SEABIRD BYCATCH
Many species of seabirds are facing the risk of extinction - NSC Marine Sciences - Question 2 - 2022 - Paper 2
Question 2
SEABIRD BYCATCH
Many species of seabirds are facing the risk of extinction. Large numbers of birds have been caught as bycatch by long-line fisheries.
Long-li... show full transcript
Worked Solution & Example Answer:SEABIRD BYCATCH
Many species of seabirds are facing the risk of extinction - NSC Marine Sciences - Question 2 - 2022 - Paper 2
Step 1
State the aim of this investigation.
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Answer
The aim of the investigation is to determine the impact of fishing practices on seabird populations by assessing the number and species of seabirds captured as bycatch.
Step 2
Identify TWO controlled variables mentioned in the text for the investigation.
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The use of long-line fishing method.
The similarity in size of the fishing vessels.
Step 3
Construct a pie chart to illustrate the proportions of birds caught by each fishing vessel. Use the total number of birds caught per vessel. Show ALL calculations.
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To construct the pie chart, first calculate the total number of birds caught by each vessel:
Heart of the Sea: 11 birds
Marlin I: 36 birds
Aqua-Bell: 43 birds
Shy Shark II: 57 birds
The total number of birds caught is 147.
Next, calculate the percentage for each vessel:
Heart of the Sea: ( \frac{11}{147} \times 100 \approx 7.48% )
Shy Shark II: ( \frac{57}{147} \times 100 \approx 38.76% )
The pie chart will show these proportions visually.
Step 4
Why would data, such as that found in the table above, be considered as important for ecologists?
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Data like this is vital for ecologists as it helps in understanding the effects of fishing on seabird populations, informs conservation efforts, and aids in the formulation of regulations to protect endangered species.
Step 5
How can fisheries lead to the extinction of bird species?
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Fisheries can lead to the extinction of bird species by reducing their food supply, increasing bycatch, and disrupting their breeding grounds, ultimately impacting their population dynamics.
Step 6
(a) Which vessel in the table does NOT comply with these international regulations?
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The vessel 'Shy Shark II' does not comply with the international regulations since it has caught 57 seabirds.
Step 7
(b) Suggest a mitigation measure to reduce bycatch in order for this fishing vessel to comply with the international regulations.
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One possible mitigation measure is to implement bird-scaring lines that deter seabirds from approaching the baited hooks, significantly reducing the likelihood of bycatch.
