Question

4.1 ecosystem changes (day 1 - 1)

1. what factors can cause an ecosystem to change over time? give one example.
2. how can an ecosystem recover after a natural disturbance such as a wildfire or flood?
3. why is stability important for an ecosystem, and what can happen if that stability is disrupted?
4. how do human actions, like deforestation or pollution, affect the balance and stability of ecosystems?
5. what role do decomposers play in helping ecosystems stay stable?
6. how can climate change impact the stability of ecosystems around the world?
7. what might happen to an ecosystem if one key species disappears?
8. how do limiting factors, such as food or water availability, help keep populations in balance within an ecosystem?
9. what could happen to an ecosystem if limiting factors were removed or reduced?
10. how do predators act as a limiting factor that supports the stability of an ecosystem?

Explanation:

1. Answer for Question 1: Factors include climate change. For example, rising temperatures can alter species - habitats.
2. Answer for Question 2: After a natural disturbance, an ecosystem can recover through secondary succession. Pioneer species first colonize the area, followed by more complex plant and animal species over time.
3. Answer for Question 3: Stability is important as it allows species to co - exist and ecosystems to function properly. If disrupted, species may decline or go extinct, and ecosystem services like water purification may be lost.
4. Answer for Question 4: Deforestation reduces habitat and biodiversity, while pollution can harm or kill organisms and disrupt food webs, thus upsetting the balance and stability of ecosystems.
5. Answer for Question 5: Decomposers break down dead organic matter, recycling nutrients back into the soil. This nutrient cycling is essential for plant growth and overall ecosystem stability.
6. Answer for Question 6: Climate change can cause sea - level rise, altered precipitation patterns, and temperature changes. These can lead to habitat loss, species range shifts, and increased frequency of extreme weather events, all of which threaten ecosystem stability.
7. Answer for Question 7: If a key species disappears, it can cause a trophic cascade. For example, the loss of a top predator can lead to an over - population of its prey, which can then over - graze plants, affecting the entire food web.
8. Answer for Question 8: Limiting factors like food or water availability set a carrying capacity for populations. When populations approach this limit, competition increases, and population growth slows or stabilizes, maintaining balance.
9. Answer for Question 9: If limiting factors were removed or reduced, populations could grow exponentially. This could lead to over - exploitation of resources, increased competition, and potential collapse of the ecosystem due to overcrowding and resource depletion.
10. Answer for Question 10: Predators act as a limiting factor by controlling the population size of their prey. This helps prevent over - population of prey species, which could otherwise damage plant communities and disrupt the ecosystem. By keeping prey populations in check, predators support overall ecosystem stability.

Answer:

1. Climate change; rising temperatures can alter habitats.
2. Through secondary succession with pioneer species colonizing first.
3. Allows species co - existence and proper functioning; species decline or extinction and loss of ecosystem services may occur.
4. Deforestation reduces habitat and biodiversity; pollution harms organisms and disrupts food webs.
5. Break down dead matter and recycle nutrients.
6. Causes habitat loss, species range shifts, and extreme weather events.
7. Can cause a trophic cascade affecting the food web.
8. Set a carrying capacity and slow population growth.
9. Populations could grow exponentially, leading to resource depletion.
10. Control prey population size to prevent over - population and damage to the ecosystem.