The Tropicalisation of Western Atlantic Seagrass Beds


This project is an opportunity to explore the broader impacts of climate change on the ecology of seagrass ecosystems and the species supported by them, in an NSF funded project being led by The Smithsonian Institution in collaboration with The Centre for Ocean Research and Education, starting May 2018. 

Seagrass meadows are among some of the most productive marine ecosystems on earth, supporting a diverse assemblage of species and offering living space and shelter to a range of ecologically important fauna. As primary producers, seagrass meadows create rich feeding grounds for herbivorous species such as manatees and turtles as well as epibenthic predators, like stingrays. In addition, the iconic Bahamian queen conch rely on seagrass beds for adult life-history stages.

The functional significance of seagrass ecosystems are considered critical in the overall dynamics of coastal and nearshore environments, as they provide structure, reduce disturbance and sedimentation rates, as well as typically enhancing biodiversity. Through these processes, seagrasses are considered a class of ‘ecosystem engineer’ and essentially structure habitats, creating nutrient gradients among sediments.

Climate change is altering the ecological functioning of a broad range of terrestrial and marine communities and while prior work has addressed the direct effects of climate on organismal functioning, many studies fail to consider how alterations in biotic interactions (via shifts in species ranges and food web dynamics) might serve to obscure, or even amplify, the direct effects of climate on ecological structure.

This exciting project will involve coordinated field experiments conducted across 20 degrees of latitude among multiple institutions, incorporating the geographic range of turtlegrass (Thalassia testudinum) to investigate effects of tropicalisation and increased herbivory on the function of foundational species and associated flora and fauna.

Updates will be posted here, and on our Instagram Page. 

- Update 1 -

As the project enters its fifth month, all components are continuing smoothly. The project's duration has also been extended, resulting in continual monitoring of the site for a full year. Such an extension enables seasonal changes to be observed as well as the initial focus on grazing and nutrient effects that may result from climate change. A large barracuda approximately 4 feet in length has also taken up residence within the experimental array, highlighting the importance of seagrass meadows as keystone ecosytems in The Bahamas.

Updates on this project can be found here and on our Instagram Page. Please contact us through our website for further information!



Image courtesy of Shane Gross