Human Impact on Ecosystems and Wildlife

The video discusses the significant impacts humans have on ecosystems, including causes of extinction, habitat destruction, hunting, poaching, overfishing, climate change, and the introduction of invasive species. It highlights the consequences of these actions, such as species decline, habitat loss, and ecosystem disruption. The video also covers the role of greenhouse gases in climate change and the effects of agricultural practices like fertilizer and pesticide use.

What is one of the main reasons for the increase in human impact on ecosystems?

• Decrease in global population

• Strict environmental laws

• High consumption rates in developed countries

• Abundance of natural resources

What is a wildlife corridor used for?

• To separate different species

• To connect fragmented habitats

• To prevent poaching

• To increase urban development

What is bycatch in the context of fishing?

• Fish caught for sport

• Unwanted marine life caught in nets

• Top predators removed from the ocean

• Fish that are overfished

How does the removal of top predators affect ocean ecosystems?

• It has no significant impact

• It increases fish populations

• It leads to trophic cascades

• It stabilizes the food web

What is a common consequence of releasing exotic pets into the wild?

• They become endangered

• They adapt and thrive without issues

• They improve biodiversity

• They become invasive species

Which gas is NOT typically associated with human-induced global climate change?

• Oxygen

• Methane

• Nitrous oxide

• Carbon dioxide

What is hypoxia in aquatic environments?

• An increase in fish populations

• A decrease in oxygen levels

• An increase in water temperature

• A decrease in water pollution

How do chemical pesticides like DDT affect the food chain?

• They bioaccumulate and become more toxic up the chain

• They improve the health of aquatic life

• They are harmless to all species

• They only affect the top predators

What was a significant impact of DDT on bald eagles?

• Increased their population

• Interfered with calcium uptake, weakening eggshells

• Made their eggshells stronger

• Had no effect on them

What is a major effect of increased fertilizer use in agriculture?

• Improved water quality

• Increased soil erosion

• Runoff leading to algal blooms

• Decreased crop yields