Cerambycid girdling and water stress modify mesquite architecture and reproduction |
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Authors: | Armando J Martínez J López-Portillo A Eben J Golubov |
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Institution: | (1) Instituto de Neuroetología, Universidad Veracruzana, Apartado Postal 566, Xalapa, 91190, Veracruz, Mexico;(2) Departamento de Ecología Funcional, Instituto de Ecología, A.C., Km. 2.5 antigua carretera a Coatepec 351, Xalapa, 91070, Veracruz, Mexico;(3) Laboratory Ecología, Sistemática y Fisiología Vegetal, Departamento El Hombre y Su Ambiente, Universidad Autónoma Metropolitana Xochimilco, Calz. del Hueso 1100, Col. Villa Quietud, Coyoacán, 04960, Mexico D.F., Mexico |
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Abstract: | This study evaluated the effect of an outbreak of the cerambycid beetle, Oncideres rhodosticta, on branch growth and inflorescence production of the mesquite Prosopis glandulosa var. torreyana, and on larvae mortality in girdled branches at two sites (dry and wet) in the southern Chihuahuan Desert of Mexico. We compared
stem growth responses to girdling in branches of similar sized trees from both sites over 42 months. The number of larvae
per girdled branch was similar between sites, indicating similar ovipositing effort regardless of water stress. However, the
proportion of dead larvae was significantly lower in trees at the dry site. On average, girdling reduced 96% of the stem length
at both sites. At the end of the first year, 25% of the original stubs survived at the dry site, compared to 90% at the wet
site. Girdling also broke apical dominance and allowed for the development of lateral buds from the surviving stubs, which
produced many fewer branches and inflorescences at the dry site compared to the wet site, where a compact crown was developed.
Water stress and girdling have a combined effect on mesquite architecture and reproduction, since more stubs died at the dry
site while new branches from surviving stubs developed at the wet site, recovering the original lost biomass but changing
the appearance of the tree. |
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Keywords: | Apical dominance ENSO Herbivory Predawn water potential Shoot regrowth Stem boring beetle |
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