Methods for Monitoring Carrion Decomposition in Aquatic Environments

Abstract

Monitoring carrion decomposition in aquatic environments is much more complex than in terrestrial habitats, making this area much less studied. Depth and safety issues are major concerns and greatly increase costs. As well, variance in abiotic features are much greater than those seen in terrestrial environments. In fresh water environments, sampling from carrion can be conducted using kick seines, or carcasses can be placed in a cage that can be briefly lifted for sampling. Nets placed behind the cage can retrieve dislodged macroinvertebrates. Unless in very shallow waters, marine studies require the use of divers or remotely operated cameras and sensors. Most studies involve baited cameras which allow video or still imaging of the carcass. Cage systems are frequently required in order to eliminate large vertebrates such as sharks from consuming the carcasses. Overall, there are many techniques available for studying aquatic carrion ecology, although the techniques employed vary depending on the research question and desired data.