Northern Map Turtle Injuries Reach 7%, with Jet Ski Propellers as the Main Threat

Propellers pose a significant threat to marine and freshwater animals, causing both direct physical harm and indirect disturbances. The high-speed rotation of propellers can lead to severe injuries or death for animals that come into contact with them. For instance, large marine mammals like whales and dolphins are often injured or killed when they are struck by the blades of ship propellers. The impact can be devastating, as the blades can cut through their skin and flesh, causing deep lacerations and internal injuries. Even smaller animals, such as turtles and fish, are not immune to these dangers. The propellers can easily slice through their bodies, leading to fatal injuries.

Examples from iNaturalist Canada of Northem Map Turtles (Graptemys geographica) with injuries consistent with propeler strikes. (Photographed by Peter Stranberg, A； Josh Vandermeulen, B； Pauline Catling, C； and Mike Leveille, D).

The Northern Map Turtle (Graptemys geographica), known for its map-like shell patterns, faces significant survival threats, particularly from motorboat propellers. A study using iNaturalist Canada data showed injury rates of 4.0% to 7.0% across different regions, with injuries mainly occurring when turtles surface. These injuries, often deep cuts or V-shaped notches, are concentrated on the rear of the shell and are more common in females due to their wider activity range. Such injuries can weaken reproductive capacity, affecting population survival. Similar threats exist for other marine species like dolphins, turtles, and whales, with whale shark injury rates rising from 15% to over 50% due to propellers.


5 Northem Map Turtles (Graptemys geographica)  | Credit: D. Gordon E. Robertson（CC BY-SA 3.0）

To reduce the harm caused by propellers, several measures can be implemented. Firstly, the mandatory installation of propeller guards on boats operating in sensitive habitats is crucial. These guards can significantly reduce the risk of direct physical harm to animals while maintaining the vessel's operational efficiency. In addition, establishing a ban on open propeller boats entering key habitats through legislation and regulations can provide safe havens for these species, allowing them to thrive without the threat of propeller impact.

Credit: D. Gordon E. Robertson。（CC BY-SA 3.0）

Secondly, raising public awareness about the dangers of open propellers is essential. Educational campaigns can inform boat owners and operators about the potential harm their equipment can cause and encourage them to adopt safer practices. This could include promoting the use of propeller guards and adhering to speed limits in areas known to be frequented by vulnerable species.

A sea turtle killed by propellers. © Photography by Khalid Zaki | Photo provided by Prof. John MK Wong

Furthermore, fostering collaboration between environmental organizations, maritime authorities, and local communities can lead to the development of comprehensive regulations and guidelines. These partnerships can ensure that protective measures are effectively enforced and that ongoing research is conducted to monitor the impact of these initiatives on wildlife populations.

 

Lastly, supporting research into innovative technologies that can further minimize the risk of propeller-related injuries is essential. This could involve developing more advanced propeller designs or alternative propulsion systems that are less harmful to aquatic life. By combining these efforts, we can work towards creating a safer environment for marine and freshwater species, ensuring their long-term survival and the preservation of biodiversity.

 

Original Link: https://mp.weixin.qq.com/s/lAEJl0NDQ-SQiBq_ikSEcQ

Translator: Richard

Checked by Maggie

Editor: Richard

Contact: v10@cbcgdf.org; +8617319454776


 

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