Kvantitativní tvarová analýza rozsivkových frustul: asymetrie, allometrie a struktura tvaroprostorů

Woodard, Kateřina

This thesis is focused on geometric morphometrics of allometric and asymmetric variation in frustule shape of raphid pennate diatoms. While pronounced shape changes of diatom frustules related to their size reduction were many times reflected in diatom research, formal quantitative evaluation of these patterns has been rarely attempted. My thesis used semilandmark based geometric morphometrics of frustule outlines in analyses of morphological phenomena related to size reduction throughout mitotic phase of the life cycle, such as allometry, symmetry of frustules and their asymmetric deviations. The analyses showed that morphological allometry represents the dominant element of shape variation in several naviculoid species, such as Luticola poulickovae, Navicula cryptocephala, Sellaphora pupula. Shape changes during size reduction throughout the vegetative part of these taxa mostly involved a simultaneous increase in circularity of valve outlines and disparity among cells. On the other hand, asymmetry of valves proved to be unrelated to size changes within populations. However, the morphometric analyses of Luticola poulickovae revealed that there was a subtle but significant side-oriented asymmetry of valve outlines that is related to the position of the primary and secondary valve sides. In...

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