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The invasion of the Argentine ant Linepithema humile in Mediterranean ecosystems: impacts and efficacy of winter aggregations extirpation as a control methods

We studied the characteristics and effects of the Argentine ant invasion on the native ants and other arthropods. Moreover, we assessed the effects of L. humile winter nest aggregations extirpation on its population dynamics. We measured the spread of its invasion and evaluated its nest-site preferences. Artificial nests used as a control tool were also assessed. Results indicate that the invasion causes important changes in the native ant community structure. The invasion spread is influenced by air temperature, and habitat perturbations could be favouring a faster expansion. The extirpation diminished the abundance of this ant and disturbed its population dynamics. In order to make this method more efficient, extirpation should be made in the edge of the invasion, and should focus on nests under larger rocks where mature nests are more likely to be found. Finally, this method is proposed mainly for controlling its invasion in closed or isolated areas.

Es van comparar les caracter铆stiques i els efectes de la invasi贸 de la formiga argentina sobre la comunitat de formigues natives, i altres artr貌podes. Es va avaluar l鈥檈fecte de l鈥檈xtirpaci贸 d鈥檃gregacions de nius d鈥檋ivern, la selecci贸 de llocs de nidificaci贸 i l鈥櫭簊 de nius artificials com a eina de control, i es va mesurar la seva taxa d鈥檈xpansi贸. Es va trobar que la invasi贸 provoca canvis importants en la comunitat de formigues natives. La temperatura ambiental influeix en l鈥檈xpansi贸, i les pertorbacions de l鈥檋脿bitat podrien afavorir una propagaci贸 m茅s r脿pida. L鈥檈xtirpaci贸 disminueix la seva abund脿ncia i pertorba la seva din脿mica poblacional. L鈥檈xtirpaci贸 s鈥檋a de fer al marge de la invasi贸, i s鈥檋a de centrar en nius situats sota les pedres m茅s grans que 茅s on hi ha m茅s probabilitat de trobar nius madurs. Finalment, aquest m猫tode es proposa principalment per al control de la invasi贸 en 脿rees tancades o a茂llades.

Universitat de Girona

Manager: G贸mez L贸pez, Crisanto
Abril, S铆lvia
Other contributions: Universitat de Girona. Departament de Ci猫ncies Ambientals
Author: Enr铆quez Lenis, Martha Luc铆a
Date: 2012 December 20
Abstract: We studied the characteristics and effects of the Argentine ant invasion on the native ants and other arthropods. Moreover, we assessed the effects of L. humile winter nest aggregations extirpation on its population dynamics. We measured the spread of its invasion and evaluated its nest-site preferences. Artificial nests used as a control tool were also assessed. Results indicate that the invasion causes important changes in the native ant community structure. The invasion spread is influenced by air temperature, and habitat perturbations could be favouring a faster expansion. The extirpation diminished the abundance of this ant and disturbed its population dynamics. In order to make this method more efficient, extirpation should be made in the edge of the invasion, and should focus on nests under larger rocks where mature nests are more likely to be found. Finally, this method is proposed mainly for controlling its invasion in closed or isolated areas.
Es van comparar les caracter铆stiques i els efectes de la invasi贸 de la formiga argentina sobre la comunitat de formigues natives, i altres artr貌podes. Es va avaluar l鈥檈fecte de l鈥檈xtirpaci贸 d鈥檃gregacions de nius d鈥檋ivern, la selecci贸 de llocs de nidificaci贸 i l鈥櫭簊 de nius artificials com a eina de control, i es va mesurar la seva taxa d鈥檈xpansi贸. Es va trobar que la invasi贸 provoca canvis importants en la comunitat de formigues natives. La temperatura ambiental influeix en l鈥檈xpansi贸, i les pertorbacions de l鈥檋脿bitat podrien afavorir una propagaci贸 m茅s r脿pida. L鈥檈xtirpaci贸 disminueix la seva abund脿ncia i pertorba la seva din脿mica poblacional. L鈥檈xtirpaci贸 s鈥檋a de fer al marge de la invasi贸, i s鈥檋a de centrar en nius situats sota les pedres m茅s grans que 茅s on hi ha m茅s probabilitat de trobar nius madurs. Finalment, aquest m猫tode es proposa principalment per al control de la invasi贸 en 脿rees tancades o a茂llades.
Format: application/pdf
Document access: http://hdl.handle.net/10803/101512
Language: eng
Publisher: Universitat de Girona
Rights: ADVERTIMENT. L鈥檃cc茅s als continguts d鈥檃questa tesi doctoral i la seva utilitzaci贸 ha de respectar els drets de la persona autora. Pot ser utilitzada per a consulta o estudi personal, aix铆 com en activitats o materials d鈥檌nvestigaci贸 i doc猫ncia en els termes establerts a l鈥檃rt. 32 del Text Ref贸s de la Llei de Propietat Intel路lectual (RDL 1/1996). Per altres utilitzacions es requereix l鈥檃utoritzaci贸 pr猫via i expressa de la persona autora. En qualsevol cas, en la utilitzaci贸 dels seus continguts caldr脿 indicar de forma clara el nom i cognoms de la persona autora i el t铆tol de la tesi doctoral. No s鈥檃utoritza la seva reproducci贸 o altres formes d鈥檈xplotaci贸 efectuades amb finalitats de lucre ni la seva comunicaci贸 p煤blica des d鈥檜n lloc ali猫 al servei TDX. Tampoc s鈥檃utoritza la presentaci贸 del seu contingut en una finestra o marc ali猫 a TDX (framing). Aquesta reserva de drets afecta tant als continguts de la tesi com als seus resums i 铆ndexs.
Subject: Biologia
Title: The invasion of the Argentine ant Linepithema humile in Mediterranean ecosystems: impacts and efficacy of winter aggregations extirpation as a control methods
Type: doctoralThesis
Repository: TDX

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