Study ID 338

Dynamics and Organization of a Rocky Intertidal Fish Assemblage

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Realm: Marine
Climate: Temperate
Biome: Temperate shelf and seas ecoregions
Central latitude: 38.000000
Central longitude: -123.000000
Duration: 3 years, from 1979 to 1981

203 records

29 distinct species

Across the time series Apodichthys flavidus is the most frequently occurring species


Grossman, G. D. (1982) Dynamics and Organization of a Rocky Intertidal Fish Assemblage: The Persistence and Resilience of Taxocene Structure. The American Naturalist, 119, 611–637.


A total of 15 collections were made from January 1979 to May 1981. Two of these collections (March and October 1979) were excluded from analyses because a combination of storms and insufficient low tides (-0.15 m) prevented adequate sampling. The remaining 13 collections were made during low tides ranging from -0.24 to -0.46 m. Sampling consisted of spreading a 10% solution of quinaldine (an anesthetic) throughout the study site until fully anesthetized fishes were observed. Specimens were then collected by hand or with dip nets and sampling was terminated after a complete search of the study site failed to yield additional specimens. This included overturning rocks and boulders by hand which were then replaced with minimal disruption. Three investigators have shown that quinaldine collections yield relatively unbiased estimates of the relative abun- dances of fishes in intertidal areas (Gibson 1967b; Grossman 1979; Yoshiyama 1981). Excluding the May 1981 sample where all specimens were identified and returned to the site alive specimens after collection were placed in 10% formalin and identified. They were later transferred to 45% isopropanol measured (standard length) and weighed on an analytic balance to the nearest 0.1 g. All lengths reported refer to standard length (Hubbs and Lagler 1958) Spot mapping was used to create species maps these were then used to esstemate the number of teratories for each species. Ten surveys were made each year and the total number of aparent teratories were counted. New teratories were accepted if they were sufficient distance away from existing ones. Unit of abundance = IndCountInt, Unit of biomass = NA