Atlantic biogeographic region

Atlantic biogeographic region The Atlantic biogeographic region encompasses a broad swath of oceanic and coastal areas along the eastern seaboard of North America, the western coasts of Europe and northwest Africa, and associated island systems, forming a nexus for marine, coastal, and insular biotas. It links historic maritime routes such as Age of Discovery, Transatlantic Slave Trade, and Great Circle routes with contemporary institutions including the European Union, North Atlantic Treaty Organization, and United Nations frameworks that shape regional policy and research. Key ports and cities from New York City to Lisbon and Bermuda to Reykjavík anchor human use, while scientific programs like the International Council for the Exploration of the Sea and Marine Stewardship Council coordinate monitoring and standards.

Definition and extent

The region is defined by biogeographers and agencies such as the European Environment Agency, Convention on Biological Diversity, and national bodies like Fisheries and Oceans Canada through criteria that include species assemblages, oceanographic boundaries, and coastal geomorphology. Extent ranges from sub-Arctic waters adjacent to Greenland and Iceland through temperate shelves off Norway and France to subtropical margins near Senegal and the Canary Islands, and across to the continental margins bordering United States states like Maine and Florida. Jurisdictional interfaces involve international agreements such as the United Nations Convention on the Law of the Sea and regional fisheries organizations like the North West Atlantic Fisheries Organization.

Physical geography and oceanography

The physical template comprises continental shelves, abyssal plains, submarine canyons, and seamount chains influenced by major hydrographic features including the Gulf Stream, North Atlantic Drift, Labrador Current, and the Canary Current. Bathymetric highs like the Mid-Atlantic Ridge and features such as the Continental Shelf of the North Sea shape circulation, while sedimentary provinces reflect inputs from rivers like the Amazon River and Seine River as well as glacial legacies tied to events like the Last Glacial Maximum. Oceanographic processes interact with atmospheric systems studied by centers such as the National Oceanic and Atmospheric Administration and European Centre for Medium-Range Weather Forecasts.

Climate and seasonal patterns

Climate gradients span polar maritime climates around Iceland and Svalbard to Mediterranean-influenced conditions near Portugal and Morocco, modulated by phenomena documented by the Intergovernmental Panel on Climate Change and paleoclimate reconstructions from sites like Greenland Ice Sheet Project. Seasonal cycles govern productivity and migrations tied to events such as spring phytoplankton blooms observed off Nova Scotia and autumn overturns recorded near the Rockall Plateau. Extreme events—including storms traced to North Atlantic Oscillation variability and heatwaves linked to Atlantic Multidecadal Oscillation phases—affect coastal communities from Galway to Charleston, South Carolina.

Marine and coastal ecosystems

Ecosystems include kelp forests off Norway, deep-sea sponge grounds near the Porcupine Bank, seagrass meadows in embayments like the Bay of Biscay, and estuarine systems such as the Gironde estuary and Chesapeake Bay. Island habitats on Azores, Madeira, and Cape Verde host marine terraces and coral assemblages influenced by upwelling near Sahara-adjacent coasts. Biological productivity hotspots overlap fishing grounds exploited historically around Grand Banks and contemporary aquaculture sites near Scotland, with ecological interactions mediated by predators like Atlantic cod and migrants such as Sooty shearwater.

Biodiversity and endemism

Biodiversity spans planktonic communities sampled by programs like Continuous Plankton Recorder Survey to megafauna including North Atlantic right whale, Atlantic bluefin tuna, and populations of Atlantic puffin in archipelagos like Faroe Islands. Endemism is notable on islands—examples include endemic flora on Madeira and species-level differentiation in invertebrates around the Azores—while genetic studies by institutions such as the Smithsonian Institution and Natural History Museum, London reveal cryptic diversity among benthic taxa. Threatened taxa are listed by authorities including the International Union for Conservation of Nature and protected under instruments like the Bern Convention.

Human activities and impacts

Human uses include industrial fisheries regulated by agencies like International Commission for the Conservation of Atlantic Tunas, shipping lanes connecting hubs such as Rotterdam and Halifax, offshore energy developments near Dogger Bank and Gulf of Mexico platforms, and tourism centered on destinations like Biarritz and Bermuda. Impacts arise from overfishing as in the Collapse of the Atlantic northwest cod fishery, habitat loss from coastal urbanization in cities like Barcelona, pollution events similar to the Amoco Cadiz oil spill, and invasive species introductions via ports such as Lisbon. Climate-driven shifts documented by studies at Woods Hole Oceanographic Institution and Plymouth Marine Laboratory alter species ranges and socioeconomic stakes for fisheries communities in regions like Newfoundland and Labrador.

Conservation and management strategies

Conservation employs networks of marine protected areas established under initiatives like the Natura 2000 network and regional plans coordinated by the OSPAR Commission and bilateral agreements between States such as United Kingdom–France cooperation on cross-border conservation. Management tools include quota systems enforced by European Commission fisheries policy, spatial planning under frameworks influenced by Marine Spatial Planning Directive, and restoration projects modeled on efforts in the Baltic Sea and Galician coast. Research collaborations among universities such as University of Bergen, agencies like Fisheries and Oceans Canada, and NGOs such as Greenpeace and World Wildlife Fund advance adaptive management, while global policy drivers from the UN Decade of Ocean Science shape priorities.

Category:Biogeographic regions