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Diversity and distribution of scorpions (Arahnida: Scorpiones)
Plíšková, Jana ; Šťáhlavský, František (advisor) ; Kůrka, Antonín (referee)
This thesis is devoted to species diversity and biogeography of Scorpiones order. Bachelor work is presenting basic problems of this area and major split in higher classification of scorpions, which is still not firmly defined. In the work is also provided an overview of the current 15 families, to whom is the scorpions order divided by classification proposed by Soleglad & Fet (2003), including their distribution, the number of families and species they cover. Factors which had or still have an impact on the expansion of scorpions are also discussed. Described factors, which affects the distribution and diversity of scorpions, are: continental drift and Quaternary climate change (historical aspects) and temperature, parthenogenesis and human factor (environmental aspects). These factors influenced the biogeography of scorpions at different taxonomic levels, in different evolution time scale and on differently sized territories.
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Karyotype evolution of the subgenus Euscorpius (Alpiscorpius) in Alps
Plíšková, Jana ; Šťáhlavský, František (advisor) ; Kratochvíl, Lukáš (referee)
High mountain systems are important areas for divergence and speciation. These topographically diverse structures have strongly influenced the evolution of mountain biota. Alps, as the largest European high mountain system, form a major feature in moulding the phylogeography of many species and they are specific in a high number of endemic species. Scorpions are generally well known mainly as inhabitants of arid and semi-arid areas but some of them also contribute an important element of mountain biota in which is the case of subgenus Alpiscorpius within European genus Euscorpius. Three endemic cryptic species have been recognised from Alpine mountain system, these are E.(A.) alpha, E.(A.) germanus and E.(A.) gamma at this moment. They were elevated to species rank about 15 years ago as a result of pilot molecular phylogenetic studies using molecular markers, mitochondrial 16S rDNA and nuclear allozymes. I examined these species from 35 different alpine populations using cytogenetic methods and detected unsuspected great karyotype variability among them. In E. (A.) alpha there was reported occurrence of three distinct karyotypic races (2n=60, 90, 54). Similarly, within species E. (A.) gamma there was found existence of two highly different karyotypic races (2n=58; 88). Interestingly, among...
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Diversity and distribution of scorpions (Arahnida: Scorpiones)
Plíšková, Jana ; Šťáhlavský, František (advisor) ; Kůrka, Antonín (referee)
This thesis is devoted to species diversity and biogeography of Scorpiones order. Bachelor work is presenting basic problems of this area and major split in higher classification of scorpions, which is still not firmly defined. In the work is also provided an overview of the current 15 families, to whom is the scorpions order divided by classification proposed by Soleglad & Fet (2003), including their distribution, the number of families and species they cover. Factors which had or still have an impact on the expansion of scorpions are also discussed. Described factors, which affects the distribution and diversity of scorpions, are: continental drift and Quaternary climate change (historical aspects) and temperature, parthenogenesis and human factor (environmental aspects). These factors influenced the biogeography of scorpions at different taxonomic levels, in different evolution time scale and on differently sized territories.
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