I cannot create a summary of the requested article because the available search results do not include the full text of the article from Science, Volume 391, Number 6792, dated March 2026. From the available sources, I only have a brief description of the cover of the issue, which mentions research on bison in Yellowstone and their effect on the nitrogen cycle[1], but that is not the full article necessary to create a detailed summary according to your requirements. To create an accurate and factual summary in Slovak, I would need access to the full text of the article from the mentioned issue of Science.