Pression d'herbivorie et dynamique des communautés végétales : influence à court et moyen termes des populations de cervidés sur la diversité des communautés végétales en forêt

Abstract : This thesis aims at assessing the impacts of deer on forest vegetation composition, stratification and dynamics.We resampled a network of relevés coupling vegetation and browsing surveys, settled in 1976 in the national forest of Arc-en-Barrois. We identified (i) ligneous species that are either preferred (Cornus sp., Rosa arvensis) or avoided by deer, which tend to select shrubs species with dense wood and (ii) trophic level and browsing pressure as gradients that determine plant communities structures and dynamics. Then, we highlight the roles of deer in the spectacular expansion of Cynoglossum germanicum, a rare, epizoochorous and toxic species. According to a national network of exclosures, monitored for over 10 years, we show that deer limit shrubs and competing species growth, which in turn benefits to the herbaceous species richness probably through an increased light availability. Ecological and patrimonial value of the benefitting species is discussed. Using hunting statistics, we try to isolate the role of the various ungulate species in these dynamics.These results provide evidence for the diversity and complexity of deer impacts on forest vegetation. Finally, we demonstrate the need for long term monitoring programs, including all the forest ecosystem components so that we could better appreciate the forces driving the current changes
Complete list of metadatas

https://hal.univ-lorraine.fr/tel-01748562
Contributor : Thèses Ul <>
Submitted on : Thursday, March 29, 2018 - 11:38:20 AM
Last modification on : Tuesday, July 23, 2019 - 4:00:11 PM
Long-term archiving on : Friday, September 14, 2018 - 8:47:28 AM

File

SCD_T_2010_0039_BOULANGER.pdf
Files produced by the author(s)

Identifiers

  • HAL Id : tel-01748562, version 1

Collections

Citation

Vincent Boulanger. Pression d'herbivorie et dynamique des communautés végétales : influence à court et moyen termes des populations de cervidés sur la diversité des communautés végétales en forêt. Biologie animale. Université Henri Poincaré - Nancy 1, 2010. Français. ⟨NNT : 2010NAN10039⟩. ⟨tel-01748562⟩

Share

Metrics

Record views

23

Files downloads

72