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Crayfish as a Model Taxon in Primary and Secondary School
Kostřicová, Zuzana ; Hanel, Lubomír (advisor) ; Andreska, Jan (referee)
This thesis brings a review of the crayfish topic. It aims to be useful for teachers who decide to explore the topic deeper with the class. The theoretical part stars with crayfish seen from the historical and cultural point of view and crayfish as an important source of food for humans. In the following chapters, systematics and global distribution of crayfish is disscused as well as their morphology and anatomy with the aim to highlight facts, that can be used in lessons. After that, six species living in the Czech republic are introduces, all the native species and signal crayfish, spiny-cheek crayfish and marbled crayfish. Than we focus on the position of crayfish in food webs and also on all factors that threaten the populatons of native species: influencing and regulating the riverbeds, competition with invasive species (vectors of crayfish plague), other parasites and pathogenes and also the influence of drought and the climate changes. The last chapter of the theoretical part discusses the different approaches to crayfish protection, repatriation of the native species, but also the approaches which aim to limit the spreading of invasive species including their elimination. In the research part, the content of various biology textbooks was analysed. The aim was to find out how these...
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