Question

1. sep construct explanations human activity can affect ecosystems by removing producers, consumers, and decomposers. what limiting factors may result from human actions, and what effects might they have on the flow of energy and matter in an ecosystem?

Explanation:

• Limiting factors:
• Removing producers:
• Producers (like plants) are the base of the food chain. Human activities like deforestation (cutting down trees) remove producers. This limits the amount of food and habitat available.
• For example, in a forest ecosystem, if trees (producers) are cut down, herbivores (primary consumers) that eat leaves or fruits from these trees lose their food source.
• Removing consumers:
• Over - hunting of consumers (e.g., wolves in a forest - grassland ecosystem). Wolves are secondary or tertiary consumers. Removing them can lead to an over - population of their prey (like deer).
• Deer over - population can then over - graze plants (producers), further disrupting the ecosystem.
• Removing decomposers:
• Decomposers (such as fungi and bacteria) break down dead organic matter. Human activities like pollution (e.g., oil spills) can kill decomposers.
• Without decomposers, dead plants and animals do not decompose properly. Nutrients are not recycled back into the soil.
• Effects on energy and matter flow:
• Energy flow:
• Energy flows from producers (via photosynthesis capturing solar energy) to consumers (through eating). If producers are removed, less energy is available at the base of the food chain.
• For example, in a grass - rabbit - fox food chain, if grass (producer) is reduced, rabbits (primary consumer) have less energy (food) available, and foxes (secondary consumer) that eat rabbits also have less energy.
• Matter flow (nutrient cycling):
• Decomposers play a key role in matter flow. They break down dead organisms and release nutrients (like nitrogen, phosphorus) back into the soil.
• If decomposers are removed (e.g., due to pollution), nutrients are not recycled. Producers then lack essential nutrients for growth, affecting the entire food chain. For example, in a lake ecosystem, if decomposers are killed by pollution, dead algae (producers) sink to the bottom and do not decompose. Nutrients are not released, and new algae growth is limited.

Answer:

Limiting factors from human - caused removal of producers (e.g., deforestation reducing food/habitat), consumers (e.g., over - hunting disrupting prey - predator balance), and decomposers (e.g., pollution killing them). Effects: Disrupts energy flow (less energy at food - chain base if producers removed; cascading energy shortages up the chain) and matter flow (nutrient cycling fails without decomposers, affecting producer growth and thus the whole ecosystem).