plastic debris beached on three coral reef islands in the indian ocean

K. Minnaar 1 *, H. Bouwman 1 & R. Choong Kwet Yive 2 1 North-West University, Potchefstroom, South Africa 2 University of Mauritius, Mauritius Plastic debris beached on three coral reef islands in the Indian Ocean

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Page 1: Plastic debris beached on three coral reef islands in the Indian Ocean

K. Minnaar1*, H. Bouwman1 & R. Choong Kwet Yive2

1North-West University, Potchefstroom, South Africa2University of Mauritius, Mauritius

Plastic debris beached on three coral

reef islands in the Indian Ocean

Plastics

Page 3: Plastic debris beached on three coral reef islands in the Indian Ocean

Why are they such big concern?

Page 4: Plastic debris beached on three coral reef islands in the Indian Ocean

Page 5: Plastic debris beached on three coral reef islands in the Indian Ocean

Science 2015

Page 6: Plastic debris beached on three coral reef islands in the Indian Ocean

Raising awareness

Page 7: Plastic debris beached on three coral reef islands in the Indian Ocean

Aim

• To investigate the presence and composition

of stranded marine debris on the shores of

three remote Mascerene islands

• To determine the spatial concentration

variations between up- and down-current

shores of each island; as well as the

differences between the islands

Page 8: Plastic debris beached on three coral reef islands in the Indian Ocean

Sampling sites

Page 9: Plastic debris beached on three coral reef islands in the Indian Ocean

Sampling sites

Agalega

St Brandon's Rock

Rodrigues

Mauritius

Reunion

20S 80E

200 km

Page 10: Plastic debris beached on three coral reef islands in the Indian Ocean

Page 11: Plastic debris beached on three coral reef islands in the Indian Ocean

Plastic transects

+/- 100 m

Page 12: Plastic debris beached on three coral reef islands in the Indian Ocean

Previous study

Page 13: Plastic debris beached on three coral reef islands in the Indian Ocean

Page 14: Plastic debris beached on three coral reef islands in the Indian Ocean

Results

Page 15: Plastic debris beached on three coral reef islands in the Indian Ocean

Results

Page 16: Plastic debris beached on three coral reef islands in the Indian Ocean

Results

F1: Nonmetric multidimensional scaling (NMS) of the debris deposits on the up-current

(red) and down-current (green) aspects of Rodrigues

Page 17: Plastic debris beached on three coral reef islands in the Indian Ocean

Results

F2: The up-current (red) and down-current (green) beached debris on Agalega (NMS)

Page 18: Plastic debris beached on three coral reef islands in the Indian Ocean

Results

F3: Differences in debris deposits on the up-current (red) and down-current (green)

aspects of St. Brandon's Rock (NMS)

Page 19: Plastic debris beached on three coral reef islands in the Indian Ocean

Results

F4: Variations in composition and concentration of beached debris on Rodrigues (red),

Agalega (green), and SBR (blue)

Page 20: Plastic debris beached on three coral reef islands in the Indian Ocean

Conclusion

• Most common debris on all three islands:

– Plastic fragments

– Plastic bottles

– Bottle caps

• Large influx of debris from distant locations,

potentially hazardous to local ecosystems

• Large number of flip flops, and RB bottles indicate

possible origin of pollution on Aga and SBR

• SBR is the most vulnerable

• Interventions possible on Agalega, and has already

started on Rodrigues.

Page 21: Plastic debris beached on three coral reef islands in the Indian Ocean

Future studies

• Investigate the presence of microplastic

particles on and around the Mascarene

islands

THANK YOU

Page 23: Plastic debris beached on three coral reef islands in the Indian Ocean

• Special thank you to:

– PETCO (Sherry Scholtz)

– Plastics SA (John Kieser)

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