What is a marine protected area?

A marine protected area (MPA) is a designated section of ocean or estuarine environments managed with specific regulations. MPAs aim to conserve biodiversity while allowing sustainable human activities. They protect marine ecosystems from destructive practices like commercial fishing and mining, offering safe zones for various species. MPAs can be easier to establish than biosphere reserves because they are often located in areas without human populations, which minimizes disruption to livelihoods. Some MPAs are "no-take" zones, which prohibit harvesting or damaging activities, while others allow certain activities like recreation or community fishing. Studies show that highly protected marine areas lead to greater conservation benefits, such as increased biodiversity and fish populations, and they can also boost marine tourism and scientific research.

Why are marine protected areas important?

Marine protected areas (MPAs) safeguard ocean and estuarine ecosystems through special regulations. They counter destructive human activities like commercial fishing and mining, offering safe zones for various species and stabilizing ecosystems. MPAs can be easier to establish than biosphere reserves because they are often in areas without human populations, which minimizes disruption to livelihoods. Studies show that highly protected marine areas yield the greatest conservation benefits, such as increased biodiversity and fish populations, and they can become destinations for marine tourism and scientific research. MPAs can conserve biodiversity by creating safe havens that restrict or prohibit fishing.

How do marine protected areas help with conservation?

Marine Protected Areas (MPAs) safeguard ocean ecosystems by restricting destabilizing human activities like commercial fishing and mining. These MPAs act as safe zones for various species, helping to stabilize the structure of the ecosystems they inhabit. Studies reveal that MPAs with high protection levels lead to substantial conservation benefits, such as increased biodiversity and a reversal in the decline of fish populations. As of early 2020s, over 18,000 MPAs had been established, covering 8.2 percent of the world's oceans. For example, the Galapagos Marine Reserve (GMR) is a habitat for about 30 species of sharks.

What types of animals and plants can be protected in marine protected areas?

Marine Protected Areas (MPAs) aim to shield marine ecosystems from damaging human activities, such as commercial fishing and mining, creating safe zones for various species. These areas intend to protect predators and other important species within the MPA and nearby unprotected ecosystems, which helps stabilize the structure of the ecosystems they inhabit. Studies show that MPAs with high protection levels lead to greater conservation benefits, such as increased biodiversity and a reversal in the decline of fish populations. Some MPAs are "no-take" zones, which prohibit harvesting or damaging activities, while others allow certain activities like recreation or community fishing.

How are rules and activities controlled inside a marine protected area?

Marine protected areas (MPAs) are managed with special regulations to protect marine ecosystems from destructive human activities like commercial fishing, aquaculture, and mining. Some MPAs have "no-take" zones that prohibit harvesting or damaging activities, while others are managed as multiple-use zones, limiting certain activities but allowing others like recreation or community fishing. The High Seas Treaty helps conserve biodiversity by creating MPAs and conducting environmental impact assessments. Enforcement relies on country-level implementation, reporting, and a compliance committee. Each country adopts measures, monitors compliance, and reports to the Conference of the Parties. The Treaty also includes an Implementation and Compliance Committee for reviewing implementation, making recommendations, and resolving disputes.

What challenges do marine protected areas face in protecting ocean life?

Marine Protected Areas (MPAs) aim to conserve marine ecosystems by restricting damaging human activities such as commercial fishing , aquaculture, and mining. MPAs face challenges such as habitat loss , which is driven by commercial agriculture, infrastructure development, and logging. Additionally, overfishing poses a major threat to ocean biodiversity, with many fish stocks being overfished. MPAs can be affected by pollution, climate change , and invasive species .

marine protected area

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World map displaying marine protected areas in blue-green, highlighting regions in the Pacific, Atlantic, Indian, and Southern Oceans. Key areas such as the Galapagos Marine Reserve, Great Barrier Reef, and Papahanaumokuakea are labeled and listed below the map.

Map showing the Indo-Pacific region with major marine protected areas highlighted in purple across the Pacific and Indian Oceans. The map labels specific reserves such as the Great Barrier Reef Marine Park in Australia, the Galapagos Marine Reserve in Ecuador, and several U.S. national monuments and reserves, indicating their locations and relative sizes. Surrounding continents including Asia, Australia, North America, and South America are partially visible for geographic context.

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Related Topics:: conservation; Marine ecosystem; ocean; estuary; in situ conservation

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marine protected area

conservation

Also known as: MPA, marine reserve, marine sanctuary

Written by

John P. Rafferty

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Top Questions

What is a marine protected area?
A marine protected area (MPA) is a designated section of ocean or estuarine environments managed with specific regulations. MPAs aim to conserve biodiversity while allowing sustainable human activities. They protect marine ecosystems from destructive practices like commercial fishing and mining, offering safe zones for various species.

MPAs can be easier to establish than biosphere reserves because they are often located in areas without human populations, which minimizes disruption to livelihoods. Some MPAs are "no-take" zones, which prohibit harvesting or damaging activities, while others allow certain activities like recreation or community fishing. Studies show that highly protected marine areas lead to greater conservation benefits, such as increased biodiversity and fish populations, and they can also boost marine tourism and scientific research.
2 Britannica Sources
1. marine protected area
2. Saving Sharks in the 2020s
Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.
Why are marine protected areas important?
Marine protected areas (MPAs) safeguard ocean and estuarine ecosystems through special regulations. They counter destructive human activities like commercial fishing and mining, offering safe zones for various species and stabilizing ecosystems. MPAs can be easier to establish than biosphere reserves because they are often in areas without human populations, which minimizes disruption to livelihoods.

Studies show that highly protected marine areas yield the greatest conservation benefits, such as increased biodiversity and fish populations, and they can become destinations for marine tourism and scientific research. MPAs can conserve biodiversity by creating safe havens that restrict or prohibit fishing.
2 Britannica Sources
1. marine protected area
2. Saving Sharks in the 2020s
Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.
How do marine protected areas help with conservation?
Marine Protected Areas (MPAs) safeguard ocean ecosystems by restricting destabilizing human activities like commercial fishing and mining. These MPAs act as safe zones for various species, helping to stabilize the structure of the ecosystems they inhabit. Studies reveal that MPAs with high protection levels lead to substantial conservation benefits, such as increased biodiversity and a reversal in the decline of fish populations. As of early 2020s, over 18,000 MPAs had been established, covering 8.2 percent of the world's oceans. For example, the Galapagos Marine Reserve (GMR) is a habitat for about 30 species of sharks.
2 Britannica Sources
1. marine protected area
2. Saving Sharks in the 2020s
Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.
What types of animals and plants can be protected in marine protected areas?
Marine Protected Areas (MPAs) aim to shield marine ecosystems from damaging human activities, such as commercial fishing and mining, creating safe zones for various species. These areas intend to protect predators and other important species within the MPA and nearby unprotected ecosystems, which helps stabilize the structure of the ecosystems they inhabit. Studies show that MPAs with high protection levels lead to greater conservation benefits, such as increased biodiversity and a reversal in the decline of fish populations. Some MPAs are "no-take" zones, which prohibit harvesting or damaging activities, while others allow certain activities like recreation or community fishing.
1 Britannica Source
1. marine protected area
Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.
How are rules and activities controlled inside a marine protected area?
Marine protected areas (MPAs) are managed with special regulations to protect marine ecosystems from destructive human activities like commercial fishing, aquaculture, and mining. Some MPAs have "no-take" zones that prohibit harvesting or damaging activities, while others are managed as multiple-use zones, limiting certain activities but allowing others like recreation or community fishing.

The High Seas Treaty helps conserve biodiversity by creating MPAs and conducting environmental impact assessments. Enforcement relies on country-level implementation, reporting, and a compliance committee. Each country adopts measures, monitors compliance, and reports to the Conference of the Parties. The Treaty also includes an Implementation and Compliance Committee for reviewing implementation, making recommendations, and resolving disputes.
2 Britannica Sources
1. marine protected area
2. High Seas Treaty: Purpose and enforcement mechanisms
Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.
What challenges do marine protected areas face in protecting ocean life?
Marine Protected Areas (MPAs) aim to conserve marine ecosystems by restricting damaging human activities such as commercial fishing, aquaculture, and mining. MPAs face challenges such as habitat loss, which is driven by commercial agriculture, infrastructure development, and logging. Additionally, overfishing poses a major threat to ocean biodiversity, with many fish stocks being overfished. MPAs can be affected by pollution, climate change, and invasive species.
3 Britannica Sources
Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

marine protected area (MPA), discrete parcel of ocean or estuarine ecosystems that is managed according to special regulations. Marine protected areas (MPAs), which are also known as marine reserves or marine sanctuaries, are—like their terrestrial counterparts, biosphere reserves—set-asides designed to balance biodiversity conservation with sustainable use by human beings. In addition, they are often created to provide an umbrella of protection from different types of human activities for the species that reside within them and those that live in nearby unprotected ecosystems. By the early 2020s more than 18,000 MPAs had been established that together cover 8.2 percent of the world ocean. In the United States, protected freshwater environments in the Great Lakes are also included in the country’s marine protected area inventory.

The purpose of an MPA is to protect marine ecosystems from some of the most destructive and destabilizing human activities, such as commercial fishing, aquaculture, mining, and other forms of intensive economic development. By prohibiting or restricting these activities, each MPA serves as a retreat or a safe zone for predators and other important species that live both within the MPA and in nearby areas, which helps to reinforce and stabilize the structure of the ecosystems they inhabit. MPAs are often easier to designate than biosphere reserves since they occur in parts of the world devoid of people, so siting them results in minimal disruption to people’s lives and livelihoods. Some MPAs or specific areas within them may be designated as “no-take” zones, which prohibit any form of harvesting or other damaging activity. Other MPAs, however, may be governed by different rules, some managed as multiple-use zones that may limit certain activities (such as intensive commercial fishing) while allowing others (such as recreation or fishing by members of nearby communities).

Studies have shown that marine areas with the highest levels of protection provide the greatest conservation benefits, such as high levels of biodiversity, a decrease—or even a reversal—in the decline of fish populations, and an increase in an area’s profile as a destination for marine tourism and scientific research. A 2014 study of 87 marine protected areas found that an MPA’s conservation benefits increase substantially when it is large (greater than 100 square km [38.6 square miles]), remote, at least 10 years old, and managed as a no-take parcel with well-enforced rules.

Researchers and policymakers expect that commercial fishing, aquaculture, mining, petroleum and natural gas extraction, offshore wind power, and other ocean-borne energy projects will increase dramatically throughout the 21st century, along with the effects of climate change. With that in mind, several governments around the world in 2010 pledged to protect 10 percent of the world ocean by 2020. Although scientists determined that this level of protection was not sufficient to safeguard the critical benefits that a healthy ocean provides, massive areas of ocean were set aside during the middle part of the decade. The largest push came in 2014 and 2015, when the governments of Chile, New Zealand, Palau, the United Kingdom, and the United States designated more than 3,000,000 square km (about 1,158,300 square miles) of ocean as MPAs. This was followed in 2016 by the creation of the Ross Sea region, an MPA in the Southern Ocean spanning more than 2,000,000 square km (nearly 788,200 square miles) and the expansion of the Papahānaumokuākea Marine National Monument to 1,508,870 square km (582,578 square miles) in the central Pacific Ocean. Although representatives of 193 countries met in early 2023 and voted to adopt the Treaty of the High Seas, which raised protection targets to 30 percent of the world ocean by 2030, only 10 percent of the world ocean was covered by MPAs by the mid 2020s.

John P. Rafferty

marine protected area

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