Intercontinental union of Argentine ants: behavioral relationships among introduced populations in Europe, North America , and Asia.

Sunamura E, Espadaler X, Sakamato H, Suzuki S, Terayama M, Tatsuki S (2009) Intercontinental union of Argentine ants: behavioral relationships among introduced populations in Europe, North America , and Asia. Insectes Sociaux doi: 10.1007/s00040-009-0001-9 56: 143-147.

Primera cita de Amblyopone impressifrons (Emery, 1869) para la Península Ibérica y de Proceratium melinum (Roger, 1860) para Cataluña (Hymenoptera, Formicidae).

García F, Espadaler X, Gómez K (2009) Primera cita de Amblyopone impressifrons (Emery, 1869) para la Península Ibérica y de Proceratium melinum (Roger, 1860) para Cataluña (Hymenoptera, Formicidae). Boletín de la SEA 45: 357-360.

Lasius cinereus Seifert: descripción de la reina y datos biológicos.

Herrainz JA, Espadaler X (2009) Lasius cinereus Seifert: descripción de la reina y datos biológicos. Boletín Sociedad Entomológica Aragonesa 44: 143-146.

El Sot de la Masia, un paradís per a les formigues hipogees.

García F, Espadaler X, Roig X (2009) El Sot de la Masia, un paradís per a les formigues hipogees. Brolla 19: 10-11.

Detectado en Portugal Myzocallis (Lineomyzocallis) walshii (Hemiptera: Aphididae) sobre Quercus rubra.

Pérez Hidalgo N, Espadaler X, Mier MP (2009) Detectado en Portugal Myzocallis (Lineomyzocallis) walshii (Hemiptera: Aphididae) sobre Quercus rubra. Boletín Asociación Española Entomologia 33: 263-265.

Hormigas (Hymenoptera, Formicidae) del desfiladero de Mont-Rebei (Pallars Jussà).

Espadaler X, García F, Gómez K, Serrano S, Vila R (2009) Hormigas (Hymenoptera, Formicidae) del desfiladero de Mont-Rebei (Pallars Jussà). Boletín de la Sociedad entomológica Aragonesa 44: 393-399.

Worldwide spread of the Argentine ant, Linepithema humile (Hymenoptera: Formicidae).

Wetterer JK, Wild AL, Suárez AV, Roura-Pascual N, Espadaler X (2009) Worldwide spread of the Argentine ant, Linepithema humile (Hymenoptera: Formicidae). Myrmecological News 12: 187-194.

Mechanical defence in seeds to avoid predation by a granivorous ant

Oliveras J., Gómez C., Bas J.M., Espadaler X. (2008) Mechanical defence in seeds to avoid predation by a granivorous ant. Naturwissenschaften. 95: 501-506.
Link
Doi: 10.1007/s00114-008-0349-0

Abstract:

Harvester ants have traditionally been considered as seed predators that negatively affect plants. In some cases, however, they can also act as positive seed dispersers. During field observations, we noted that a portion of Psoralea bituminosa seeds that were collected and carried to the nest by the granivorous harvester ant Messor barbarus were discarded intact in refuse piles outside the nest. We analyzed and compared the physical characteristics of size, mass and toughness in P. bituminosa seeds from two different origins: intact seeds found in the ant's refuse piles and seeds collected directly from the plants. Seeds from refuse piles were similar in width but lighter and tougher than seeds from the plant. Our results point to a mechanical defence based on seed toughness to avoid predation by M. barbarus and suggest that an elevated proportion (~69%) of the seeds produced by P. bituminosa could be too tough to be consumed by this ant. These transported but uneaten seeds could benefit by being moved far from the mother plant and this could act as a selective evolutionary pressure towards tough seeds. © 2008 Springer-Verlag.

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Additions to the ant fauna of Portugal (Hymenoptera, Formicidae).

Espadaler X, Boieiro M, Azedo R, Bernardes C, Oliveira NG, Serrano ARM (2008) Additions to the ant fauna of Portugal (Hymenoptera, Formicidae). Boletín de la sociedad entomológica aragonesa 42: 349-351

La formiga del suro, Lasius brunneus. Resultats de l’estudi i protocol d’actuació.

Espadaler X, Bernal V (2008) La formiga del suro, Lasius brunneus. Resultats de l’estudi i protocol d’actuació. Silvicultura 56: 7-8.

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