling costs. Seeds of intermediate size predominated in the diet of the three species but a slight size match was detected as P. mendozanus carried larger seeds than P. rastratus and this than P. inermis, matching body-size differences. Thus, ants probably maximize energy reward but face morphological restrictions and higher costs when carrying and holding large seeds. While seeds of intermediate size are the most vulnerable ones to ant predation, small seeds are favored, as they are abundant in the soil seed bank and lowly predated. © The Ecological Society of Japan 2009.  |l eng 
536 |a Detalles de la financiación: PICT 2196 
536 |a Detalles de la financiación: Universidad de Buenos Aires, UBA-CyT X/120 
536 |a Detalles de la financiación: Sigma Xi 
536 |a Detalles de la financiación: Consejo Nacional de Investigaciones Científicas y Técnicas 
536 |a Detalles de la financiación: Acknowledgments We thank Chris Smith, Víctor Cueto, and Antonio Mangione for critical comments. Fernando Milesi and Luis Marone gave valuable advice. Financial support was supplied by CONICET, ANPCyT of Argentina (ultimately through PICT 2196), by Universidad de Buenos Aires (ultimately through UBA-CyT X/120) and by a Grant-in-aid of Research awarded by Sigma Xi. This is contribution number 68 of the Desert Community Ecology Research Team (Ecodes) of IADIZA Institute (CONI-CET) and FCEyN (Universidad de Buenos Aires). 
593 |a Grupo de Investigación en Ecología de Comunidades de Desierto, Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Piso 4, Pab. 2, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina 
593 |a Laboratorio Ecotono, INIBIOMA, CONICET-Universidad Nacional del Comahue, Pasaje Gutiérrez 1125, 8400 Bariloche, Argentina 
690 1 0 |a ANTS 
690 1 0 |a COMMUNITY ECOLOGY 
690 1 0 |a DESERT ECOSYSTEMS 
690 1 0 |a POGONOMYRMEX 
690 1 0 |a SEED SIZE 
690 1 0 |a ABUNDANCE 
690 1 0 |a ANT 
690 1 0 |a BODY SIZE 
690 1 0 |a COMMUNITY ECOLOGY 
690 1 0 |a DESERT 
690 1 0 |a FEEDING BEHAVIOR 
690 1 0 |a MORPHOLOGY 
690 1 0 |a PLANT COMMUNITY 
690 1 0 |a SEED PREDATION 
690 1 0 |a SEED SIZE 
690 1 0 |a SYMPATRY 
690 1 0 |a MONTE DESERT 
690 1 0 |a FORMICIDAE 
690 1 0 |a PAPPOPHORUM 
690 1 0 |a POGONOMYRMEX 
690 1 0 |a POGONOMYRMEX INERMIS 
690 1 0 |a POGONOMYRMEX RASTRATUS 
651 4 |a ARGENTINA 
651 4 |a MENDOZA 
700 1 |a de Casenave, J.L. 
773 0 |d 2010  |g v. 25  |h pp. 439-445  |k n. 2  |p Ecol. Res.  |x 09123814  |t Ecological Research 
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