Benthic Macroinvertebrate Analysis

Benthic brittle stars and sea cucumbers.

Marine benthic macroinvertebrates are collected using a grab sampler or corer. The collected sediment sample is then screened to remove fine-grained sediment, and the macroinvertebrates are hand sorted from the remaining coarse material. The animals are preserved, and later examined under a magnifying lens or dissecting microscope. Organisms are enumerated and identified to the genus, and in many cases, species level.

Stereomicroscope.

Studying the macroinvertebrate population at a site provides us with an indication of the biodiversity of the site. It may also assist us in determining whether or not a site is being affected by pollutants or other stressors. Long term macroinvertebrate studies can provide baseline information about an area, and can monitor changes that are occurring.

Magnifying lamp with marine sponge.