Mathis Joz-Roland

Master student

Research interest

Natural food-web ecosystems are mediated by different forces along trophic levels. Indeed, herbivore induce negative effects on plants on account of the feeding pressure enforced by the former on the latter. Similarly, predators have a negative impact on herbivores and reduce their impact on the whole ecosystem. By modifying directly or indirectly herbivores’ behaviors, predators positively influence plant growth. Thus, interaction modifications between plants and insects will have multiple consequences on ecosystem dynamics. Indeed, diverse functions such as decomposition, nutrient cycling or plant community structure can be affected.  
The aim of my research project consists in recording the impact of predators on herbivores and as a consequence, on the modulation of the ecosystem’s main functions. The Agelena labyrinthica, a spider specie will be used as the experiment’s predator and Chorthippus parallelus, a grasshopper specie, as the experiement’s herbivore. A community of nine plants with the soil in which they grow will be analyzed. The analyses will allow us to have a better understanding of trophic interactions. In addition, by leading the same experiment at different altitudes, it will be possible to mimic global warming. As a consequence, potential consequences of global warming on the ecosystem’s main functions will be highlighted.  

Main topics

  • Plant-insect interactions
  • Food web
  • Natural ecosystems dynamics
  • Global warming
  • Nutrient cycling
  • Matter degradation

Mathis Joz-Roland



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