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91.
Samer Alasaad Joerns Fickel Luca Rossi Mathieu Sarasa Buenaventura Ben?-tez-Camacho José E Granados Ramón C Soriguer 《Acta veterinaria Scandinavica》2012,54(1):56
Background
Hybridization between closely related wild and domestic species is of great concern because it can alter the evolutionary integrity of the affected populations. The high allelic variability of Major Histocompatibility Complex (MHC) loci usually excludes them from being used in studies to detect hybridization events. However, if a) the parental species don’t share alleles, and b) one of the parental species possesses an exceptionally low number of alleles (to facilitate analysis), then even MHC loci have the potential to detect hybrids.Results
By genotyping the exon2 of the MHC class II DRB1 locus, we were able to detect hybridization between domestic goats (Capra hircus) and free-ranging Iberian ibex (Capra pyrenaica hispanica) by molecular means.Conclusions
This is the first documentation of a Capra pyrenaica × Capra hircus hybridization, which presented us the opportunity to test the applicability of MHC loci as new, simple, cost-effective, and time-saving approach to detect hybridization between wild species and their domesticated relatives, thus adding value to MHC genes role in animal conservation and management. 相似文献92.
Geneviève Lejeune Chhun-Huor Ung Mathieu Fortin Xiao Jing Guo Marie-Claude Lambert Jean-Claude Ruel 《European Journal of Forest Research》2009,128(5):505-513
We simplified Kozak’s taper model by setting the inflection point at 1.3 m (dbh) without losing accuracy and precision. The
simplification was required to facilitate the estimation of the covariance parameters when using a mixed-effects method. This
method was necessary to take into account the correlation among multiple diameter measurements on an individual stem. The
simple stem taper model was fitted to an extended data set collected across the province of Quebec, Canada. Comparison of
the predicted stem taper and the derived stem volume with those obtained using existing models showed a comparable predictive
power for the simple model. Including a prediction of the tree random effects based on supplementary diameter measurements
of the bole improves the predictive ability of the model around the extra diameter observation. This model offers welcome
simplicity as a means of predicting tree taper at coarse resolution for planning tree harvesting. 相似文献
93.
Mathieu Fortin Steve Bédard Josianne DeBlois Sébastien Meunier 《Annals of Forest Science》2008,65(2):205-205
This study proposes a generalized linear mixed model to predict individual tree mortality in northern hardwood stands under uneven-aged management. The model is based on a complementary log-log (CLL) link function, and was calibrated using permanent-plot data. Tree vigor, stem product, diameter at breast height and stand basal area were tested as explanatory variables. A plot and an interval random effect were specified to account for spatial correlations. When compared with the traditional logit link function, the CLL facilitates the inclusion of the time factor. In this case study, there was an important variability of mortality predictions between the plots and the intervals for a given plot. The interval random effect is thought to be associated with catastrophic mortality. Since both tree vigor and stem product proved to be significant mortality predictors, we recommend that these variables be evaluated to increase the accuracy of mortality models. 相似文献
94.
Véronique Chable Mathieu Conseil Estelle Serpolay François Le Lagadec 《Euphytica》2008,164(2):521-529
Plant breeding for organic agriculture (OA) was stimulated when it came under the European Organic Agriculture Regulation
(2092/91) in 2004. In Brittany, the need for specific varieties for organic farming arose early for the Brassica species because of the unsuitability of most of the modern varieties to the principles of OA. Moreover, the private sector
of plant breeding finds it economically difficult to satisfy the demands of OA. The aim of the present study is to provide
varieties and seed for organic farmers for two vegetable Brassica crops, and to show how genetic resources can contribute to this purpose in the framework of a Participatory Plant Breeding
(PPB) programme. The emergence of PPB in Brittany is the result of several concomitant and favourable circumstances: the will
of the professionals (represented by IBB, Inter Bio Bretagne), their organization (an experimental station, the PAIS, Plateforme
Agrobiologique d’IBB à Suscinio), the research initiative in INRA and the availability of genetic resources. From genetic
resource observations, our experience showed several breeding situations: reviving a traditional activity (Roscoff cauliflower
and local cabbages), extending tradition (autumn cauliflower), diversifying production by new introductions (coloured cauliflowers),
and creating new forms of population varieties (broccoli and coloured cauliflowers). Farmers have taken charge of population
breeding by mass selection and the PAIS, with INRA scientific support, has taken up innovative selection and the improvement
of varieties completing the farmers’ initiatives. The PAIS remained the central point for information and for providing the
seed for trials. Seed production will be managed in a collective way. Until now, the exchange of seed remained an experimental
dimension of PPB. French seed legislation represents a limitation on the development of seed exchange by PPB. 相似文献
95.
V. Brault C. Lévy-Leduc A. Mathieu A. Jullien 《Journal of Agricultural, Biological & Environmental Statistics》2018,23(3):374-389
In this paper, we address the change-point estimation issue in multivariate observations which consist in functions having piecewise constant first derivatives corrupted by some additional noise. We propose to solve this problem by rewriting it as a variable selection issue in a sparse multivariate linear model. Moreover, the methodology that we propose takes into account the dependence that may exist within the multivariate observations. Then, the performance of our approach is assessed through some numerical experiments and compared to other alternative and classical methods. Finally, we apply our methodology to experimental data in order to study the vegetative development of oilseed rape. The evolution of the number of leaves of oilseed rape can be modeled as a function having piecewise constant first derivatives corrupted by some additional noise where the change-points correspond to key times in the plant phenology. Our novel estimation method increases the accuracy of the change-point estimation in comparison with classical approaches. Moreover, we show that the parameters of the covariance matrix depend on the level of competition between plants. Supplementary materials accompanying this paper appear online. 相似文献
96.
97.
An 8‐day‐old French trotter colt was admitted with a traumatic lateral abdominal wall hernia with reducible intestinal content. A 15 cm long full thickness tear was identified in both the internal abdominal oblique and transverse abdominal muscles. This case report describes the surgical repair of the hernia using a polypropylene mesh. 相似文献
98.
Charlotte Baey Amélie Mathieu Alexandra Jullien Samis Trevezas Paul-Henry Cournède 《Journal of Agricultural, Biological & Environmental Statistics》2018,23(2):208-232
Modeling inter-individual variability in plant populations is a key issue to understand crop heterogeneity and its variations in response to the environment. Being able to describe the interactions among plants and explain the variability observed in the population could provide useful information on how to control it and improve global plant growth. We propose here a method to model plant variability within a field, by extending the so-called GreenLab functional-structural plant model from the individual to the population scale via nonlinear mixed-effects modeling. Parameter estimation of the population model is achieved using the stochastic approximation expectation maximization algorithm, implemented in the platform for plant growth modeling and analysis PyGMAlion. The method is first applied on a set of simulated data and then on a real dataset from a population of 34 winter oilseed rape plants at the rosette stage. Results show that our method allows for a good characterization of the variability in the population with only a limited number of parameters, which is a key point for plant models. Results on simulated data show that parameters associated with a low sensitivity index are inaccurately estimated by the algorithm when considered as random effects, but a good stability of the results can be obtained by considering them as fixed effects. These results open new ways for the analysis of inter-plant variability within a population and the study of plant–plant competition.Supplementary materials accompanying this paper appear online. 相似文献
99.
100.
Mathieu Raillard Julien Michaut-Castrillo Damien Spreux Olivier Gauthier Gwenola Touzot-Jourde Delphine Holopherne-Doran 《Veterinary anaesthesia and analgesia》2017,44(1):17-27