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An assessment of the terrestrial mammal diversity in a sustainably logged forest in east Gabon: Impact of camera trap placement strategy on the detected species
Fonteyn, Davy; Cornélis, Daniel; Deflandre, Nicolas et al.
201956ème meeting de l'Association for Tropical Biology and Conservation (ATBC)
 

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Keywords :
camera trap; tropical forest; Gabon
Abstract :
[en] Camera traps are widely used for assessing terrestrial vertebrate diversity across tropical forests. Non-random placement strategy is traditionally adopted, with camera traps oriented towards specific features such as game trails. However, this could artificially bias the capture rates of certain species. Here, we first assessed the terrestrial mammal diversity of sustainably logged forests in east Gabon. Then, we investigated the impact of placement strategy on the detected diversity by comparing game-trail based and systematically oriented camera traps. We followed a grid design replicated consecutively in four areas, composed of 15-17 sampling points placed every 2 km², and left for one month on the field. Each sampling point was composed of two cameras: the ‘systematic camera’ was placed close to the theoretical point and oriented towards a naturally cleared area, while the ‘game-trail oriented camera’ was located within a 20 m radius of the random camera. A total of 31 mammal species were identified, including gorillas, chimps, elephants, and leopards. Game-trail placement provided greater relative abundance for most species and the deviation to this pattern only concerned extremely infrequent species (sitatunga, golden cat). Multivariate analyses did not distinguish different species composition between the two strategies at the site scale (grid), although local differences did appear between pairs at the camera scale. When examining species occupancy, game-trail strategy does not seem to bias inventories compared to the random placement, and data from both strategies can be used in multi-site analyses, but this does not hold true for relative abundance. However, it is almost impossible to set up a strict random sampling and both strategies need a subjective decision when installing camera traps. We recommend maintaining game-trail orientation for large-scale camera trapping inventories conducted at species or community level.
Disciplines :
Environmental sciences & ecology
Author, co-author :
Fonteyn, Davy  ;  Université de Liège - ULiège > Ingénierie des biosystèmes (Biose) > Gestion des ressources forestières et des milieux naturels
Cornélis, Daniel;  CIRAD, UPR Forêts et Sociétés, Univ. Montpellier, Montpellier Cedex 5, France
Deflandre, Nicolas;  Precious Woods Gabon - CEB. BP 2262 Batterie 4. Libreville, Gabon.
Fayolle, Adeline  ;  Université de Liège - ULiège > Ingénierie des biosystèmes (Biose) > Gestion des ressources forestières et des milieux naturels
Doucet, Jean-Louis ;  Université de Liège - ULiège > Ingénierie des biosystèmes (Biose) > Laboratoire de Foresterie des régions trop. et subtropicales
Vermeulen, Cédric ;  Université de Liège - ULiège > Ingénierie des biosystèmes (Biose) > Laboratoire de Foresterie des régions trop. et subtropicales
Language :
English
Title :
An assessment of the terrestrial mammal diversity in a sustainably logged forest in east Gabon: Impact of camera trap placement strategy on the detected species
Alternative titles :
[fr] Une évaluation de la diversité de mammifères terrestres au sein d'une forêt exploitée durablement dans l'est du Gabon : Impact de la stratégie de placement du piège photographique sur les epsèces détectées.
Publication date :
August 2019
Event name :
56ème meeting de l'Association for Tropical Biology and Conservation (ATBC)
Event place :
Antananarivo, Madagascar
Event date :
du 30 juillet au 3 août 2019
Audience :
International
Funders :
ULiège - Université de Liège [BE]
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
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since 19 August 2019

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