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Gembloux Agro-Bio Tech (GxABT)
Gembloux Agro-Bio Tech (GxABT)
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Analyse de la dynamique des populations de ratons laveurs (Procyon lotor) en Wallonie et estimation des densités de population dans deux massifs forestiers par pièges photographiques

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Tossens, Simon ULiège
Promotor(s) : Licoppe, Alain
Date of defense : 5-Nov-2020 • Permalink : http://hdl.handle.net/2268.2/11001
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Title : Analyse de la dynamique des populations de ratons laveurs (Procyon lotor) en Wallonie et estimation des densités de population dans deux massifs forestiers par pièges photographiques
Translated title : [en] Analysis of the population dynamics of raccoons (Procyon lotor) in Wallonia and estimation of population densities in two forested areas using camera traps
Author : Tossens, Simon ULiège
Date of defense  : 5-Nov-2020
Advisor(s) : Licoppe, Alain 
Committee's member(s) : Vermeulen, Cédric ULiège
Lejeune, Philippe ULiège
Monty, Arnaud ULiège
Schockert, Vincianne ULiège
Branquart, Etienne 
Language : French
Number of pages : 80
Keywords : [fr] Procyon lotor
[fr] Raton laveur
[fr] Population dynamics
[fr] Camera traps
[fr] Random Encounter Model
[fr] Belgium
[fr] Invasive species
Discipline(s) : Life sciences > Environmental sciences & ecology
Funders : Département de l'Etude des Milieux Naturels et Agricoles (DEMNA - SPW)
Research unit : DEMNA
Target public : Researchers
Professionals of domain
Institution(s) : Université de Liège, Liège, Belgique
Degree: Master en bioingénieur : gestion des forêts et des espaces naturels, à finalité spécialisée
Faculty: Master thesis of the Gembloux Agro-Bio Tech (GxABT)

Abstract

[fr] As an invasive species, raccoons (Procyon lotor) present explosive population dynamics on a European scale, which worries scientists and natural areas managers with regard to the potential dangers they represent for native biodiversity and the "man-wildlife" conflicts they can provoke. In Wallonia, their presence has been proven since the early 2000s and observations have been increasing since 2010, but their population level remains unknown. This work first seeks to establish the population dynamics of the species in southern Wallonia (Belgium) by analyzing nocturnal abundance indices (INA) between 2010 and 2018. Its second objective is to estimate the population densities in two forested areas using camera traps, by applying the "Random Encounter Model (REM)". The INA, multiplied by 5 between 2010 and 2018, increases significantly over time at the scale of the 19 hunting councils in which raccoons have been observed. However, the method lacks precision due to the low detectability of the species during night counts and, even if the increasing trend is confirmed, the rate of expansion remains uncertain. This is especially true if data are analyzed individually by council as the number of observations is often too small and the biases too large. The REM, applied for the first time to this species, gives estimates of population densities of 2.26 - 4.22 individuals/100ha in Gaume and 2.12 - 3.39 in the Saint-Michel Freyr massif. Although subject to numerous biases, the REM is proving to be an interesting tool and allows plausible densities to be obtained, but points of comparison are currently lacking for evaluating its reliability.


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Author

  • Tossens, Simon ULiège Université de Liège > Gembloux Agro-Bio Tech

Promotor(s)

  • Licoppe, Alain Université de Liège - Ulg > GxABT > Gestion des ressources forestières et des milieux naturels

Committee's member(s)

  • Vermeulen, Cédric ULiège Université de Liège - ULiège > Département GxABT > Laboratoire de Foresterie des régions trop. et subtropicales
    ORBi View his publications on ORBi
  • Lejeune, Philippe ULiège Université de Liège - ULiège > Département GxABT > Gestion des ressources forestières et des milieux naturels
    ORBi View his publications on ORBi
  • Monty, Arnaud ULiège Université de Liège - ULiège > Département GxABT > Biodiversité et Paysage
    ORBi View his publications on ORBi
  • Schockert, Vincianne ULiège Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Zoogéographie
    ORBi View his publications on ORBi
  • Branquart, Etienne
  • Total number of views 280
  • Total number of downloads 971










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