Contrasting responses of above- and below-ground herbivore communities along elevation

• Published in: Oecologia Vol. 194; no. 3; pp. 515 - 528
• Main Authors: Pitteloud, Camille, Descombes, Patrice, Sànchez-Moreno, Sara, Kergunteuil, Alan, Ibanez, Sébastien, Rasmann, Sergio, Pellissier, Loïc
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Science + Business Media 01.11.2020; Springer Berlin Heidelberg; Springer; Springer Nature B.V; Springer Verlag
• Subjects: Abundance; Analysis; Biodiversity; Biodiversity and Ecology; Biological diversity; Biomedical and Life Sciences; Biota; Clines; Ecology; ECOSYSTEM ECOLOGY - ORIGINAL RESEARCH; Ecosystems; Environmental changes; Environmental Sciences; Food plants; Food processing plants; Gradients; Grasslands; Herbivores; Herbivory; Hydrology/Water Resources; Life Sciences; Nematoda; Nematodes; Plant Sciences; Properties; Properties (attributes); Sedentary behavior; Sedentary species; Soil; Species richness; Taxonomy; Variation; Ecological interactions; Herbivory; Functional traits; Environmental gradient; Species richness
• ISSN: 0029-8549; 1432-1939
• DOI: 10.1007/s00442-020-04778-7

Above- and below-ground herbivory are key ecosystem processes that can be substantially altered by environmental changes. However, direct comparisons of the coupled variations of above- and below-ground herbivore communities along elevation gradients remain sparse. Here, we studied the variation in assemblages of two dominant groups of herbivores, namely, above-ground orthoptera and belowground nematodes, in grasslands along six elevation gradients in the Swiss Alps. By examining variations of community properties of herbivores and their food plants along montane clines, we sought to determine whether the structure and functional properties of these taxonomic groups change with elevation. We found that orthoptera decreased in both species richness and abundance with elevation. In contrast with aboveground herbivores, the taxonomic richness and the total abundance of nematode did not covary with elevation. We further found a stronger shift in above- than below-ground functional properties along elevation, where the mandibular strength of orthoptera matched a shift in leaf toughness. Nematodes showed a weaker pattern of declined sedentary behavior and increased mobility with elevation. In contrast to the direct exposal of aboveground organisms to the surface climate, conditions may be buffered belowground, which together with the influence of edaphic factors on the biodiversity of soil biota, may explain the differences between elevational patterns of above- and below-ground communities. Our study emphasizes the necessity to consider both the above- and below-ground compartments to understand the impact of current and future climatic variation on ecosystems, from a functional perspective of species interactions.