Penguin seal carbon dating
THE PRESENCE OF mummified seal carcases in both glaciated and ice-free regions of Mc Murdo Sound was first reported by early British expeditions (Scott, 1905; Wilson, 1907). The greater part of Victoria Land is completely glacierized; major glaciers flow eastwards from the inland ice plateau through the coastal ranges to the Ross Sea.Dead crabeater seals (Lobodon carcinophagus) were found as much as 35 miles inland on the surface of a glacier more than 3000 feet above sea level. Extensive névé fields in the coastal ranges feed alpine glaciers which flow to join the main valley glaciers.Working with a larger group of both natural and social scientists, we are using bulk and compound-specific stable isotope analysis determine: 1) the relative use of mangroves habitats and carbon derived from mangroves versus other estuarine and near-shore habitats by adult fish and crustaceans targeted by subsistence and commercial fishers, and 2) the ontogenetic movements and use of mangrove habitats by juvenile fish that are subsequently targeted by subsistence and commercial fishers when they move outside of mangrove habitats as adults.Our results will be integrated into larger studies of ecosystem services to help inform mangrove policies that benefit communities facing climate change and coastal habitat loss.
These techniques can also be applied to fossil material when preservation of bone and other tissues is sufficient.
A key species in the Antarctic marine ecosystem is Antarctic krill, which in addition to being commercially harvested, is the principle prey of a wide range of marine organisms including penguins, seals and whales.
The aim of this study is to use penguins and other krill predators as sensitive indicators of the Antarctic marine food web.
Impact of the Deep Water Horizon Oil Spill on Coastal Food Webs We are using compound-specific stable isotopic analysis of amino acids to assess how trophic structure and carbon flow in marsh food-webs were impacted by the Deep Water Horizon oil spill.
Using archived and newly collected samples we are comparing trophic structure and primary producer contributions to marine and terrestrial food-webs in oiled and unoiled marshes to understand how these ecosystems respond during the recovery process.