Other effective area-based conservation measures (OECMs) are sites outside of protected areas that are governed and managed in ways that deliver the long-term in situ conservation of biodiversity. As of July 2022, 785 such sites have been reported to the World Database on Other Effective Area-based Conservation Measures, managed by the UN Environment Programme World Conservation Monitoring Centre. OECMs cover 1,818,430 km2 (702,100 sq mi) of the Earth’s surface, accounting for 1,498,111 km2 (578,424 sq mi) on land and 320,319 km2 (123,676 sq mi) in the ocean.
An (OECM) is defined by the Convention on Biological Diversity as:
[A] geographically defined area other than a Protected Area, which is governed and managed in ways that achieve positive and sustained long-term outcomes for the in situ conservation of biodiversity, with associated ecosystem functions and services and where applicable, cultural, spiritual, socio–economic, and other locally relevant values.[1]
There are four criteria for identifying OECMs:
Under the four criteria above, there are 26 sub-criteria.[2]
The term "other effective area-based conservation measures" was first used in Target 11 of the Convention on Biological Diversity’s Strategic Plan for Biodiversity, [3] agreed to in Nagoya, Japan, in 2010. Target 11 stated:
By 2020, at least 17 per cent of terrestrial and inland water areas and 10 per cent of coastal and marine areas, especially areas of particular importance for biodiversity and ecosystem services, are conserved through effectively and equitably managed, ecologically representative and well connected systems of protected areas and other effective area-based conservation measures, and integrated into the wider landscapes and seascapes. (Emphasis added)[4]
In 2014, Harry Jonas, Ashish Kothari and other authors affiliated with the ICCA Consortium – ICCA stands for "Indigenous and Community Conserved Area" – argued that “defining ‘other effective area-based conservation measures’ offers a unique opportunity to better recognize areas that deliver the conservation of biodiversity outside of protected areas.”[5] In 2015, the International Union for Conservation of Nature World Commission on Protected Areas established a Task Force, co-chaired by Harry Jonas and Kathy MacKinnon (2016-2020),[6] to provide technical advice to the Convention on Biological Diversity. It submitted its advice to the Secretariat of the Convention on Biological Diversity in January 2018.[7] That advice, together with a report on marine OECMs,[8] was considered at two workshops hosted by the Secretariat of the Convention on Biological Diversity in February 2018.[9]
Parties to the Convention on Biological Diversity negotiated a draft decision at the 22nd meeting of the Subsidiary Body on Scientific, Technical and Technological Advice,[10] and adopted Decision 14/8 on ‘Protected areas and other effective area-based conservation measures’ at the 14th meeting of the Conference of the Parties, which contains the definition and criteria for identifying OECMs.[11]
‘Other effective area-based conservation measures’ are referenced in Target 3 of the draft Global Biodiversity Framework. The Framework is due to be discussed at the 15th Conference of the Parties to the UN Convention on Biological Diversity in Montreal, Canada.[12][13] Integration of OECMs into global biodiversity targets has been a topic of discussion in the lead-up to the conference.[14][15]
The World Database on Other Effective Area-based Conservation Measures[16] is managed by the UN Environment Programme World Conservation Monitoring Centre. As of July 2022, 785 sites have been reported to the World Database. OECMs cover 1,818,430 km2 (702,100 sq mi) of the Earth’s surface, accounting for 1,498,111 km2 (578,424 sq mi) on land and 320,319 km2 (123,676 sq mi) in the ocean.[17]
Locally managed marine areas (LMMAs) are one form of OECM; examples of these exist in Mozambique and Madagascar.[18]
Protected areas and OECMs are distinct but complementary within landscapes, seascapes and river basins. Protected areas have a primary conservation objective, i.e., they are areas dedicated to the conservation of biodiversity and managed accordingly. In contrast, OECMs do not need to be dedicated to the conservation of nature but must deliver the effective and long-term in situ conservation of biodiversity. OECMs can deliver long-term in situ conservation through ancillary conservation, secondary conservation, and sometimes primary conservation in places that cannot, or will not, be recognized as protected areas.[19]
OECMs are intended to take a more inclusive approach to biodiversity conservation that traditional protected areas, by permitting some small-scale area management. This is achieved by accounting for the needs of other rights holders such as small scale fisheries and low-impact agroforestry. Traditional protected areas have attracted controversy over Indigenous rights and displacement; OECMs are intended to be more equitable to human needs.[20][15]