Effects of Municipal Wastewater and Run-off on Aquatic Systems Flashcards Preview

Toxicology > Effects of Municipal Wastewater and Run-off on Aquatic Systems > Flashcards

Flashcards in Effects of Municipal Wastewater and Run-off on Aquatic Systems Deck (12)
Loading flashcards...
1
Q

Environmental Stress

A

-rarely exposed to just 1 stressor, cumulative stressors

2
Q

Freshwater pollution

A
  • chemical cocktail
  • temperature
  • fishing
3
Q

Municipal wastewater effluent

A
  • Pharmaceuticals
  • Hormones
  • Personal care products
  • Microplastics
  • Bisphenol A
  • Illicit drugs
  • Caffeine
4
Q

Pharmaceuticals

A
  • Non-steroidal anti-inflammatory drugs (ibuprofen-alters gene expression)
  • Birth control pills (endocrine disruption)
5
Q

Hormones

A
  • estradiol, estrone, estriol
  • testosterone
  • natural hormones and compounds with structural similarities to estrogens can make wastewater have estrogenic effects
6
Q

Personal care

A
  • antibacterial products

- lead to selection of resistant bacteria

7
Q

Bisphenol A

A
  • BPA, BPS

- potent estrogenic compounds, replacement still bad, consequences are unknown

8
Q

Pollutants impacts on aquatic ecosystems

A
  • all effluent moves into sewage treatment plant at the same time
  • treatment plants only filter out phosphorous
  • affects areas downstream
9
Q

Endocrine disrupting compounds

A
  • interfere with normal hormone function
  • estrogen mimics
  • compounds in sewage effluent act like estrogen in organisms living downstream
  • feminization of male fish (intersex)
10
Q

intersex

A

-development on eggs in the testes

11
Q

Endocrine disrupting compounds example-birth control

A
  • multiyear whole lake manipulation (experimental lakes area)
  • ecotox BACI (before-after-control-impacted) design
  • ethynylestradiol was added
  • same response in both female and male fish
  • population collapsed
  • exposure levels were really high, very potent but not always detected in Canadian rivers
12
Q

Endocrine disrupting compounds example-sampling fish

A
  • sample fish to determine what is going on
  • longnose dace from rivers in Alberta (electrofishing)-even though water too potent for other fish species, their population will grow and thrive
  • collection of fish from a variety of areas near Lethbridge and Red Deer
  • cattle feed lots along Oldman river-hormones from cows move into river way
  • sex of fish turned towards females, males less abundant
  • vitellogenin-measure the gene expression levels
  • small testosterone amounts and more estrogenic compounds
  • gonad size and vitellogenin (estrogen compounds) have negative correlation