| Abstract [eng] |
The aim of the dissertation is to assess the ecological dynamics of ostracods during the Mulde/lundgreni bioevent (Wenlock, Silurian). This study provides results on the impact of the bioevent on ostracods in the context of other Silurian bioevents and ecological trends. The research contributed to a better understanding of ocean ecosystem dynamics, systemic transitions in paleocommunities, and expanded knowledge of the short-term (up to ~2 Mya) bioevents, as well as the role of ostracods in the ecosystem, highlighted the importance of resolution in research. The study revealed that changes in ostracod diversity are related to sea-level fluctuations driven by long-term (405 Kyr) and short-term (100–120 Kyr) Milankovitch eccentricity cycles. An analysis of local species diversity showed that the bioevent had a strong but short-lived impact on ostracod a-diversity. Taxonomic variability in ostracod assemblages confirms that the Mulde/lundgreni bioevent had a strong effect on benthic fauna, occurring only during the peak stress phase of the bioevent. Quantitative analyses confirmed that during the Mulde/lundgreni bioevent, there was a rapid transition from less stable to more stable ostracod communities. A comparison of ostracod species composition before and after the bioevent indicates that while the species composition remained generally stable throughout the studied time interval, it was interrupted by a relatively abrupt episode of change lasting tens of thousands of years. |
