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Marine Ecosystems: An Overview

Earth's Largest Biome

Marine ecosystems represent the largest of Earth's aquatic environments, covering over 70% of the planet's surface. They account for more than 97% of Earth's water supply and provide over 90% of its habitable space. Unlike freshwater ecosystems, marine waters are characterized by a high salt content, typically averaging 35 parts per thousand, though this varies across different marine systems.

Zones and Divisions

These vast systems are segmented based on depth and proximity to shorelines. Key zones include the expansive oceanic zone (home to whales and sharks), the benthic zone (the seafloor substrate supporting invertebrates), and the intertidal zone (the area between high and low tides). Near-shore environments encompass diverse habitats like mudflats, seagrass meadows, mangroves, rocky shores, salt marshes, coral reefs, kelp forests, and lagoons.

Biodiversity Hotspots

Marine ecosystems host an extraordinary array of life, from microscopic phytoplankton and zooplankton to large marine animals. They are characterized by complex biological communities interacting with their physical environment. Notable inhabitants include brown algae, dinoflagellates, corals, cephalopods, echinoderms, and sharks, among countless others.

Diverse Marine Habitats

Coral Reefs

Renowned for their immense biodiversity, coral reefs like the Great Barrier Reef are complex ecosystems built by coral colonies. They foster numerous symbiotic relationships and provide critical habitats, rivaling seagrass meadows in ecological importance.

Mangroves

Found in tropical and subtropical coastal regions, mangroves are trees and shrubs adapted to low-oxygen, saline soils. Their dense root systems protect coastlines from erosion, and they serve as highly productive ecosystems, sequestering significant amounts of carbon dioxide.

Seagrass Meadows

These underwater meadows are among the most productive ecosystems globally, offering vital habitats and food sources for diverse marine life, including commercially important species and endangered animals. They also contribute to coastal protection and carbon sequestration.

Kelp Forests

Found in temperate and polar coastal oceans, kelp forests provide unique habitats and are crucial for understanding ecological processes. However, they are threatened by overfishing and climate change, leading to degradation and the emergence of barren landscapes.

Lagoons

Separated from larger bodies of water by barriers like reefs or sandbars, lagoons vary greatly in salinity and temperature. They are diverse habitats supporting numerous species and providing valuable economic services, including fisheries and flood protection.

Salt Marshes

Acting as transition zones between land and sea, salt marshes feature soils rich in organic matter. They are highly productive, supporting crucial fishery species, protecting shorelines, and influencing nutrient cycling, despite often having low-oxygen conditions.

Intertidal Zones

These dynamic areas are exposed during low tide and submerged during high tide. They are divided into distinct zones (spray, high, middle, low), each supporting resilient wildlife adapted to fluctuating conditions like barnacles, snails, and crabs.

Ocean Surface

The uppermost layer of the ocean hosts unique communities, including neuston (free-living organisms like Sargassum seaweed) and aeroplankton. This sun-drenched habitat connects various ecosystems but is also on the front line of climate change and pollution impacts.

Deep Sea & Seafloor

Occupying the vast majority of Earth's living space, the deep sea and seafloor remain largely unexplored. These environments contain a significant portion of the planet's biomass and harbor unique organisms adapted to extreme conditions.

Life in the Marine Realm

Marine Organisms

Marine ecosystems teem with life, encompassing a vast range of species. These include foundational organisms like brown algae and phytoplankton, diverse invertebrates such as corals and echinoderms, and larger fauna like cephalopods and sharks. The health and diversity of these populations are indicators of the ecosystem's overall well-being.

Neustonic Communities

The ocean surface harbors unique communities, termed neuston, which include organisms living freely at the surface. These communities, often associated with floating debris or seaweed like Sargassum, play a crucial role in connecting disparate marine habitats, despite facing significant threats from pollution and climate change.

Benthic Life

The benthic zone, encompassing the seafloor, supports a distinct array of life, primarily invertebrates. These organisms are adapted to varying pressures, temperatures, and nutrient availability, forming the base of many deep-sea food webs.

Large Marine Ecosystems (LMEs)

Defining LMEs

Large Marine Ecosystems (LMEs) are ecologically distinct regions, typically covering extensive areas like continental shelves. Identified by characteristics such as bathymetry, hydrography, and productivity, they encompass coastal zones from river basins to the outer shelf margins.

Economic Significance

The 66 recognized LMEs worldwide are crucial economic assets, contributing significantly to global fisheries. They are estimated to generate trillions of dollars annually and are responsible for approximately 90% of the global marine fishery biomass, highlighting their importance for food security and livelihoods.

Management & Conservation

Recognizing the transnational nature of LMEs and the threats they face (overfishing, habitat degradation, pollution), international cooperation is vital. Concepts like ecosystem-based management and the establishment of marine protected areas are key strategies for conservation and sustainable utilization, often supported by global initiatives.

Vital Ecosystem Services

Climate and Water Regulation

Marine ecosystems play a fundamental role in regulating the global climate and the water cycle. They absorb vast amounts of carbon dioxide and heat, influencing weather patterns and atmospheric composition, thereby mitigating the effects of climate change.

Provisioning Resources

These ecosystems are primary sources of food and economic resources for billions of people. They support extensive capture fisheries and aquaculture operations, providing essential protein and generating significant employment and revenue globally.

Supporting and Cultural Benefits

Marine environments provide crucial supporting services like nutrient cycling and habitat provision. They also offer significant cultural benefits, including opportunities for recreation, tourism, education, and spiritual enrichment, contributing to human well-being.

Threats to Marine Ecosystems

Overexploitation and Habitat Loss

Unsustainable fishing practices, including overfishing, are depleting fish stocks and altering marine food webs. Coastal habitats like mangroves and coral reefs are also declining rapidly due to human development, aquaculture, and industrialization.

Pollution Impacts

Marine pollution, predominantly from land-based activities, introduces harmful substances like plastics, chemicals, and excess nutrients into the ocean. This pollution damages marine life, degrades habitats, and contributes to issues like ocean acidification and dead zones.

Climate Change Effects

Rising ocean temperatures, ocean acidification due to increased CO2 absorption, and more frequent extreme weather events pose severe threats. These changes cause coral bleaching, alter species distribution, disrupt marine food webs, and impact overall ecosystem health.

Invasive Species

The introduction of non-native species, often facilitated by global trade through mechanisms like ballast water transport and aquaculture, can disrupt native ecosystems. These invasive species can outcompete native organisms, alter food webs, and introduce diseases.

Global Conservation Goals

Sustainable Development Goal 14

Recognizing the critical importance of oceans, the international community has prioritized Sustainable Development Goal 14: "Life Below Water." This goal aims to conserve and sustainably use oceans, seas, and marine resources for sustainable development.

Ecosystem Restoration Decade

The United Nations has declared 2021-2030 the UN Decade on Ecosystem Restoration. While this initiative aims to revive ecosystems globally, the restoration of vital coastal marine habitats requires focused attention and concerted effort.

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References

References

  1.  Ritchie, Roser, Mispy, Ortiz-Ospina. "Measuring progress towards the Sustainable Development Goals. SDG 14" SDG-Tracker.org, website (2018).
  2.  Graham, M.H., B.P. Kinlan, L.D. Druehl, L.E. Garske, and S. Banks. 2007. Deep-water kelp refugia as potential hotspots of tropical marine diversity and productivity. Proceedings of the National Academy of Sciences 104: 16576-16580.
  3.  Jackson, G.A. and C.D. Winant. 1983. Effect of a kelp forest on coastal currents. Continental Shelf Report 2: 75-80.
  4.  Sala, E., C.F. Bourdouresque and M. Harmelin-Vivien. 1998. Fishing, trophic cascades, and the structure of algal assemblages: evaluation of an old but untested paradigm. Oikos 82: 425-439.
  5.  Dayton, P.K. 1985a. Ecology of kelp communities. Annual Review of Ecology and Systematics 16: 215-245.
  6.  Norderhaug, K.M., Christie, H., 2009. Sea urchin grazing and kelp re-vegetation in the NE Atlantic. Marine Biology Research 5, 515-528
  7.  Living Bacteria Are Riding Earth's Air Currents Smithsonian Magazine, 11 January 2016.
  8.  Olsen SB, Sutinen JG, Juda L, Hennessey TM, Grigalunas TA. 2006. A Handbook on Governance and Socioeconomics of Large Marine Ecosystems. Kingston, RI: Coastal Resources Center, University of Rhode Island. 94 p.
  9.  Wang H. 2004. An evaluation of the modular approach to the assessment and management of large marine ecosystems. Ocean Development and International Law 35:267-286.
  10.  Juda L, Hennessey T. 2001. Governance profiles and the management of the uses of large marine ecosystems. Ocean Development and International Law 32:41-67.
  11.  Pauly D, Christensen V. 1995. Primary production required to sustain global fisheries. Nature 374:255-257.
  12.  Berman MS, Sherman K. 2001. A towed body sampler for monitoring marine ecosystems. Sea Technology 42(9):48-52.
  13.  Sutinen J, ed. 2000. A framework for monitoring and assessing socioeconomics and governance of large marine ecosystems. NOAA Technical Memorandum NMFS-NE-158:32p.
  14.  Duda, A.M.. 2005.Targeting development assistance to meet WSSD goals for large marine ecosystems and small island developing states. Ocean & Coastal Management 48:1014
A full list of references for this article are available at the Marine ecosystem Wikipedia page

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