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E. Huttinger - One of the best experts on this subject based on the ideXlab platform.
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Utilisation de la méthode capture-marquage-recapture pour une évaluation quantitative des populations de mollusques dans deux sites à Lampsar (Vallée du Fleuve Sénégal)
Bulletin de la Société de pathologie exotique, 2013Co-Authors: D. Massenet, N. Jouanard, E. HuttingerAbstract:The authors have made an estimate of the number of mollusc by the capture-Mark-Recapture Method at two sites in the Valley of the Senegal River. This quantification is necessary to track the effect of the introduction in one of the sites of a native shrimp Machrobrachium vollenhovenii , predator of mollusc. The populations of two study sites were approximately 1,800 and 1,500 individuals with coefficients of variation of about 30%. Les auteurs ont réalisé une estimation du nombre de mollusques par la méthode capture-marquage-recapture dans deux sites de la vallée du fleuve Sénégal. Cette quantification était nécessaire pour effectuer un suivi de l’effet de l’introduction dans un des sites de la crevette autochtone Machrobrachium vollenhovenii , prédateur de mollusques. Les populations des deux sites étudiés étaient d’environ 1800 et 1500 individus avec des coefficients de variation voisins de 30 %.
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Utilisation de la méthode capture-marquage-recapture pour une évaluation quantitative des populations de mollusques dans deux sites à Lampsar (Vallée du Fleuve Sénégal) Using the capture-Mark-Recapture Method for quantitative assessment of population
Bulletin de la Societe de pathologie exotique (1990), 2013Co-Authors: D. Massenet, N. Jouanard, E. HuttingerAbstract:The authors have made an estimate of the number of mollusc by the capture-Mark-Recapture Method at two sites in the Valley of the Senegal River. This quantification is necessary to track the effect of the introduction in one of the sites of a native shrimp Machrobrachium vollenhovenii, predator of mollusc. The populations of two study sites were approximately 1,800 and 1,500 individuals with coefficients of variation of about 30%.
Scott P Schell - One of the best experts on this subject based on the ideXlab platform.
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advances in applied ecological techniques a novel mark recapture technique and its application to monitoring the direction and distance of local movements of rangeland grasshoppers orthoptera acrididae in the context of pest management
Journal of Applied Ecology, 1999Co-Authors: Jeffrey A Lockwood, Scott P SchellAbstract:Summary 1. Rangeland grasshopper movement was studied in Wyoming, USA, with respect to the biological and ecological factors (population density, developmental stage and weather) influencing net displacement and directionality. 2. A novel adaptation of the mark–recapture Method was developed to monitor grasshopper dispersal. The Method used fluorescent powder and resighting marked grasshoppers in the field with ultraviolet light, rather than physical recapturing of individuals. 3. Rangeland grasshoppers exhibited a strong tendency for directional movement. Adult grasshoppers demonstrated a significant tendency for dispersal in a north-westerly direction across a range of population densities (5–8, 10–15 and ≥ 18 grasshoppers m–2). Although not a definitive explanation, weather might have influenced this behaviour, as the grasshoppers consistently moved upwind. 4. The mean displacement of grasshoppers in a 36-h period ranged from 2·3 m in nymphs to 3·7 m in adults, with the distance of displacement being positively correlated with population density. 5. An understanding of grasshopper movement in terms of directionality and displacement has immediate applicability to reduced agent–area treatments for rangeland grasshopper management.
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a novel mark recapture technique and its application to monitoring the direction and distance of local movements of rangeland grasshoppers orthoptera acrididae in the context of pest management
Journal of Applied Ecology, 1999Co-Authors: Jeffrey A Lockwood, Scott P SchellAbstract:1. Rangeland grasshopper movement was studied in Wyoming, USA, with respect to the biological and ecological factors (population density, developmental stage and weather) influencing net displacement and directionality. 2. A novel adaptation of the mark recapture Method was developed to monito grasshopper dispersal. The Method used fluorescent powder and resighting marked grasshoppers in the field with ultraviolet light, rather than physical recapturing of individuals. 3. Rangeland grasshoppers exhibited a strong tendency for directional movement. Adult grasshoppers demonstrated a significant tendency for dispersal in a northwesterly direction across a range of population densities (5-8, 10-15 and ≥ 18 grasshoppers m 2 ). Although not a definitive explanation, weather might have influenced this behaviour, as the grasshoppers consistently moved upwind. 4. The mean displacement of grasshoppers in a 36-h period ranged from 2.3m in nymphs to 3.7m in adults, with the distance of displacement being positively correlated with population density. 5. An understanding of grasshopper movement in terms of directionality and displacement has immediate applicability to reduced agent-area treatments for rangeland grasshopper management.
D. Massenet - One of the best experts on this subject based on the ideXlab platform.
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Utilisation de la méthode capture-marquage-recapture pour une évaluation quantitative des populations de mollusques dans deux sites à Lampsar (Vallée du Fleuve Sénégal)
Bulletin de la Société de pathologie exotique, 2013Co-Authors: D. Massenet, N. Jouanard, E. HuttingerAbstract:The authors have made an estimate of the number of mollusc by the capture-Mark-Recapture Method at two sites in the Valley of the Senegal River. This quantification is necessary to track the effect of the introduction in one of the sites of a native shrimp Machrobrachium vollenhovenii , predator of mollusc. The populations of two study sites were approximately 1,800 and 1,500 individuals with coefficients of variation of about 30%. Les auteurs ont réalisé une estimation du nombre de mollusques par la méthode capture-marquage-recapture dans deux sites de la vallée du fleuve Sénégal. Cette quantification était nécessaire pour effectuer un suivi de l’effet de l’introduction dans un des sites de la crevette autochtone Machrobrachium vollenhovenii , prédateur de mollusques. Les populations des deux sites étudiés étaient d’environ 1800 et 1500 individus avec des coefficients de variation voisins de 30 %.
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Utilisation de la méthode capture-marquage-recapture pour une évaluation quantitative des populations de mollusques dans deux sites à Lampsar (Vallée du Fleuve Sénégal) Using the capture-Mark-Recapture Method for quantitative assessment of population
Bulletin de la Societe de pathologie exotique (1990), 2013Co-Authors: D. Massenet, N. Jouanard, E. HuttingerAbstract:The authors have made an estimate of the number of mollusc by the capture-Mark-Recapture Method at two sites in the Valley of the Senegal River. This quantification is necessary to track the effect of the introduction in one of the sites of a native shrimp Machrobrachium vollenhovenii, predator of mollusc. The populations of two study sites were approximately 1,800 and 1,500 individuals with coefficients of variation of about 30%.
Gerald Louette - One of the best experts on this subject based on the ideXlab platform.
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Combating adult invasive American bullfrog Lithobates catesbeianus
European Journal of Wildlife Research, 2014Co-Authors: Gerald Louette, Sander Devisscher, Tim AdriaensAbstract:American bullfrog Lithobates catesbeianus is considered as one of the world’s worst alien invasive species. Currently, the species is present over almost all continents and is suspected to cause substantial ecological damage. Knowledge about its population density, as well as catchability of the species with commonly used sampling gear, is very useful when considering the development of sound population control programs. Using the multiple Mark-Recapture Method, we investigated the density, sex ratio, and mobility of an adult bullfrog population inhabiting several neighbouring small shallow ponds at the peak of reproduction (mid June–mid July). We estimated the density at 4.3 adults/100 m shore length and the sex ratio (males/females) to 1.64. On average, males and females moved 25 and 83 m, respectively. Catchability of adults, using one double fyke net for 24 h, was rather constant and equalled 0.7 % of the population size. At first sight, this capture technique seems not to generate large-scale adult removal. However, as a companion study revealed that double fyke nets are highly effective for capturing tadpoles, control or even eradication of isolated populations may be enhanced when this proportion of the adult segment is equally removed.
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control of invasive american bullfrog lithobates catesbeianus in small shallow water bodies
European Journal of Wildlife Research, 2013Co-Authors: Gerald Louette, Sander Devisscher, Tim AdriaensAbstract:Setting up cost-efficient control programs for alien invasive species requires the development of adequate removal Methods in combination with insights in population size and dynamics. American bullfrog Lithobates catesbeianus is an alien invasive species, which is suspected to cause substantial ecological damage around the globe. However, control of bullfrog populations is difficult, as no conclusive management measures have yet been determined. We investigated how double fyke nets could contribute to bullfrog management by assessing the tadpole population size in 10 permanent small shallow water bodies. Two population size estimate Methods were applied, being the catch–depletion and mark–recapture Method. Catchability of bullfrog tadpoles proved to be very consistent over ponds and Methods, with one catch per unit of effort (one double fyke net for 24 h) retaining on average 6 % of the tadpole population. Population density varied considerably among ponds, ranging from 950 to 120,804 larger tadpole individuals/ha. Using these insights in developing a cost-efficient eradication program for the species, we projected the number of catch efforts needed to reduce tadpole numbers to a threshold that more than likely affects final bullfrog population size. Predictions indicated that for the specified thresholds the use of eight double fyke nets at a time is most cost-efficient in high abundance populations, while using five double fyke nets seems most suitable in low abundance populations. What the exact threshold number of remaining tadpole individuals should be is uncertain, but forecasts demonstrate that only half of the budget would be needed when aiming at a drop to fewer than 100 remaining tadpoles than when a decrease to fewer than 10 remaining tadpoles is pursued. Given the fairly limited cost of bullfrog management with double fyke nets, however, it may be worthwhile to fully reduce the tadpole population.
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assessment and control of non indigenous brown bullhead ameiurus nebulosus populations using fyke nets in shallow ponds
Journal of Fish Biology, 2006Co-Authors: Gerald Louette, Steven DeclerckAbstract:In order to evaluate fyke nets as a tool for population assessment and mass removal of brown bullhead Ameiurus nebulosus populations, small, shallow ponds were sampled during late summer in 1999 and 2000. Catch efficiency, species and size selectivity of fyke nets were investigated with the Mark-Recapture Method. Two different strategies were applied: (1) on six occasions, the Mark-Recapture Method was applied to entire populations, and (2) in six other cases, sampling was done in two replicated enclosed areas (625 m 2 ). When applied to entire populations, fyke nets were found to be size selective, and capture efficiency significantly increased with standard length. Conversely, no size selectivity of fyke nets was found in enclosed areas. Sampling in replicated enclosures yielded reproducible estimates of population density and biomass. The results suggest that double fyke nets, when combined with the Mark-Recapture technique, are a very useful tool for the efficient and reliable assessment of brown bullhead populations. The results of the study also suggest that double fyke nets may potentially be a cost-effective tool for the mass removal of non-indigenous brown bullhead populations.
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Assessment and control of non‐indigenous brown bullhead Ameiurus nebulosus populations using fyke nets in shallow ponds
Journal of Fish Biology, 2006Co-Authors: Gerald Louette, Steven DeclerckAbstract:In order to evaluate fyke nets as a tool for population assessment and mass removal of brown bullhead Ameiurus nebulosus populations, small, shallow ponds were sampled during late summer in 1999 and 2000. Catch efficiency, species and size selectivity of fyke nets were investigated with the Mark-Recapture Method. Two different strategies were applied: (1) on six occasions, the Mark-Recapture Method was applied to entire populations, and (2) in six other cases, sampling was done in two replicated enclosed areas (625 m 2 ). When applied to entire populations, fyke nets were found to be size selective, and capture efficiency significantly increased with standard length. Conversely, no size selectivity of fyke nets was found in enclosed areas. Sampling in replicated enclosures yielded reproducible estimates of population density and biomass. The results suggest that double fyke nets, when combined with the Mark-Recapture technique, are a very useful tool for the efficient and reliable assessment of brown bullhead populations. The results of the study also suggest that double fyke nets may potentially be a cost-effective tool for the mass removal of non-indigenous brown bullhead populations.
N. Jouanard - One of the best experts on this subject based on the ideXlab platform.
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Utilisation de la méthode capture-marquage-recapture pour une évaluation quantitative des populations de mollusques dans deux sites à Lampsar (Vallée du Fleuve Sénégal)
Bulletin de la Société de pathologie exotique, 2013Co-Authors: D. Massenet, N. Jouanard, E. HuttingerAbstract:The authors have made an estimate of the number of mollusc by the capture-Mark-Recapture Method at two sites in the Valley of the Senegal River. This quantification is necessary to track the effect of the introduction in one of the sites of a native shrimp Machrobrachium vollenhovenii , predator of mollusc. The populations of two study sites were approximately 1,800 and 1,500 individuals with coefficients of variation of about 30%. Les auteurs ont réalisé une estimation du nombre de mollusques par la méthode capture-marquage-recapture dans deux sites de la vallée du fleuve Sénégal. Cette quantification était nécessaire pour effectuer un suivi de l’effet de l’introduction dans un des sites de la crevette autochtone Machrobrachium vollenhovenii , prédateur de mollusques. Les populations des deux sites étudiés étaient d’environ 1800 et 1500 individus avec des coefficients de variation voisins de 30 %.
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Utilisation de la méthode capture-marquage-recapture pour une évaluation quantitative des populations de mollusques dans deux sites à Lampsar (Vallée du Fleuve Sénégal) Using the capture-Mark-Recapture Method for quantitative assessment of population
Bulletin de la Societe de pathologie exotique (1990), 2013Co-Authors: D. Massenet, N. Jouanard, E. HuttingerAbstract:The authors have made an estimate of the number of mollusc by the capture-Mark-Recapture Method at two sites in the Valley of the Senegal River. This quantification is necessary to track the effect of the introduction in one of the sites of a native shrimp Machrobrachium vollenhovenii, predator of mollusc. The populations of two study sites were approximately 1,800 and 1,500 individuals with coefficients of variation of about 30%.