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Marine Ecoregions of North America

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Marine Ecoregions of North America 22. Alaskan/Fjordland Pacific Level II seafloor geomorphological regions include: 22.1 Alaskan/Fjordland Shelf 22.2 North Pacific Slope 22.3 Aleutian Trench 22.4 North Pacific Basin Level III coastal regions include: 22.1.1 Fjordland Estuarine Areas 22.1.2 Fjordland Neritic 22.1.3 Gulf of Alaska 22.1.4 Cook Inlet Regional Overview Physical and Oceanographic Setting The Alaskan/Fjordland Pacific Region is a binational region, The Alaskan/Fjordland Pacific Region encompasses all of the fjord- home to abundant plant and wildlife. The region encompasses a dominated west coast of British Columbia and the Alaska Panhandle, multitude of islands, deep fjords, sheltered straits and many of the and runs out to sea over the North Pacific Slope and Basin. Its world’s gazetted seamounts. Its adjacent rivers carry a tremen- numerous islands, deep fjords, and sheltered straits, as well as dous amount of freshwater runoff and nutrients, while upwelling the great amount of freshwater runoff from its numerous rivers, in the center of the Alaska Gyre pushes nutrients, phytoplankton distinguish the southern portion of the region. The shelf of the and zooplankton production onto its shelf. The region straddles Fjordland varies, but is generally narrow throughout—it extends Vancouver Island, starting at Cape Cook on the west side and the about 20 km at the north end of Vancouver Island, is almost Strait of Georgia on the east. It continues north through the Gulf of imperceptible at the southern end of Queen Charlotte Islands, Alaska and extends to the end of the Aleutian Archipelago Region, and broadens again as it moves north into the Gulf of Alaska, running south and west of that region. The region includes eight where it is about 160 km wide. The deeper waters of the region B2B Marine Priority Conservation Areas (PCAs): PCA 5-Western include over five percent of the world’s gazetted seamounts. Kodiak Island/Shelikof Strait; PCA 6-Lower Cook Inlet/Eastern Kodiak Island; PCA 7-Prince William Sound/Copper River Delta; The major oceanographic influence on the region is the Alaska PCA 8-Patton Seamounts; PCA 9-Glacier Bay/Sitka Sound/Fred- Current, which is formed when the westerly North Pacific Cur- rick Sound; PCA 10-Dixon Entrance/Langara Island/Forrester rent (West Wind Drift) bifurcates at Vancouver Island, splitting Island; PCA 11-Northern Queen Charlotte Sound/Hecate Strait/ into the northerly, counterclockwise-directed Alaska Current and Gwaii Haanas; and PCA 12-Scott Islands/Queen Charlotte Strait the southerly California Current. The Alaska Current continues (Morgan et al. 2005).24 along the southern edge of the Aleutian Islands as the Alaska Stream, and a parallel, low-salinity Alaska Coastal Current flows 24 See footnote 6 (p.11). close to the coast from British Colombia to Unimak Pass. Based 125 The large invertebrate populations provide rich food sources for Fact Sheet the 306 species of fishes living in the region. The Pacific herring Rationale: separated from the Columbian Region by the bifurcation of the North Pacific Current to is the most abundant, while steelhead, dolly varden, Pacific cod, form the cooler Alaska Current walleye pollock, Pacific halibut, arrowtooth flounder, and five 2 Surface: 2,029,679 km species of salmon—coho, chinook, chum, pink and sockeye—are Sea surface temperature: 1–9°C (winter) and 10–16°C (summer) and reaching 20°C in sheltered also abundant. Shellfishes such as clam, crab, scallop, shrimp, and areas during the warmest months squid are common. Over the years, salmon and herring stocks Major currents and gyres: Alaskan Current/Stream, Alaska Coastal Current, North Pacific Current have been heavily fished, and although herring stocks are rebound- Physiography: rocky coastlines, numerous islands, fjords and embayments, narrow continental shelf, large number of seamounts rise from the deeper waters offshore ing, the health of salmon stocks remains precarious. Climate and Depth: shelf (roughly 0–200 m): 18%; slope (roughly 200–2,500/3,000 m): 22%; abyssal plain current changes in the 1970s associated with the Pacific Decadal (roughly 3,000+ m): 60% Oscillation caused population shifts in commercially important Substrate type: mainly rock and mud inshore with sand, rock and gravel offshore fish and shellfish species and subsequent declines in populations Major community types and subtypes: mud flats, tidal marshes, rocky reefs, rocky shorelines, of sea lions and puffins. The Kodiak Archipelago is home to the kelp beds, eelgrass beds, seamounts, hydrothermal vents Kodiak bear, the region’s terrestrial apex predator and a species Productivity: moderately high (150–300 g C/m2/yr) that has been genetically isolated from other bear populations for Endemics: none known; however, seamount fauna have not been well studied some 12,000 years. Species at risk: bowhead, sperm, sei, beluga, right, humpback, gray, and blue whales; Steller sea lion; sea otter The region is important for a large proportion of the world’s Important introduced and invasive species: at least seventeen non-indigenous species identified populations of Cassin’s auklet (70 percent—particularly on the in south-central Alaska, including Norway rat, Arctic fox, Atlantic salmon, European green crab, Scott Islands, which includes 55 percent of the world population), purple loosestrife, and Japanese knotweed ancient murrelet (40 percent), as well as some 75 percent of Human activities and impacts: fishing, marine recreation, tourism, oil and gas exploration and recovery Canada’s tufted puffins. The region also provides feeding and resting areas for large numbers of migrating and wintering ducks, geese (Anser and Branta spp.), swans, loons, and shorebirds. on its stable temperatures, the Alaskan/Fjordland Region may be considered a transition zone between the polar Bering Sea Marine mammals common to the region are gray, minke, hump- and Arctic Ocean, and the temperate waters of the mid-latitude back and killer whales; harbor and Dall’s porpoise; Pacific white- Pacific Ocean. sided dolphin; and sea otter. Although the sea otter’s range is vast, the greater part of the world’s population can be found in Alaskan Sea ice is generally absent from this region. The land barrier waters. Major concentrations of adult sea otter can be found imposed by the Alaskan Peninsula prevents much of the cold within this region in the Alexander Archipelago, in Prince Wil- Arctic currents from flowing down the west coast, so there is little liam Sound, and on Kodiak Island. The North Pacific right whale oceanic water exchanged between the Arctic and lower Pacific has major adult concentrations off Kodiak Island and the Alaska regions. Ice occurs only seasonally at the northern boundary near Penninsula, and major adult feeding concentrations of humpback the Bering Sea, the Sea of Okhotsk, and in northern bays and whales occur from Kodiak Island to Unimak Pass, in Prince William inlets where glaciers may feed into the ocean. Sound and the Alexander Archipelago. The Cook Inlet stock of beluga whale declined by nearly 50 percent between 1994 and Biological Setting 1998 and has been listed as depleted under the US Marine Mammal The Alaskan/Fjordland Shelf hosts one of the most highly produc- Protection Act. The northern fur seal is the most abundant seal tive marine ecosystems in the northern Pacific. Upwelling in the in the region, and harbor seals are also common. Steller sea lions, center of the Alaska Gyre pushes nutrients, phytoplankton and which have major rookery areas in the Alexander Archipelago zooplankton production onto the shelf along the edge of the gulf. and on the Alaska Peninsula, have declined since the 1970s. The region is home to about 3,800 species of invertebrates, repre- senting 3.5 percent of all marine invertebrates in the world. These Through the continental portion of the region (and adjacent populations include a rich mixture of oceanic, subpolar, neritic areas), freshwater discharges from the Fraser, Skeena, Nass, Stikine, (living in the tide waters and landwashes) and benthic plankton. Susitna and other rivers carry vast amounts of nutrients to the 126 Marine Ecoregions of North America ocean, stimulating the growth of phytoplankton, algae, and other habitat, heavy fishing, and industrial pollution—the main sources marine plant life. Along the water’s edge, coastal salt marshes of ecological stress to the region. Development in major estuaries and mud flats contain large beds of eelgrass, important spawn- and deltas has altered and reduced habitats, while unsustainable ing sites for Pacific herring schools and nursery areas for some fishing pressures have had serious impacts on a variety of fish and salmon. In the subtidal zones lie vast forests of giant kelp and bull shellfish populations and other organisms that depend on them. kelp. Recent explortion of seamounts in the Gulf of Alaska and One of the latest activities being developed is aquaculture—for Aleutian Islands have revealed rich faunas of deepwater stony finfish (salmon) and shellfish (mussels, oysters, scallops), in par- corals and gorgonians (especially of the Families Paragorgiidae, ticular—some of which rely on introduced species. The spread Primnoidae)—unique deepwater ecosystems. of diseases and parasites is also a concern associated with aqua- culture. In this region, as in the Atlantic, the potential ecological Human Activities and Impacts impacts of the industry are still being assessed and debated as The region ranges from the coastal urban areas of just north there are concerns that it might have negative effects on marine of southwest British Columbia (with one of the fastest growing ecosystems. Ecological conditions of the coastal resources in human populations in North America), to sparsely inhabited areas Alaska are poorly known. Alaska has assessed less than 0.1 per- further north. Throughout the region, fishing, shipping, tourism cent of its coastal estuaries (EPA 2005). While most coastal areas and marine recreation are the main human activities.
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