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What Works in Conservation 2021

 | 
William Junior Sutherland
, 
Lynn V. Dicks
, 
Silviu O. Petrovan
, 
et al.

14. Marine and freshwater mammal conservation

14.3 Threat: Transportation and service corridors

Texte intégral

14.3.1 Shipping lanes

Likely to be beneficial

Set and enforce vessel speed limits

1Two studies evaluated the effects on marine and freshwater mammals of setting and enforcing vessel speed limits. One study was in the Indian River estuarine system (USA) and the other in the North Atlantic Ocean (USA). COMMUNITY RESPONSE (0 STUDIES)

2POPULATION RESPONSE (2 STUDIES)

3Survival (2 studies): One before-and-after study in the Indian River estuarine system found similar numbers of manatee deaths before and after vessel speed limits were set in ‘zones’, but fewer deaths were recorded after speed limits were set and enforced in all areas. One before-and-after study in the North Atlantic Ocean found that setting vessel speed limits during specific periods in key habitats resulted in fewer North Atlantic right whale deaths caused by collisions.

4BEHAVIOUR (0 STUDIES)

5Assessment: likely to be beneficial (effectiveness 80 %; certainty 60 %; harms 0 %).

https://www.conservationevidence.com/​actions/​2777

No evidence found (no assessment)

6We have captured no evidence for the following interventions:

  • Develop and implement regulations for operating vessels around mammals

  • Divert shipping routes

  • Limit vessel traffic in shallow rivers

  • Modify vessels to reduce risk of physical injury to mammals

  • Provide educational materials at marinas and ports to encourage vessel operators to carry out safe practices around mammals (e.g. signs, leaflets)

  • Provide training to vessel operators on mammal behaviour and appropriate avoidance techniques

  • Reduce shipping along inland waterways

  • Use acoustic devices on moving vessels

  • Use observers on board vessels to detect mammals and allow vessel course or speed to be altered

  • Use real-time automated tools on board vessels to detect mammals and allow vessel course or speed to be altered

  • Use remote tools to detect mammals in an area and allow vessel course or speed to be altered.

14.3.2 Flight paths

No evidence found (no assessment)

7We have captured no evidence for the following interventions:

8• Introduce regulations for flying aircraft over marine and freshwater mammals.

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