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Wildlife trail or systematic? Camera trap placement has little effect on estimates of mammal diversity in a tropical forest in Gabon

Fonteyn, Davy ; Vermeulen, Cédric ; Deflandre, Nicolas ; [et al.]

Wiley ; 2021

In: Remote Sensing in Ecology and Conservation Vol. 7, No. 2 ( 2021-06), p. 321-336

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In: Remote Sensing in Ecology and Conservation, Wiley, Vol. 7, No. 2 ( 2021-06), p. 321-336

Abstract: Camera traps (CTs) have been increasingly used for wildlife monitoring worldwide. In the tropics, most CT inventories target wildlife‐friendly sites, and CTs are commonly placed towards wildlife trails. However, it has been argued that this placement strategy potentially provides biased results in comparison to more systematic or randomized approaches. Here, we investigated the impact of CT placement on the remotely sensed mammal diversity in a tropical forest in Gabon by comparing pairs of systematically placed and wildlife‐trail‐oriented CTs. Our survey protocol consisted of 15–17 sampling points arranged on a 2 km 2 grid and left for one month in the field. This protocol was replicated sequentially in four areas. Each sampling point comprised a CT pair: the ‘systematic CT’, installed at the theoretical point and systematically oriented towards the most uncluttered view; and the ‘trail CT’, placed within a 20‐m radius and facing a wildlife trail. For the vast majority of species, the detection probabilities were comparable between placements. Species average capture rates were slightly higher for trail‐based CTs, though this trend was not significant for any species. Therefore, the species richness and composition of the overall community, such as the spatial distribution patterns (from evenly spread to site‐restricted) of individual species, were similarly depicted by both placements. Opting for a systematic orientation ensures that pathways used preferentially by some species—and avoided by others—will be sampled proportionally to their density in the forest undergrowth. However, trail‐based placement is routinely used, already producing standardised data within large‐scale monitoring programmes. Here, both placements provided a comparable picture of the mammal community, though it might not be necessarily true in depauperate areas. Both types of CT data can nevertheless be combined in multi‐site analyses, since methods now allow accounting for differences in study design and detection bias in original CT data.

Type of Medium: Online Resource

ISSN: 2056-3485 , 2056-3485

URL: Issue

URL: Article

DOI: 10.1002/rse2.v7.2

DOI: 10.1002/rse2.191

Language: English

Publisher: Wiley

Publication Date: 2021

detail.hit.zdb_id: 2825232-9

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Range extension of the agile mangabey ( Cercocebus agilis ) and of the mandrill ( Mandrillus sphinx ) in eastern Gabon evidenced by camera traps

Fonteyn, Davy ; Fayolle, Adeline ; Orbell, Christopher ; [et al.]

Wiley ; 2022

In: African Journal of Ecology Vol. 60, No. 4 ( 2022-12), p. 1267-1270

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In: African Journal of Ecology, Wiley, Vol. 60, No. 4 ( 2022-12), p. 1267-1270

Type of Medium: Online Resource

ISSN: 0141-6707 , 1365-2028

URL: Issue

URL: Article

DOI: 10.1111/aje.v60.4

DOI: 10.1111/aje.13061

Language: English

Publisher: Wiley

Publication Date: 2022

detail.hit.zdb_id: 2019879-6

SSG: 12

SSG: 14

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État des populations des mammifères terrestres dans la Réserve de Biosphère de Luki (République démocratique du Congo)

Djami*, Yvan Kwidja ; Fonteyn*, Davy ; Ngabinzeke, Jean Semeki ; [et al.]

University of Liege ; 2023

In: BASE

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In: BASE, University of Liege

Abstract: Status of terrestrial mammal populations in the Luki Biosphere Reserve (Democratic Republic of Congo) Description of the subject. Mammal wildlife inside the Luki Biosphere Reserve in the Democratic Republic of Congo is under strong anthropic pressure, threatening its integrity. Objectives. This study aims to characterize the diversity and conservation status of the Reserve's mammalian animal community, which has not been documented to date. Method. To carry out this analysis, a grid of 40 camera traps was set up for 90 days within the core area of the Reserve, covering an area of 32 km². Simultaneously, daily monitoring of hunting activity was conducted amongst 50 hunters for 63 days, all from five villages located on the periphery of the reserve. Results. We identified 14 mammalian taxa based on camera trap observations, all of which were identified at least at the genus level, including the endangered chimpanzee (Pan troglotydes). A total of 18 species were hunted during the entire research period. Among the major groups of animals recorded by the two survey approaches, rodents were the most important, representing 86.4 % of camera trap detections and 66.9% of hunted animals, respectively. Medium-sized species, such as duikers, are rarely detected or caught. Compared with other Central African protected areas studied with comparable sampling devices and rates, the Luki Biosphere Reserve appears quite poor, both in terms of richness and diversity. Conclusions. These results suggest a strong alteration of the mammalian community present in the Luki Biosphere Reserve, despite the presence of a small relict population of chimpanzees. Furthermore, the lack of large and medium-sized species in offtake data and their very low detection rates by camera traps indicates the urgent need to increase monitoring efforts and questions the participatory management policy of the reserve that has been in place for nearly 20 years.

Type of Medium: Online Resource

ISSN: 1780-4507 , 1370-6233

URL: Journal

URL: Article

DOI: 10.25518/1780-4507

DOI: 10.25518/1780-4507.20430

Language: French

Publisher: University of Liege

Publication Date: 2023

detail.hit.zdb_id: 2045320-6

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Conservation value of tropical forests: Distance to human settlements matters more than management in Central Africa

Lhoest, Simon ; Fonteyn, Davy ; Daïnou, Kasso ; [et al.]

Elsevier BV ; 2020

In: Biological Conservation Vol. 241 ( 2020-01), p. 108351-

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In: Biological Conservation, Elsevier BV, Vol. 241 ( 2020-01), p. 108351-

Type of Medium: Online Resource

ISSN: 0006-3207

URL: Article

DOI: 10.1016/j.biocon.2019.108351

Language: English

Publisher: Elsevier BV

Publication Date: 2020

detail.hit.zdb_id: 1496231-7

SSG: 12

SSG: 23

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Daily Activity Patterns and Co-Occurrence of Duikers Revealed by an Intensive Camera Trap Survey across Central African Rainforests

Houngbégnon, Fructueux G. A. ; Cornelis, Daniel ; Vermeulen, Cédric ; [et al.]

MDPI AG ; 2020

In: Animals Vol. 10, No. 12 ( 2020-11-24), p. 2200-

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In: Animals, MDPI AG, Vol. 10, No. 12 ( 2020-11-24), p. 2200-

Abstract: The duiker community in Central African rainforests includes a diversity of species that can coexist in the same area. The study of their activity patterns is needed to better understand habitat use or association between the species. Using camera traps, we studied the temporal activity patterns, and quantified for the first time the temporal overlap and spatial co-occurrence between species. Our results show that: (i) Two species are strongly diurnal: Cephalophus leucogaster, and Philantomba congica, (ii) two species are mostly diurnal: C.callipygus and C. nigrifrons, (iii) one species is strongly nocturnal: C.castaneus, (iv) and one species is mostly nocturnal: C.silvicultor. Analyses of temporal activities (for five species) identified four species pairs that highly overlapped (Δ^≥ 0.80), and six pairs that weakly overlapped (Δ^ between 0.06 and 0.35). Finally, co-occurrence tests reveal a truly random co-occurrence (plt 〉 0.05 and pgt 〉 0.05) for six species pairs, and a positive co-occurrence (pgt 〈 0.05) for four pairs. Positive co-occurrences are particularly noted for pairs formed by C.callipygus with the other species (except C. nigrifrons). These results are essential for a better understanding of the coexistence of duikers and the ecology of poorly known species (C. leucogaster and C. nigrifrons), and provide clarification on the activity patterns of C. silvicultor which was subject to controversy. Camera traps proved then to be a powerful tool for studying the activity patterns of free-ranging duiker populations.

Type of Medium: Online Resource

ISSN: 2076-2615

URL: Article

DOI: 10.3390/ani10122200

Language: English

Publisher: MDPI AG

Publication Date: 2020

detail.hit.zdb_id: 2606558-7

SSG: 23

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A camera trap survey in the community zone of Lobéké National Park (Cameroon) reveals a nearly intact mammalian community

Poulain, Florine ; Breuer, Thomas ; Fonteyn, Davy ; [et al.]

Wiley ; 2023

In: African Journal of Ecology Vol. 61, No. 2 ( 2023-06), p. 523-529

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In: African Journal of Ecology, Wiley, Vol. 61, No. 2 ( 2023-06), p. 523-529

Abstract: Évaluer la richesse et l'abondance des espèces animales reste un élément clé de toute stratégie de conservation d'une zone donnée. Dans les environnements éloignés et difficiles tels que les forêts tropicales, les caméras‐pièges se sont avérées efficaces pour documenter les communautés secrètes d'animaux sauvages par rapport aux autres méthodes d'enquête, car elles permettent un suivi continu sans la présence d'un observateur humain. Dans cette étude, nous avons utilisé des caméras‐pièges pour caractériser la communauté des mammifères terrestres de taille moyenne et grande dans la zone communautaire du parc national de Lobeke, dans le sud‐est du Cameroun. Sur une période de 5 semaines, nous avons déployé une grille de 40 caméras‐pièges, enregistrant 5156 événements de détection indépendants sur 1284 jours de surveillance. 35 espèces ont été enregistrées, la plupart d'entre elles présentant des taux de détection élevés par rapport à d'autres sites d'Afrique centrale. Les résultats obtenus montrent que la zone étudiée est peu perturbée au sein du parc, malgré son accessibilité aux communautés locales. Grâce à ces résultats obtenus à partir d'une approche standardisée utilisant une technologie en expansion, nous disposons d'informations précieuses sur la communauté faunique de Lobéké et de nouvelles perspectives pour concilier les activités humaines et la conservation de la faune.

Type of Medium: Online Resource

ISSN: 0141-6707 , 1365-2028

URL: Issue

URL: Article

DOI: 10.1111/aje.v61.2

DOI: 10.1111/aje.13109

Language: English

Publisher: Wiley

Publication Date: 2023

detail.hit.zdb_id: 2019879-6

SSG: 12

SSG: 14

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Biogeography of central African forests: Determinants, ongoing threats and conservation priorities of mammal assemblages

Fonteyn, Davy ; Vermeulen, Cédric ; Gorel, Anaïs‐Pasiphaé ; [et al.]

Wiley ; 2023

In: Diversity and Distributions Vol. 29, No. 6 ( 2023-06), p. 698-712

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In: Diversity and Distributions, Wiley, Vol. 29, No. 6 ( 2023-06), p. 698-712

Abstract: Central Africa shelters diverse and iconic megafauna, which is threatened by climate and land‐use changes and increased hunting‐induced defaunation. Though crucial for coordinating regional conservation actions, how species assemblages are spatially structured remains poorly understood. This study aims to fill this knowledge gap for mammals across central African forests. Location Tropical moist forests from Nigeria to the Albertine Rift. Methods An extensive compilation of forest‐dwelling mammal species lists was made from wildlife and bushmeat‐related surveys across central Africa. A beta‐diversity approach enabling the clustering of surveys composed of similar species was implemented to identify and delimit zoogeographic districts, separately for three well‐documented mammal orders: carnivores, primates and artiodactyls. Random forest classification models were then used to identify the environmental determinants of the district's distribution and to produce a continuous zoogeographic map (and associated uncertainties) critical to assess the conservation status of each district and their ongoing threats. Results While carnivores do not present a clear spatial structure within central African forests, our findings highlight the structuring role of rivers on both primate and artiodactyl assemblages' distributions. We retained eight and six spatially congruent districts for primates and artiodactyls, respectively. These districts were shaped by the Ubangi‐Congo River system, and the Cross and Sanaga Rivers, with a secondary role of insularity and precipitation identified for primates. Highly threatened districts were highlighted, especially in Nigeria and in the Democratic Republic of Congo, the latter including vast areas that are understudied and poorly represented in the protected area network. Main Conclusions Beyond refining our understanding of the diversity and uniqueness of mammalian assemblages across central African forests, our map of zoogeographic districts has far‐reaching implications for the conservation of highly threatened taxa, allowing to target species and areas of interest for further sampling, conservation and rewilding efforts.

Type of Medium: Online Resource

ISSN: 1366-9516 , 1472-4642

URL: Issue

URL: Article

DOI: 10.1111/ddi.v29.6

DOI: 10.1111/ddi.13677

Language: English

Publisher: Wiley

Publication Date: 2023

detail.hit.zdb_id: 2020139-4

detail.hit.zdb_id: 1443181-6

SSG: 12

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Banque de graines du sol et déterminants de la germination du tali, Erythrophleum suaveolens (Guill. & Perr.) Brenan

Douh, Chauvelin ; Gorel, Anaïs-Pasiphaé ; Daïnou, Kasso ; [et al.]

CIRAD (Centre de Cooperation Internationale en Recherche Agronomique Pour le Developpement) ; 2019

In: BOIS & FORETS DES TROPIQUES Vol. 338 ( 2019-02-11), p. 43-

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In: BOIS & FORETS DES TROPIQUES, CIRAD (Centre de Cooperation Internationale en Recherche Agronomique Pour le Developpement), Vol. 338 ( 2019-02-11), p. 43-

Abstract: Cette étude évalue l’abondance des graines d’Erythrophleum suaveolens dans la banque de semences du sol des forêts denses humides d’Afrique centrale. Les travaux ont été menés au Nord-Congo dans deux types forestiers : la forêt à Celtis sur des sols argilo-sableux à sablo-argileux et la forêt à Manilkara sur des sols sableux. Les tiges d’E. suaveolens (dhp ≥ 10 cm) ont été inventoriées dans deux blocs de 400 ha, et les structures diamétriques de leurs populations ont été comparées. En outre, 80 fosses (2 x 40 fosses par type de forêt) ont été creusées au pied de 20 arbres (10 par forêt), sur trois couches contiguës de 10 cm chacune, soit à une profondeur totale de 30 cm, et l’abondance des graines dans la banque de semences du sol a été évaluée. La dormance des graines récoltées a été testée par des essais de germination après traitement au H2SO4 et cinq graines prélevées jusqu'à une profondeur de 20 cm dans la forêt à Celtis ont été utilisées pour estimer leur âge par spectroscopie de masse par accélérateur (AMS). Dans les deux types forestiers, les structures diamétriques présentent une distribution gaussienne, illustrant un déficit de régénération. Alors que les densités de tiges (dhp ≥ 10 cm) sont proches, avec 0,85 et 1,05 tige/ha respectivement, dans la forêt à Celtis et la forêt à Manilkara. Les densités de graines sont significativement plus élevées dans la forêt à Celtis (8,55 graines/m2) que dans la forêt à Manilkara (0,15 graine/m2). Le pourcentage maximum de germination obtenu était de 19,1 % pour des graines n’ayant subi aucun traitement. Les lots traités à l’acide ont présenté de moindres taux de germination. Ces graines semblent pouvoir se conserver une dizaine d’années au moins dans la banque du sol. Les facteurs pouvant influencer les variations de densité des graines sont discutés et des recommandations sylvicoles sont formulées.

Type of Medium: Online Resource

ISSN: 1777-5760 , 0006-579X

URL: Article

DOI: 10.19182/bft2018.338.a31681

Language: Unknown

Publisher: CIRAD (Centre de Cooperation Internationale en Recherche Agronomique Pour le Developpement)

Publication Date: 2019

detail.hit.zdb_id: 2249917-9

SSG: 23

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EUV Frankfurt

TH Wildau

FH Potsdam

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