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Relations between trophic state indicators and fish in Florida (U.S.A.) lakes

Data were obtained from 65 Florida lakes ranging from oligotrophic to hypereutrophic to examine empirical relationships between fish and trophic state variables. A positive correlation was found between fish biomass per unit area and chlorophyll-a, total nitrogen and total phosphorus but secchi disk...

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Bibliographic Details
Published in:Canadian journal of fisheries and aquatic sciences 1996-04, Vol.53 (4), p.842-855
Main Authors: Bachmann, R W, Jones, B L, Fox, D D, Hoyer, M, Bull, L A, Canfield, Jr, D E
Format: Article
Language:English
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Summary:Data were obtained from 65 Florida lakes ranging from oligotrophic to hypereutrophic to examine empirical relationships between fish and trophic state variables. A positive correlation was found between fish biomass per unit area and chlorophyll-a, total nitrogen and total phosphorus but secchi disk transparency gave an inverse correlation. Species composition showed some shifts with changes in trophic state but significant changes in standing crops were found only for a few species. There were no important changes with trophic state for the recreationally important centrarchids. No significant changes were observed in fish abundance or standing crops at any critical point in the trophic spectrum. The more eutrophic Florida lakes were not observed to have the changes in fish population found in northern lakes. Possible reasons advanced were that Florida lakes did not have deep, cold, hypolimnia, ice cover in winter or salmonid species. There are 51 references.
ISSN:0706-652X
1205-7533
DOI:10.1139/f95-236