References of "Poncin, Pascal"
     in
Bookmark and Share    
Full Text
Peer Reviewed
See detailSeed shadows of northern pigtailed macaques within a degraded forest fragment, Thailand
Gazagne, Eva ULiege; Pitance, Jean-Luc ULiege; Savini, Tommaso ULiege et al

in Revue de Primatologie (2020, December 10), 11

Determining seed shadow (i.e. seed deposition pattern of a plant population) produced by frugivores is difficult to evaluate by direct observations, although of paramount importance to understand their ... [more ▼]

Determining seed shadow (i.e. seed deposition pattern of a plant population) produced by frugivores is difficult to evaluate by direct observations, although of paramount importance to understand their effectiveness as seed dispersal agents in degraded habitat. We developed a modeling approach of seed shadows incorporating field-collected data on a troop of 141 ± 10 individuals of northern pigtailed macaques (Macaca leonina) inhabiting a degraded forest fragment in Thailand, by implementing a mechanistic model of seed deposition with random components. We parameterized the model with macaque feeding behavior (i.e. consumed fruit species, seed treatments), gut and cheek pouch retention time, location of feeding sites and sleeping sites, monthly photoperiod, and movement patterns based on monthly native fruit availability using Hidden Markov models (HMM). We found that northern pigtailed macaques dispersed a majority of medium- to large-seeded species across large distances (mean > 500 m, maximum distance of 2300 m), promoting genetic mixing and colonization of plantation forests. Additionally, the macaques produced complementary seed shadows, with a sparse distribution of seeds spat out locally (mean > 50 m, maximum distance of 870 m) that probably ensures seedling recruitment of the immediate plant populations. Macaques’ large dispersal distance reliability is often underestimated and overlooked; however, their behavioral flexibility places them among the last remaining dispersers of large seeds in disturbed habitats. Our study shows that this taxon is likely to maintain significant seed dispersal services and promote forest regeneration in degraded forest fragments. [less ▲]

Detailed reference viewed: 26 (4 ULiège)
Full Text
Peer Reviewed
See detailSeed Shadows of Northern Pigtailed Macaques within a Degraded Forest Fragment, Thailand
Gazagne, Eva ULiege; Pitance, Jean-Luc ULiege; Savini, Tommaso ULiege et al

in Forests (2020), 11(1184), 1-24

Abstract: Research Highlights: Frugivores able to disperse large seeds over large distances are indispensable for seedling recruitment, colonization and regeneration of tropical forests. Understanding ... [more ▼]

Abstract: Research Highlights: Frugivores able to disperse large seeds over large distances are indispensable for seedling recruitment, colonization and regeneration of tropical forests. Understanding their effectiveness as seed dispersal agents in degraded habitat is becoming a pressing issue because of escalating anthropogenic disturbance. Although of paramount importance in the matter, animal behaviour’s influence on seed shadows (i.e., seed deposition pattern of a plant population) is difficult to evaluate by direct observations. Background and Objectives: We illustrated a modeling approach of seed shadows incorporating field-collected data on a troop of northern pigtailed macaques (Macaca leonina) inhabiting a degraded forest fragment in Thailand, by implementing a mechanistic model of seed deposition with random components. Materials and Methods: We parameterized the mechanistic model of seed deposition with macaque feeding behavior (i.e., consumed fruit species, seed treatments), gut and cheek pouch retention time, location of feeding and sleeping sites, monthly photoperiod and movement patterns based on monthly native fruit availability using Hidden Markov models (HMM). Results: We found that northern pigtailed macaques dispersed at least 5.5% of the seeds into plantation forests, with a majority of medium- to large-seeded species across large distances (mean > 500 m, maximum range of 2300 m), promoting genetic mixing and colonization of plantation forests. Additionally, the macaques produced complementary seed shadows, with a sparse distribution of seeds spat out locally (mean >50 m, maximum range of 870 m) that probably ensures seedling recruitment of the immediate plant populations. Conclusions: Macaques’ large dispersal distance reliability is often underestimated and overlooked; however, their behavioral flexibility places them among the last remaining dispersers of large seeds in disturbed habitats. Our study shows that this taxon is likely to maintain significant seed dispersal services and promote forest regeneration in degraded forest fragments. [less ▲]

Detailed reference viewed: 33 (7 ULiège)
Full Text
Peer Reviewed
See detailA meta-analysis of anthropogenic impacts on physiological stress in wild primates
Kaisin, Olivier ULiege; Fuzessy, Lisieux; Poncin, Pascal ULiege et al

in Conservation Biology (2020), 0(0), 1-14

As humanity continues to alter the environment extensively, comprehending the effect of anthro- pogenic disturbances on the health, survival, and fitness of wildlife is a crucial question for conservation ... [more ▼]

As humanity continues to alter the environment extensively, comprehending the effect of anthro- pogenic disturbances on the health, survival, and fitness of wildlife is a crucial question for conservation science. Many primate populations occupy suboptimal habitats prone to diverse anthropogenic disturbances that may be sources of acute and chronic stress. Quantification of glucocorticoid (GC) concentrations has repeatedly been used to explore the impact of disturbances on physiological stress. Although it is still debated, prolonged elevation of GC levels may impair reproduction, growth, and immune system activity of individuals. We quantified the effect of anthropogenic disturbances on physiological stress in primates with a global meta-analysis based on data from 26 articles, covering 24 distinct species in 13 different countries. Anthropogenic disturbances were classified into 6 distinct categories: habitat loss, habitat degradation, ongoing logging, hunting, tourism, and other human activities. We calculated effect sizes (Hedges’ g) with the standardized mean difference in GC concentrations between primates affected by human activity and their undisturbed conspecifics. We ran random-effects models and subgroup analyses to estimate the overall effect as well as a cumulative effect size for each disturbance category. Overall, primates inhabiting sites subject to anthropogenic disturbances exhibited significantly higher GC levels (g = 0.60; 95% CI: 0.28–0.93). Habitat loss and hunting were overall associated with increased GC con- centrations, whereas the cumulative effects of the other disturbances were not statistically significant. Biologically, high GC levels may increase fitness by enabling individuals to overcome the challenges linked to anthropogenic disturbances. However, primates in disturbed environments may have sustained elevated GC levels. To strengthen future research, it is necessary to control confounding factors systematically (e.g., diet, reproductive status, preda- tory pressure, and resource availability) and improve understanding of the link between GC levels and the health, fitness, and survival of animals. [less ▲]

Detailed reference viewed: 45 (4 ULiège)
Full Text
See detailEvaluation de la qualite biologique des rivieres Wallonnes sur base des indices biologiques poissons. Support technique aux inventaires 2020
Dierckx, Arnaud ULiege; Benitez, Jean-Philippe ULiege; Renardy, Séverine ULiege et al

Report (2020)

Ce document reprend les informations recueillies dans le cadre d’un travail effectué par l’Université de Liège pour le compte du Service public de Wallonie-DEMNA et financé dans le cadre d’un marché ... [more ▼]

Ce document reprend les informations recueillies dans le cadre d’un travail effectué par l’Université de Liège pour le compte du Service public de Wallonie-DEMNA et financé dans le cadre d’un marché public de services qui a pour objectif l’évaluation de la qualité biologique des eaux de surface basée sur les indices biologiques « poissons » dans huit cours d’eau de Wallonie. Cette mission s’inscrit dans le contexte de la mise en oeuvre de la Directive cadre 2000/60/CE établissant un cadre pour une politique communautaire dans le domaine de l’eau. Ce rapport présente les résultats des inventaires piscicoles effectués en mai, juin et juillet 2020 [less ▲]

Detailed reference viewed: 35 (1 ULiège)
Full Text
Peer Reviewed
See detailToward a better understanding of habituation process to human observer: A statistical approach in Macaca leonina (Primates: Cercopithecidea)
Gazagne, Eva ULiege; Hambuckers, Alain ULiege; Savini, Tommaso ULiege et al

in Raffles Bulletin of Zoology (2020), 68(2020), 735-749

Habituation allows an observer to closely approach and follow free-ranging animals, as they no longer respond to the observer presence (e.g., through flight, avoidance, display, curiosity). While ... [more ▼]

Habituation allows an observer to closely approach and follow free-ranging animals, as they no longer respond to the observer presence (e.g., through flight, avoidance, display, curiosity). While habituation is implicitly acknowledged as a necessary step before any direct observational studies of primates, there is very little published data on the subject. The aim of this study is to analyse the habituation process over time (17 months) in a wildfeeding troop of northern pigtailed macaques (Macaca leonina) inhabiting a degraded forest fragment of the Sakaerat Biosphere Reserve, Thailand. Based on the number of encounters, contact duration with the studied troop, and behavioural responses to the observer recorded ad libitum and via scan sampling, we found statistical evidence of habituation progress over five stages: early, minimal, partial, advanced, and full. The complete habituation process took nearly 13 months. Factors such as the macaques’ limited experience of human contact, semi-terrestriality, large ranging patterns, fission-fusion dynamics, unpredictable resource use, as well as reduced native fruit availability in this degraded forest fragment may explain the length of the process. It was only possible to collect ranging and behavioural data from the partial habituation stage, although these data were biased toward adult males and sub-adults, while overestimating movement behaviour over inactivity and social behaviours. Our results highlight the importance of analysing behavioural data of fully habituated groups of primates to limit biases of observer presence, and also of not underestimating the habituation process length. This study provides novel information on the habituation process in macaques and proposes an effective methodology to analyse the habituation process across a wide range of primate species. [less ▲]

Detailed reference viewed: 109 (8 ULiège)
Full Text
Peer Reviewed
See detailWhen Northern Pigtailed Macaques (Macaca leonina) Cannot Select for Ideal Sleeping Sites in a Degraded Habitat
Gazagne, Eva ULiege; Savini, Tommaso ULiege; Ngoprasert, Dusit et al

in International Journal of Primatology (2020), 41(4), 614-633

Primates must select sleeping sites carefully to maximize fitness. In habitats with diminished quality and availability of resources, sleeping site selection becomes an even more crucial aspect of primate ... [more ▼]

Primates must select sleeping sites carefully to maximize fitness. In habitats with diminished quality and availability of resources, sleeping site selection becomes an even more crucial aspect of primate survival. We investigated sleeping site selection patterns in northern pigtailed macaques (Macaca leonina) living in a degraded habitat by testing the hypotheses of random selection, predation avoidance, and food proximity. We followed a group of northern pigtailed macaques in Sakaerat Biosphere Reserve, northeastern Thailand, over 14 months between February 2017 and October 2018. We identified 107 total sleeping sites and analyzed the forest structure at 50 sleeping sites and 50 randomly selected available sites.While the rate of reuse was low and random (N = 15), with sleeping sites characterized by a low availability of large and tall trees, the selection pattern was not random, with sleeping sites occurring more often in familiar areas (i.e., high site fidelity), and those with a greater number of stems and a higher canopy. These sleeping site characteristics were likely selected to decrease detection by predators and facilitate macaque escape in case of attack, supporting the predator avoidance hypothesis. However, food proximity also played a key role in sleeping site selection in this degraded habitat. Macaques often slept within, or close to, their first/last feeding site and selected their sleeping sites following food distribution, presumably to maximize energy intake. Our results present a new impact of habitat degradation on sleeping site selection in large primate groups: the use of a high number of sleeping sites in order to cope with low availability and scattered distribution of fruit resources. [less ▲]

Detailed reference viewed: 46 (4 ULiège)
Full Text
Peer Reviewed
See detailNorthern pigtailed macaques rely on old growth plantations to offset low fruit availability in a degraded forest fragment
Gazagne, Eva ULiege; José‐Domínguez, Juan Manuel; Huynen, Marie-Claude ULiege et al

in American Journal of Primatology (2020)

Space‐use and foraging strategies are important facets to consider in regard to the ecology and conservation of primates. For this study, we documented movement, ranging, and foraging patterns of northern ... [more ▼]

Space‐use and foraging strategies are important facets to consider in regard to the ecology and conservation of primates. For this study, we documented movement, ranging, and foraging patterns of northern pigtailed macaques (Macaca leonina) for 14 months in a degraded habitat with old growth Acacia and Eucalyptus plantations at the Sakaerat Biosphere Reserve in northeastern Thailand. We used hidden Markov models and characteristic hull polygons to analyze these patterns in regard to fruit availability. Macaques' home range (HR) was 599 ha and spanned through a natural dry‐evergreen forest (DEF), and plantation forest. Our results showed that active foraging increased with higher fruit availability in DEF. Macaques changed to a less continuous behavioral state during periods of lower fruit availability in DEF, repeatedly moving from foraging to transiting behavior, while extending their HR further into plantation forest and surrounding edge areas. Concomitantly, macaques shifted their diet from fleshy to dry fruit such as the introduced Acacia species. Our results showed that the diet and movement ecology adaptations of northern pigtailed macaques were largely dependent on availability of native fruits, and reflected a “high‐cost, high‐yield” foraging strategy when fresh food was scarce and dry fruit was available in plantation forest. Conversely, wild‐feeding northern pigtailed macaque populations inhabiting pristine habitat approached a “low‐cost, low‐yield” foraging strategy. Our results outline the effects of habitat degradation on foraging strategies and show how a flexible species can cope with its nutritional requirements. [less ▲]

Detailed reference viewed: 58 (10 ULiège)
Peer Reviewed
See detailBirth control in urban macaques: Description of a tubectomy program and post-op monitoring in Macaca fascicularis, Indonesia
Brotcorne, Fany ULiege; Deleuze, Stefan ULiege; Huynen, Marie-Claude ULiege et al

Conference (2020, February 10)

In Asia, primates and humans are increasingly forced to share space, and often enter in conflict when primates proliferate in anthropogenic environments. Reproductive control is increasingly used to limit ... [more ▼]

In Asia, primates and humans are increasingly forced to share space, and often enter in conflict when primates proliferate in anthropogenic environments. Reproductive control is increasingly used to limit population growth but very few monitoring data are available. Therefore, the efficiency and implications of such programs require a careful examination. Our research aims to assess the adequacy and implications of a three-year sterilization program in wild female long-tailed macaques in Ubud, Bali. We present the rationales behind the selected methods (surgical approach of endoscopic tubectomy and giant trapping cages for captures) and we describe the demographic population model used to establish the objectives of population growth control. We then present the outcomes of this program and the postoperative monitoring results. 137 females underwent tubectomy over four successive campaigns between 2017 and 2019, which represented 45% of the sexually mature females of the population. The survival rate was very high (96%) six months after sterilization and no major postoperative complication were recorded. No novel pregnancy in treated females was observed, reflecting a 100% success rate of the procedure. Moreover, the surgical approach was also applicable for pregnant females since 26% of the treated females were pregnant at the time of the surgery and 77% of them experienced term delivery. Overall, this study case demonstrates the safety and efficiency of tubectomy sterilization as mean of population control in wild macaques. A demographical and behavioural monitoring is currently in progress to provide a global evaluation of the implications of such programs [less ▲]

Detailed reference viewed: 74 (5 ULiège)
Full Text
See detailRenforcement de la population de Tétras lyre en Belgique. Rapport de l’opération de translocation 2019 de 25 Tétras lyres suédois dans la Réserve Naturelle des Hautes Fagnes et suivis de la population fagnarde. rapport final 2019
Delcourt, Johann ULiege; Delvaux, Dylan; Vangeluwe, Didier et al

Report (2019)

Le renforcement de la dernière population de Tétras lyres de Belgique se poursuit pour la troisième année consécutive, grâce aux autorisations délivrées par les autorités suédoises et wallonnes et à ... [more ▼]

Le renforcement de la dernière population de Tétras lyres de Belgique se poursuit pour la troisième année consécutive, grâce aux autorisations délivrées par les autorités suédoises et wallonnes et à l’engagement renouvelé de nos partenaires. Un total de 25 Tétras lyres (10 coqs et 15 poules) capturés en Suède, répartis en 2 lots de captures matinales, ont été transportés et lâchés avec succès du 27 avril au 28 avril 2019 en Fagne wallonne (Réserve Naturelle des Hautes Fagnes, Parc Naturel des Hautes Fagnes, Province de Liège). Treize d’entre eux, 6 coqs et 7 poules, ont été équipés d’émetteurs GPS GSM Ornitela afin de suivre leurs mouvements et leur survie. 4 coqs et 8 poules ont été relâchés sans émetteur. Le rapport détaille ensuite le suivi de l'ensemble de ces individus, ainsi que l'état de la population fagnarde et des individus relâchés les années précédentes. Le rapport fait aussi état d'une excellente reproduction en 2019, confirmé par un comptage automnal. L'état d'avancement du projet d'élevage "Born to be Free" est aussi abordé. [less ▲]

Detailed reference viewed: 62 (6 ULiège)
Full Text
Peer Reviewed
See detailFaire face à une faible disponibilité en fruits dans un habitat dégradé : rôle des plantations chez les macaques à queue de cochon (Macaca leonina) en Thaïlande.
Gazagne, Eva ULiege; José Domínguez, Juan Manuel; Huynen, Marie-Claude ULiege et al

in Revue de Primatologie (2019, October 04)

Space-use patterns and foraging strategies are crucial to understand the ecological resilience of primates in degraded habitats. However, detailed ranging data are scarce, especially for Southeast Asian ... [more ▼]

Space-use patterns and foraging strategies are crucial to understand the ecological resilience of primates in degraded habitats. However, detailed ranging data are scarce, especially for Southeast Asian primate species. Our study examined movement, ranging, and foraging patterns within a group of 141 ± 10 northern pigtailed macaques (Macaca leonina). We followed the macaques and recorded their diet and movements, in regard to fruit availability, within a degraded habitat with reclaimed plantation forest in the Sakaerat Biosphere Reserve, northerneastern Thailand. Using hidden Markov Models (HMMs) and Characteristic Hull Polygons (CHPs), we analyzed these patterns for 14 months in regard of fruit availability. We found that the macaques’ home range of 599 ha covered two types of forest with asynchronous fruit availability, the dry-evergreen forest (DEF) and the plantation forest. During high fruit availability in DEF, macaques were more likely to forage actively in the interior native DEF. By contrast, during low fruit availability in DEF, macaques foraged less in a continuous way and repeatedly moved from a foraging behavior to a transiting one. They also extended their range to plantation forest and edge areas, which resulted in significantly larger monthly home range, core area, longer daily path length, lower site fidelity, as well as faster and more oriented movement. The concomitant macaques’ diet shifted from fleshy to dry fruits such as exotic Acacia species. Our results show that northern pigtailed macaques adapt their movement dynamic, ranging pattern and diet according to fruit availability. They respond primarily to the availability of native fruits, then travel directly toward plantation forest or edge areas with predictable food resources when fruit are scarce. These patterns reflect both energy-maximizing and energy-minimizing strategies and suggest a way used by macaques to cope with habitat degradation. Our study combining ranging pattern analyses with HMMs provides a new and complete picture of movement, ranging and foraging patterns in macaques living in a degraded forest fragment. It contributes to deepen knowledge about the ecology and factors affecting the ranging patterns and resource use of this poorly-known and vulnerable species, a preliminary step to design appropriate conservation strategies. [less ▲]

Detailed reference viewed: 96 (6 ULiège)
Full Text
Peer Reviewed
See detailRôle du statut reproducteur dans le réseau social des femelles chez le macaque à longue queue (Macaca fascicularis)
Giraud, Gwennan ULiege; Larrivaz, Marine; Wandia, Nengah et al

in Revue de Primatologie (2019, October), 10

Detailed reference viewed: 59 (17 ULiège)
Full Text
See detailÉvaluation de la qualité biologique des rivières wallonnes sur base des indices biologiques poissons. Support technique aux inventaires 2019
Dierckx, Arnaud ULiege; Benitez, Jean-Philippe ULiege; Rimbaud, Gilles ULiege et al

Report (2019)

Ce document reprend les informations recueillies dans le cadre d’un travail effectué par l’Université de Liège pour le compte du Service public de Wallonie-DEMNA et financé dans le cadre d’un marché ... [more ▼]

Ce document reprend les informations recueillies dans le cadre d’un travail effectué par l’Université de Liège pour le compte du Service public de Wallonie-DEMNA et financé dans le cadre d’un marché public de services qui a pour objectif l’évaluation de la qualité biologique des eaux de surface basée sur les indices biologiques « poissons » dans onze cours d’eau de Wallonie. [less ▲]

Detailed reference viewed: 64 (4 ULiège)
Full Text
See detailAide au renforcement de la population de Tétras lyre en Belgique. Rapport final année 2018
Delcourt, Johann ULiege; Vangeluwe, Didier; Loneux, Michèle et al

Report (2019)

Un total de 18 Tétras lyres (10 coqs et 8 poules) capturés en Suède, répartis en 4 lots de captures matinales, ont été transportés et lâchés avec succès du 26 avril au 1er mai en Fagne wallonne (Réserve ... [more ▼]

Un total de 18 Tétras lyres (10 coqs et 8 poules) capturés en Suède, répartis en 4 lots de captures matinales, ont été transportés et lâchés avec succès du 26 avril au 1er mai en Fagne wallonne (Réserve Naturelle des Hautes-Fagnes, Parc Naturel des Hautes-Fagnes, Province de Liège). Seize d’entre eux, 8 coqs et 8 poules, sont équipés d’émetteurs GPS GSM de 2 firmes différentes afin de suivre leurs mouvements et leur survie. 2 coqs ont été relâchés sans émetteur. Ce rapport détaille leur devenir et occupation spatiale ainsi que des habitats, mais fait aussi état de la population fagnarde en 2018 et des nouvelles des individus relâchés en 2017. Ce rapport détaille dans un chapitre propre une alternative au renforcement par translocation, la méthode d'élevage "Born to be Free". [less ▲]

Detailed reference viewed: 43 (1 ULiège)
Full Text
Peer Reviewed
See detailIndividual identification and marking techniques for zebrafish
Delcourt, Johann ULiege; Ovidio, Michaël ULiege; Denoël, Mathieu ULiege et al

in Reviews in Fish Biology and Fisheries (2018), 28(4), 839-864

In laboratory fish research, the zebrafish Danio rerio (Cyprinidae) represents the equivalent of the mouse in mammalian research. This species has become a major model for studies in developmental and ... [more ▼]

In laboratory fish research, the zebrafish Danio rerio (Cyprinidae) represents the equivalent of the mouse in mammalian research. This species has become a major model for studies in developmental and behavioural genetics, neurophysiology, biomedicine, ecotoxicology, and behavioural and evolutionary ecology. To meet the need for accurate and reproducible data in both fundamental and applied sciences, it is of primary importance to be able to tag and/or recognize individual zebrafish. However, classic methods used in fish ecology and aquaculture are generally difficult to apply to such small fish. Recently, various new tagging methods have been developed. This paper presents a first review of current identification and marking methods applied to zebrafish, from external observation methods (such as skin pattern recognition, fin clipping, scale regeneration, colour and transgenic methods) to the most advanced technological developments in electronic (low- and high- radio-frequencies PIT tags, microchip) and image analysis methods (video tracking). This review aims to help researchers and zebrafish facility managers select the identification method (ID) best adapted to their needs. The main characteristics of each ID method are examined (including detection range, durability, speed and repetitiveness, ID code combination, size dependence and ethical considerations), and their pros and cons are summarized in a decision table to help select the most appropriate option for a research or management program. Finally, contextual applications of these ID methods and future developments are discussed. [less ▲]

Detailed reference viewed: 249 (77 ULiège)
See detailPhysiological and behavioural responses to habitat fragmentation by black lion tamarins
Kaisin, Olivier ULiege; Culot, Laurence ULiege; Poncin, Pascal ULiege et al

Conference (2018, November 13)

Habitat fragmentation is one of the major threats hanging over primate populations in South America. Before affecting primates at a population level, environmental perturbations affect the physiology of ... [more ▼]

Habitat fragmentation is one of the major threats hanging over primate populations in South America. Before affecting primates at a population level, environmental perturbations affect the physiology of the individuals. Glucocorticoids (GCs), often referred to as stress hormones, are metabolic hormones which mediate the energetic demands needed to overcome predictable and unpredictable environmental and social challenges. These physiological biomarkers play a key role in enabling individuals to respond to stressors and restore physiological homeostasis. How primates adapt to habitat fragmentation pressures remains poorly understood. The aim of this research is to investigate the physiological and behavioural responses of the endangered black lion tamarins (Leontopithecus chrysopygus) living in the Brazilian Atlantic Forest, a habitat particularly affected by fragmentation. The three specific objectives of this research are: (1) reviewing the effect of anthropogenic habitat disturbance on the well-being of primates, (2) analysing variation in chronic stress of tamarins in different forest fragment quality, and (3) relating transient stress levels to behavioural patterns. The first objective will consist of an extensive bibliographic research to identify how habitat disturbance variables affect primate well-being. Regarding physiological markers, we will use two different matrixes to measure GC concentrations. First, GC levels in hair samples (hair cortisol concentrations-HCC) will provide us with information on long term adrenocortical activity, recounting the animal’s chronic stress levels. Second, faecal GC levels will inform us about short term exposure to stress unfolding the animal’s daily fluctuations. Consequently, to approach the second objective, we will compare habitat quality with the HCCs of six tamarin groups living in fragments of different quality. For the third objective, we will compare faecal GC levels with behaviour patterns collected during daily follow-ups of three tamarin groups. This project will be conducted as a joint-PhD between ULiège and the Sao Paulo State University (Brazil). Evaluating stress levels in primate populations living in fragmented landscapes can shed light on how primates respond to such habitat perturbations and how significant it is for their survival. [less ▲]

Detailed reference viewed: 120 (11 ULiège)
Full Text
See detailEvaluation de la qualité biologique des rivières wallonnes sur base des indices biologiques poissons
Dierckx, Arnaud ULiege; Benitez, Jean-Philippe ULiege; Rimbaud, Gilles ULiege et al

Report (2018)

Ce document reprend les informations recueillies dans le cadre d’un travail effectué par l’Université de Liège pour le compte du Service public de Wallonie-DEMNA et financé dans le cadre d’un marché ... [more ▼]

Ce document reprend les informations recueillies dans le cadre d’un travail effectué par l’Université de Liège pour le compte du Service public de Wallonie-DEMNA et financé dans le cadre d’un marché public de services qui a pour objectif l’évaluation de la qualité biologique des eaux de surface basée sur les indices biologiques « poissons » dans seize cours d’eau de Wallonie. [less ▲]

Detailed reference viewed: 98 (14 ULiège)
Peer Reviewed
See detailAnalyser les avantages et inconvénients des stérilisations de primates en milieux anthropisés: une étude de cas des macaques balinais
Brotcorne, Fany ULiege; Broens, Damien ULiege; Delooz, Sophie ULiege et al

Conference (2018, October 18)

Les macaques et les hommes sont aujourd’hui contraints de partager leurs habitats, conduisant souvent à des situations conflictuelles lorsque ces premiers prolifèrent en milieux urbains. Ce phénomène ... [more ▼]

Les macaques et les hommes sont aujourd’hui contraints de partager leurs habitats, conduisant souvent à des situations conflictuelles lorsque ces premiers prolifèrent en milieux urbains. Ce phénomène s’accroit en Asie où certaines espèces survivent et tirent profit des habitats anthropisés et de leurs ressources, alors que d’autres sont en déclin. Récemment, les programmes de contrôle des naissances (via stérilisation permanente ou contraception) se multiplient afin de contrôler l’expansion locale de certaines populations dites « à problème ». Cette approche représente une alternative plus éthique à l’élimination, voire dans certains cas à la translocation. Cependant, les effets et les implications de ces programmes restent largement méconnus. Très peu d’études décrivent la manière dont la stérilité provoquée impacte ou non l’environnement social et le comportement des individus traités, ainsi que de leur groupe. L’objectif de notre recherche est d’investiguer les réponses physiologiques, comportementales et sociales de macaques à longue-queue (Macaca fascicularis) femelles adultes inclues depuis 2017 dans un programme de stérilisation (par ligature des trompes) dans le sanctuaire Monkey Forest Ubud à Bali, en Indonésie. A travers un monitoring éthologique comportemental (basé sur +/- 1000 heures de données focales collectées depuis 2017 via la méthode du focal individuel de 15 minutes combiné à des scans de groupe à intervalle de 5 minutes) et démographique (via comptages mensuels systématiques) à long-terme, nous mesurons le niveau d’activités que les femelles mobilisent au regard de leur condition (stérilisées vs. contrôles) et nous quantifions les indicateurs comportementaux d’anxiété (agressions et comportements autodirigés) afin d’évaluer également les implications des stérilisations en termes de bien-être. Pour cette communication, nous décrirons dans un premier temps le contexte de la population cible (i.e., forte densité démographique, et intensification du conflit humain-macaque et de la tension sociale au sein des groupes de macaques), les objectifs du programme de stérilisation (i.e., taux de croissance visé et modélisation du nombre de femelles à stériliser), et les méthodologies utilisées pour les captures et les stérilisations. Dans un second temps, nous présenterons les résultats préliminaires sur le suivi des femelles stérilisées et les différences éventuelles observées avec les femelles contrôles. Lors la première année qui suit leur stérilisation, les femelles montrent des budgets d’activités globalement similaires aux femelles contrôles. Ce résultat à court-terme s’explique par la technique de stérilisation sélectionnée (i.e., ligature des trompes) qui n’annule pas la production de stéroïdes ovariens, et ainsi n’impacte pas directement le comportement. La seconde étape de nos recherches consiste maintenant à analyser l’évolution du profil comportemental sur le long-terme afin d’évaluer l’impact éventuel des cycles non-féconds répétés et de l’absence permanente de nouveaux jeunes chez les femelles stérilisées. Ces implications seront discutées à travers une analyse des avantages et des inconvénients de ce type de programme. [less ▲]

Detailed reference viewed: 92 (18 ULiège)