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21 results on '"Van Laere, Guy"'

17. Antler size provides an honest signal of male phenotypic quality in roe deer

Author

Vanpe, Cecile, Gaillard, Jean-Michel, Kjellander, Petter, Mysterud, Atle, Magnien, Pauline, Delorme, Daniel, Van Laere, Guy, Klein, Francois, Liberg, Olof, and Hewison, A.J. Mark

Subjects
Antlers -- Physiological aspects, Antlers -- Usage, Courtship of animals -- Physiological aspects, Biological sciences, Earth sciences
Published
2007

18. Heterozygosity-fitness correlations revealed by neutral and candidate gene markers in roe deer from a long-term study

Author

Da Silva, Anne, Gaillard, Jean-Michel, Yoccoz, Nigel G., Hewison, A.J. Mark, Galan, Max, Coulson, Tim, Allaine, Dominique, Vial, Laurence, Delorme, Daniel, Van Laere, Guy, Klein, Francois, and Luikart, Gordon

Subjects
Population genetics -- Research, Genetic markers -- Usage, Biological diversity -- Research, Biological sciences
Abstract

The heterozygosity-fitness correlations (HFCs) in a population of roe deer (Capreolus capreolus) are monitored intensively to assess the relationship between juvenile survival, a reliable proxy for individual fitness among studied roe deer population and genetic diversity. The results from both neutral and candidate gene markers suggested that the observed HFCs are likely due to linkage with dominant or overdominant loci that affect fitness rather than to a genome-wide relationship with homozygosity due to inbreeding.

Published
2009

19. Dénombrer les populations de chevreuils par l’utilisation du line transect. Étude de faisabilité

Author

Gaillard, Jean-michel, Boutin, Jean-Marie, and Van laere, Guy

Subjects
Ecology, Evolution, Behavior and Systematics
Abstract

Determining the size of roe deer populations is a difficult task. The methods required have (1) to provide estimates with confidence intervals and (2) be flexible enough to take into account specific features of the species. As line transect sampling fits these requirements, the method was tested on roe deer in the Chizé forest, whose population was of known size, and decreasing. First, the theory and definitions of line transect sampling are presented. Then, assumptions and models are briefly reviewed. A sampling design f or roe deer is proposed which satisfies critical assumptions. Lastly, a feasibility test is performed. Population sizes are estimated from line transect sampling during 2 years with different population sizes, using the program TRANSECT. Our population estimates highlight the decrease in population size from 1987 to 1989. However, confidence intervals are very large because too few contacts were made during our sampling (36 in 1987 ; 16 in 1989). To count roe deer using line transect could be difficult when population density is low and/or spread over large areas. Nonetheless, the line transect could be a powerful tool to indicate trends in forest roe deer population size when density is higher than 10/100 ha., Plus d’expérimentations sur le terrain sont encore requises pour savoir si une généralisation de cette méthode à des fins de gestion du Chevreuil est possible. Cette première étude sur une population dont les variations d’effectifs sont connues montre que la faisabilité est importante pour les populations à forte densité (supérieure à 10/100 ha) et que lorsque les conditions d’application d’une méthode bien éprouvée sur le plan théorique de l’estimation sont intégrées dans le protocole expérimental, le modèle aboutit à une évaluation correcte de l’effectif de population (Badia & Gaillard, 1992). La précision dépend ensuite de nombreux facteurs tels que l’intensité d’échantillonnage ou la distribution spatiale des individus dont les effets devront être quantifiés dans des études ultérieures., Gaillard Jean-michel,Boutin Jean-Marie,Van laere Guy. Dénombrer les populations de chevreuils par l’utilisation du line transect. Étude de faisabilité. In: Revue d'Écologie (La Terre et La Vie), tome 48, n°1, 1993. pp. 73-85.

Published
1993
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21. Eruption patterns of permanent front teeth as an indicator of performance in roe deer.

Author

Garel, Mathieu, Gaillard, Jean-Michel, Delorme, Daniel, and Van Laere, Guy

Subjects
*ROE deer, *VERTEBRATES, *DENTITION, *POPULATION, *INCISORS, *ANIMAL population density
Abstract

In most species of vertebrates, teeth play a central role in the long-term performance of individuals. However, patterns of tooth development have been little investigated as an indicator of animal performance. We filled this gap using data collected during long-term capture-mark-recapture monitoring of 1152 roe deer fawns at Chizé, western France. This population fluctuated greatly in size during the 27 years of monitoring, offering a unique opportunity to assess how the eruption patterns of front teeth perform as indicator of animal performance. We used three indices of the eruption of permanent front teeth, the simplest being whether or not incisor I2 has erupted, and the most complex being a 12-level factor distinguishing the different stages of tooth eruption. We also assessed the relevance of these indices as compared to fawn body mass, a widely used indicator of animal performance of deer populations. Dental indices and body mass were positively correlated (all r > 0.62). Similarly to body mass, all indices based on tooth eruption patterns responded to changes of population size and can be reliably used to assess the relationship between roe deer and their environment. We found a linear decrease in body mass with increasing population size (r² = 0.54) and a simultaneous delay in tooth development (r² = 0.48-0.55 from the least to the most accurate indicator). However, tooth development would be not further delayed in years with the highest densities (>15 adult roe deer/100 ha). A path analysis supported the population density effect on tooth eruption patterns being mainly determined by the effect of population size on body mass. Our study provides managers with simple indices (e.g., presence-absence of I2) that provide a technically more easy way to standardize measurements of deer density-dependent responses over large geographical and temporal scales than would be possible with body mass. [ABSTRACT FROM AUTHOR]

Published
2014
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