5 research outputs found
Relationship between aquatic insects and heavy metals in an urban stream using multivariate techniques
In the study, the relationship between some aquatic insect species
(Ephemeroptera, Plecoptera, Trichoptera and Odonata) and some heavy
metals (cadmium, lead, copper, zinc, nickel, iron and manganese) and
boron were assessed using data obtained from the Ankara Stream, which
flows through Ankara, the capital city of Turkey and receives high
organic and industrial wastes. Sampling was carried out monthly along
the Ankara Stream in 1991. environmental data were used to explain
biological variation using multivariate techniques provided by the
program canonical correspondence analysis ordination. The ordination
method canonical correspondence analysis was applied to evaluate the
relationships between environmental variables and distribution of
aquatic insect larvae. Data sets were classified by two way indicator
species analysis. In this study, aquatic insecta communities have been
shown by canonical correspondence analysis ordination as related to
total hardness, pH, cadmium, lead, copper, zinc, nickel, iron,
manganese and boron. Cadmium, lead, copper and boron exceeded limits of
the United States Environmental Protection Agency criteria for aquatic
life. Trichopteran, Dinarthrum iranicum was an indicator of two way
indicator species analysis and was placed close to the arrow
representing copper. Odonate, Aeschna juncea was an indicator of two
way indicator species analysis in site 10 and was placed close to the
arrows representing manganese, lead, and nickel. Trichopteran,
Cheumatopsyche lepida and odonate, Platycnemis pennipes were indicators
of two way indicator species analysis for sites 6, 7, 11, 14, 15, 18
and were placed close to the arrows representing cadmium, boron, iron
and total hardness