Environmental Science 101: Ecosystems and Biodiversity - Ecosystem Services Provisioning Regulating Cultural Supporting Millenium Ecosystem Assessment

What This Is

Ecosystem services refer to the benefits that humans derive from functioning ecosystems, including provisioning, regulating, cultural, and supporting services. These services are essential for human well-being, but they are under threat due to human activities such as deforestation, pollution, and climate change. For example, the Amazon rainforest provides a significant portion of the world's oxygen, regulates the global water cycle, and supports a vast array of biodiversity. However, deforestation and land degradation in the Amazon have led to a decline in these ecosystem services, with severe consequences for human health, the economy, and the environment.

Key Concepts, Laws & Models

• Millennium Ecosystem Assessment (MEA): A comprehensive assessment of the world's ecosystems and the services they provide, highlighting the importance of ecosystem services for human well-being and the need for sustainable management of ecosystems.
• Provisioning Services: The production of food, water, timber, and other essential resources by ecosystems, such as fisheries, agriculture, and forestry.
• Regulating Services: The regulation of climate, water, and air quality by ecosystems, such as carbon sequestration, flood control, and air purification.
• Cultural Services: The non-material benefits that people derive from ecosystems, such as recreation, tourism, and spiritual experiences.
• Supporting Services: The processes that maintain the health and resilience of ecosystems, such as nutrient cycling, soil formation, and primary production.
• Tragedy of the Commons (Hardin): Shared resources are overexploited when individuals act in their own self-interest, leading to degradation of the resource and loss of ecosystem services.
• Carrying Capacity: The maximum amount of a resource that an ecosystem can sustainably provide without degrading its own health and resilience.
• Biodiversity-Functionality Relationship: The relationship between the diversity of species in an ecosystem and its ability to provide ecosystem services.
• Ecosystem Resilience: The ability of an ecosystem to withstand and recover from disturbances and stressors.
• Adaptive Management: A management approach that involves monitoring, evaluating, and adjusting management strategies to ensure that ecosystem services are maintained or restored.

Step-by-Step Application

1. Calculate a Carbon Footprint: Estimate the amount of greenhouse gas emissions associated with a particular activity or product, using tools such as the carbon footprint calculator.
2. Evaluate an Environmental Impact Assessment (EIA): Assess the potential environmental impacts of a proposed project or policy, using criteria such as the potential for habitat destruction, water pollution, and climate change.
3. Predict Population Growth: Use the rule of 70 to estimate the time it takes for a population to double in size, based on its current growth rate.
4. Assess Ecosystem Resilience: Evaluate the ability of an ecosystem to withstand and recover from disturbances and stressors, using indicators such as species diversity, habitat fragmentation, and climate change vulnerability.
5. Develop an Adaptive Management Plan: Design a management plan that involves monitoring, evaluating, and adjusting strategies to ensure that ecosystem services are maintained or restored.

Common Misconceptions

• Misconception: "Global warming is caused by the ozone hole."
• Correction: The ozone hole is a separate issue caused by the release of chlorofluorocarbons (CFCs), which deplete the ozone layer and allow more UV radiation to reach the Earth's surface. Global warming is primarily caused by the increase in greenhouse gases such as carbon dioxide and methane.
• Misconception: "All pollutants are visible."
• Correction: Many pollutants, such as particulate matter and ozone, are invisible but still pose significant health risks.
• Misconception: "Renewable energy has no environmental impact."
• Correction: While renewable energy sources such as solar and wind power have lower environmental impacts than fossil fuels, they can still have significant environmental impacts, such as habitat disruption and resource extraction.

Exam / Free-Response Tips

• Multiple-Choice Traps: Be careful of questions that try to trick you into choosing an incorrect answer, such as "What is the primary cause of global warming?" (Answer: The increase in greenhouse gases, not the ozone hole.)
• Free-Response Questions (FRQs): Use the MEA framework to structure your answer, and be sure to provide specific examples and evidence to support your arguments.
• Document-Based Questions (DBQs): Use the provided documents to identify key concepts and relationships, and be sure to provide clear and concise answers.

Quick Practice Scenario

A farmer applies excessive nitrogen fertilizer to a field, causing a nearby lake to experience an algal bloom. Which nutrient cycle is disrupted, and what secondary effect will deplete oxygen?

Answer: The nitrogen cycle is disrupted, leading to an overabundance of nitrogen in the lake, which will stimulate the growth of algae and deplete oxygen levels.

Last-Minute Cram Sheet

• Ecosystem Services: Provisioning, regulating, cultural, and supporting services.
• Millennium Ecosystem Assessment (MEA): A comprehensive assessment of the world's ecosystems and the services they provide.
• Carrying Capacity: The maximum amount of a resource that an ecosystem can sustainably provide without degrading its own health and resilience.
• Biodiversity-Functionality Relationship: The relationship between the diversity of species in an ecosystem and its ability to provide ecosystem services.
• Ecosystem Resilience: The ability of an ecosystem to withstand and recover from disturbances and stressors.
• Adaptive Management: A management approach that involves monitoring, evaluating, and adjusting management strategies to ensure that ecosystem services are maintained or restored.
• Tragedy of the Commons (Hardin): Shared resources are overexploited when individuals act in their own self-interest, leading to degradation of the resource and loss of ecosystem services.
• Kyoto Protocol: An international agreement to reduce greenhouse gas emissions and mitigate climate change.
• Paris Agreement: An international agreement to limit global warming to well below 2°C and pursue efforts to limit it to 1.5°C above pre-industrial levels.
• El Niño: A warm phase of the ENSO cycle, characterized by high sea surface temperatures in the Pacific Ocean.