title: Effect of plant nitrogen and water status on the foraging behavior and fitness of an omnivorous arthropod.
abstract: Omnivorous arthropods make dietary choices according to the environment in which they forage, mainly availability/quality of plant and/or prey resources. Such decisions and their subsequent impacts on life-history traits may be affected by the availability of nutrients and water to plants, that is, through bottom-up forces. By setting up arenas for feeding behavior observation as well as glasshouse cages for plant preference assessment, we studied effects of the presence of prey (Lepidoptera eggs) and nitrogen/water availability to host tomato plants on the foraging behavior and life-history traits in the omnivorous predator Macrolophus pygmaeus (Heteroptera: Miridae). In the absence of prey, the predator fed equally on the plants treated with various levels of nitrogen and water. In the presence of prey, however, the feeding rate on plants decreased when the plant received low water input. The feeding rate on prey was positively correlated with feeding rate on plants; that is, prey feeding increased with plant feeding when the plants received high water input. Moreover, plants receiving high water input attracted more M. pygmaeus adults compared with those receiving low water input. For M. pygmaeus fitness, the presence of prey enhanced its fertility and longevity, but the longevity decreased when plants received low compared with high water input. In conclusion, the omnivorous predator may be obliged to feed on plants to obtain water, and plant water status may be a limiting factor for the foraging behavior and fitness of the omnivorous predator.
authors.affiliation: INRA (French National Institute for Agricultural Research) Univ. Nice Sophia Antipolis CNRS UMR 1355-7254 Institut Sophia Agrobiotech 06903 Sophia Antipolis France.
authors.forename: Peng
authors.initials: P
authors.lastname: Han
authors.affiliation: INRA (French National Institute for Agricultural Research) Univ. Nice Sophia Antipolis CNRS UMR 1355-7254 Institut Sophia Agrobiotech 06903 Sophia Antipolis France; Hubei Insect Resources Utilization and Sustainable Pest Management Key Laboratory College of Plant Science and Technology Huazhong Agricultural University Wuhan 430070 China.
authors.forename: Yongcheng
authors.initials: Y
authors.lastname: Dong
authors.affiliation: INRA (French National Institute for Agricultural Research) Univ. Nice Sophia Antipolis CNRS UMR 1355-7254 Institut Sophia Agrobiotech 06903 Sophia Antipolis France.
authors.forename: Anne-Violette
authors.initials: AV
authors.lastname: Lavoir
authors.affiliation: INRA UR1115 PSH 228 Route de l'aérodrome 84914 Avignon France.
authors.forename: Stéphane
authors.initials: S
authors.lastname: Adamowicz
authors.affiliation: INRA (French National Institute for Agricultural Research) Univ. Nice Sophia Antipolis CNRS UMR 1355-7254 Institut Sophia Agrobiotech 06903 Sophia Antipolis France.
authors.forename: Philippe
authors.initials: P
authors.lastname: Bearez
authors.affiliation: INRA (French National Institute for Agricultural Research) Univ. Nice Sophia Antipolis CNRS UMR 1355-7254 Institut Sophia Agrobiotech 06903 Sophia Antipolis France.
authors.forename: Eric
authors.initials: E
authors.lastname: Wajnberg
authors.affiliation: INRA (French National Institute for Agricultural Research) Univ. Nice Sophia Antipolis CNRS UMR 1355-7254 Institut Sophia Agrobiotech 06903 Sophia Antipolis France.
authors.forename: Nicolas
authors.initials: N
authors.lastname: Desneux
keywords: Bottom‐up effect; fecundity; feeding behavior; longevity; omnivorous predator; plant preference