Changes in ecosystems | AQA GCSE 9-1 Geography скачать в хорошем качестве

Changes in ecosystems | AQA GCSE 9-1 Geography

What causes change in ecosystems? What are the natural factors? What are the human factors? This is the twenty-second video for the AQA GCSE 9-1 Geography course, and the second video of The Living World topic. The Living World Playlist: »    • The Living World | AQA GCSE 9-1 Geography   Follow me on all platforms: » https://linktr.ee/keducate Do you have a video suggestion? » https://forms.gle/gxc3xHQ1b1wUeANT9 Video Script: The components of an ecosystem are very dependent on each other, which means changing one can have a huge knock-on effect throughout the whole ecosystem. This change can occur as a result of natural changes, or human activities. This can take place on both local and global scales. Natural factors that affect ecosystems include drought, flooding, fires and disease. For example droughts can cause certain areas of ponds and lakes to dry up, which drastically affects the animals and plants living there. Plants could dry out and die, and fish could be starved of oxygen, also dying. Human activities can have many impacts: Deforestation and the removal of hedgerows results in the loss of habitats for numerous species, which interrupts the nutrient cycle and can have devastating effects on these species. Ponds may be drained, which kills off aquatic plants, fish and other pond life. Changing the pH level of the water can make it unsuitable for species that live there, causing them to die. Agricultural fertilisers can lead to a process known as eutrophication; where nitrates increase the growth of algae, depleting oxygen levels in the water, which can cause fish to die. Introducing more fish to the pond can have a huge effect on the food chain, as they will eat more of the creatures below them on the food chain (eg. frogs), which leaves behind less food for other predators. On top of this, the decreased number of frogs means the species below frogs on the food chain (eg. slugs) will grow in number, due to less predators eating them. -- GCSE Geography 03/05/2023 Keducate