Ecological Concepts and Human Impact

Chapter 5 covers environmental systems and ecosystem ecology, focusing on feedback loops, system interactions, energy conversion, and biogeochemical cycles. It explains negative and positive feedback loops, the concept of watersheds, and the impact of nutrient influx on ecosystems. The chapter also delves into energy conversion to biomass, geographic patterns, and the four main biogeochemical cycles: water, carbon, nitrogen, and phosphorus. The conclusion highlights the complexity of ecosystems and the importance of understanding human impacts, with a preview of the next chapter on environmental ethics and economics.

What does a negative feedback loop indicate in an ecosystem?

• A stable ecosystem

• An ecosystem with no feedback

• An unstable ecosystem

• A rapidly changing ecosystem

What is a watershed?

• A region drained by a river

• A type of feedback loop

• A nutrient cycle

• A type of ecosystem

What is the primary consequence of eutrophication in lakes?

• Improved water clarity

• Decreased nutrient levels

• Algae blooms and oxygen depletion

• Increased fish population

What is net primary production?

• Energy used by consumers

• Energy lost in the ecosystem

• Energy remaining after respiration used to create biomass

• Total energy assimilated by autotrophs

What is a dead zone in an aquatic system?

• A region with excessive nutrients

• An area with high biodiversity

• An area with little to no oxygen

• A zone with high water clarity

What is an ecotone?

• A type of nutrient cycle

• A transitional zone between ecosystems

• A stable ecosystem

• A type of feedback loop

What is the role of a model in ecology?

• To predict weather patterns

• To simplify and represent natural systems

• To eliminate dead zones

• To increase biodiversity

What is the main human impact on the carbon cycle?

• Increased plant photosynthesis

• Rapid release of fossil fuels into the atmosphere

• Decreased carbon emissions

• Increased carbon storage in oceans

What is the primary source of phosphorus in the environment?

• Atmospheric deposition

• Erosion of rocks

• Ocean currents

• Plant decay

What is the significance of the nitrogen cycle in environmental science?

• It is unrelated to human activities

• It is crucial for plant protein synthesis

• It has no impact on ecosystems

• It is the simplest cycle to understand