Winemaking Affects Aquatic Ecosystem

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Winemaking Process and Runoff

In vinification, the grapes are first grown, then harvested. Grape juices are then fermented and treated. The quality of wine is heavily dependent on the grapes used.[1] In order to produce high quality wine while lowering production costs, vintners need to find economic methods to aid grape growth. Fungus is a common cause of disease in grape species, and can lead to severe economic loss.[2]
To protect grapevines against fungal infections, winemakers use a fungicide called Bordeaux Mixture.[3] The Bordeaux Mixture is composed of copper(II) sulfate (CuSO4), calcium hydroxide (Ca(OH)2), and water. This combination is highly effective and long-lasting. Bordeaux Mixture enables cupric ion-mediated inhibition of enzymes involved in fungal spore formation.[4] However, the Bordeaux Mixture is also more phytotoxic than other fungicides.[5] Due to the solubility of copper(II) sulfate, Bordeaux Mixture is susceptible to runoff.[6]
In 2009, the wine producing province of Champagne in France contained exceptionally high copper content in its water systems, with the mean of 53.6 μg/dm3 of copper in basin water samples collected locally, and 24% of samples reached over 100 μg/dm3 of copper content according to an ecological survey.[7] This presents a severe issue to both the aquatic ecosystem and human health, as long-term exposure to copper contaminated foods can lead to chronic diseases.[8] Recent studies and bioassays conducted has been focused on the threshold level and control of copper levels, and subsequent effect and recovery of aquatic ecosystems.

Use of Algae as Model Organisms

Algae such as Chlorella vulgaris are primarily discussed as a model organism. C. vulgaris is a single celled green spherical microalga found naturally in freshwater.[9] C. vulgaris and other algae are susceptible to minor changes to its immediate environment, therefore extensively used in studies in population dynamics and bioassays.[10] In addition to the sensitivity of C. vulgaris to the environment, it can be easily grown and observed in a laboratory setting, making it a prime organism to model algae. Other aquatic organisms are also taken into account. Marine organisms, namely saltwater algae usually display lower copper tolerance than freshwater algae, and will be affected by vineyard runoff,[11] but will not be discussed in detail. “Algae” in this page is used when a study examines multiple species of algae, and those species displayed a consistent response. Species names are used when a study only examined one species or that different species displayed different responses.

Effect of Varying Copper Concentrations

Trace amounts of copper ions have negligible effects on algal growth, and is not a main contributor to ecological damage.[12] At concentrations of 10-15 to 10-7 M, the algal growth is enhanced, due to natural demand for cupric ions as nutrients.[11] At higher copper concentrations, below 1 mg/L, cupric ions have an adverse effect on algal growth.[13] The relationship between copper concentration and algae growth rate is logarithmic, with a 40% decline in growth rate at 0.005 mg/L, 50% between 0.015 and 0.020 mg/L, and 80% at 0.1 mg/L of copper.[14]
As a coping mechanism against high concentrations of heavy metal, including copper, algae can regulate the amount of copper intake.[15] The copper that was taken up can be immobilized intracellularly.[11]
At concentrations of above 1 mg/L of copper, the growth of algae is greatly reduced, while between 2 and 5 mg/L of copper shows no difference in effects on C. vulgaris. The higher copper concentration also promoted a disruptive selection pattern in algal cell size, namely large and small cells were favored over average-sized cells (Liu, 2021). The LD50 critical concentration of copper is 5 mg/L (Fan, et al., 2018). The tolerance of algae for copper is decreased when compounded with other toxicants such as silver ions. In the presence of 0.75 mg/L of colloidal silver ions, 0.2 mg/L of copper is effective in controlling algal population (Fitzgerald, et al., 1952). Overall, the phytotoxicity of copper is likely compounded by the presence of other metal ions (Young & Lisk, 1972).




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References

  1. ↑ Amerine, M. A., 2021. Wine. [Online] Available at: https://www.britannica.com/topic/wine [Accessed 20 November 2021].
  2. ↑ University of Maryland, 2021. Grape Diseases. [Online] Available at: https://extension.umd.edu/resource/grape-diseases [Accessed 20 November 2021].
  3. ↑ Schilder, A., 2010. Fungicide properties and weather conditions. [Online] Available at: https://www.canr.msu.edu/news/fungicide_properties_and_weather_conditions [Accessed 11 November 2021].
  4. ↑ Liu, H. et al., 2015. Copper Ion Elicits Defense Response in Arabidopsis thaliana by Activating Salicylate- and Ethylene-Dependent Signaling Pathways. Molecular Plant, 8(10), pp. 1550-1553.
  5. ↑ Broome, J. C. & Donaldson, D. R., 2010. Bordeaux Mixture. [Online] Available at: http://ipm.ucanr.edu/PMG/PESTNOTES/pn7481.html [Accessed 20 November 2021].
  6. ↑ Pompermaier, A. et al., 2021. Water and suspended sediment runoff from vineyard watersheds affecting the behavior and physiology of zebrafish. Science of The Total Environment, 757(1).
  7. ↑ Banas, D. et al., 2010. Copper mobilization affected by weather conditions in a stormwater detention system receiving runoff waters from vineyard soils (Champagne, France). Environmental Pollution, 158(2), pp. 476-482.
  8. ↑ European Food Safety Authority, 2021. Metals as contaminants in food. [Online] Available at: https://www.efsa.europa.eu/en/topics/topic/metals-contaminants-food [Accessed 25 February 2021].
  9. ↑ Universal Protein Resource, 2018. Taxonomy - Chlorella vulgaris (Green alga). [Online] Available at: https://www.uniprot.org/taxonomy/3077 [Accessed 9 May 2020].
  10. ↑ Bi, R. et al., 2018. Sensitivities of seven algal species to triclosan, fluoxetine and their mixtures. Scientific Reports, s.l.(s.l.), p. s.l..
  11. ↑ 11.0 11.1 11.2 Knauer, K., Behra, R. & Sigg, L., 2009. Effects of free Cu2+ and Zn2+ ions on growth and metal accumulation in freshwater algae. Environmental Toxicology, 16(2), pp. 220-229.
  12. ↑ Tubbing, D. M. et al., 1994. The contribution of complexed copper to the metabolic inhibition of algae and bacteria in synthetic media and river water. Water Research, 28(1), pp. 37-44.
  13. ↑ Moss, V. A., Roberts, J. A., Keith, H. & Simpson, L., 1977. The effect of copper sulfate on the growth of the alga Chlorella. British Homeopathic Journal, 66(3), pp. 169-177.
  14. ↑ Brian, T. K. & Meadows, S., 1978. The toxic effect of copper on algae and rotifers from a Soda Lake (Lake Nakuru, East Africa). Water Research, 12(10), pp. 771-775.
  15. ↑ Trollope, D. R. & Evans, B., 1976. Concentrations of copper, iron, lead, nickel and zinc in freshwater algal blooms. Environmental Pollution (1970), 11(2), pp. 109-116.
  16. ↑ Hodgkin, J. and Partridge, F.A. "Caenorhabditis elegans meets microsporidia: the nematode killers from Paris." 2008. PLoS Biology 6:2634-2637.
  17. ↑ Bartlett et al.: Oncolytic viruses as therapeutic cancer vaccines. Molecular Cancer 2013 12:103.
  18. ↑ Lee G, Low RI, Amsterdam EA, Demaria AN, Huber PW, Mason DT. Hemodynamic effects of morphine and nalbuphine in acute myocardial infarction. Clinical Pharmacology & Therapeutics. 1981 May;29(5):576-81.


Edited by Sizhuo Liu, student of Joan Slonczewski for BIOL 116 Information in Living Systems, 2021, Kenyon College.

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