Florida scrub jay

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Florida scrub jay
Temporal range: Gelasian - recent, 2–0  Ma
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Adult Florida scrub jay.jpg
Adult in Lyonia Preserve, near Deltona, Florida
Status TNC G1.svg
Critically Imperiled  (NatureServe) [2]
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Passeriformes
Family: Corvidae
Genus: Aphelocoma
Species:
A. coerulescens
Binomial name
Aphelocoma coerulescens
(Bosc, 1795)
Distribution of Aphelocoma coerulescens.jpg
Synonyms
  • Corvus floridanus
    Bartram , 1791 [3]
  • Corvus coerulescens
    Bosc, 1795
  • Aphelocoma californica coerulescens

The Florida scrub jay (Aphelocoma coerulescens [A] ) is one of the species of scrub jay native to North America. It is the only species of bird endemic to the U.S. state of Florida and one of only 15 species endemic to the continental United States. [4] Because of this, it is keenly sought by birders. It is known to have been present in Florida as a distinct species for at least 2 million years, [5] and is possibly derived from the ancestors of Woodhouse's scrub jay. [6]

Contents

Description

It measures 23 to 28 cm (9.1 to 11.0 in) in length, and weighs from 66 to 92 g (2.3 to 3.2 oz), with an average 80.2 g (2.83 oz). The wingspan of the jay is 33–36 cm (13–14 in). [7] [8] It has a strong black bill, blue head and nape without a crest, a whitish forehead and supercilium, blue bib, blue wings, grayish underparts, gray back, long blue tail, black legs and feet.

Ecology

The Florida scrub jay is found only in Florida scrub habitat, an ecosystem that exists only in central Florida and in limited areas along the Atlantic coast, and is characterized by nutrient-poor soil, occasional drought, and frequent wildfires. Because of its being isolated from the mainland as an island ("Orange Island") 34 to 28 million years ago [9] and somewhat harsh weather pattern, this habitat in isolation evolved to host not only the Florida scrub jay endemic only to Florida, but also a small assortment of very ancient specific plants, including sand pine, sand live oak, myrtle oak, Chapman's oak, sandhill oak, Florida rosemary [10] and various other hardy plants such as eastern prickly pear. [11]

Florida scrub jays are omnivorous and eat a wide variety of acorns, seeds, peanuts, insects, tree frogs, turtles, snakes, lizards, and young mice. They have also been occasionally observed to eat other birds' eggs or nestlings, but this occurs rarely. [12] They routinely cache thousands of acorns a year, burying them just beneath the surface. The acorns are typically buried in the fall and consumed during the winter and spring. Acorns that are forgotten or missed may germinate, making the Florida Scrub-Jay an effective agent for the dispersal of a variety of oak trees.

The Florida scrub jay may exhibit coordinated cooperative hunting, as seen in one case where a mated pair of the birds were observed attacking a black racer together in southcentral Florida. The snake may have been too large for one jay to kill it alone, and the pair ultimately succeeded in killing the reptile. Cooperated hunting like this is rarely documented in passerines. [13]

Scrub jays may also take silverware and other shiny objects in a manner similar to the American crow.

Reproduction

Florida scrub jays are one of the few cooperative breeding birds in North America. Fledglings remain in their parents' habitat for several years and help to rear young, watch for predators (such as short-tailed hawks or Accipiter ), and defend territory against neighboring Florida scrub jay family groups. These families can range in size from 2 to 8. [14]

Juvenile Juvenile Florida scrub jay.jpg
Juvenile
Juvenile developing adult coloration Juvenile Florida scrub jay 03.jpg
Juvenile developing adult coloration

After about 2 to 3 years, fledglings leave the group to form mating pairs of their own. Mating season ranges from March to June. Clutches usually contain about 3 to 4 eggs which are incubated in about 17 days. Fledging occurs in about 16 to 19 days. Fledglings can be distinguished from the adult birds due to the coloration of the feathers on their head, which are brown instead of blue. The brown feathers on the juvenile's head are slowly replaced by blue feathers as the bird matures into adulthood.

Conservation

A Florida scrub jay explores its surroundings Florida Scrub-Jay perched.jpg
A Florida scrub jay explores its surroundings

Scrub habitat has dwindled considerably in the past several decades as Florida has continued to develop. Wildfire suppression also leads to the natural succession of large oaks and trees which changes the habitat. In recent years, environmental groups within the state have made a strong effort at preserving Florida's remaining scrub through controlled burns and even clearing out areas of large trees to increase the size of a scrub habitat. Because scrub habitat is typically "well-drained sites with low nutrient levels and periodic fires," the species is vulnerable to climate change. [15] Oscar Scherer State Park near Sarasota has one of the larger habitats under state management.

The Florida scrub jay was officially listed as a threatened state species by Florida Fish and Wildlife Conservation Commission in 1975 and it was listed as a threatened federal species by the United States Fish and Wildlife Service in 1987.

According to Partners in Flight, there were estimated to be 4000 individuals left in the wild. [16] Despite the protections, the Florida scrub jay is still thought to be on the decline. Studies done in Brevard County, once the county with the greatest population of scrub jays, has noted declines of some 33% since the 1993 census alone.

Another attempt to conserve the bird is an ongoing campaign to name the Florida scrub jay as the new state bird of Florida. The main argument for changing the state bird is that the current state bird (viz. the northern mockingbird) is the state bird of several other states, while the scrub jay is exclusive to Florida.

In recent years there has been some debate about whether or not the Florida scrub jay should be officially listed as an Endangered Species because of the loss of homes. However, environmentalists hope that current conservation efforts should help the species population to at least stabilize.

On the other hand, the IUCN classifies this species as vulnerable to extinction. [1] In 2004, the population was declining and no more than 10 subpopulations were known. Both the number of adult birds as well as amount and quality of habitat were in decline, and local subpopulations were in danger of disappearing altogether. About 8000 mature birds were believed to exist—with no more than 1000 in any one subpopulation—and population numbers had dropped by about 10% over the last decade or so.

A long-term and ongoing study of the Florida scrub jay has been taking place at the Archbold Biological Station at Lake Placid.

The Florida scrub jay was featured in episode 11, season 3 of the Showtime television series Penn & Teller: Bullshit! .

Dangers of human feeding

An inquisitive and intelligent species, the most striking attribute of the Florida scrub jay's behavior is its remarkable tameness. [17] As such, scrub jays willingly take food from human hands.

Unfortunately, this tameness is dangerous to the well-being of the species. [18] Florida scrub jays that are fed by humans will reproduce earlier in the year than those that are not. However, fledgling scrub jays feed primarily on caterpillars present in the late spring and summer; if they hatch too early in the year when the caterpillars are not available, this can lead to their malnutrition or starvation.

Another potential danger of feeding Florida scrub jays occurs when people feed them near a road, as one major cause of death for scrub jays in urban areas is collision with vehicles. [19] Since humans build subdivisions, railroads, and highways on the highest and driest ground, where Florida scrub jays like to live, this removal of habitats, along with the introduction of pets, especially cats not on a leash, has devastated scrub jay populations. In the last 100 years, 90% of the bird's population has been lost. [20]

Footnotes

A Etymology: Aphelocoma, from Latinized Ancient Greek apheles- (from ἀφελής-) "simple" + Latin coma (from Greek kome κόμη) "hair", in reference to the lack of striped or banded feathers in this genus, compared to other jays. coerulescens, Latin for "becoming blue", in reference to the species' color which is lighter than in most American jays.

Related Research Articles

<span class="mw-page-title-main">Corvidae</span> Family of perching birds

Corvidae is a cosmopolitan family of oscine passerine birds that contains the crows, ravens, rooks, magpies, jackdaws, jays, treepies, choughs, and nutcrackers. In colloquial English, they are known as the crow family or corvids. Currently, 135 species are included in this family. The genus Corvus containing 47 species makes up over a third of the entire family. Corvids (ravens) are the largest passerines.

<span class="mw-page-title-main">Torresian crow</span> Species of bird

The Torresian crow, also called the Australian crow or Papuan crow, is a passerine bird in the crow family native to the north and west of Australia and nearby islands in Indonesia and Papua New Guinea. The species has a black plumage, beak and mouth with white irises. The base of the feathers on the head and neck are white. The Torresian crow is slightly larger with a more robust bill than the morphologically similar little crow.

<span class="mw-page-title-main">Eurasian jay</span> Species of bird

The Eurasian jay is a species of passerine bird in the crow family Corvidae. It has pinkish brown plumage with a black stripe on each side of a whitish throat, a bright blue panel on the upper wing and a black tail. The Eurasian jay is a woodland bird that occurs over a vast region from western Europe and north-west Africa to the Indian subcontinent and further to the eastern seaboard of Asia and down into south-east Asia. Across this vast range, several distinct racial forms have evolved which look different from each other, especially when comparing forms at the extremes of its range.

<span class="mw-page-title-main">Blue jay</span> Species of bird

The blue jay is a passerine bird in the family Corvidae, native to eastern North America. It lives in most of the eastern and central United States; some eastern populations may be migratory. Resident populations are also in Newfoundland, Canada; breeding populations are found across southern Canada. It breeds in both deciduous and coniferous forests, and is common in residential areas. Its coloration is predominantly blue, with a white chest and underparts, and a blue crest; it has a black, U-shaped collar around its neck and a black border behind the crest. Males and females are similar in size and plumage, and plumage does not vary throughout the year. Four subspecies have been recognized.

<i>Aphelocoma</i> Genus of birds

The passerine birds of the genus Aphelocoma include the scrub jays and their relatives. They are New World jays found in Mexico, western Central America and the western United States, with an outlying population in Florida. This genus belongs to the group of New World jays–possibly a distinct subfamily–which is not closely related to other jays, magpies or treepies. They live in open pine-oak forests, chaparral, and mixed evergreen forests.

<span class="mw-page-title-main">Northern cardinal</span> Species of North American bird

The northern cardinal, known colloquially as the redbird, common cardinal, red cardinal, or just cardinal, is a bird in the genus Cardinalis. It can be found in southeastern Canada, through the eastern United States from Maine to Minnesota to Texas, New Mexico, southern Arizona, southern California, and south through Mexico, Belize, and Guatemala. It is also an introduced species in a few locations such as Bermuda and Hawaii. Its habitat includes woodlands, gardens, shrublands, and wetlands. It is the state bird of Illinois, Indiana, Kentucky, North Carolina, Ohio, Virginia, and West Virginia.

<span class="mw-page-title-main">Acorn woodpecker</span> Species of bird

The acorn woodpecker is a medium-sized woodpecker with a length of around 20 cm (8 in), and an average weight of 85 g (3.0 oz). It is found across Central America, as well as the western United States and parts of Colombia.

<span class="mw-page-title-main">Cooper's hawk</span> Species of bird

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<span class="mw-page-title-main">Island scrub jay</span> Species of bird

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<span class="mw-page-title-main">Mexican jay</span> Species of bird

The Mexican jay formerly known as the gray-breasted jay, is a New World jay native to the Sierra Madre Oriental, Sierra Madre Occidental, and Central Plateau of Mexico and parts of the southwestern United States. In May 2011, the American Ornithologists' Union voted to split the Mexican jay into two species, one retaining the common name Mexican jay and one called the Transvolcanic jay. The Mexican jay is a medium-sized jay with blue upper parts and pale gray underparts. It resembles the Woodhouse's scrub-jay, but has an unstreaked throat and breast. It feeds largely on acorns and pine nuts, but includes many other plant and animal foods in its diet. It has a cooperative breeding system where the parents are assisted by other birds to raise their young. This is a common species with a wide range and the International Union for Conservation of Nature has rated its conservation status as being of "least concern".

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The California scrub jay is a species of scrub jay native to western North America. It ranges from southern British Columbia throughout California and western Nevada near Reno to west of the Sierra Nevada. The California scrub jay was once lumped with Woodhouse's scrub jay and collectively called the western scrub jay. The group was also lumped with the island scrub jay and the Florida scrub jay; the taxon was then called simply scrub jay. The California scrub jay is nonmigratory and can be found in urban areas, where it can become tame and will come to bird feeders. While many refer to scrub jays as "blue jays", the blue jay is a different species of bird entirely.

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Florida scrub is a forest ecoregion found throughout Florida in the United States. It is found on coastal and inland sand ridges and is characterized by an evergreen xeromorphic plant community dominated by shrubs and dwarf oaks. Because the low-nutrient sandy soils do not retain moisture, the ecosystem is effectively an arid one. Wildfires infrequently occur in the Florida scrub. Most of the annual rainfall falls in summer.

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<span class="mw-page-title-main">Bushy-crested jay</span> Species of bird

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<span class="mw-page-title-main">Woodhouse's scrub jay</span> Species of bird

Woodhouse's scrub jay is a species of scrub jay native to western North America, ranging from southeastern Oregon and southern Idaho to central Mexico. Woodhouse's scrub jay was until recently considered the same species as the California scrub jay, and collectively called the western scrub jay. Prior to that both of them were also considered the same species as the island scrub jay and the Florida scrub jay; the taxon was then called simply the scrub jay. Woodhouse's scrub jay is nonmigratory and can be found in urban areas, where it can become tame and will come to bird feeders. While many refer to scrub jays as "blue jays", the blue jay is a different species of bird entirely. Woodhouse's scrub jay is named for the American naturalist and explorer Samuel Washington Woodhouse.

The Florida peninsula inland scrub is a shrubland community found on the Florida peninsula. The largest remaining blocks of inland scrub are in and around the Ocala National Forest and in the Lake Wales Ridge National Wildlife Refuge. The Archbold Biological Station near Lake Placid contains about 20 km2 (7.7 sq mi) of scrub habitat and sponsors biological research on it. The scrub occurs on a series of north-south running ridges composed of sand derived from ancient dune fields. The soil, a type of entisol, is derived from quartz and is low in organic matter, silt, and clay. Because the low-nutrient sandy soils do not retain moisture, the ecosystem is effectively an arid one.

Glen Everett Woolfenden (1930–2007) was an American ornithologist, known for his long-term study of the Florida scrub jay population at Archbold Biological Station near Lake Placid, Florida. He established what became "the longest continuous population study of any avian species that does not nest in boxes."

References

  1. 1 2 BirdLife International. (2016). Aphelocoma coerulescens. The IUCN Red List of Threatened Species doi:10.2305/IUCN.UK.2016-3.RLTS.T22705629A94028132.en.
  2. "NatureServe Explorer 2.0". explorer.natureserve.org. Retrieved 19 April 2022.
  3. Bartram, William (1791). Travels through North and South Carolina, Georgia, East and West Florida, the Cherokee Country, etc. Philadelphia, Pennsylvania, U.S.A.: James & Johnson. p.  290. ISBN   0-486-20013-2.
  4. Cynthia Berger (2004-08-01). "All-American Birds". Nwf.org. National Wildlife Federation. Archived from the original on 2017-10-01. Retrieved 2013-03-23.
  5. Emslie, Steven D. (1996). "A fossil scrub jay supports a recent systematic decision" (PDF). The Condor . 98 (4): 675–680. doi:10.2307/1369850. JSTOR   1369850.
  6. Rice, Nathan H.; Martínez-Meyer, Enrique; Peterson, A. Townsend (2003). "Ecological niche differentiation in the Aphelocoma jays: a phylogenetic perspective". Biological Journal of the Linnean Society . 80 (3): 369–383. doi: 10.1046/j.1095-8312.2003.00242.x .
  7. "Florida Scrub-Jay, Life History". All About Birds. Cornell University. Retrieved 2013-03-23.
  8. John B. Dunning Jr., ed. (1992). CRC Handbook of Avian Body Masses. CRC Press. ISBN   978-0-8493-4258-5.
  9. Albert C. Hine (2013). Geologic History of Florida: Major Events that Formed the Sunshine State. University Press of Florida. pp. 30–31. ISBN   978-0-8130-4421-7.
  10. "Florida sand pine scrub". Terrestrial Ecoregions. World Wildlife Fund. Retrieved 2009-07-28.
  11. "Plants of the Florida Scrub". The Florida Scrub. Floridata. Archived from the original on 2009-04-02. Retrieved 2009-07-28.
  12. "Taxonomy, Species Jay, Scrub, Florida". 1996-03-14. Archived from the original on 2004-02-25.
  13. Bowman, Reed (June 2003). "Apparent Cooperative Hunting in Florida Scrub-Jays". The Wilson Bulletin. 115 (2): 197–199. doi:10.1676/02-129. ISSN   0043-5643. S2CID   85703624.
  14. Mumme, Ronald (1992). "An experimental analysis in the Florida scrub jay". Behavioral Ecology and Sociobiology. 31: 319-328. doi:10.1007/BF00177772.
  15. Defenders of Wildlife (2020). "Climate Change and Florida Scrub Jays". LandScope America. Retrieved 2020-02-25.
  16. "Florida Scrub-Jay". Cornell University . Retrieved 2021-11-08.
  17. Lowman, Meg (2006-06-04). "NATURE'S SECRETS". Herald Tribune. Archived from the original on 2008-05-16. Retrieved 2009-02-20. People should never feed scrub jays. It is detrimental to their health, and it is also illegal!
  18. Sauter, Annette (2005). Shall We Feed Suburban Florida Scrub-Jays Aphelocoma coerulescens? (PDF) (Thesis). Archived from the original (PDF) on March 19, 2009. Retrieved 2009-02-20. Access to human provided foods causes a mismatch between brood demand and resources available for broods
  19. "Florida Scrub-Jay". Audubon WatchList. Archived from the original on 2008-06-15. Retrieved 2013-03-23.
  20. Boughton, Raoul K. & Bowman, Reed (9 May 2011). "State wide assessment of Florida Scrub-Jays on managed areas: A comparison of current populations to the results of the 1992-93 survey." (Report).

Further reading