Aquatics: 2_Aquatic Ecosystems

How do riparian zones contribute to aquatic ecosystem health and water quality?

• By filtering pollutants and providing habitat

• By increasing water temperature

• By reducing water flow

• By introducing invasive species

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What is one impact of harmful algal blooms on aquatic ecosystems and human health?

• Production of toxins that can harm aquatic life and humans

• Increase in fish population

• Improvement of water clarity

• Reduction of water temperature

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What is the difference between 'endangered' and 'threatened' species designations for aquatic organisms in Alberta?

• Endangered species are at a higher risk of extinction than threatened species

• Threatened species are extinct

• Endangered species are invasive

• Threatened species are not protected by law

Which resource would you consult to learn about the lake trophic state in Alberta?

• Brendan Wiltse, All About Lakes, 2025

• Environmental Public Health, Alberta Health Services, 2023

• Alberta Environmental Law 101

• Battle River Watershed, YouTube, 2022

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Which document provides information on the categories of species at risk in Alberta?

• Alberta Environmental Law 101, by abenvirolaws in Species Law

• Brendan Wiltse, All About Lakes, 2025

• Cows & Fish Riparian Management Society

• Government of Alberta, 2000

What is the main reason many people prefer to swim and recreate in oligotrophic lakes?

• They have clear water with low primary production.

• They have high levels of algae.

• They are warmer than other lakes.

• They have more bacteria.

Which of the following is NOT one of the four trophic states a lake can belong to?

• Thermotrophic

• Oligotrophic

• Mesotrophic

• Eutrophic

What is a likely consequence of increased primary production in the lake shown in the image?

• Decreased water clarity and lower oxygen in deeper waters

• Increased support for cold-water fish

• Higher water temperature

• No change in water quality

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Which nutrient is often the limiting factor for algae growth in lake ecosystems?

• Potassium

• Calcium

• Phosphorus

• Iron

Which of the following is NOT a natural source of nutrients for lakes?

• Bedrock geology

• Soils

• Surrounding vegetation

• Plastic waste