Washington NatureMapping Program

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Definition of "Wetlands" - General Code 500: Vegetated areas where plants are rooted in water or water saturated soil or that regularly tolerate flooding for extensive time periods.

Wetlands: Estuaries including all vegetation types (510)

picture of estuaries
Descriptive Habitat Code: Estuaries (5) are wetlands where plants are rooted in salt water (1) or that regularly tolerate tidal changes that include all wetland vegetation (0).    Photo: KMD

"Estuary" is the term given to the area at the end of a river where its fresh water mingles with the salt water of the sea. Also called harbors and bays, these areas nurture a diverse array of plants and animals.




American wigeon
Anas americana
Code: ANAAM
Photo: RA
Distribution and Habitat:
It is distributed across North America from Alaska southward to Costa Rica

Diet:
It feeds primarily upon aquatic plants, such as wild celery.

Interesting fact:
The American wigeon can be found feeding on large grassy areas, such as golf courses.

American Wigeon Fact Sheet »



Dunlins
Calidris alpina
Code: CAALP
Photo: RA
Distribution and Habitat:
It is found in coastal areas as well as in the Great Lakes Region.

Diet:
It feeds primarily on insects, small crustaceans and worms.

Interesting fact:
Dunlins nest in small depressions in the ground near ponds, lakes and salt marshes. They fly in large flocks and seem to turn in flight--all at the same time.



Gapper's red-backed vole
Clethrionomys gapperi
Code: CLGA
Photo: WDFW
Distribution and Habitat:
This species is found from sea level to the timberline on both sides of Washington State.

Diet:
They are hervivores and generally eat the green portions of a variety of plants.

Interesting fact:
Voles do not hibernate. They make tunnels under the snow during the winter.

Red-backed Vole Fact Sheet »



Geoduck clams
Panopea abrupta
Code: PAAB
Photo: AP

Distribution and Habitat:
Estuaries and beaches. Geoducks are sessile and do not move once they have selected a site about 2' below the surface of the sand. Native littleneck clams and manillas (introduced from Japan) are much smaller and live just beneath the surface of the beach, and further up the beach in the intertidal zone.

Diet:
Geoduck clams, like their smaller clam cousins, are filter feeders. They stick their long necks above ground to feed.

Interesting fact:
They are very large. You may find them at fish markets weighing 3 pounds and about 16-18" long. Their name is pronounced GOOEY duck.

The common name for geoduck has a native American origin, meaning "dig deep", a reference to humans or sea otters digging them.



Green heron
Butorides striatus
Code: BUST
Photo: RA
Distribution and Habitat:
The green heron is found in secluded wetlands, wooded sloughs, and along slow-moving water in ditches.

Diet:
It feeds largely on fish. Frogs and other small animals are also occasionally taken.

Interesting fact:
It is a good climber, adept at moving among the tangles of trees and bushes near the water while in search of food. This species is also known as the green-backed heron.

Green Heron Fact Sheet »



Pacific harbor seal
Phoca vituline
Code: PHVI
Photo: KMD
Distribution and Habitat:
It is found in coastal waters, marine estuaries and rivers in areas free from ice.

Diet:
It feeds largely on fish such as cod, flatfish, and salmon.

Interesting fact:
Pacific harbor seals have been known to live in captivity for well over 30 years. The earless seals, to which the Pacific harbor seal belongs, appeared in the fossil records about 15 million years ago.

Harbor Seal Fact Sheet »



Pacific Oyster
Crassostrea gigas

Photo: AP
Distribution and Habitat:
Wherever there are accessible beaches, people can find clams and oysters at low tide.

Diet:
Oysters are filter feeders, grabbing nutrients floating in the water. People eat just about anything.

Interesting fact:
Shellfish beds can be contaminated by runoff during heavy rains.

Pacific oysters were introduced from Japan. They develop first as males, and after a year begin to function as females.



Ring-billed gull
Laurs delawarensis
Code: LADE
Photo: RA

Distribution and Habitat:
It is found distributed across North America from southern British Columbia southward to southern Mexico, Cuba and Bermuda.

Diet:
It feeds upon small fish, worms and other small invertebrates, insects, carrion, and small mammals such as mice. They also commonly inhabit garbage dumps, where they scavenge for food.

Interesting fact:
Ring-billed gulls nest on the ground in grassy marshes.



River otter
Lutra canadensis
Code: LUCA
Photo: RA
Distribution and Habitat:
It can be found in coastal marine areas, rivers and lakes.

Diet:
It feeds largely on a variety of fish species.

Interesting fact:
The river otter is a member of the weasel family, but has webbed toes for swimming.

River Otter Fact Sheet »



Spartina
Spartina alterniflora
Code:
Photo: COOP

Distribution and Habitat:
Three species of Spartina (Spartina alterniflora, S. patens, and S. anglica) are invading intertidal areas of Washington, Oregon, California and British Columbia. In Washington, Spartina is present in Willapa Bay and the Puget Sound. Introduced into Washington in 1894. In 2007, Spartina covered more than 2,000 acres, and is a threat to oyster beds, mud falts, and eelgrass meadows.

Over the past five years, the combined statewide effort to eradicate Spartina from the marine waters of Washington State has been extremely successful. WSDA estimates that the effort has successfully reduced the overall statewide infestation from a high of more than 9,000 solid acres in 2003 to fewer than 1,250 solid acres projected in 2008. That is an unprecedented reduction of more than 85%.

Interesting fact:
Spartina is a prized aquatic plant in the east coast. It provides shelter and breeding sites for many of their estuarine organisms.


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