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The population of native white-clawed crayfish in English rivers is decreasing due to an increasing population of American imported signal crayfish - Edexcel - GCSE Biology - Question 1 - 2021 - Paper 1
Question 1
The population of native white-clawed crayfish in English rivers is decreasing due to an increasing population of American imported signal crayfish. Figure 1 shows ... show full transcript
Worked Solution & Example Answer:The population of native white-clawed crayfish in English rivers is decreasing due to an increasing population of American imported signal crayfish - Edexcel - GCSE Biology - Question 1 - 2021 - Paper 1
Step 1
Which term is used to describe the American imported signal crayfish now that it is living in English rivers?
Answer
The American imported signal crayfish is referred to as a non-indigenous species because it is not native to the ecosystem of English rivers. Its introduction may lead to ecological imbalances.
Step 2
Explain one other reason why the increasing population of American imported signal crayfish may have caused the decrease in white-clawed crayfish.
Answer
Another reason for the decline of white-clawed crayfish is competition for resources. The American imported signal crayfish can outcompete the native species for food and habitat, leading to a reduction in the population of white-clawed crayfish due to limited resources.