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These advantages offset the high stress, physical exertion costs, and other risks of the migration. Predation can be heightened during migration: Eleonora's falcon Falco eleonorae, which breeds on Mediterranean islands, has a very late breeding season, coordinated with the autumn passage of southbound passerine migrant...
Within a species not all populations may be migratory; this is known as "partial migration". Partial migration is very common in the southern continents; in Australia, 44% of non-passerine birds and 32% of passerine species are partially migratory. In some species, the population at higher latitudes tends to be migrato...
Within a population, it is common for different ages and/or sexes to have different patterns of timing and distance. Female chaffinches Fringilla coelebs in Eastern Fennoscandia migrate earlier in the autumn than males do.
Most migrations begin with the birds starting off in a broad front. Often, this front narrows into one or more preferred routes termed flyways. These routes typically follow mountain ranges or coastlines, sometimes rivers, and may take advantage of updrafts and other wind patterns or avoid geographical barriers such as...
Many, if not most, birds migrate in flocks. For larger birds, flying in flocks reduces the energy cost. Geese in a V-formation may conserve 12–20% of the energy they would need to fly alone. Red knots Calidris canutus and dunlins Calidris alpina were found in radar studies to fly 5 km/h (3.1 mph) faster in flocks than ...
Birds fly at varying altitudes during migration. An expedition to Mt. Everest found skeletons of northern pintail Anas acuta and black-tailed godwit Limosa limosa at 5,000 m (16,000 ft) on the Khumbu Glacier. Bar-headed geese Anser indicus have been recorded by GPS flying at up to 6,540 metres (21,460 ft) while crossin...
Bird migration is not limited to birds that can fly. Most species of penguin (Spheniscidae) migrate by swimming. These routes can cover over 1,000 km (620 mi). Dusky grouse Dendragapus obscurus perform altitudinal migration mostly by walking. Emus Dromaius novaehollandiae in Australia have been observed to undertake lo...
The typical image of migration is of northern landbirds, such as swallows (Hirundinidae) and birds of prey, making long flights to the tropics. However, many Holarctic wildfowl and finch (Fringillidae) species winter in the North Temperate Zone, in regions with milder winters than their summer breeding grounds. For exa...
Often, the migration route of a long-distance migrator bird doesn't follow a straight line between breeding and wintering grounds. Rather, it could follow an hooked or arched line, with detours around geographical barriers. For most land-birds, such barriers could consist in seas, large water bodies or high mountain ra...
The same considerations about barriers and detours that apply to long-distance land-bird migration apply to water birds, but in reverse: a large area of land without bodies of water that offer feeding sites may also be a barrier to a bird that feeds in coastal waters. Detours avoiding such barriers are observed: for ex...
A similar situation occurs with waders (called shorebirds in North America). Many species, such as dunlin Calidris alpina and western sandpiper Calidris mauri, undertake long movements from their Arctic breeding grounds to warmer locations in the same hemisphere, but others such as semipalmated sandpiper C. pusilla tra...
For some species of waders, migration success depends on the availability of certain key food resources at stopover points along the migration route. This gives the migrants an opportunity to refuel for the next leg of the voyage. Some examples of important stopover locations are the Bay of Fundy and Delaware Bay.
Some bar-tailed godwits Limosa lapponica have the longest known non-stop flight of any migrant, flying 11,000 km from Alaska to their New Zealand non-breeding areas. Prior to migration, 55 percent of their bodyweight is stored as fat to fuel this uninterrupted journey.
Seabird migration is similar in pattern to those of the waders and waterfowl. Some, such as the black guillemot Cepphus grylle and some gulls, are quite sedentary; others, such as most terns and auks breeding in the temperate northern hemisphere, move varying distances south in the northern winter. The Arctic tern Ster...
The most pelagic species, mainly in the 'tubenose' order Procellariiformes, are great wanderers, and the albatrosses of the southern oceans may circle the globe as they ride the "roaring forties" outside the breeding season. The tubenoses spread widely over large areas of open ocean, but congregate when food becomes av...
Some large broad-winged birds rely on thermal columns of rising hot air to enable them to soar. These include many birds of prey such as vultures, eagles, and buzzards, but also storks. These birds migrate in the daytime. Migratory species in these groups have great difficulty crossing large bodies of water, since ther...
Many of the smaller insectivorous birds including the warblers, hummingbirds and flycatchers migrate large distances, usually at night. They land in the morning and may feed for a few days before resuming their migration. The birds are referred to as passage migrants in the regions where they occur for short durations ...
Nocturnal migrants minimize predation, avoid overheating, and can feed during the day. One cost of nocturnal migration is the loss of sleep. Migrants may be able to alter their quality of sleep to compensate for the loss.
Many long-distance migrants appear to be genetically programmed to respond to changing day length. Species that move short distances, however, may not need such a timing mechanism, instead moving in response to local weather conditions. Thus mountain and moorland breeders, such as wallcreeper Tichodroma muraria and whi...
Short-distance passerine migrants have two evolutionary origins. Those that have long-distance migrants in the same family, such as the common chiffchaff Phylloscopus collybita, are species of southern hemisphere origins that have progressively shortened their return migration to stay in the northern hemisphere.
Species that have no long-distance migratory relatives, such as the waxwings Bombycilla, are effectively moving in response to winter weather and the loss of their usual winter food, rather than enhanced breeding opportunities.
In the tropics there is little variation in the length of day throughout the year, and it is always warm enough for a food supply, but altitudinal migration occurs in some tropical birds. There is evidence that this enables the migrants to obtain more of their preferred foods such as fruits.
Sometimes circumstances such as a good breeding season followed by a food source failure the following year lead to irruptions in which large numbers of a species move far beyond the normal range. Bohemian waxwings Bombycilla garrulus well show this unpredictable variation in annual numbers, with five major arrivals in...
Bird migration is primarily, but not entirely, a Northern Hemisphere phenomenon. This is because land birds in high northern latitudes, where food becomes scarce in winter, leave for areas further south (including the Southern Hemisphere) to overwinter, and because the continental landmass is much larger in the Norther...
The control of migration, its timing and response are genetically controlled and appear to be a primitive trait that is present even in non-migratory species of birds. The ability to navigate and orient themselves during migration is a much more complex phenomenon that may include both endogenous programs as well as le...
The primary physiological cue for migration are the changes in the day length. These changes are also related to hormonal changes in the birds. In the period before migration, many birds display higher activity or Zugunruhe (German: migratory restlessness), first described by Johann Friedrich Naumann in 1795, as well a...
In polygynous species with considerable sexual dimorphism, males tend to return earlier to the breeding sites than their females. This is termed protandry.
Navigation is based on a variety of senses. Many birds have been shown to use a sun compass. Using the sun for direction involves the need for making compensation based on the time. Navigation has also been shown to be based on a combination of other abilities including the ability to detect magnetic fields (magnetocep...
Long distance migrants are believed to disperse as young birds and form attachments to potential breeding sites and to favourite wintering sites. Once the site attachment is made they show high site-fidelity, visiting the same wintering sites year after year.
The ability of birds to navigate during migrations cannot be fully explained by endogenous programming, even with the help of responses to environmental cues. The ability to successfully perform long-distance migrations can probably only be fully explained with an accounting for the cognitive ability of the birds to re...
Migratory birds may use two electromagnetic tools to find their destinations: one that is entirely innate and another that relies on experience. A young bird on its first migration flies in the correct direction according to the Earth's magnetic field, but does not know how far the journey will be. It does this through...
Migrating birds can lose their way and appear outside their normal ranges. This can be due to flying past their destinations as in the "spring overshoot" in which birds returning to their breeding areas overshoot and end up further north than intended. Certain areas, because of their location, have become famous as wat...
Reverse migration, where the genetic programming of young birds fails to work properly, can lead to rarities turning up as vagrants thousands of kilometres out of range.
A related phenomenon called "abmigration" involves birds from one region joining similar birds from a different breeding region in the common winter grounds and then migrating back along with the new population. This is especially common in some waterfowl, which shift from one flyway to another.
It has been possible to teach a migration route to a flock of birds, for example in re-introduction schemes. After a trial with Canada geese Branta canadensis, microlight aircraft were used in the US to teach safe migration routes to reintroduced whooping cranes Grus americana.
Birds need to alter their metabolism in order to meet the demands of migration. The storage of energy through the accumulation of fat and the control of sleep in nocturnal migrants require special physiological adaptations. In addition, the feathers of a bird suffer from wear-and-tear and require to be molted. The timi...
Migration in birds is highly labile and is believed to have developed independently in many avian lineages. While it is agreed that the behavioral and physiological adaptations necessary for migration are under genetic control, some authors have argued that no genetic change is necessary for migratory behavior to devel...
Theoretical analyses show that detours that increase flight distance by up to 20% will often be adaptive on aerodynamic grounds - a bird that loads itself with food to cross a long barrier flies less efficiently. However some species show circuitous migratory routes that reflect historical range expansions and are far ...
Large scale climatic changes, as have been experienced in the past, are expected to have an effect on the timing of migration. Studies have shown a variety of effects including timing changes in migration, breeding as well as population variations.
The migration of birds also aids the movement of other species, including those of ectoparasites such as ticks and lice, which in turn may carry micro-organisms including those of concern to human health. Due to the global spread of avian influenza, bird migration has been studied as a possible mechanism of disease tra...
Some predators take advantage of the concentration of birds during migration. Greater noctule bats feed on nocturnal migrating passerines. Some birds of prey specialize on migrating waders.
Bird migration routes have been studied by a variety of techniques including the oldest, marking. Swans have been marked with a nick on the beak since about 1560 in England. Scientific ringing was pioneered by Hans Christian Cornelius Mortensen in 1899. Other techniques include radar and satellite tracking.
Orientation behaviour studies have been traditionally carried out using variants of a setup known as the Emlen funnel, which consists of a circular cage with the top covered by glass or wire-screen so that either the sky is visible or the setup is placed in a planetarium or with other controls on environmental cues. Th...
Hunting along migration routes threatens some bird species. The populations of Siberian cranes (Leucogeranus leucogeranus) that wintered in India declined due to hunting along the route, particularly in Afghanistan and Central Asia. Birds were last seen in their favourite wintering grounds in Keoladeo National Park in ...
It is on Absecon Island, on the Atlantic coast. Atlantic City was incorporated on May 1, 1854, from portions of Egg Harbor Township and Galloway Township. The city borders Absecon, Brigantine, Pleasantville, Ventnor City and West Atlantic City.
Because of its location in South Jersey, hugging the Atlantic Ocean between marshlands and islands, Atlantic City was viewed by developers as prime real estate and a potential resort town. In 1853, the first commercial hotel, The Belloe House, located at Massachusetts and Atlantic Avenue, was built.
The city was incorporated in 1854, the same year in which the Camden and Atlantic Railroad train service began. Built on the edge of the bay, this served as the direct link of this remote parcel of land with Philadelphia, Pennsylvania. That same year, construction of the Absecon Lighthouse, designed by George Meade of ...
The first boardwalk was built in 1870 along a portion of the beach in an effort to help hotel owners keep sand out of their lobbies. Businesses were restricted and the boardwalk was removed each year at the end of the peak season. Because of its effectiveness and popularity, the boardwalk was expanded in length and wid...
The first road connecting the city to the mainland at Pleasantville was completed in 1870 and charged a 30-cent toll. Albany Avenue was the first road to the mainland that was available without a toll.
By 1878, because of the growing popularity of the city, one railroad line could no longer keep up with demand. Soon, the Philadelphia and Atlantic City Railway was also constructed to transport tourists to Atlantic City. At this point massive hotels like The United States and Surf House, as well as smaller rooming hous...
In the early part of the 20th century, Atlantic City went through a radical building boom. Many of the modest boarding houses that dotted the boardwalk were replaced with large hotels. Two of the city's most distinctive hotels were the Marlborough-Blenheim Hotel and the Traymore Hotel.
In 1903, Josiah White III bought a parcel of land near Ohio Avenue and the boardwalk and built the Queen Anne style Marlborough House. The hotel was a hit and, in 1905–06, he chose to expand the hotel and bought another parcel of land next door to his Marlborough House. In an effort to make his new hotel a source of co...
The Traymore Hotel was located at the corner of Illinois Avenue and the boardwalk. Begun in 1879 as a small boarding house, the hotel grew through a series of uncoordinated expansions. By 1914, the hotel's owner, Daniel White, taking a hint from the Marlborough-Blenheim, commissioned the firm of Price and McLanahan to ...
One by one, additional large hotels were constructed along the boardwalk, including the Brighton, Chelsea, Shelburne, Ambassador, Ritz Carlton, Mayflower, Madison House, and the Breakers. The Quaker-owned Chalfonte House, opened in 1868, and Haddon House, opened in 1869, flanked North Carolina Avenue at the beach end. ...
In 1883, salt water taffy was conceived in Atlantic City by David Bradley. The traditional story is that Bradley's shop was flooded after a major storm, soaking his taffy with salty Atlantic Ocean water. He sold some "salt water taffy" to a girl, who proudly walked down to the beach to show her friends. Bradley's mothe...
The 1920s, with tourism at its peak, are considered by many historians as Atlantic City's golden age. During Prohibition, which was enacted nationally in 1919 and lasted until 1933, much liquor was consumed and gambling regularly took place in the back rooms of nightclubs and restaurants. It was during Prohibition that...
During this time, Atlantic City was under the mayoral reign of Edward L. Bader, known for his contributions to the construction, athletics and aviation of Atlantic City. Despite the opposition of many others, he purchased land that became the city's municipal airport and high school football stadium, both of which were...
From May 13 to May 16 in 1929, Johnson hosted a conference for organized crime figures from all across America. The men who called this meeting were Masseria family lieutenant Charles "Lucky" Luciano and former Chicago South Side Gang boss Johnny "the Fox" Torrio, with heads of the Bugs and Meyer Mob, Meyer Lansky and ...
Like many older east coast cities after World War II, Atlantic City became plagued with poverty, crime, corruption, and general economic decline in the mid-to-late 20th century. The neighborhood known as the "Inlet" became particularly impoverished. The reasons for the resort's decline were multi-layered. First of all,...
The city hosted the 1964 Democratic National Convention which nominated Lyndon Johnson for President and Hubert Humphrey as Vice President. The convention and the press coverage it generated, however, cast a harsh light on Atlantic City, which by then was in the midst of a long period of economic decline. Many felt tha...
By the late 1960s, many of the resort's once great hotels were suffering from embarrassing vacancy rates. Most of them were either shut down, converted to cheap apartments, or converted to nursing home facilities by the end of the decade. Prior to and during the advent of legalized gaming, many of these hotels were dem...
In an effort at revitalizing the city, New Jersey voters in 1976 passed a referendum, approving casino gambling for Atlantic City; this came after a 1974 referendum on legalized gambling failed to pass. Immediately after the legislation passed, the owners of the Chalfonte-Haddon Hall Hotel began converting it into the ...
With the redevelopment of Las Vegas and the opening of two casinos in Connecticut in the early 1990s, along with newly built casinos in the nearby Philadelphia metro area in the 2000s, Atlantic City's tourism began to decline due to its failure to diversify away from gaming. Determined to expand, in 1999 the Atlantic C...
Although Wynn's plans for development in the city were scrapped in 2002, the tunnel opened in 2001. The new roadway prompted Boyd Gaming in partnership with MGM/Mirage to build Atlantic City's newest casino. The Borgata opened in July 2003, and its success brought an influx of developers to Atlantic City with plans for...
Owing to economic conditions and the late 2000s recession, many of the proposed mega casinos never went further than the initial planning stages. One of these developers was Pinnacle Entertainment, who purchased the Sands Atlantic City, only to close it permanently November 11, 2006. The following year, the resort was ...
In 2006, Morgan Stanley purchased 20 acres (8.1 ha) directly north of the Showboat Atlantic City Hotel and Casino for a new $2 billion plus casino resort. Revel Entertainment Group was named as the project's developer for the Revel Casino. Revel was hindered with many problems, with the biggest setback to the company b...
In the wake of the closures and declining revenue from casinos, Governor Christie said in September 2014 that the state would consider a 2015 referendum to end the 40-year-old monopoly that Atlantic City holds on casino gambling and allowing gambling in other municipalities. With casino revenue declining from $5.2 bill...
"Superstorm Sandy" struck Atlantic City on October 29, 2012, causing flooding and power-outages but left minimal damage to any of the tourist areas including the Boardwalk and casino resorts, despite widespread belief that the city's boardwalk had been destroyed. The source of the misinformation was a widely circulated...
According to the United States Census Bureau, the city had a total area of 17.037 square miles (44.125 km2), including 10.747 square miles (27.835 km2) of land and 6.290 square miles (16.290 km2) of water (36.92%).
Unincorporated communities, localities and place names located partially or completely within the city include Chelsea, City Island, Great Island and Venice Park.
Summers are typically warm and humid with a July daily average of 75.6 °F (24.2 °C). During this time, the city gets a sea breeze off the ocean that often makes daytime temperatures much cooler than inland areas, making Atlantic City a prime place for beating the summer heat from June through September. Average highs e...
Annual precipitation is 40 inches (1,020 mm) which is fairly spread throughout the year. Owing to its proximity to the Atlantic Ocean and its location in South Jersey, Atlantic City receives less snow than a good portion of the rest of New Jersey. Even at the airport, where low temperatures are often much lower than al...
At the 2010 United States Census, there were 39,558 people, 15,504 households, and 8,558 families residing in the city. The population density was 3,680.8 per square mile (1,421.2/km2). There were 20,013 housing units at an average density of 1,862.2 per square mile (719.0/km2). The racial makeup of the city was 26.65%...
There were 15,504 households, of which 27.3% had children under the age of 18 living with them, 25.9% were married couples living together, 22.2% had a female householder with no husband present, and 44.8% were non-families. 37.5% of all households were made up of individuals, and 14.3% had someone living alone who was...
In the city, 24.6% of the population were under the age of 18, 10.2% from 18 to 24, 26.8% from 25 to 44, 25.8% from 45 to 64, and 12.7% who were 65 years of age or older. The median age was 36.3 years. For every 100 females there were 96.2 males. For every 100 females age 18 and over, there were 94.4 males.
The Census Bureau's 2006–2010 American Community Survey showed that (in 2010 inflation-adjusted dollars) median household income was $30,237 (with a margin of error of +/- $2,354) and the median family income was $35,488 (+/- $2,607). Males had a median income of $32,207 (+/- $1,641) versus $29,298 (+/- $1,380) for fem...
As of the 2000 United States Census there were 40,517 people, 15,848 households, and 8,700 families residing in the city. The population density was 3,569.8 people per square mile (1,378.3/km2). There were 20,219 housing units at an average density of 1,781.4 per square mile (687.8/km2). The racial makeup of the city w...
There were 15,848 households out of which 27.7% had children under the age of 18 living with them, 24.8% were married couples living together, 23.2% had a female householder with no husband present, and 45.1% were non-families. 37.2% of all households were made up of individuals and 15.4% had someone living alone who w...
In the city the population was spread out with 25.7% under the age of 18, 8.9% from 18 to 24, 31.0% from 25 to 44, 20.2% from 45 to 64, and 14.2% who were 65 years of age or older. The median age was 35 years. For every 100 females there were 96.1 males. For every 100 females age 18 and over, there were 93.2 males.
The median income for a household in the city was $26,969, and the median income for a family was $31,997. Males had a median income of $25,471 versus $23,863 for females. The per capita income for the city was $15,402. About 19.1% of families and 23.6% of the population were below the poverty line, including 29.1% of ...
As of September 2014, the greater Atlantic City area has one of the highest unemployment rates in the country at 13.8%, out of labor force of around 141,000.
In July 2010, Governor Chris Christie announced that a state takeover of the city and local government "was imminent". Comparing regulations in Atlantic City to an "antique car", Atlantic City regulatory reform is a key piece of Gov. Chris Christie's plan, unveiled on July 22, to reinvigorate an industry mired in a fou...
On April 29, 2011, the boundaries for the state-run tourism district were set. The district would include heavier police presence, as well as beautification and infrastructure improvements. The CRDA would oversee all functions of the district and will make changes to attract new businesses and attractions. New construc...
The tourism district would comprise several key areas in the city; the Marina District, Ducktown, Chelsea, South Inlet, Bader Field, and Gardner's Basin. Also included are 10 roadways that lead into the district, including several in the city's northern end, or North Beach. Gardner's Basin, which is home to the Atlanti...
Atlantic City is considered as the "Gambling Capital of the East Coast," and currently has eight large casinos and several smaller ones. In 2011, New Jersey's casinos employed approximately 33,000 employees, had 28.5 million visitors, made $3.3 billion in gaming revenue, and paid $278 million in taxes. They are regulat...
In the wake of the United States' economic downturn and the legalization of gambling in adjacent and nearby states (including Delaware, Maryland, New York, and Pennsylvania), four casino closures took place in 2014: the Atlantic Club on January 13; the Showboat on August 31; the Revel, which was Atlantic City's second-...
Executives at Trump Entertainment Resorts, whose sole remaining property will be the Trump Taj Mahal, said in 2013 that they were considering the option of selling the Taj and winding down and exiting the gaming and hotel business.
Caesars Entertainment executives have been reconsidering the future of their three remaining Atlantic City properties (Bally's, Caesars and Harrah's), in the wake of a Chapter 11 bankruptcy filing by the company's casino operating unit in January 2015.
Boardwalk Hall, formally known as the "Historic Atlantic City Convention Hall", is an arena in Atlantic City along the boardwalk. Boardwalk Hall was Atlantic City's primary convention center until the opening of the Atlantic City Convention Center in 1997. The Atlantic City Convention Center includes 500,000 sq ft (46,...
Atlantic City (sometimes referred to as "Monopoly City") has become well-known over the years for its portrayal in the U.S. version of the popular board game, Monopoly, in which properties on the board are named after locations in and near Atlantic City. While the original incarnation of the game did not feature Atlant...
Marvin Gardens, the leading yellow property on the board shown, is actually a misspelling of the original location name, "Marven Gardens". The misspelling was said to have been introduced by Charles Todd and passed on when his home-made Monopoly board was copied by Charles Darrow and thence Parker Brothers. It was not ...
Immunology is a branch of biomedical science that covers the study of immune systems in all organisms. It charts, measures, and contextualizes the: physiological functioning of the immune system in states of both health and diseases; malfunctions of the immune system in immunological disorders (such as autoimmune disea...
Prior to the designation of immunity from the etymological root immunis, which is Latin for "exempt"; early physicians characterized organs that would later be proven as essential components of the immune system. The important lymphoid organs of the immune system are the thymus and bone marrow, and chief lymphatic tiss...
Many components of the immune system are typically cellular in nature and not associated with any specific organ; but rather are embedded or circulating in various tissues located throughout the body.
Classical immunology ties in with the fields of epidemiology and medicine. It studies the relationship between the body systems, pathogens, and immunity. The earliest written mention of immunity can be traced back to the plague of Athens in 430 BCE. Thucydides noted that people who had recovered from a previous bout of...
The study of the molecular and cellular components that comprise the immune system, including their function and interaction, is the central science of immunology. The immune system has been divided into a more primitive innate immune system and, in vertebrates, an acquired or adaptive immune system. The latter is furt...
The humoral (antibody) response is defined as the interaction between antibodies and antigens. Antibodies are specific proteins released from a certain class of immune cells known as B lymphocytes, while antigens are defined as anything that elicits the generation of antibodies ("anti"body "gen"erators). Immunology res...
Immunological research continues to become more specialized, pursuing non-classical models of immunity and functions of cells, organs and systems not previously associated with the immune system (Yemeserach 2010).
Clinical immunology is the study of diseases caused by disorders of the immune system (failure, aberrant action, and malignant growth of the cellular elements of the system). It also involves diseases of other systems, where immune reactions play a part in the pathology and clinical features.
Other immune system disorders include various hypersensitivities (such as in asthma and other allergies) that respond inappropriately to otherwise harmless compounds.

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