Familiarise yourself with ecosystems.


Knowing how human activity impacts the planet is one of the key aims of the GCSE geography course. From this, you can develop an understanding of how the world needs to be managed in order to make sure that future generations will not suffer hardship as a result of our actions today. In order to fully understand the relationship between the natural world and humans, you need to know how ecosystems work. Global ecosystems support life on the Earth, the wellbeing of humans is closely linked to the wellbeing of global ecosystems.

Firstly, you need to be aware of what an ecosystem is. It is defined as the interdependence of plants, animals, climate, water and soil in a given location. Plants and animals are called the biotic factors whilst the climate, soil and water supply are abiotic factors.

Because an ecosystem is an interdependence, any change to one of the factors will cause changes to the others. Since human beings are mammals, as animals, we affect any ecosystem that we come into contact with. When we are extracting or taking resources from the earth, it therefore affects ecosystems.

In many cases, we don't fully appreciate the effects that we are having on an ecosystem e.g. urban development. When building new homes or an out-of-town retail centre, we notice that the trees and fields are destroyed, however, we are unaware of the changes in the other populations e.g. micro-organisms, or physical factors like the the local water table and microclimates. On a small scale, these changes are generally not particularly significant, but as cities grow and our use of resources increases, we could find that our way of life has very significant implications for the health of our planet. An example of this is the destruction of the tropical rainforests.

The key is to manage ecosystems that provide us with resources in a sustainable way. To achieve this, we need to understand how ecosystems work and for the GCSE, you need to know and to be able to use some of the key terms. The source of energy is the Sun. This is used by plants, enabling them to grow. Plants are called producers. These are eaten by animals like mice, slugs or larger herbivores. These are called the primary consumers. Animals which eat primary consumers are called secondary consumers and so on. At each level of the ecosystem, there are differing numbers of organisms, e.g. there are fewer secondary consumers than primary consumers. Also in an ecosystem, there are decomposers like worms and fungi who recycle the nutrients.

Another term that you need to know for your exam is biome. These are large-scale global ecosystems that are defined by similar abiotic factors like climate and relief e.g. mediterranean, desert and savannah. A healthy ecosystem is sustainable and where human activity disturbs it, it will change. If the change to the ecosystem is too great, it collapses. This is then a problem for the humans using the ecosystem as they lose the resources it provides.

Why is it important to use ecosystems sustainably?
So that the economy of a country can develop
To ensure the continued supply of the resources we obtain
So that local people will always have jobs
To ensure that globalisation can take place
Where changes to ecosystems through human activity is not sustainable, permanent changes will occur and resources may no longer be available to us
In which of the following biomes is the UK situated?
Temperate deciduous forest
Coniferous forest
The largest area covered by this biome is western Europe
Which of the following statements about ecosystems is NOT true?
Ecosystems provide resources for people
Human activity has no effect on ecosystems
Ecosystems are important globally
Sustainability is important when taking resources from any ecosystem
Any human activity will have an effect on local ecosystems
Which of the following is NOT an abiotic factor in an ecosystem?
Abiotic factors are the non-living components of an ecosystem
What is a biome?
A micro-ecosystem
A small-scale ecosystem
A medium-scale ecosystem
A large-scale ecosystem
Biomes can stretch across entire continents
Which of the following is the most likely to be the first indication that something was wrong with an ecosystem?
The grass dies
Trees die
The mouse population drops
Birds of prey disappear from the ecosystem
The most sensitive part of an ecosystem is the top predator species
The links between the plants and animals and the animals that eat them are called:
a food circle
a food chain
a feeding group
a food mile
Usually, the feeding relationships in an ecosystem are complex and are best represented by a food web
The name given to the group of organisms that recycle the nutrients in an ecosystem is:
the decomposers
the liquidators
the exterminators
the predators
They are essential for a healthy ecosystem
Which of the following is NOT a reason for sustainable use of a tropical rainforest?
Rainforests provide many useful resources
Rainforests help to regulate the atmosphere
Native inhabitants need the resources a rainforest supplies
To enable people to travel deep into the rainforest
Tropical rainforests can provide many useful materials - food, building materials, substances that can be turned into medical drugs and more
Which of the following is a cause of deforestation in a tropical rainforest?
Subsistence farming
Mineral extraction
Population growth
All of the above
Other reasons include logging, commercial farming, road building, energy generation and the development of new and existing settlements
You can find more about this topic by visiting BBC Bitesize - Ecosystems

Author:  Kev Woodward

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