Contrasting effects of heat pulses on different trophic levels, an experiment with a herbivore-parasitoid model system

Schreven Stijn J.J., Frago Enric, Stens Annemiek, De Jong Peter W., Van Loon Joop J.A.. 2017. Contrasting effects of heat pulses on different trophic levels, an experiment with a herbivore-parasitoid model system. PloS One, 12 (4):e0176704, 13 p.

https://doi.org/10.1371/journal.pone.0176704

Article de revue ; Article de recherche ; Article de revue à facteur d'impact Revue en libre accès total

Prévisualisation

Version publiée - Anglais
Sous licence

.
2017 Schreven frago et al PLoS ONE.pdf
Télécharger (1MB) | Prévisualisation

Url - jeu de données - Entrepôt autre : https://doi.org/10.5281/zenodo.218415

Quartile : Q1, Sujet : MULTIDISCIPLINARY SCIENCES

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Psychologie-éthologie-ergonomie; Staps

Résumé : Under predicted global climate change, species will be gradually exposed to warmer temperatures, and to a more variable climate including more intense and more frequent heatwaves. Increased climatic variability is expected to have different effects on species and ecosystems than gradual warming. A key challenge to predict the impact of climate change is to understand how temperature changes will affect species interactions. Herbivorous insects and their natural enemies belong to some of the largest groups of terrestrial animals, and thus they have a great impact on the functioning of ecosystems and on the services these ecosystems provide. Here we studied the life history traits of the plant-feeding insect Plutella xylostella and its specialist endoparasitoid Diadegma semiclausum, when exposed to a daily heat pulse of 5 or 10°C temperature increase during their entire immature phase. Growth and developmental responses differed with the amplitude of the heat pulse and they were different between host and parasitoid, indicating different thermal sensitivity of the two trophic levels. With a +5°C heat pulse, the adult parasitoids were larger which may result in a higher fitness, whereas a +10°C heat pulse retarded parasitoid development. These results show that the parasitoid is more sensitive than its host to brief intervals of temperature change, and this results in either positive or negative effects on life history traits, depending on the amplitude of the heat pulse. These findings suggest that more extreme fluctuations may disrupt host-parasitoid synchrony, whereas moderate fluctuations may improve parasitoid fitness.

Mots-clés Agrovoc : température, Plutella xylostella, changement climatique, parasitoïde, Ichneumonidae, Diadegma semiclausum, Diadegma, légume sec, cycle de développement

Mots-clés géographiques Agrovoc : France

Mots-clés libres : Plutella xylostella, Parasitoïde

Classification Agris : H10 - Ravageurs des plantes
P40 - Météorologie et climatologie

Champ stratégique Cirad : Axe 4 (2014-2018) - Santé des animaux et des plantes

Auteurs et affiliations