ISSN:
1573-5125
Keywords:
Chironomidae
;
pupal exuviae
;
organic enrichment
;
river assessment
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Exuvial samples were collected at stations above and below organic effluent inflows at twenty river sites near Bristol, England, during May, July and September, 1989. Exuvial sample data for each station were amalgamated and related to chemical data obtained from the Wessex and the Severn-Trent Regions of the National Rivers Authority. Principal Components Analysis (PCA) and Canonical Community Ordination (CANOCO) were used to derive biplots of taxa and selected environmental factors. From these biplots, lists of taxa were obtained, and ranked in order of closeness of association to selected organically-related environmental factors. Lists of ‘principal taxa’, either positively or negatively associated with a given environmental factor, were termed ‘indicator assemblages’ in respect of that factor. The rank orders of similarity of these ‘indicator assemblages’ to amalgamated exuvial samples from 51 stations on the River Trent, were significantly correlated (p〈0.001) to the same stations ranked in order of ammonia concentrations and biological oxygen demand (BOD.).
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02255285
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