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The trophic ecology of Sargasso Sea fishes
Horák, Mikuláš ; Horká, Petra (advisor) ; Frouzová, Jaroslava (referee)
This work aims to create a comprehensive overview of current knowledge about trophic relationships within and among fish communities in the ecosystems of the Sargasso Sea and tries to deepen our understanding of the intricate trophic dynamics in these waters and contribute to the broader field of marine ecology. The Sargasso Sea is a unique marine environment characterized by its lack of continental boundaries, with its relative limits defined by major ocean currents. The main objective of this thesis is to consolidate the current research on feeding ecology of fish in the oligotrophic sea waters, with a focus on describing the food webs and species composition of pelagic organisms, along with their interrelationships. To comprehend and illuminate these interactions, various pre-existing data obtained through stable isotope analysis (15 N and 13 C) are employed to determine food web structure and trophic positions. Fluctuations in these values within food webs may provide insights into both natural and anthropogenic influences. Key words: The Sargasso sea, feeding ecology, trophic interactions, food web, stable isotopes
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