RESUMO
Differences in the semi-natural vegetation of field margins will affect the biological control services derived from the presence of these semi-natural habitats adjacent to fields. Of the plant functional traits that are most relevant for insects, plant life forms reflect different aspects of plant structure and functioning that can help predict the value of marginal vegetation for arthropods in agricultural systems. The aim of this study was to determine the effect of the vegetation structure of field margins on cereal aphids and on some of their natural enemies (parasitoids, hoverflies and ladybugs) in terms of plant life forms. We characterized margin vegetation using the relative cover of each life form and sampled insects in crops along transects parallel to field margins. Our results show that in the studied areas, the abundance of natural enemies was greater near margins dominated by annual plants than in margins dominated by perennial plants. On the other hand, the abundances of aphids and parasitism rates were higher near margins dominated by perennial woody plants than near margins dominated by perennial herbaceous plants. By promoting specific life forms in existing margins, farmers can enhance the conservation biological control and relieve aphid pressure on their crops.
RESUMO
En las eventraciones gigantes la reintegración quirúrgica de las vísceras, posible bajo curarización, provoca aumentos de la presión intraabdominal que afectan a la evolución postoperatoria de estos pacientes. Valoramos la utilidad del control de la presión intravesical como guía durante el cierre de la pared abdominal para prevenir la aparición de hipertensión abdominal, así como durante el postoperatorio, lo que permite reconocer su presencia y establecer de forma temprana un tratamiento adecuado. (AU)
