Pacific temperate rain forests - AbsoluteAstronomy.com

The Pacific temperate rain forests ecoregion of North America

North America

North America is a continent wholly within the Northern Hemisphere and almost wholly within the Western Hemisphere. It is also considered a northern subcontinent of the Americas...

is the largest temperate rain forest

Temperate rain forest

Temperate rainforests are coniferous or broadleaf forests that occur in the temperate zone and receive high rainfall.-Definition:For temperate rain forests of North America, Alaback's definition is widely recognized:-Global distribution:...

ecoregion on the planet as defined by the World Wildlife Fund (other definitions exist). The Pacific temperate rain forests lie along the western side of the Pacific Coast Ranges

Pacific Coast Ranges

The Pacific Coast Ranges and the Pacific Mountain System are the series of mountain ranges that stretch along the West Coast of North America from Alaska south to Northern and Central Mexico...

along the Pacific Northwest

Pacific Northwest

The Pacific Northwest is a region in northwestern North America, bounded by the Pacific Ocean to the west and, loosely, by the Rocky Mountains on the east. Definitions of the region vary and there is no commonly agreed upon boundary, even among Pacific Northwesterners. A common concept of the...

Coast of North America

North America

North America is a continent wholly within the Northern Hemisphere and almost wholly within the Western Hemisphere. It is also considered a northern subcontinent of the Americas...

from the Prince William Sound

Prince William Sound

Prince William Sound is a sound off the Gulf of Alaska on the south coast of the U.S. state of Alaska. It is located on the east side of the Kenai Peninsula. Its largest port is Valdez, at the southern terminus of the Trans-Alaska Pipeline System...

in Alaska

Alaska

Alaska is the largest state in the United States by area. It is situated in the northwest extremity of the North American continent, with Canada to the east, the Arctic Ocean to the north, and the Pacific Ocean to the west and south, with Russia further west across the Bering Strait...

through the British Columbia Coast

British Columbia Coast

The British Columbia Coast or BC Coast is Canada's western continental coastline on the Pacific Ocean. The usage is synonymous with the term West Coast of Canada....

to Northern California

Northern California

Northern California is the northern portion of the U.S. state of California. The San Francisco Bay Area , and Sacramento as well as its metropolitan area are the main population centers...

, and are part of the Nearctic ecozone, as also defined by the World Wildlife Fund. The Pacific temperate rain forests are characterized by a high amount of rainfall, in some areas more than 300 cm (120 inches) per year and moderate temperatures in both the summer and winter months (between 10-24°C).

These rain forests occur in a number of ecoregion

Ecoregion

An ecoregion , sometimes called a bioregion, is an ecologically and geographically defined area that is smaller than an ecozone and larger than an ecosystem. Ecoregions cover relatively large areas of land or water, and contain characteristic, geographically distinct assemblages of natural...

s, which vary in their species composition, but are predominantly of conifers, sometimes with an understory of broadleaf trees and shrub

Shrub

A shrub or bush is distinguished from a tree by its multiple stems and shorter height, usually under 5–6 m tall. A large number of plants may become either shrubs or trees, depending on the growing conditions they experience...

s. In the WWF's system, sub-ecoregions of the Pacific Temperate Rain Forests Ecoregion are the Northern Pacific coastal forests, Queen Charlotte Islands

Queen Charlotte Islands

Haida Gwaii , formerly the Queen Charlotte Islands, is an archipelago on the North Coast of British Columbia, Canada. Haida Gwaii consists of two main islands: Graham Island in the north, and Moresby Island in the south, along with approximately 150 smaller islands with a total landmass of...

, British Columbia mainland coastal forests, Central Pacific coastal forests, Central and Southern Cascades forests, Klamath-Siskiyou forests, and Northern California coastal forests ecoregions.

The forests in the north contain predominantly Sitka Spruce

Sitka Spruce

Picea sitchensis, the Sitka Spruce, is a large coniferous evergreen tree growing to 50–70 m tall, exceptionally to 95 m tall, and with a trunk diameter of up to 5 m, exceptionally to 6–7 m diameter...

and Western Hemlock

Western Hemlock

Tsuga heterophylla. the Western Hemlock, is a species of hemlock native to the west coast of North America, with its northwestern limit on the Kenai Peninsula, Alaska, and its southeastern limit in northern Sonoma County, California.-Habitat:...

, while those in the coastal forests are home as well to Coast Redwood (Sequoia sempervirens), Coast Douglas-fir

Coast Douglas-fir

Pseudotsuga menziesii, known as Douglas-fir, Oregon Pine, or Douglas spruce, is an evergreen conifer species native to western North America. Its variety Pseudotsuga menziesii var. menziesii, also known as coast Douglas-fir grows in the coastal regions, from west-central British Columbia, Canada...

(Pseudotsuga menziesii), Western Redcedar and Shore Pine. Notably, the three tallest species of trees are found here. Dense growths of epiphyte

Epiphyte

An epiphyte is a plant that grows upon another plant non-parasitically or sometimes upon some other object , derives its moisture and nutrients from the air and rain and sometimes from debris accumulating around it, and is found in the temperate zone and in the...

s and moss

Moss

Mosses are small, soft plants that are typically 1–10 cm tall, though some species are much larger. They commonly grow close together in clumps or mats in damp or shady locations. They do not have flowers or seeds, and their simple leaves cover the thin wiry stems...

es cover the trees, and lush vegetation is present everywhere.

History

About 200 million years ago (during the Triassic

Triassic

The Triassic is a geologic period and system that extends from about 250 to 200 Mya . As the first period of the Mesozoic Era, the Triassic follows the Permian and is followed by the Jurassic. Both the start and end of the Triassic are marked by major extinction events...

and Jurassic

Jurassic

The Jurassic is a geologic period and system that extends from about Mya to Mya, that is, from the end of the Triassic to the beginning of the Cretaceous. The Jurassic constitutes the middle period of the Mesozoic era, also known as the age of reptiles. The start of the period is marked by...

periods), the landscape was dominated by conifers

Pinophyta

The conifers, division Pinophyta, also known as division Coniferophyta or Coniferae, are one of 13 or 14 division level taxa within the Kingdom Plantae. Pinophytes are gymnosperms. They are cone-bearing seed plants with vascular tissue; all extant conifers are woody plants, the great majority being...

, which were the most diverse group of trees and constituted the greatest majority of large trees. When flowering plants emerged (in the following Cretaceous

Cretaceous

The Cretaceous , derived from the Latin "creta" , usually abbreviated K for its German translation Kreide , is a geologic period and system from circa to million years ago. In the geologic timescale, the Cretaceous follows the Jurassic period and is followed by the Paleogene period of the...

period), they quickly prevailed, causing most conifers to become extinct, and those that survived to adapt to harsh conditions. Perhaps the most significant difference in this change is that the primitive conifers invested their energy in the basic food supply for every seed, with no certainty of fertilization; by contrast, flowering plants create the food supply for a seed only after it is triggered by fertilization. The Pacific temperate rain forest now remains the only region on Earth of noteworthy size and significance where, due to unique climatic conditions, the conifers flourish as they did before being displaced by flowering plants (Davis 2000).

The northern Pacific temperate rain forests are relatively young, emerging in the past few thousand years following the retreat of the ice sheet

Ice sheet

An ice sheet is a mass of glacier ice that covers surrounding terrain and is greater than 50,000 km² , thus also known as continental glacier...

s of the last ice age

Ice age

An ice age or, more precisely, glacial age, is a generic geological period of long-term reduction in the temperature of the Earth's surface and atmosphere, resulting in the presence or expansion of continental ice sheets, polar ice sheets and alpine glaciers...

(Davis 2000).

Ecology

The ecosystem of Pacific temperate rain forests is so productive that the biomass

Biomass

Biomass, as a renewable energy source, is biological material from living, or recently living organisms. As an energy source, biomass can either be used directly, or converted into other energy products such as biofuel....

in the best sites is at least four times greater than that of any comparable area in the tropics

Tropical rainforest

A tropical rainforest is an ecosystem type that occurs roughly within the latitudes 28 degrees north or south of the equator . This ecosystem experiences high average temperatures and a significant amount of rainfall...

(Davis 2000). In sheer mass of living and decaying material - trees, mosses, shrubs, and soil - these forests are more massive than any other ecosystem on the planet. In part, this is due to the rarity of fire. Unlike drier forests, which burn periodically, temperate rain forests are naturally subject to only small-scale disturbances, such as blow-downs and avalanches.

This rain forest spans a wide range of latitude - from about 40 degrees north

40th parallel north

The 40th parallel north is a circle of latitude that is 40 degrees north of the Earth's equatorial plane. It crosses Europe, the Mediterranean Sea, Asia, the Pacific Ocean, North America, and the Atlantic Ocean....

to about 60 degrees north

60th parallel north

The 60th parallel north is a circle of latitude that is 60 degrees north of the Earth's equatorial plane. It crosses Europe, Asia, the Pacific Ocean, North America, and the Atlantic Ocean....

. The differences in climate from south to north create several major forest zones, characterized by different species.

At the southern limit in northern California is the "coast redwood zone".
Beginning at the California/Oregon border, and extending through the north end of Vancouver Island is the "seasonal rain forest zone". The major tree species here are Douglas fir, Western Red Cedar, Sitka spruce
Sitka Spruce
Picea sitchensis, the Sitka Spruce, is a large coniferous evergreen tree growing to 50–70 m tall, exceptionally to 95 m tall, and with a trunk diameter of up to 5 m, exceptionally to 6–7 m diameter...

, and Western Hemlock
Western Hemlock
Tsuga heterophylla. the Western Hemlock, is a species of hemlock native to the west coast of North America, with its northwestern limit on the Kenai Peninsula, Alaska, and its southeastern limit in northern Sonoma County, California.-Habitat:...

.
Beyond the northern end of Vancouver Island, is the "perhumid rain forest zone". Douglas fir wanes as a dominant species, and the forest is primarily made up of western red cedar, Sitka spruce, and western hemlock.
The Gulf of Alaska
Gulf of Alaska
The Gulf of Alaska is an arm of the Pacific Ocean defined by the curve of the southern coast of Alaska, stretching from the Alaska Peninsula and Kodiak Island in the west to the Alexander Archipelago in the east, where Glacier Bay and the Inside Passage are found.The entire shoreline of the Gulf is...

begins where the fjords of southeast Alaska end, and marks the transition into "sub-polar rain forest". Here the forest occupies only a very narrow strip between the ocean and the icy alpine zone. The cedar trees no longer thrive in this harsher climate, and the dominant trees are limited to Sitka spruce, and western and mountain hemlock.
The northern limits of the rain forest are scattered in thin bands in the northern Prince William Sound
Prince William Sound
Prince William Sound is a sound off the Gulf of Alaska on the south coast of the U.S. state of Alaska. It is located on the east side of the Kenai Peninsula. Its largest port is Valdez, at the southern terminus of the Trans-Alaska Pipeline System...

, Kenai Fjords
Kenai Fjords National Park
Kenai Fjords National Park is a United States National Park established in 1980 by the Alaska National Interest Lands Conservation Act. The park covers an area of approximately on the Kenai Peninsula in southcentral Alaska, near the town of Seward. The park contains the Harding Icefield, one of...

, eastern Kodiak Island
Kodiak Island
Kodiak Island is a large island on the south coast of the U.S. state of Alaska, separated from the Alaska mainland by the Shelikof Strait. The largest island in the Kodiak Archipelago, Kodiak Island is the second largest island in the United States and the 80th largest island in the world, with an...

, and western Cook Inlet
Cook Inlet
Cook Inlet stretches from the Gulf of Alaska to Anchorage in south-central Alaska. Cook Inlet branches into the Knik Arm and Turnagain Arm at its northern end, almost surrounding Anchorage....

.

Wildlife

The first survey to systematically explore the forest canopy

Canopy (forest)

In biology, the canopy is the aboveground portion of a plant community or crop, formed by plant crowns.For forests, canopy also refers to the upper layer or habitat zone, formed by mature tree crowns and including other biological organisms .Sometimes the term canopy is used to refer to the extent...

in the Carmanah Valley of Vancouver Island

Vancouver Island

Vancouver Island is a large island in British Columbia, Canada. It is one of several North American locations named after George Vancouver, the British Royal Navy officer who explored the Pacific Northwest coast of North America between 1791 and 1794...

yielded 15,000 new species, a third of all invertebrates known to exist in all of Canada

Canada

Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...

. Among the collection were 500 species previously unknown to science (Davis 2000).

The rain forest exists in a complicated landscape of islands and fjords, and many species depend on both the forest and the ocean. Salmon

Salmon

Salmon is the common name for several species of fish in the family Salmonidae. Several other fish in the same family are called trout; the difference is often said to be that salmon migrate and trout are resident, but this distinction does not strictly hold true...

are one of the primary species of the rainforest, spawning in the forest streams. The marbled murrelet

Marbled Murrelet

The Marbled Murrelet is a small seabird from the North Pacific. It is a member of the auk family. It nests in old-growth forests or on the ground at higher latitudes where trees cannot grow...

nests in old growth trees at night, but feeds in the ocean during the day.

Many of the most iconic photos of these forests include a large bear somewhere in the frame. Grizzly bears and black bears

American black bear

The American black bear is a medium-sized bear native to North America. It is the continent's smallest and most common bear species. Black bears are omnivores, with their diets varying greatly depending on season and location. They typically live in largely forested areas, but do leave forests in...

once thrived throughout the rain forest zone and beyond. Black bears can still be found throughout the forest's range, while grizzlies are largely confined to areas north of the Canadian border. These forests have some of the largest concentrations of grizzly bears in the world, mainly due to the region's rich salmon streams. The Great Bear Rainforest

Great Bear Rainforest

The Great Bear Rainforest is the name coined by environmental groups in the mid-1990s to refer to a region of temperate rain forest in Canada, on the British Columbia Coast between Vancouver Island and Southeast Alaska...

in Canada is home to the rare white variant of the black bear known as the "spirit bear". The endangered spotted owl

Spotted Owl

The Spotted Owl, Strix occidentalis, is a species of true owl. It is a resident species of forests in western North America, where it nests in tree holes, old bird of prey nests, or rock crevices. Nests can be between 13 and 66 yards high and usually contain two eggs...

was at the center of logging controversies in Oregon and Washington. Other wildlife species of note include the bald eagle

Bald Eagle

The Bald Eagle is a bird of prey found in North America. It is the national bird and symbol of the United States of America. This sea eagle has two known sub-species and forms a species pair with the White-tailed Eagle...

, marbled murrelet

Marbled Murrelet

The Marbled Murrelet is a small seabird from the North Pacific. It is a member of the auk family. It nests in old-growth forests or on the ground at higher latitudes where trees cannot grow...

, wolf, and sitka deer

Sitka Deer

The Sitka deer or Sitka black-tailed deer , is a subspecies of mule deer , and similar to another subspecies the black-tailed deer . Their name originates from Sitka, Alaska. Weighing in on average between , Sitka deer are characteristically smaller than other types of black-tailed deer...

Logging

Pacific temperate rain forests have been subject to ongoing large-scale industrial logging

Logging

Logging is the cutting, skidding, on-site processing, and loading of trees or logs onto trucks.In forestry, the term logging is sometimes used in a narrow sense concerning the logistics of moving wood from the stump to somewhere outside the forest, usually a sawmill or a lumber yard...

since the end of the Second World War, cutting over half of their total area. In California, only 4% of the redwoods have been protected. In Oregon

Oregon

Oregon is a state in the Pacific Northwest region of the United States. It is located on the Pacific coast, with Washington to the north, California to the south, Nevada on the southeast and Idaho to the east. The Columbia and Snake rivers delineate much of Oregon's northern and eastern...

and Washington, less than 10% of original coastal rain forest remains.

An even larger percentage of the productive forest has been logged. Much of the land is rock, ice, muskeg, or less productive forest on steep slopes. The stereotypical old growth is limited to lowland flats and valleys, which have been preferentially targeted for logging. Historically, the most common protocol has been to place protected areas in the mountains, leaving the valleys to the timber industry. So while some very large areas are protected as parks and monuments, very little of the highest-value habitat has been protected, and much of it has already been cut.

In the Tongass National Forest

Tongass National Forest

The Tongass National Forest in southeastern Alaska is the largest national forest in the United States at 17 million acres . Most of its area is part of the temperate rain forest WWF ecoregion, itself part of the larger Pacific temperate rain forest WWF ecoregion, and is remote enough to be home...

, in the 1950s, in part to aid in Japanese recovery from World War II, the US Forest Service set up long term contracts with two pulp mills: the Ketchikan Pulp Company (KPC) and the Alaska Pulp Company (APC). These contracts were for 50 years, and divided up the forest into areas slated for APC logs and areas slated for KPC logs. These two companies conspired to drive log prices down, conspired to drive smaller logging operations out of business, and were major and recalcitrant polluters of their local areas. These long term contracts guaranteed low prices to the pulp companies — in some cases resulting in trees being given away for less than the price of a hamburger. Since 1980, the US Forest Service has lost over a billion dollars in Tongass timber sales.

Half a million acres (2,000 km²) of the Tongass was selected by native corporations under the 1971 Alaska Native Claims Settlement Act

Alaska Native Claims Settlement Act

The Alaska Native Claims Settlement Act, commonly abbreviated ANCSA, was signed into law by President Richard M. Nixon on December 23, 1971, the largest land claims settlement in United States history. ANCSA was intended to resolve the long-standing issues surrounding aboriginal land claims in...

. Much of this area has been clearcut.

The most controversial timber sales in the Tongass are in the roadless areas. In September 2006, a landmark court decision overturned President George W. Bush's repeal of the Roadless Rule, reverting to the 2001 roadless area protections established under President Clinton. However, the Tongass was exempted from that ruling and it is unclear what the fate of its vast roadless areas will be.

External links

The source of this article is wikipedia, the free encyclopedia. The text of this article is licensed under the GFDL.

History

Ecology

Wildlife

Logging

See also

External links