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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

14.10 Habitat protection

Texte intégral

Likely to be beneficial

Cease or prohibit activities that cause disturbance in sensitive areas for marine and freshwater mammals

1Two studies evaluated the effects of prohibiting activities that cause disturbance in sensitive areas for marine mammals. One study was in the Kattegat Sea (Denmark) and one in the Indian Ocean (Australia).

2COMMUNITY RESPONSE (0 STUDIES)

3POPULATION RESPONSE (1 STUDY)

4Abundance (1 study): One before-and-after study in the Kattegat sea found that harbour porpoise activity increased at a stony reef after fishing was prohibited and the reef was restored with boulders.

5BEHAVIOUR (1 STUDY)

6Behaviour change (1 study): One site comparison study in the Indian Ocean found that a beach where human access was fully prohibited had fewer Australian sea lions showing aggression or retreating compared to a beach where access was partly prohibited.

7Assessment: likely to be beneficial (effectiveness 60 %; certainty 40 %; harms 0 %).

https://www.conservationevidence.com/​actions/​2917

Legally protect habitat for marine and freshwater mammals

8Four studies evaluated the effects of legally protecting habitat for marine and freshwater mammals. One study was in each of the North Atlantic Ocean (Portugal), the South Pacific Ocean (New Zealand), the North Sea (UK) and the Port River estuary (Australia).

9COMMUNITY RESPONSE (0 STUDIES)

10POPULATION RESPONSE (4 STUDIES)

11Abundance (2 studies): One before-and-after study in the North Atlantic Ocean found that a population of Mediterranean monk seals increased during eight years after the islands they inhabited were legally protected. One before-and-after study in the North Sea found that a population of bottlenose dolphins was estimated to be a similar size before and after part of its range was protected.

12Survival (2 studies): One before-and-after study in the South Pacific Ocean found that the survival rate of Hector’s dolphins was higher after a coastal area was legally protected than before. One before-and-after study in the Port River estuary found that after the area became legally protected a similar number of Indo-Pacific bottlenose dolphin strandings were recorded compared to before protection, but the number of strandings caused by humans decreased.

13BEHAVIOUR (0 STUDIES)

14Assessment: likely to be beneficial (effectiveness 70 %; certainty 60 %; harms 0 %).

https://www.conservationevidence.com/​actions/​2915

No evidence found (no assessment)

15We have captured no evidence for the following interventions:

  • Cease or prohibit activities that cause disturbance during sensitive periods for marine and freshwater mammals

  • Enforce existing legislation for habitat protection

  • Retain or create buffer zones around important habitats.

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