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/9780520247284.003.0006
Quantifying Abundance

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Most rocky intertidal zone field studies require quantification of abundance, of either individual species or other taxonomic units of the investigator's choice. Data indicating species abundances can be collected quickly using subjective scales or by determining the presence of species in defined sampling units. This chapter reviews various methods of quantifying the density and cover of rocky intertidal populations using nondestructive sampling procedures. It discusses procedures used to collect abundance data during rapid surveys and while using plotless and line transect sampling methods. It focuses on plot- or quadrat-based methods for determining density and cover of intertidal macroalgae and macroinvertebrates. Differences between plots and quadrats are somewhat semantic and the terms are used as functional synonyms in this chapter.

Keywords: density; cover; field studies; intertidal zone; plots; quadrats; macroalgae; macroinvertebrates; nondestructive sampling

Chapter.  11458 words.  Illustrated.

Subjects: Animal Pathology and Diseases

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