A stationary visual census technique for quantitatively assessing community structure of coral reef fishes

Bohnsack, James A. and Bannerot, Scott P. (1986) A stationary visual census technique for quantitatively assessing community structure of coral reef fishes. NOAA/National Marine Fisheries Service, (NOAA Technical Report NMFS, 41)

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Abstract

A new method is described and evaluated for visually sampling reef fish community structure in environments with highly diverse and abundant reef fish populations. The method is based on censuses of reef fishes taken within a cylinder of 7.5 m radius by a diver at randomly selected, stationary points. The method provides quantitative data on frequency of occnrrence, fish length, abundance, and community composition, and is simple, fast, objective, and repeatable. Species are accumulated rapidly for listing purposes, and large numbers of samples are easily obtained for statistical treatment. The method provides an alternative to traditional visual sampling methods. Observations showed that there were no significant differences in total numbers of species or individuals censused when visibility ranged between 8 and 30 m. The reefs and habitats sampled were significant sources of variation in number of species and individuals censused, but the diver was not a significant influence. Community similarity indices were influenced significantly by the specific sampling site and the reef sampled, but were not significantly affected by the habitat or diver (PDF file contains 21 pages.)

Item Type: Monograph or Serial Issue
Title: A stationary visual census technique for quantitatively assessing community structure of coral reef fishes
Personal Creator/Author:
CreatorsEmail
Bohnsack, James A.
Bannerot, Scott P.
Series Name: NOAA Technical Report NMFS
Number: 41
Date: 1986
Publisher: NOAA/National Marine Fisheries Service
Issuing Agency: United States National Marine Fisheries Service
Subjects: Ecology
Fisheries
Biology
Item ID: 2781
Depositing User: Patti M. Marraro
Date Deposited: 10 Nov 2009 12:29
Last Modified: 29 Sep 2011 18:28
URI: http://aquaticcommons.org/id/eprint/2781

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