The Experts below are selected from a list of 32103 Experts worldwide ranked by ideXlab platform
A Van Der Meijden - One of the best experts on this subject based on the ideXlab platform.
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phylogeographic patterns of buthus scorpions scorpiones buthidae in the Maghreb and south western europe based on co1 mtdna sequences
Journal of Zoology, 2012Co-Authors: Pedro Sousa, David James Harris, Elsa Froufe, A Van Der MeijdenAbstract:The genus Buthus is a medium diverse scorpion genus, with 35 species distributed from Portugal and Morocco ranging eastward to Yemen in the Arabic Peninsula. The bulk of the genus’ known species diversity occurs in the Western Mediterranean area. A recent molecular study started to elucidate the patterns of diversity of this genus in the Iberian Peninsula and the Maghreb. Since then, the taxonomy of the genus has changed substantially, with several new species having been described, and with the elevation of former subspecies to species-level. In this study, we assessed the patterns of diversity of Buthus scorpions from across the Maghreb region of North Africa using CO1 DNA sequence data. Based on our dataset of 147 sequences, including 67 new sequences, we recovered four wellsupported deep clades within Buthus scorpions from the Maghreb and Southern Europe. This further strengthens the support for cryptic diversity in the Maghreb region. The broader sampling of the Maghreb permitted a better understanding of the phylogeographic structure in this area. Three clades were restricted to Morocco and appear to have originated at the Atlantic Coast of this country, while the fourth was found throughout the region. We propose a model with two colonizing events to explain the distribution patterns across the Strait of Gibraltar, with an initial colonization from North Africa to Iberia followed by a reinvasion of the Rif Mountains region in Morocco.
Pedro Sousa - One of the best experts on this subject based on the ideXlab platform.
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phylogeographic patterns of buthus scorpions scorpiones buthidae in the Maghreb and south western europe based on co1 mtdna sequences
Journal of Zoology, 2012Co-Authors: Pedro Sousa, David James Harris, Elsa Froufe, A Van Der MeijdenAbstract:The genus Buthus is a medium diverse scorpion genus, with 35 species distributed from Portugal and Morocco ranging eastward to Yemen in the Arabic Peninsula. The bulk of the genus’ known species diversity occurs in the Western Mediterranean area. A recent molecular study started to elucidate the patterns of diversity of this genus in the Iberian Peninsula and the Maghreb. Since then, the taxonomy of the genus has changed substantially, with several new species having been described, and with the elevation of former subspecies to species-level. In this study, we assessed the patterns of diversity of Buthus scorpions from across the Maghreb region of North Africa using CO1 DNA sequence data. Based on our dataset of 147 sequences, including 67 new sequences, we recovered four wellsupported deep clades within Buthus scorpions from the Maghreb and Southern Europe. This further strengthens the support for cryptic diversity in the Maghreb region. The broader sampling of the Maghreb permitted a better understanding of the phylogeographic structure in this area. Three clades were restricted to Morocco and appear to have originated at the Atlantic Coast of this country, while the fourth was found throughout the region. We propose a model with two colonizing events to explain the distribution patterns across the Strait of Gibraltar, with an initial colonization from North Africa to Iberia followed by a reinvasion of the Rif Mountains region in Morocco.
Kamel Smaïli - One of the best experts on this subject based on the ideXlab platform.
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Script Independent Morphological Segmentation for Arabic Maghrebi Dialects: An Application to Machine Translation
Computación y sistemas, 2019Co-Authors: Salima Harrat, Karima Meftouh, Kamel SmaïliAbstract:This research deals with resources creation for under-resourced languages. We try to adapt existing resources for other resourced-languages to process less-resourced ones. We focus on Arabic dialects of the Maghreb, namely Algerian, Moroccan and Tunisian. We first adapt a well-known statistical word segmenter to segment Algerian dialect texts written in both Arabic and Latin scripts. We demonstrate that unsupervised morphological segmentation could be applied to Arabic dialects regardless of used script. Next, we use this kind of segmentation to improve statistical machine translation scores between the tree Maghrebi dialects and French. We use a parallel multidialectal corpus that includes six Arabic dialects in addition to MSA and French. We achieved interesting results. Regards to word segmentation, the rate of correctly segmented words reached 70% for those written in Latin script and 79% for those written in Arabic script. For machine translation, the unsupervised morphological segmentation helped to decrease out-of-vocabulary words rates by a minimum of 35%.
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Maghrebi Arabic dialect processing: an overview
Journal of International Science and General Applications, 2018Co-Authors: Salima Harrat, Karima Meftouh, Kamel SmaïliAbstract:Natural Language Processing for Arabic dialects has grown widely these last years. Indeed, several works were proposed dealing with all aspects of Natural Language Processing. However, some AD varieties have received more attention and have a growing collection of resources. Others varieties, such as Maghrebi, still lag behind in that respect. Maghrebi Arabic is the family of Arabic dialects spoken in the Maghreb region (principally Algeria, Tunisia and Morocco). In this work we are interested in these three languages. This paper presents a review of natural language processing for Maghrebi Arabic dialects.
Smaïli Kamel - One of the best experts on this subject based on the ideXlab platform.
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Script Independent Morphological Segmentation for Arabic Maghrebi Dialects: An Application to Machine Translation
'Instituto Politecnico Nacional Centro de Investigacion en Computacion', 2019Co-Authors: Harrat Salima, Meftouh Karima, Smaïli KamelAbstract:International audienceThis research deals with resources creation for under-resourced languages. We try to adapt existing resources for other resourced-languages to process less-resourced ones. We focus on Arabic dialects of the Maghreb, namely Algerian, Moroccan and Tunisian. We first adapt a well-known statistical word segmenter to segment Algerian dialect texts written in both Arabic and Latin scripts. We demonstrate that unsupervised morphological segmentation could be applied to Arabic dialects regardless of used script. Next, we use this kind of segmentation to improve statistical machine translation scores between the tree Maghrebi dialects and French. We use a parallel multidialectal corpus that includes six Arabic dialects in addition to MSA and French. We achieved interesting results. Regards to word segmentation, the rate of correctly segmented words reached 70% for those written in Latin script and 79% for those written in Arabic script. For machine translation, the unsupervised morphological segmentation helped to decrease out-of-vocabulary words rates by a minimum of 35%
David James Harris - One of the best experts on this subject based on the ideXlab platform.
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phylogeographic patterns of buthus scorpions scorpiones buthidae in the Maghreb and south western europe based on co1 mtdna sequences
Journal of Zoology, 2012Co-Authors: Pedro Sousa, David James Harris, Elsa Froufe, A Van Der MeijdenAbstract:The genus Buthus is a medium diverse scorpion genus, with 35 species distributed from Portugal and Morocco ranging eastward to Yemen in the Arabic Peninsula. The bulk of the genus’ known species diversity occurs in the Western Mediterranean area. A recent molecular study started to elucidate the patterns of diversity of this genus in the Iberian Peninsula and the Maghreb. Since then, the taxonomy of the genus has changed substantially, with several new species having been described, and with the elevation of former subspecies to species-level. In this study, we assessed the patterns of diversity of Buthus scorpions from across the Maghreb region of North Africa using CO1 DNA sequence data. Based on our dataset of 147 sequences, including 67 new sequences, we recovered four wellsupported deep clades within Buthus scorpions from the Maghreb and Southern Europe. This further strengthens the support for cryptic diversity in the Maghreb region. The broader sampling of the Maghreb permitted a better understanding of the phylogeographic structure in this area. Three clades were restricted to Morocco and appear to have originated at the Atlantic Coast of this country, while the fourth was found throughout the region. We propose a model with two colonizing events to explain the distribution patterns across the Strait of Gibraltar, with an initial colonization from North Africa to Iberia followed by a reinvasion of the Rif Mountains region in Morocco.
