Category : Allegati4
Alligator management programs implemented by FWC emphasize the conservation of alligator populations for their ecological, aesthetic, and economic values while providing for public use and safety. The American alligator is classified by the US Fish and Wildlife Service as similarity of appearance to a threatened taxon. This listing provides federal protection for alligators but allows state-approved management and control programs.
This listing has been adopted by the State of Florida. Alligators can be legally taken only by individuals with proper licenses and permits. Alligators are opportunistic feeders. Their diets include prey species that are abundant and easily accessible. Juvenile alligators eat primarily insects, amphibians, small fish, and other invertebrates. Adult alligators eat rough fish, snakes, turtles, small mammals, and birds.
Go to the following links for more information:. Nearly all alligators become sexually mature by the time they reach approximately 7 feet in length although females can reach maturity at 6 feet.
A female may require years and a male years to reach these lengths. Courtship begins in early April, and mating occurs in May or June. Females build a mound nest of soil, vegetation, or debris and deposit an average of 32 to 46 eggs in late June or early July. Incubation requires approximately days, and hatching occurs from mid-August through early September. The average clutch size of an alligator nest is For nests that survive predators and flooding, an estimated 24 live hatchlings will emerge.
Only 10 alligator hatchlings will live to one year. Of these yearlings, 8 will become subadults reach 4 feet in length. The number of subadults that reach maturity 6 feet in length is approximately 5. These estimates are for a growing alligator population. As a population matures and has a higher percentage of large alligatorsthe survival rate would be expected to be lower, in part due to a higher rate of cannibalism.
Eggs: Alligator eggs are susceptible to drowning, being crushed by the female, predation, and other less common calamities. Raccoons are the primary predator, although hogs, otters, and bears have been reported to depredate nests. Juveniles: Small alligators are eaten by a variety of predators including raccoons, otters, wading birds, and fish; however, larger alligators may be their most significant predator.
Adults: Cannibalism, intraspecific fighting, and hunting by humans are probably the most significant mortality factors. Diseases and Parasites: Very little information is available in the scientific literature on wild alligator diseases and parasites.
They are not believed to be a significant problem for wild alligators. Alligators occur from southeast Oklahoma and east Texas on the western side of their range to North Carolina and Florida in the east.Alligators are absolutely amazing animals. They have been around for millions of years and are about as close as humans will ever get to seeing a living dinosaur.
They are nearly perfect animals for their environment, including U. On the other hand, alligators can be quite dangerous. They are instinctual living machines. An alligator's brain weighs only 8 or 9 grams and would take up only one-half of a tablespoon. This lack of brain power means there is no such thing as a "nice alligator. Pets and children who wander near an alligator pond are frequent victims of this instinctive behavior.
In this order are 23 different species, including the American alligator, Caimans and a variety of crocodiles. The basic Crocodylia body form has been around for over million years, making alligators and crocodiles living dinosaurs. All of these animals have the same basic layout: big heads, long, lizard-like bodies, four stubby legs and long tails.
Male alligators are, on average, about 11 feet 3. Females are, on average, about 8 feet long and weigh about half as much as male alligators. Males can actually get much larger -- 1, pounds is not unusual. At the Alligator Adventures alligator park in Myrtle Beach, SC, a very large crocodile named Utan weighs in at 2, pounds and is almost 20 feet long. He is claimed to be the largest living Crocodylian in captivity.
There is a nice interactive presentation on Utan available at the Alligator Adventures Web site.
Alligators are fresh-water animals and can be found in lakes, ponds, rivers and irrigation canals. Because they are cold-blooded reptiles, alligators are not big fans of cold weather. This limits their range to the warmer, wetter areas in the southeastern United States from Texas to North Carolina. While there are reports of one alligator, held in captivity, that lived to be well over years old, something like 40 years might be a more typical old age for alligators living in the wild.
For example, alligators are armor-plated. Bony plates inside the skin, called osteoderms or scutesmake the skin very hard to penetrate. When you look at the ridges on the back of an alligator, each little spike is made by a piece of bone in that section of skin. Click here to see a photo of typical osteoderms. Even though alligators are huge and cold-blooded, they can be quite fastwith a top speed of 11 MPH 17 KPH over short distances. For comparison, the fastest humans running at world-record times in a meter dash, are running about 20 MPH 32 KPHbut a typical adult human is no faster than an alligator.
This makes it possible for an alligator to escape from most situations on land and get into the water. Alligator eyes have two sets of eyelids. The outer lids are like human eyelids. They are made of skin and close top-to-bottom.
The inner lids are clear and close back-to-front. While an alligator is sitting about or swimming, these inner eyelids protect the alligator's eyes and provide clearer vision in the underwater environment. When swimming underwater, alligators are water tight. Flaps close off the ears and nostrils, the inner eyelids protect the eyes and a special flap called the palatal valve closes at the back of the throat to keep water out of the throat, stomach and lungs.
Alligators can stay underwater for quite a while. A typical dive might last 10 to 20 minutes.Alligatorgenus Alligatoreither of two crocodilians related to the tropical American caimans family Alligatoridae.
Alligators, like other crocodilians, are large animals with powerful tails that are used both in defense and in swimming. Their eyes, earsand nostrils are placed on top of their long head and project slightly above the water when the reptiles float at the surface, as they often do. Alligators can be differentiated from true crocodiles by the form of their jaw and teeth. Usually, no lower teeth are visible when the mouth is closed.
In contrast, true crocodiles have a narrow V-shaped snout, and the large fourth tooth on each side of the lower jaw projects outside the snout when the mouth is closed. Alligators are carnivorous and live along the edges of permanent bodies of water, such as lakesswampsand rivers.
They commonly dig burrows in which they rest and avoid weather extremes. The average life span of alligators is about 50 years in the wild. However, there have been reports of some specimens living beyond 70 years of age in captivity.
The American alligator Alligator mississippiensisthe larger of the two speciesis found in the southeastern United States. It is black with yellow banding when young and is generally brownish when adult. The maximum length is about 5. The American alligator has been hunted for its hide, and its young have been sold in large numbers as pets.
It disappeared from many areas where it was once abundant and was later given legal protection from hunters until it made an excellent comeback and limited hunting seasons were again established. The adult alligator feeds mainly on fishessmall mammalsand birds but may sometimes take prey as large as deer or cattle.
Members of both sexes hiss, and the males also give loud roars that carry over considerable distances. During the breeding season, the female builds a mound nest of detritus and vegetation in which she buries about 20 to 70 hard-shelled eggs. She guards the eggs and may at this time be dangerous.
Members of this species usually avoid humans. The Chinese alligator A. It is similar to the larger form but attains a maximum length of about 2. Article Media. Info Print Cite.All rights reserved. The American alligator is a rare success story of an endangered animal not only saved from extinction but now thriving. State and federal protections, habitat preservation efforts, and reduced demand for alligator products have improved the species' wild population to more than one million and growing today.
One look at these menacing predators—with their armored, lizard-like bodies, muscular tails, and powerful jaws—and it is obvious they are envoys from the distant past. The species, scientists say, is more than million years old, managing to avoid extinction 65 million years ago when their prehistoric contemporaries, the dinosaurs, died off. American alligators reside nearly exclusively in the freshwater rivers, lakes, swamps, and marshes of the southeastern United States, primarily Florida and Louisiana.
Heavy and ungainly out of water, these reptiles are supremely well adapted swimmers. Males average 10 to 15 feet in length and can weigh 1, pounds.
Females grow to a maximum of about 9. Hatchlings are 6 to 8 inches long with yellow and black stripes.
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Juveniles, which are on the menu for dozens of predators, including birds, raccoons, bobcats, and even other alligators, usually stay with their mothers for about two years. Adult alligators are apex predators critical to the biodiversity of their habitat.
They feed mainly on fish, turtles, snakes, and small mammals. However, they are opportunists, and a hungry gator will eat just about anything, including carrion, pets and, in rare instances, humans.
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Click Here to View All Videos. It traces the social history of the blues in America, from its birth in the rural South through the heyday of sound recordings. Noted blues scholar Paul Oliver draws on decades of research and personal interviews with performers -- some of whom he Chris Cain. Copperopolis, CA. Belleville, WI. Fargo, ND. Manchester, MA. Wichita, KS. Waukesha, WI. Superior, WI. Morgantown, WV. Sauk Rapids, MN. A Spin website.The American alligator Alligator mississippiensissometimes referred to colloquially as a gator or common alligatoris a large crocodilian reptile endemic to the Southeastern United States.
It is one of two extant species in the genus Alligator within the family Alligatoridae ; it is larger than the only other living alligator species, the Chinese alligator.
Adult male American alligators measure 3.Decreto-Legge 8 aprile 2020 n. 23 “Liquidità” - COMMENTO ED APPROFONDIMENTO (09/04/2020)
Females are smaller, measuring 2. It is distinguished from the sympatric American crocodile by its broader snout, with overlapping jaws and darker coloration, and is less tolerant of saltwater but more tolerant of cooler climates than the American crocodile, which is found only in tropical climates. American alligators are apex predators and consume fishamphibiansreptilesbirdsand mammals. Hatchlings feed mostly on invertebrates. They play an important role as ecosystem engineers in wetland ecosystems through the creation of alligator holes, which provide both wet and dry habitats for other organisms.
Throughout the year, in particular during the breeding season, American alligators bellow to declare territory and locate suitable mates. Eggs are laid in a nest of vegetation, sticks, leaves, and mud in a sheltered spot in or near the water. Young are born with yellow bands around their bodies and are protected by their mother for up to one year.
The conservation status of the American alligator is listed as least concern by the International Union for Conservation of Nature. Historically, hunting had decimated their population, and the American alligator was listed as an endangered species by the Endangered Species Act of Subsequent conservation efforts have allowed their numbers to increase and the species was removed from endangered status in The species is the official state reptile of three states: FloridaLouisianaand Mississippi.
InGeorges Cuvier created the genus Alligator ;  the American alligator shares this genus with the Chinese alligator. They are grouped in the family Alligatoridae with the caimans. The superfamily Alligatoroidea includes all crocodilians fossil and extant that are more closely related to the American alligator than to either the Nile crocodile or the gharial. Members of this superfamily first arose in the late Cretaceousabout —65 million years ago Mya.
Leidyosuchus of Alberta is the earliest known fossil, from the Campanian era 83 to 72 Mya. Fossil alligatoroids have been found throughout Eurasiabecause bridges across both the North Atlantic and the Bering Strait connected North America to Eurasia about 66 to 23 Mya.
Alligators and caimans split in North America during the late Cretaceous, and the caimans reached South America by the Paleogene, before the closure of the Isthmus of Panama during the Neogene period, from about 23 to 2. The Chinese alligator likely descended from a lineage that crossed the Bering land bridge during the Neogene. Fossils identical to the existing American alligator are found throughout the Pleistocenefrom 2.
Unlike the other extinct alligator species of the same genus, the fossil skull was virtually indistinguishable from that of the modern American alligator. This alligator and the American alligator are now considered to be sister taxa, meaning that the A.
The alligator's full mitochondrial genome was sequenced in the s, and it suggests the animal evolved at a rate similar to mammals and greater than birds and most cold-blooded vertebrates. Domestic American alligators range from long and slender to short and robust, possibly in response to variations in factors such as growth rate, diet, and climate.
The American alligator is a relatively large species of crocodilian. On average, it is the second-largest species in the family Alligatoridaebehind only the black caiman. Similar to many other reptiles that range expansively into temperate zones, American alligators from the northern end of their range, such as southern ArkansasAlabamaand northern North Carolinatend to reach smaller sizes. As with all crocodilians, and as opposed to many mammals where size eventually diminishes with old age, healthy American alligators may continue to grow throughout their lives and the oldest specimens are the largest.
Very old, large male American alligators reach an expected maximum size up to 4. American alligators do not normally reach such extreme sizes. In mature males, most specimens grow up to about 3. While noticeable in very mature specimens, the sexual dimorphism in size of this species is relatively modest among crocodilians.Dopo per ragioni di spazio il sito e' diventato www. DAL Che lo Spirito Santo porti buon senso e serenita' a tutti gli uomini di buona volonta'!
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How Alligators Work
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