Study

Long-term trends in the use of a protected area by small cetaceans in relation to changes in population status

  • Published source details Cheney B., Corkrey R., Durban J.W., Grellier K., Hammond P.S., Islas-Villanueva V., Janik V.M., Lusseau S.M., Parsons K.M., Quick N.J., Wilson B. & Thompson B.M. (2014) Long-term trends in the use of a protected area by small cetaceans in relation to changes in population status. Biological Conservation, 2, 118-128.

Actions

This study is summarised as evidence for the following.

Action Category

Legally protect habitat for marine and freshwater mammals

Action Link
Marine and Freshwater Mammal Conservation
  1. Legally protect habitat for marine and freshwater mammals

    A before-and-after study in 1990–2010 in an inlet of the North Sea, Scotland, UK (Cheney et al. 2014) reported that after the area was protected, the resident population of bottlenose dolphins Tursiops truncatus was estimated to be of a similar size to before protection. The total bottlenose dolphin population was estimated to be 102–157 individuals/year during the 15 years before the area was protected, and 143–178 individuals/year during the six years after, although the difference was not tested for statistical significance. Overall, the population was estimated to be stable or increasing over the entire 21-year period. In 2005, part of the bottlenose dolphin population’s range was designated as a protected area. In May–September 1990–2010, the area was surveyed during 10–39 boat surveys/year along fixed (1990–2000) or flexible routes (2001–2010). All dolphins encountered were recorded and photographs were taken of the left and right side of their dorsal fins. Annual abundance and population trends were estimated using sightings of distinctive individuals (26–92 individuals/year) and mark-recapture models.

    (Summarised by: Anna Berthinussen)

Output references
What Works 2021 cover

What Works in Conservation

What Works in Conservation provides expert assessments of the effectiveness of actions, based on summarised evidence, in synopses. Subjects covered so far include amphibians, birds, mammals, forests, peatland and control of freshwater invasive species. More are in progress.

More about What Works in Conservation

Download free PDF or purchase
The Conservation Evidence Journal

The Conservation Evidence Journal

An online, free to publish in, open-access journal publishing results from research and projects that test the effectiveness of conservation actions.

Read the latest volume: Volume 18

Go to the CE Journal

Discover more on our blog

Our blog contains the latest news and updates from the Conservation Evidence team, the Conservation Evidence Journal, and our global partners in evidence-based conservation.


Who uses Conservation Evidence?

Meet some of the evidence champions

Endangered Landscape Programme Red List Champion - Arc Kent Wildlife Trust The Rufford Foundation Save the Frogs - Ghana Bern wood Supporting Conservation Leaders National Biodiversity Network Sustainability Dashboard Frog Life The international journey of Conservation - Oryx British trust for ornithology Cool Farm Alliance UNEP AWFA Butterfly Conservation People trust for endangered species Vincet Wildlife Trust