Abstract
Elevated aluminum (Al) concentrations are often associated with acid-stressed aquatic ecosystems, so it has been unclear whether acidic water or elevated Al is more responsible in changing community composition. Experiments were done to investigate effects of acidification and increased Al on the abundance of benthic algae in artificial streams supplied with natural water and nominal treatments of (a) pH 4.8, (b) 500 µg l-1 Al, or (c) the mixture of pH 4.8 and 500 µg l-1 Al compared to a control without added Al or acid. These treatments are referred to as ‘Acid’, ‘Al-only’, ‘Acid + Al’, and the ‘control’, respectively. In the Acid treatment the abundance of two diatoms, two green algae, dry weight biomass, and chlorophyll a decreased; one diatom and one filamentous blue-green alga increased. In the Al-only treatment, densities of two diatoms, one green alga, one blue-green alga, dry weight biomass, and chlorophyll a increased. In the Acid + Al treatment, abundances of one green alga, two blue-green algae, and concentrations of chlorophyll a decreased below the levels observed in the Acid treatment. Acid and Al concentrations were altered by each other and by chemical and biological processes in the stream system. Species of diatoms, green algae, and blue-green algae responded individually to treatments and mixtures of acid and Al. Shifts in the abundance of species may change food web relationships for higher-level consumers, and algae may be useful biomonitors of ecological stress.
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Genter, R.B. Benthic algal populations respond to aluminum, acid, and aluminum-acid mixtures in artificial streams. Hydrobiologia 306, 7–19 (1995). https://doi.org/10.1007/BF00007854
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DOI: https://doi.org/10.1007/BF00007854