Assessment of the benthic environment following offshore placer gold mining in the northeastern Bering Sea

  • Published source details Jewett S.C., Feder H.M. & Blanchard A. (1999) Assessment of the benthic environment following offshore placer gold mining in the northeastern Bering Sea. Marine Environmental Research, 32.


This study is summarised as evidence for the following.

Action Category

Cease or prohibit marine mining

Action Link
Subtidal Benthic Invertebrate Conservation
  1. Cease or prohibit marine mining

    A site comparison study in 1986–1993 of two sites of mixed seabed in the northeastern Bering Sea, Alaska, USA (Jewett & Blanchard 1999) found that ceasing gold mining at a site led to invertebrate community composition, biomass, abundance, taxa richness and diversity becoming similar to that of an unmined site, after three to five years depending on the sediment type. Community composition at the mined site had become more similar to that of the unmined site after four to five years in sandy sediments, and three years in cobbly sediments (presented as graphical analyses). In sands, invertebrate biomasses were similar to unmined sites after four years, and abundances, number of taxa and diversities were similar after five years (richness mined: 27, unmined: 33; see study for biomass, abundance and diversity data). In cobbles after three years, mined and unmined sites had similar invertebrate biomasses, abundances, number of taxa (mined: 29, unmined: 39), and diversities. An area was mined for gold in June–November 1986. Yearly in 1987–1991 and in 1993, one site in the mined area and one unmined site approximately 10 km away were surveyed. Each site had areas of sandy and areas of cobbly sediments. During each survey, divers collected three samples/sediment type/site using a suction sampler (0.1 m2, 10 cm depth). Invertebrates (>1 mm) were identified, counted and wet-weighed.

    (Summarised by: Anaëlle Lemasson)

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 21

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 ProgrammeRed List Champion - Arc Kent Wildlife Trust The Rufford Foundation Save the Frogs - Ghana Mauritian Wildlife Supporting Conservation Leaders
Sustainability Dashboard National Biodiversity Network Frog Life The international journey of Conservation - Oryx Cool Farm Alliance UNEP AWFA Bat Conservation InternationalPeople trust for endangered species Vincet Wildlife Trust