Marine Science

Marine Science

Senior Theses 2006

Danielle Greenhow (2006). Seas In-situ Spectrophotometric Phosphate Profiling in the Gulf of Mexico
Facility Advisor: David Hastings


In oligotrophic waters, biogeochemical cycling exerts a dominant influence on phosphate concentrations within the euphotic zone. Due to extensive nutrient scavenging by phytoplankton in the upper water column, near-surface phosphate concentrations are often lower than the detection limits of traditional analytical techniques. Conventional discrete sampling methods result in nutrient profiles that are limited to an average of twelve points spanning the upper 100 meters. The spectrophotometric elemental analysis system (SEAS) describe in this thesis is an in-situ, continuous flow instrument capable of a 0.5 Hz sampling frequency. A liquid core waveguide is used to achieve nanomolar detection levels. SEAS colorimetric analysis of phosphate with a molybdenum blue method allows for easy, rapid, open-ocean profiling as well as analysis in other aquatic ecosystems.

Student Research

Given the close proximity to the Gulf of Mexico and subtropical climate, the Tampa Bay region has a high concentration of marine research and academic institutions. Because of many local connections in the Tampa Bay area, a large number of opportunities are available to our students through government and private marine agencies and laboratories, public aquaria, marine conservation institutions, environmental consulting firms, and commercial aquaculture firms.

$1Mil Renovation Project

GMSL patio

The National Science Foundation awarded Eckerd College $870,720 to renovate research spaces within the Galbraith Marine Science Laboratory during the summer of 2011. Eckerd contributions to the project bring the total renovation budget to over $1 million. Learn more.