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Investigating Trophic Interactions Of Deep-Sea Animals (Sharks, Teleosts, And Mobile Scavengers) In The Gulf Of Mexico Using Stable Isotope Analysis, Diana A. Churchill
Investigating Trophic Interactions Of Deep-Sea Animals (Sharks, Teleosts, And Mobile Scavengers) In The Gulf Of Mexico Using Stable Isotope Analysis, Diana A. Churchill
FIU Electronic Theses and Dissertations
The deep-sea is the largest habitat on earth, containing over 90 percent of the world’s oceans and home to over 20,000 species. Deep-sea ecosystems are increasingly impacted by human activities including fishing and oil extraction. To understand potential impacts on deep-sea food webs, it is crucial to gather baseline data in these systems. I quantified the trophic interactions of three groups of deep-water animals across a range of trophic levels living in the northern and eastern Gulf of Mexico using stable isotope analysis. First, I propose methods for correcting δ15N values for the presence of nitrogenous metabolic waste …
Cold Season Physiology Of Arctic Plants, Jonathan G. Moser
Cold Season Physiology Of Arctic Plants, Jonathan G. Moser
FIU Electronic Theses and Dissertations
The cold season in the Arctic extends over eight to nine months during which ecosystem gas exchange and water balance of arctic plants have been largely unexplored. The overall objective of this thesis was to examine two critical gaps in our knowledge about tundra cold season processes – ecosystem respiration at very low temperatures and water uptake during the winter-spring transition. I determined the temperature response of ecosystem respiration of tundra monoliths down to temperatures as low as can be expected under snow-covered conditions (-15 °C). Temperature responses fit the Arrhenius function well with Q10 values over the range …