Chapter

Quantifying Abundance

Steven N. Murray, Richard F. Ambrose and Megan N. Dethier

in Monitoring Rocky Shores

Published by University of California Press

Published in print March 2006 | ISBN: 9780520247284
Published online March 2012 | e-ISBN: 9780520932715 | DOI: http://dx.doi.org/10.1525/california/9780520247284.003.0007
Quantifying Abundance

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Species abundances in rocky intertidal zones are generally expressed as numerical density or counts as cover. Occasionally, however, the goals of a sampling program require that the biomass of rocky intertidal organisms are determined and used to express abundance. Biomass is defined as the mass of living organisms in a population at the time of sampling. Unlike density determinations, which require the ability of the investigators to distinguish individual organisms, biomass can be measured for all seaweeds and invertebrates. This chapter describes a procedure for harvesting large seaweeds and macroinvertebrates from field plots.

Keywords: species abundances; sampling; biomass; seaweeds; macroinvertebrates; plots; rocky intertidal organisms

Chapter.  4981 words.  Illustrated.

Subjects: Animal Pathology and Diseases

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