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  2. Water clarity - Wikipedia

    en.wikipedia.org/wiki/Water_clarity

    Water clarity is one way that humans measure water quality, along with oxygen concentration and the presence or absence of pollutants and algal blooms. [1] Water clarity governs the health of underwater ecosystems because it impacts the amount of light reaching the plants and animals living underwater. For plants, light is needed for ...

  3. pH indicator - Wikipedia

    en.wikipedia.org/wiki/PH_indicator

    Hydrangea macrophylla flowers can change color depending on soil acidity. In acid soils, chemical reactions occur in the soil that make aluminium available to these plants, turning the flowers blue. In alkaline soils, these reactions cannot occur and therefore aluminium is not taken up by the plant. As a result, the flowers remain pink.

  4. UV coloration in flowers - Wikipedia

    en.wikipedia.org/wiki/UV_coloration_in_flowers

    The visible color of the flower impacts the UV color. [9] Yellow flowers having the greatest measure of reflectance. [5] It is more typical to observe UV coloration in purple, red and yellow flowers while white and green ones are less likely. [2] Generally flowers that are white or green tend to be wind pollinated; where being a bright color ...

  5. Floral color change - Wikipedia

    en.wikipedia.org/wiki/Floral_color_change

    Floral color change may also be caused by an increase or decrease in pH causing a reddening/blueing of anthocyanins and co-pigments. Floral color change can be inducible or non-inducible. Some flowers will change color at the same rate regardless of pollinator visitation, while others can be induced by pollen deposition on the stigma.

  6. Hydrangea - Wikipedia

    en.wikipedia.org/wiki/Hydrangea

    Hydrangea flower color changes based on the pH in soil. As the graph depicts, soil with a pH of 5.5 or lower will produce blue flowers, a pH of 6.5 or higher will produce pink hydrangeas, and soil in between 5.5 and 6.5 will have purple hydrangeas. Hydrangea flower color can change based on the pH in soil.

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  8. Water quality - Wikipedia

    en.wikipedia.org/wiki/Water_quality

    The National Water Quality Inventory Report to Congress is a general report on water quality, providing overall information about the number of miles of streams and rivers and their aggregate condition. [65] The CWA requires states to adopt standards for each of the possible designated uses that they assign to their waters.

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