Cape Sable seaside sparrow | |
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In Everglades National Park | |
Scientific classification | |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Aves |
Order: | Passeriformes |
Family: | Passerellidae |
Genus: | Ammospiza |
Species: | |
Subspecies: | A. m. mirabilis |
Trinomial name | |
Ammospiza maritima mirabilis (Howell, 1919) | |
Synonyms [4] [5] | |
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The Cape Sable seaside sparrow (Ammospiza maritima mirabilis) is a subspecies of the seaside sparrow, a species of bird in the family Passerellidae native to the United States. This subspecies is endemic to southern Florida. It is designated endangered under the Endangered Species Act.
The Cape Sable seaside sparrow is 13 to 14 centimeters (5.1 to 5.5 in) in length. The back is dark olive-gray and the tail and wings are olive-brown. Adults are light gray on the belly to almost white with dark olive-gray streaks on the breast and sides. [6]
This subspecies occurs in prairie habitat, breeding in mixed marl prairie dominated by gulf hairawn muhly ( Muhlenbergia sericea ). [6] The sparrow makes cup-shaped nests attached to vegetation a few inches above the ground. [7] A female may produce two clutches per season, and a third if conditions are favorable. [6]
Males are very territorial, claiming a patch of prime breeding habitat and defending it. Most vocalizations are produced by the males, which perch and call loudly to defend territory and advertise to females. [6]
Courtship behavior includes males chasing females and offering them food and nesting materials. Females may initiate the process by approaching males and begging. Male and female raise their clutch of young together, and may remain together for the next clutch. [6]
This subspecies is omnivorous, gleaning plant and animal items from the ground, including seeds, insects, and marine invertebrates. [6]
The Cape Sable seaside sparrow lives on the prairies of the Everglades. The largest populations are in Big Cypress National Preserve and Taylor Slough in Everglades National Park. The common name of the bird refers to Cape Sable, the southernmost point of mainland Florida and part of the Everglades. [7]
This bird requires aquatic prairie with low water levels and open areas. Sea level rise, alterations in water flow caused by water management practices in South Florida, and natural processes such as hurricanes, have caused water level changes and flooding, reducing available habitat. Fire suppression has increased the plant density and diversity in the area, reducing the open habitat required by the sparrow. These factors contributed to its decline. [7]
The bird is strongly influenced by water levels. Water level rise effectively halts breeding activities, in part because nests are suspended just off the ground. Daily water level shifts even affect behavior, subduing vocalizations by territorial males. [6]
The bird's sensitivity to environmental conditions have earned it the nickname "Goldilocks bird", because for it to succeed, conditions must be "just right". [8]
Water levels are tightly managed in many wetland regions in South Florida, with flood gates controlling water flow in parts of the Everglades. The flood gates were opened after heavy rains in the winter of 2016, inundating areas where water levels have been relatively low for decades. Sparrows in these areas immediately lost breeding habitat. Water management officials continue to balance species conservation with the adverse effects of flooding in this region. [9]
In August 2013, Duke University scientist Stuart Pimm and the Center for Biological Diversity announced filing of a lawsuit against the U.S. Army Corps of Engineers and U.S. Fish and Wildlife Service. At issue was the continuing release of water flooding the Cape Sable seaside sparrow's habitat. The lawsuit alleged the practice to be in violation of the Endangered Species Act. [10]
In 2016, the two agencies involved announced plans for further conservation activities to support the sparrow. These include stewarding areas that contain the best potential breeding habitat, and identifying areas that may serve as potential breeding sites as sea levels rise. [11]
The bird illustrates the umbrella species concept of conservation biology, in that thorough protection of this taxon would require protection of a particular habitat and ecosystem, which would result in benefits for a great many other species. [8]
Everglades National Park is an American national park that protects the southern twenty percent of the original Everglades in Florida. The park is the largest tropical wilderness in the United States and the largest wilderness of any kind east of the Mississippi River. An average of one million people visit the park each year. Everglades is the third-largest national park in the contiguous United States after Death Valley and Yellowstone. UNESCO declared the Everglades & Dry Tortugas Biosphere Reserve in 1976 and listed the park as a World Heritage Site in 1979, and the Ramsar Convention included the park on its list of Wetlands of International Importance in 1987. Everglades is one of only three locations in the world to appear on all three lists.
The piping plover is a small sand-colored, sparrow-sized shorebird that nests and feeds along coastal sand and gravel beaches in North America. The adult has yellow-orange-red legs, a black band across the forehead from eye to eye, and a black stripe running along the breast line. This chest band is usually thicker in males during the breeding season, and it is the only reliable way to tell the sexes apart. The bird is difficult to see when it is standing still, as it blends well with open, sandy beach habitats. It typically runs in short, quick spurts and then stops.
The grasshopper sparrow is a small New World sparrow. It belongs to the genus Ammodramus, which contains three species that inhabit grasslands and prairies. Grasshopper sparrows are sometimes found in crop fields and they will readily colonize reclaimed grassland. In the core of their range, grasshopper sparrows are dependent upon large areas of grassland where they avoid trees and shrubs. They seek out heterogenous patches of prairie that contain clumps of dead grass or other vegetation where they conceal their nest, and also contain barer ground where they forage for insects, spiders, and seeds. Grasshopper sparrows are unusual among New World sparrows in that they sing two distinct song types, the prevalence of which varies with the nesting cycle. The primary male song, a high trill preceded by a stereotyped series of short chips, is reminiscent of the sounds of grasshoppers and is the origin of this species' name. Like some other birds of the central North American grasslands, this species also moves around a lot, not only via annual migrations, but individuals frequently disperse between breeding attempts or breeding seasons. Grasshopper sparrows are in steep decline across their range, even in the core of the breeding distribution in the tallgrass prairies of the central Great Plains. The Florida grasshopper sparrow is highly endangered.
Henslow's sparrow is a passerine bird in the family Passerellidae. It was named by John James Audubon in honor of John Stevens Henslow. It was originally classified in the genus Emberiza and called Henslow's bunting.
LeConte's sparrow, also known as LeConte's bunting, is one of the smallest New World sparrow species in North America.
Baird's sparrow is a species of North American birds in the family Passerellidae of order Passeriformes. It is a migratory bird native to the United States, Canada, and Mexico.
Ammodramus is a genus of birds in the family Passerellidae, in the group known as American sparrows. Birds of this genus are known commonly as grassland sparrows. The name Ammodramus is from the Greek for "sand runner".
The snail kite is a bird of prey within the family Accipitridae, which also includes the eagles, hawks, and Old World vultures. Its relative, the slender-billed kite, is now again placed in Helicolestes, making the genus Rostrhamus monotypic. Usually, it is placed in the milvine kites, but the validity of that grouping is under investigation.
The dusky seaside sparrow was a non-migratory subspecies of the seaside sparrow, found in Florida in the natural salt marshes of Merritt Island and along the St. Johns River. The last definite known individual died on Walt Disney World's Discovery Island in 1987, and the subspecies was officially declared extinct in December 1990.
Taylor Slough, located in the southeastern corner of the Florida Everglades, along with the much larger Shark River Slough farther to the west, are the principal natural drainages for the freshwater Everglades and the essential conduit for providing overland freshwater to Florida Bay.
Cape Sable is the southernmost point of the United States mainland and mainland Florida. It is located in southwestern Florida, in Monroe County, and is part of the Everglades National Park.
The seaside sparrow is a species of American sparrow.
Scott's seaside sparrow is a subspecies of the seaside sparrow. It was originally thought to be a separate species but later reconsidered as a subspecies of the seaside sparrow.
Before drainage, the Everglades, a region of tropical wetlands in southern Florida, were an interwoven mesh of marshes and prairies covering 4,000 square miles (10,000 km2). The Everglades is both a vast watershed that has historically extended from Lake Okeechobee 100 miles (160 km) south to Florida Bay, and many interconnected ecosystems within a geographic boundary. It is such a unique meeting of water, land, and climate that the use of either singular or plural to refer to the Everglades is appropriate. When Marjory Stoneman Douglas wrote her definitive description of the region in 1947, she used the metaphor "River of Grass" to explain the blending of water and plant life.
An ongoing effort to remedy damage inflicted during the 20th century on the Everglades, a region of tropical wetlands in southern Florida, is the most expensive and comprehensive environmental repair attempt in history. The degradation of the Everglades became an issue in the United States in the early 1970s after a proposal to construct an airport in the Big Cypress Swamp. Studies indicated the airport would have destroyed the ecosystem in South Florida and Everglades National Park. After decades of destructive practices, both state and federal agencies are looking for ways to balance the needs of the natural environment in South Florida with urban and agricultural centers that have recently and rapidly grown in and near the Everglades.
Nelson's sparrow is a small New World sparrow.
The saltmarsh sparrow is a small New World sparrow found in salt marshes along the Atlantic coast of the United States. At one time, this bird and the Nelson's sparrow were thought to be a single species, the sharp-tailed sparrow. Because of this, the species was briefly known as the "saltmarsh sharp-tailed sparrow." Saltmarsh sparrow numbers are declining due to habitat loss largely attributed to human activity.
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Ammospiza is a genus of birds in the family Passerellidae, in the group known as American sparrows.