Seal Beach National Wildlife Refuge

Seal Beach National Wildlife Refuge
IUCN category IV (habitat/species management area)
Marsh wetlands of the Wildlife Refuge.
Map of the United States
Location	Orange County, California, United States
Nearest city	Seal Beach, California
Coordinates	33°44′16″N 118°04′27″W / 33.73772°N 118.07422°W / 33.73772; -118.07422Coordinates: 33°44′16″N 118°04′27″W / 33.73772°N 118.07422°W / 33.73772; -118.07422^[1]
Area	911 acres (3.69 km²)
Established	1972
Governing body	U.S. Fish and Wildlife Service
http://www.fws.gov/sandiegorefuges/Seal.htm

The Seal Beach National Wildlife Refuge is a wildlife refuge encompassing 911 acres (3.69 km²) located in the California coastal community of Seal Beach. Although it is located in Orange County it is included as part of the San Diego National Wildlife Refuge Complex. It was established in 1972.

The refuge is a collaboration between the United States Fish and Wildlife Service and the Department of the Navy.^[2] It serves as a critical habitat and winter stopover for many birds along the Pacific Flyway. Among the birds found at the refuge are great blue herons and the three endangered species: California clapper rail, California least tern, and Belding’s Savannah sparrow.^[3]^[4]

The refuge is located within Naval Weapons Station Seal Beach. Public access in the refuge is limited or restricted to once-a month tour (last Saturday of each month) as it is located within an active military base.^[5]

Habitat

Subtidal habitat

The subtidal zone is the shallow near-shore area below the intertidal zone, the land between the high and low tide marks. Subtidal is permanently inundated, except for rare lowest low tide events. There are four tidal basins created for the restoration of wetland: Forrestal Pond, Case Road Pond, 7th Street Pond, and Perimeter Pond, which are currently supporting the subtidal habitat in the Refuge. Tidal water from Anaheim Bay supports the ponds.^[6]

Dominating plants in these subtidal habitat is eelgrass, and mudflat portions in the habitat is supporting many invertebrate species.

Intertidal channels and tidal mudflat habitats

The complex system of tidal channels delivers moisture and nourishment (oxygen and nutrients) throughout the habitat and providing food or pathway to food for fish and other organisms.

The soil of intertidal flats is a combination of clay, silt, sand, shells, and organic matter, with algae as dominant plants.

Mudflats contain organisms which are a major food source for worms and invertebrates. Fishes, sharks and rays would often come to the mudflats with the tides and feed on transient or permanent residing fish. Shorebirds also depend on preying invertebrates on the mudflats.^[6]

Coastal salt marsh habitat

Coastal salt marsh habitat, situated above mudflats, contains salt tolerant vegetation. It is the predominant habitat in the refuge with 565-acre land occupied. It is a nesting, feeding and cover area for bird and fish including the endangered light-footed clapper rails and Belding’s Savannah sparrow.

A study on light-footed clapper rail was conducted since 1979. One of the study area is in the salt marsh in Anaheim Bay, the coastal salt marsh located in the Seal Beach National Wildlife Refuge. The environment of salt marsh was described: “The surrounding land lands are flat or gently sloping and provide little drainage into the bay. Consequently there are very little fresh water input other than winter rains… Most of the vegetation is characteristic of the low and middle littoral zones and is completely inundated by a 1.8 m tide (Mean Lower Low Water).” A list of major plants in the marsh was also provided: cordgrass (dominant plants at lower elevation), pickleweed and saltwort (dominant in middle elevation), seablite, saltgrass, sea lavender, arrowgrass, Jaumea carnosa, and Frankenia grandiflora.^[7] The dominating plants in the upper zone are glasswort and pickleweed. In the highest elevation (which sometimes is referred to as wetland/upland transition), there are no remaining native species.

Oil extraction beneath the bay led to the marsh subsiding. From 1957 to 1970, elevation dropped 12.5 cm and by 1984, dropped by 25 cm.^[6]

Upland habitat

41 acres within 65 acres of the uplands areas were built into roads, railroad tracks or others manmade structures. Most of these areas were originally wetland but were replaced for agricultural or military practices in the 19th century.

Hog Island

Situated in the southern part of the Refuge, Hog Island was the only place that supported native vegetation, although none of it has been left for today. There are three “arms” stretching out of the land (military used in the past) planted with native vegetation today to support and shelter upland birds, especially during high tides.

NASA Island

The island is completely manmade, built in the 1960s for rocket testing until 1977. It is leveled today and covered with sand to provide a nesting site for the least tern.

Non native upland

One of these upland islands, located in the 7th Street Pond, supports non-native vegetation including five-horn smotherweed, common thistle, Maltese star-thistle, milk thistle, tumbleweed, black mustard, and the native pickleweed. Another one, in Case Road Pond, supports native intertidal vegetation, and some of the non-native vegetation mentioned.

Historical change

In 1944, the Department of the Navy acquired about 5,000 acres of land in and around Anaheim Bay from the Alamitos Land Company. Although the Navy purchased the land, the California State Lands Commission held all of the submerged lands within the station. In May 1954, the Service contacted the Navy, regarding a potential hunting program on their land; however, the Navy rejected permission. Between 1954 and 1956, the Service made several additional proposals to the Navy for managing its lands including raising food crops to support waterfowl. In 1963, Congressman Richard Hanna told the Service he was interested in establishing a Refuge between Huntington Beach and Seal Beach. This cooperative plan for 600 acres of tidal marsh on Naval Weapons Station Seal Beach (NWSSB) was approved in 1964 through a three-way agreement among the Navy, the Service, and the California Department of Fish and Game. In 1971, there was a new discussion about establishing a Refuge at this location. This ultimately triggered political intervention by U.S. Congressman Craig Hosmer and California State Senator Dennis Carpenter. Through the efforts of Congressman Hosmer, President Nixon signed Public Law 92-408 in August 1972, authorizing the establishment of a National Wildlife Refuge on the NWSSB. The Refuge was officially established on July 11, 1974 when the Notice of the Establishment, which included the specific boundaries of the Refuge, was published in the Federal Register.^[8]

Environmental change

Loss of habitat

In 1989, there was a big trapping of hundreds of foxes at Seal Beach National Wildlife Refuge. The red foxes were killed because they put a significant threat to two endangered species of birds, light-footed clapper rail and the California least tern. Even though an animal rights group had requested an injunction to prohibit trapping and maiming the foxes at the refuge, U.S District Judge refused to grant it. Thus, hundreds of foxes were sacrificed to preserve the light-footed clapper rail and the California least tern. Nowadays, no foxes or other predatory mammals can be seen at Seal Beach National Wildlife Refuge. ^[9]

Toxic Contamination

In 1995, there was a study that U.S Navy has found elevated levels of toxic chemicals in the carcasses and food of endangered birds at the Seal Beach National Wildlife Refuge. The elevated levels of cadmium, chromium, copper, lead, nickel and zinc, all poisonous heavy metals, were found in dead California least terns and light-footed clapper rails. However, these potentially toxic substances were not only found in the birds, but also found in smaller animals normally eaten by them. They also found small amounts of PCBs and DDT, a dangerous pesticide that was banned by the Endangered Species Act in 1973. To find the cause, the Navy assessed the impacts of ponds on the refuge on the birds. They found that there was a construction of the pond by the Port of Long Beach that has raised the volume and velocity of the bay water flowing into the refuge. The toxic materials affect the birds with altered growth patterns, reduced survival, loss of appetite, lethargy, difficulty in reproducing, and even killing the birds.^[10]

Studies

Study of the endangered light-footed clapper rail was conducted in 1979. This study mainly focuses on the three remaining largest populations in Anaheim Bay, Upper Newport Bay and Tijuana Marsh in San Diego county.^[7]

Study of the California least tern nesting season was conducted in 1980. This study mainly focuses on previously color-banded least tern chicks nesting behavior in the Seal Beach National Wildlife Refuge. A least tern nesting site was prepared in the refuge in 1978 for the study.^[11]

Draft Comprehensive Conservation Plan/Environmental Assessment

In March 2011, Draft Comprehensive Conservation Plan/Environmental Assessment (CCP/EA) was established to “describes and evaluates various alternatives for managing the Seal Beach National Wildlife Refuge (NWR).”^[12]

References

↑ "Seal Beach National Wildlife Refuge". Geographic Names Information System. United States Geological Survey.
↑ "About the Refuge". Seal Beach National Wildlife Refuge. US Fish & Wildlife Service. Retrieved 2015-12-12.
↑ Brennan, Pat (October 18, 2008). "Endangered Birds Freed". Orange County Register. pp. Local 1.
↑ Rane, Jordan (June 22, 2008). "Seal Beach Navy site offers tours of bird refuge". Los Angeles Times. Retrieved March 7, 2009.
↑ "Seal Beach National Wildlife Refuge." Seal Beach National Wildlife Refuge. U.S. Fish & Wildlife Service. Web. 7 Dec. 2014. <http://www.fws.gov/refuges/profiles/index.cfm?id=81683>.
1 2 3 "Seal Beach National Wildlife Refuge". Seal Beach National Wildlife Refuge - Seal Beach. U.S. Fish & Wildlife Service. Retrieved 8 December 2014.
1 2 Massey, Barbara W.; Zembal, Richard; Jorgensen, Paul D. (1984). "Nesting Habitat of the Light-Footed Clapper Rail in Southern California". Journal of Field Ornithology 55 (1): 67–80. |access-date= requires |url= (help)
↑ "Seal Beach National Wildlife Refuge" (PDF). Retrieved 9 December 2014.
↑ "Green Light Given to Kill Red Foxes in Seal Beach Refuge". Retrieved 9 December 2014.
↑ "Toxic Chemicals Found in Birds Near Navy Base at Seal Beach Wildlife Refuge". Retrieved 9 December 2014.
↑ Massey, Barbara W.; Atwood, Jonathan L. (1981). "Second-Wave Nesting of the California Least Tern: Age Composition and Reproductive Success". The Auk 98 (3): 596–605. |access-date= requires |url= (help)
↑ "Draft Comprehensive Conservation Plan/Environmental Assessment" (PDF). Seal Beach National Wildlife Refuge. U.S. Department of the Interior, Fish and Wildlife Service. Retrieved 7 December 2014.

This article incorporates public domain material from websites or documents of the United States Fish and Wildlife Service.

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