Puget lowland forests is a

temperate coniferous forest Temperate coniferous forest is a terrestrial biome defined by the World Wide Fund for Nature. Temperate coniferous forests are found predominantly in areas with warm summers and cool winters, and vary in their kinds of plant life. In some, needle ...

ecoregion An ecoregion (ecological region) is an ecological and geographic area that exists on multiple different levels, defined by type, quality, and quantity of environmental resources. Ecoregions cover relatively large areas of land or water, and c ...

on the

Pacific The Pacific Ocean is the largest and deepest of Earth's five oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean, or, depending on the definition, to Antarctica in the south, and is bounded by the cont ...

coast of

North America North America is a continent in the Northern Hemisphere, Northern and Western Hemisphere, Western hemispheres. North America is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South Ameri ...

, as defined by the

World Wildlife Fund The World Wide Fund for Nature (WWF) is a Swiss-based international non-governmental organization founded in 1961 that works in the field of wilderness preservation and the reduction of human impact on the environment. It was formerly named the ...

(WWF) categorization system.

Setting

The WWF defines the ecoregion as inhabiting mainland coasts and islands of the Georgia Depression, a glacially depressed area dominated by the

Salish Sea The Salish Sea ( ) is a List of seas on Earth #Terminology, marginal sea of the Pacific Ocean located in the Provinces and territories of Canada, Canadian province of British Columbia and the States of the United States , U.S. state of Washingto ...

and numerous inflowing rivers. This differs from the Strait of Georgia/Puget Lowland ecoregion defined by the CEC in that it explicitly excludes the lowlands along the east coast of

Vancouver Island Vancouver Island is an island in the northeastern Pacific Ocean and part of the Canadian province of British Columbia. The island is in length, in width at its widest point, and in total area, while are of land. The island is the largest ...

. The WWF considers these lowlands a part of the neighbouring Central Pacific coastal forests ecoregion. The landscape features glacially striated tablelands and rolling hills underlain by sedimentary rocks. The majority of

soil Soil, also commonly referred to as earth, is a mixture of organic matter, minerals, gases, water, and organisms that together support the life of plants and soil organisms. Some scientific definitions distinguish dirt from ''soil'' by re ...

s in the depression are formed from

glacial till image:Geschiebemergel.JPG, Closeup of glacial till. Note that the larger grains (pebbles and gravel) in the till are completely surrounded by the matrix of finer material (silt and sand), and this characteristic, known as ''matrix support'', is d ...

glacial outwash An outwash plain, also called a sandur (plural: ''sandurs''), sandr or sandar, is a plain formed of glaciofluvial deposits due to meltwater outwash at the terminus of a glacier. As it flows, the glacier grinds the underlying rock surface and ...

, and Lacustrine deposits. Elevations range from sea level to 460 m (1,509 ft), seldom exceeding 160 m (525 ft).

Climate

The ecoregion has a predominantly

Mediterranean climate A Mediterranean climate ( ), also called a dry summer climate, described by Köppen and Trewartha as ''Cs'', is a temperate climate type that occurs in the lower mid-latitudes (normally 30 to 44 north and south latitude). Such climates typic ...

(

Köppen Köppen is a German surname. Notable people with the surname include: * Bernd Köppen (1951–2014), German pianist and composer * Carl Köppen (1833-1907), German military advisor in Meiji era Japan * Edlef Köppen (1893–1939), German author ...

''Csb'') with fresh, dry, sunny summers and cool winters with moderate precipitation and plentiful cloud cover. Further inland it gradually transitions into an

Oceanic climate An oceanic climate, also known as a marine climate or maritime climate, is the temperate climate sub-type in Köppen climate classification, Köppen classification represented as ''Cfb'', typical of west coasts in higher middle latitudes of co ...

(

''Cfb'') with slightly milder, wetter summers. The mean annual temperature is 9 °C (48.2 °F), the mean summer temperature is 15 °C (59 °F), and the mean winter temperature is 3.5 °C (38.3 °F). Annual precipitation averages between 800 and 900 mm (31.5 to 35.4 in), but may be as high as 1,530 mm (60.2 in).

Ecology

Flora

Before European settlement, the Georgia Depression was dominated by dense coniferous forests of

Coast Douglas-fir ''Pseudotsuga menziesii'' var. ''menziesii'', commonly known as Coast Douglas-fir, Pacific Douglas-fir, Oregon pine, or Douglas spruce, is an evergreen conifer native to western North America from west-central British Columbia, Canada southward t ...

Western Hemlock ''Tsuga heterophylla'', the western hemlock or western hemlock-spruce, is a species of hemlock native to the northwest coast of North America, with its northwestern limit on the Kenai Peninsula, Alaska, and its southeastern limit in northern ...

, Western Redcedar, shore pine, and western white pine. The ecoregion was also home to extensive

coastal wetland A wetland is a distinct semi-aquatic ecosystem whose groundcovers are flooded or saturated in water, either permanently, for years or decades, or only seasonally. Flooding results in oxygen-poor (anoxic) processes taking place, especially in ...

s and

peat bog A bog or bogland is a wetland that accumulates peat as a deposit of dead plant materials often mosses, typically sphagnum moss. It is one of the four main types of wetlands. Other names for bogs include mire, mosses, quagmire, and muske ...

ecosystems scattered about in poorly drained areas. The lowlands south of

Puget Sound Puget Sound ( ; ) is a complex estuary, estuarine system of interconnected Marine habitat, marine waterways and basins located on the northwest coast of the U.S. state of Washington (state), Washington. As a part of the Salish Sea, the sound ...

were home to an extensive region of

prairie Prairies are ecosystems considered part of the temperate grasslands, savannas, and shrublands biome by ecologists, based on similar temperate climates, moderate rainfall, and a composition of grasses, herbs, and shrubs, rather than trees, as the ...

s. These ecosystems have since been greatly reduced in size due to the repurposing of these lands for

agriculture Agriculture encompasses crop and livestock production, aquaculture, and forestry for food and non-food products. Agriculture was a key factor in the rise of sedentary human civilization, whereby farming of domesticated species created ...

grazing In agriculture, grazing is a method of animal husbandry whereby domestic livestock are allowed outdoors to free range (roam around) and consume wild vegetations in order to feed conversion ratio, convert the otherwise indigestible (by human diges ...

industry Industry may refer to: Economics * Industry (economics), a generally categorized branch of economic activity * Industry (manufacturing), a specific branch of economic activity, typically in factories with machinery * The wider industrial sector ...

, and

urban development Urban means "related to a city". In that sense, the term may refer to: * Urban area, geographical area distinct from rural areas * Urban culture, the culture of towns and cities Urban may also refer to: General * Urban (name), a list of peop ...

Fauna

Mammals that inhabit this ecoregion include

black-tailed deer Black-tailed deer or blacktail deer occupy coastal regions of western North America. There are two subspecies, the Columbian black-tailed deer (''Odocoileus hemionus columbianus'') which ranges from the Pacific Northwest of the United States and ...

coyote The coyote (''Canis latrans''), also known as the American jackal, prairie wolf, or brush wolf, is a species of canis, canine native to North America. It is smaller than its close relative, the Wolf, gray wolf, and slightly smaller than the c ...

raccoon The raccoon ( or , ''Procyon lotor''), sometimes called the North American, northern or common raccoon (also spelled racoon) to distinguish it from Procyonina, other species of raccoon, is a mammal native to North America. It is the largest ...

mink Mink are dark-colored, semiaquatic, carnivorous mammals of the genera ''Neogale'' and '' Mustela'' and part of the family Mustelidae, which also includes weasels, otters, and ferrets. There are two extant species referred to as "mink": the A ...

sea otter The sea otter (''Enhydra lutris'') is a marine mammal native to the coasts of the northern and eastern Pacific Ocean, North Pacific Ocean. Adult sea otters typically weigh between , making them the heaviest members of ...

harbour seal The harbor (or harbour) seal (''Phoca vitulina''), also known as the common seal, is a true seal found along temperate and Arctic marine coastlines of the Northern Hemisphere. The most widely distributed species of pinnipeds, pinniped (walruses ...

red fox The red fox (''Vulpes vulpes'') is the largest of the true foxes and one of the most widely distributed members of the order Carnivora, being present across the entire Northern Hemisphere including most of North America, Europe and Asia, plus ...

, and the introduced

Virginia opossum The Virginia opossum (''Didelphis virginiana''), also known as the North American opossum, is a member of the opossum family found from southern Canada to northern Costa Rica, making it the northernmost marsupial in the world and the only marsup ...

. Birds represent the majority of resident species, including

cooper’s hawk Cooper's hawk (''Astur cooperii'') is a medium-sized hawk native to the North American continent and found from southern Canada to Mexico. This species was formerly placed in the genus ''Accipiter''. As in many birds of prey, the male is small ...

bald eagle The bald eagle (''Haliaeetus leucocephalus'') is a bird of prey found in North America. A sea eagle, it has two known subspecies and forms a species pair with the white-tailed eagle (''Haliaeetus albicilla''), which occupies the same niche ...

turkey vulture The turkey vulture (''Cathartes aura'') is the most widespread of the New World vultures. One of three species in the genus '' Cathartes'' of the family Cathartidae, the turkey vulture ranges from southern Canada to the southernmost tip of Sou ...

owl Owls are birds from the order Strigiformes (), which includes over 200 species of mostly solitary and nocturnal birds of prey typified by an upright stance, a large, broad head, binocular vision, binaural hearing, sharp talons, and feathers a ...

, blue grouse,

waterfowl Anseriformes is an order of birds also known as waterfowl that comprises about 180 living species of birds in three families: Anhimidae (three species of screamers), Anseranatidae (the magpie goose), and Anatidae, the largest family, which i ...

, and numerous

passerine A passerine () is any bird of the order Passeriformes (; from Latin 'sparrow' and '-shaped') which includes more than half of all bird species. Sometimes known as perching birds, passerines generally have an anisodactyl arrangement of their ...

species.

Threats and preservation

Development

This ecoregion lies within the most densely populated area of

British Columbia British Columbia is the westernmost Provinces and territories of Canada, province of Canada. Situated in the Pacific Northwest between the Pacific Ocean and the Rocky Mountains, the province has a diverse geography, with rugged landscapes that ...

and

Washington Washington most commonly refers to: * George Washington (1732–1799), the first president of the United States * Washington (state), a state in the Pacific Northwest of the United States * Washington, D.C., the capital of the United States ** A ...

, including the

metropolitan area A metropolitan area or metro is a region consisting of a densely populated urban area, urban agglomeration and its surrounding territories which share Industry (economics), industries, commercial areas, Transport infrastructure, transport network ...

s of

Vancouver Vancouver is a major city in Western Canada, located in the Lower Mainland region of British Columbia. As the List of cities in British Columbia, most populous city in the province, the 2021 Canadian census recorded 662,248 people in the cit ...

and

Seattle Seattle ( ) is the most populous city in the U.S. state of Washington and in the Pacific Northwest region of North America. With a population of 780,995 in 2024, it is the 18th-most populous city in the United States. The city is the cou ...

. Consequently, only 5% of the original lowland forest habitat within the region remains, and over 90% of these remaining areas have been heavily altered from their natural state. Most exist as tree farms, city parks, or as small state/provincial parks geographically isolated from one another.

Climate change

Sea-level rise The sea level has been rising from the end of the last ice age, which was around 20,000 years ago. Between 1901 and 2018, the average sea level rose by , with an increase of per year since the 1970s. This was faster than the sea level had e ...

threatens to permanently flood large swaths of

and lowland forest. Regions at highest risk include the

Fraser Lowland The Fraser Lowland is a landform and physiographic region in the Pacific Northwest of North America, shared between the Canadian province of British Columbia and the U.S. state of Washington. The region includes much of the Lower Mainland regio ...

and Skagit Valley.

Preservation

The opportunity exists to use local conservation easements to protect remaining riparian and wetland areas, restore a portion of the old-growth forests, and provide connections to adjacent ecoregions. The best candidates for conservation include the establishment of more forest connections between the forests of the

Olympic Peninsula The Olympic Peninsula is a large peninsula in Western Washington that lies across Puget Sound from Seattle, and contains Olympic National Park. It is bounded on the west by the Pacific Ocean, the north by the Strait of Juan de Fuca, and the ...

and

Cascade Mountains The Cascade Range or Cascades is a major mountain range of western North America, extending from southern British Columbia through Washington and Oregon to Northern California. It includes both non-volcanic mountains, such as many of those in the ...

just south of Olympia and the protection of

Burns Bog Burns Bog is an ombrotrophic peat bog located in Delta, British Columbia, Canada. It is the largest raised peat bog and the largest undeveloped urban land mass on the West Coast of the Americas. Burns Bog was originally before development. Curre ...

within

Metro Vancouver The Metro Vancouver Regional District (MVRD), or simply Metro Vancouver, is a Canadian political subdivision and Corporation, corporate entity representing the metropolitan area of Greater Vancouver, designated by provincial legislation as o ...

Protected areas

Some protected areas of this ecoregion include: *

Anacortes Community Forest Lands Anacortes Community Forest Lands (ACFL) consists of mostly forested lands surrounding and adjoining Little Cranberry Lake, Washington, Little Cranberry, Heart, and Whistle Lakes on Fidalgo Island, west and south of Anacortes, Washington. Its high ...

* Billy Frank Jr. Nisqually National Wildlife Refuge *

– part of the Fraser River Delta Ramsar Site * Desolation Sound Marine Provincial Park *

Gulf Islands National Park Reserve Gulf Islands National Park Reserve is a National Parks of Canada, national park located on and around the Gulf Islands in British Columbia, Canada. In the National Parks System Plan, this park provides representation of the Strait of Georgia Lo ...

* Moran State Park * Larrabee State Park *

Stanley Park Stanley Park is a public park in British Columbia, Canada, that makes up the northwestern half of Vancouver's Downtown Vancouver, Downtown peninsula, surrounded by waters of Burrard Inlet and English Bay, Vancouver, English Bay. The park bor ...

References

External links

* {{coord missing, Washington Ecozones and ecoregions of British Columbia Forests of British Columbia Forests of Washington (state) Nearctic ecoregions Pacific temperate rainforests Temperate coniferous forests