Provided it survives its first year of life, a typical North American river otter will live to the age of 12, with some surviving longer. North American River Otter (Lontra … River otters are also valued as a game species and furbearer (Melquist et al. Recent releases totaling more than 1,000 otters have been made in Arizona, Colorado, Iowa, Kansas, Kentucky, Missouri, Nebraska, Oklahoma, Pennsylvania, Tennessee, and West Virginia in efforts to reestablish local populations. and are the smallest marine mammal in North America. Females are roughly one-third the size of males. These otters have brown-to-gray fur, and their undersides are a lighter, silvery shade. Mammals and birds are rarely eaten. Popular AMA APA ... R., O'Brien, M. and Evans, H., 2010. Different studies have placed the breeding season in winter, late spring and summer. In their role as predators, otters help regulate the local population of the organisms they consume. River otters have long, stiff and highly sensitive facial whiskers that aid in locating and capturing prey. Even when our gates are closed, we are still here, working as always to save species. The reproductive biology of river otters, as in other Mustelids, is unusual in that they exhibit delayed implantation. Seasonally, they may travel distances of 50 to 60 miles (80 to 96 km) along streams or lake shores, and their home ranges may be as large as 60 square miles (155 km2). River otters, like other social animals, have to carefully weigh the costs and benefits of hanging out in large groups. Are you a hunter? Unlike sea otters, river otters are capable of covering great distances on land. The playful North American river otter is equally at home in the water and on land. Adult river otters weigh 10 to 33 pounds (4.5 to 15 kilograms) and are about 2.5 to 5 feet (76 to 152 centimeters) in length. Despite their name, they inhabit more than just rivers. Two litters were reared with older siblings in the family group. The fertilized eggs float around in the uterus for about 9 months before implantation occurs, rather than implanting on the uterine wall shortly after fertilization. They habitually use specific sites (toilets) for defecation. Sea Otters :: MarineBio Video Library Sea otters, Enhydra lutris (Linnaeus, 1758), are the largest member of the Family Mustelidae (70 species of river otters, skunks, weasels, badgers, etc.) An adult North American river otter can weigh between 5.0 and 14 kg (11.0 and 30.9 lb). In colder climates, otters frequent rapids and waterfall areas that remain ice-free. Otters are playful creatures, frequently seen sliding down riverbanks or burrowing through snow. 1999) and released 346 river otter from 1994 to 1996 in central Illinois (Fig. Organize or attend a stream, river, lake or other waterway cleanup in your area to preserve aquatic habitats for local species. Protect local waterways by using fewer pesticides when caring for your garden or lawn. However, water pollution, uncontrolled trapping and severe habitat loss have reduced the number of river otters. When threatened or frightened, they emit a hair-raising scream that can be heard up to 1.5 miles (2.4 kilometers) across the water. Sexual maturity in young is believed to occur at about 2 years of age in females, but later in males. As prey, otters provide a great source of nutrients to animals that hunt them for food. The Giant otter, living in South America, and the largest of the otters in its total length, is the cousin of the sea and river otters in North America, Europe and Africa. The reproductive biology of river otters and all other weasels is complex because of a characteristic known as delayed implantation. The loss of ponds and other wetland habitat that resulted from the extirpation of beaver in the late 1800s may have adversely affected continental populations of river otters more than any other factor. Lutra canadensis Status . They occur at much higher densities in regions of the Great Lakes, in brackish marshes and inlets, and in other coastal habitats than farther inland. needs of otters are not supported by recent studies. Thus, river otters in this region appear to be making saltwater crossings of a few miles. They will also frequent unused or abandoned human structures or shelters. North American river otters, also called Canadian otters, have long, muscular, streamlined bodies with short legs and fully webbed feet bearing non-retractable claws. Our first goal for The River Otter Ecology Project was to convene a broadly-based group of experts in conservation, population biology, marine mammals, tracking and genomics to help guide our research. As of 2016, ROEP has catalogued more than 1,730 sightings and added to that tally close to 5,000 camera-trap videos and photos and roughly 1,300 samples of otter scat. River otters have been blamed for decimating game fish populations and are seen as a pest to eradicate by many game fishermen. Biology of the North American river otter Adult river otters weigh between 15 and 30 pounds and measure 84.34 cm (2.8 feet) to 137.16 cm (4.5 feet).1,2 Otters have adapted to their aquatic environment by de-veloping dense fur, large lungs, and webbed hind feet. We hope you will join us in this important work. General Biology, Reproduction, and Behavior, Best Practices for Nuisance Wildlife Control Operators. Claiming a territory about ten miles in diameter, it marked the area with its droppings about one to three miles apart and sets up three or four nests under rocks or inside bushes. The otter's ears and nostrils close underwater. North American river otters are known for their playful swimming, but they are also an important species for helping scientists understand the health of river systems. The otters typically capture prey in their mouths but occasionally use their thumbs and forepaws to grasp and manipulate prey. By comparing the Mitochondrial Cytochrome b Gene of a mummified Japanese river otter corpse with Eurasian otters from Latvia and China, it was proven that t… The sea otter is one of the smallest marine mammals, but one of the largest members of the weasel family, Mustelidae. River otters stay in family groups during the summer and early fall. Society for Conservation Biology North American River Otter (Lontra canadensis): A Technical Conservation Assessment Prepared for the USDA Forest Service, Rocky Mountain Region, Species Conservation Project September 2, 2006 Steve Boyle BIO-Logic Environmental 635 East Main Ste. They devour fish and other prey, keeping ecosystems balanced. Accumulation of mercury and selenium in the brain of river otters (Lontra canadensis) and wild mink (Mustela vison) from Nova Scotia, Canada. Washington, DC 20013. With a streamlined body and webbed feet, this otter is a great swi… With the tail's strong, undulating movement, a river otter propels itself through the water as fast as 8 miles (13 kilometers) pe… Size: to 30″ (body) Habitat: in and around water Notes: River otters are shy but playful creatures that spend much of their time just splashing around. They inhabit lakes, rivers, streams, bays, estuaries, and associated riparian habitats. By becoming a member, you'll help the Zoo save species and get great benefits for you and your family each time you visit! River otters occur throughout North America except the arctic slopes, the arid portions of the Southwest, and the intensive agricultural and industrialized areas of the Midwestern United States (Fig. A nocturnal creature, an otter only left its den after dark to forage for food. The teen’s mother, biology teacher Casina Ewert, ... One of the two domestic dogs that encountered the river otter was a puppy that had to be euthanized after the incident. 2 3 Boyle, S. (2006, September 2). Consumption of game fishes in comparison to nongame (rough) fishes is generally in proportion to the difficulty, or ease, with which they can be caught. River Otter. Socially, the basic group is the female and her offspring. The mean weights and sizes of river otters in southern latitudes tend to be lower than those in latitudes farther north. 216pp. During 2006, we conducted riparian surveys to detect river otter Lontra canadensis latrines at 15 bridge-suites along riverine habitats in southwestern Pennsylvania and western Maryland, USA. Between 1999 and 2004 a study into the behaviour and reproductive biology of a pair of Giant river otters was carried out at Cali Zoo. Their dense, short under-fur is overlain by darker, coarse guard hairs that help repel water. In South Carolina, they are common along waterways of the coastal plain. The diet of the river otter throughout its range is primarily fish. They have an elongated, thick, neck with long, narrow head and small eyes, small, tapering ear which is rounded at the tip, pointed, short tail; and broad, webbed feet. Their extirpation from many areas is believed to have been related more to poisoning by pesticides bio-magnified in fishes, and to the indirect adverse effects of water pollution on fish, their main food, than to excessive harvest. Research done in the early 1990s by the Department of Biology of Kochi University in Japan revealed some interesting facts about the genes of the Japanese River Otter. Otter skeleton sketch based on 1947 illustration . Their long, agile bodies enable them to quickly twist , turn, roll and dive, and they are frequently seen sliding or burrowing in the mud or snow. Answers: 3 on a question: River otters drink about 5 times as much water as a bald eagle drinks in a day. They spend a significant portion of the day scent marking territory by urinating, defecating, scratching and rubbing their scent glands on rocks and trees. Kristin Moore, a UNM undergrad, and Jerry Dragoo, a research assistant professor in UNM’s biology department, performed a DNA analysis to confirm or refute the field identification. River otters use their powerful hind feet to help with propulsion and their small, dexterous front feet for paddling through the water. 100 Montrose, CO 81401 . Breeding Biology A third eyelid, or nictitating membrane, protects the eye and allows the otter to see when swimming underwater. River otters exhibit a variety of vocalizations, ranging from whistles and buzzes to twitters, staccato chuckles, chirps and growls. An otter is muscular, streamlined and solidly built. While river otters tend to live alone or in pairs, they often socialize in groups and are known for their playful behavior. Although river otters weren’t seen and no tracks were found due to the terrain of the area, the evidence is solid. River Otter Habitats - Biology bibliographies - in Harvard style . An otter's tail is long and tapered, thickest where it joins the body and furred its entire length. Upon learning there was a need for volunteers with River Otter Ecology Project, I saw a chance to learn about the North American River Otter; not only to help chart the return of another otter species, but also, hopefully, help to prevent a recurrence of what I had observed all those years ago. “Everything on the landscape ends up in the water, and that is where otters live and eat. Female adults measure about 44 inches (112 cm) and weigh 19 pounds (8.6 kg). Their short but thick, soft fur is brown to almost black except on the chin, throat, cheeks, chest, and occasionally the belly, where it is usually lighter, varying from brown to almost beige. North American river otters are likely the most numerous of the otter species. 100 Montrose, CO 81401 Understanding river otter range, or the area that river otters inhabit, is an important tool to help us with land use planning, restoration decisions, and toxic spill planning and response. Otter births occur most frequently in March or April. Information about river otter breeding and reproductive and social behavior is varied due to the difficulty of studying these animals in the wild. Their webbed feet, streamlined bodies, and long, tapered tails enable them to move through water with agility, grace, and speed. They also receive mice, carrots, hard-boiled eggs, clams, crayfish, dry kibble, crickets and live fish for variety and enrichment. Otters are found from Newfoundland to Vancouver Island and north to Yukon Territory. Adopt a red panda to give the perfect gift to the animal lover in your life — even if that animal lover is you! The otters are thriving—the water is relatively clean, the populations of fish are good. The River Otter Ecology Project, a nonprofit organization studying river otter populations in Marin County, provided the otter videos from California. River otters usually mate in the months of March and April. At this point, they eat solid food but are not completely weaned for another month or two. The Basics. Click on an organ system below to see examples of everything from normal heart and lungs to lymphnodes and much more! While river otters tend to live alone or in pairs, they often socialize in groups and are known for their playful behavior. The tail is highly muscular and comprises up to 40 percent of the otter's total body length. Change style powered by CSL. The den is usually dug into the bank of a stream but can be an old beaver's lodge, muskrat house or hollow tree. They hunt singly or in pairs and although otters generally forage in water, they are equally at home on land, sometimes traveling between 10 and 18 miles (16 and 29 kilometers) in search of food. North American river otters get their boundless energy from their very high metabolism, which also requires that they eat a great deal during the day. Numerous species and varieties of fresh and anadromous fishes are eaten, but shell-fish, crayfish, amphibians, and reptiles are also frequently eaten, as are several species of crabs in coastal marshes. Gestation lasts about 60 days, and the young, called kits, are born almost 1 year after conception. Description. Otters are large weasel-like animals that have long bodies, small ears, a broad snout, short legs with webbed feet, and a long hair-covered tail that is wide at the body and narrows toward the tip. River Otter Habitats - Biology bibliographies - in Harvard style . Recent research, however, indicates that otters prefer slower moving, easier to catch fish, such as suckers and catfish found along river bottoms, and pose no threat to game fish. Popular AMA APA (6th edition) APA (7th edition) Chicago (17th edition, author-date) Harvard IEEE ISO 690 MHRA (3rd edition) MLA (8th edition) OSCOLA Turabian (9th edition) Vancouver. The North American river otter (Lontra canadensis), also known as the northern river otter or common otter, is a semiaquatic mammal endemic to the North American continent found in and along its waterways and coasts. What is clear is that there is a delayed implantation of nine to 11 months, with actual gestation taking about 60 days. Because of the availability of abundant alternate food species in warm water, losses of the warm water sport fishes are believed minor compared to losses river otters can inflict on cold water species such as trout and salmon. River otters are adaptable animals inhabiting a variety of aquatic habitats including ponds, rivers, and saltmarshes. Females have 4 mammae on the upper chest and are slightly smaller than males. FAST FACTS. They are found at the top of the food chain, and there is some evidence that their birth rates are reduced when pollution levels—including toxic chemicals, heavy metals, pesticides and agricultural wastes—build up. A mature male otter weighs 10 to 25 pounds and is 30 to 40 inches in length, plus a 12- to 15-inch tail. different regions. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture. Otters (both sea and river otters) play a notable role in the animal food chain. Males weigh 22-45 kg and are 1.2-1.5 m in length. Today, accidental trappings in beaver traps constitute the most otter fatalities. In response to this drop in population, regulations were put in place to reduce the amount being lost to … The Japanese river otter ... Ecology and biology Habits. Webbing is greatly reduced on the front feet. The river otter Lontra canadensis is an elusive species that can serve an important role in aquatic ecosystems as a top predator of fish and crayfish. They spend much of their time feeding and at what appears to be group play, repeatedly sliding down steep banks of mud or snow. Otters prefer shores of deep, clear water in lakes, rivers, marshes and ocean bays. The North American river otter (Lontra canadensis), also called the Canadian otter, is the most abundant species of otter.They are found throughout most of North America – from the Rio Grande in Northern Mexico to Canada and Alaska. While young otters swim naturally, the mother must coax them into the water for their first swim. Like other carnivores, their teeth are well adapted for grinding and crushing. Prior to our Otter Spotter community science effort beginning in 2012, river otters were not known to inhabit the SF Bay Area. “Otters need fresh water to keep their fur clean and to drink, but they’re very comfortable in any kind of water. The river otter food chain includes many types of fish, mollusks, crustaceans, aquatic plants and roots, eggs, and some small mammals and birds. Amphibious, muscular river otters swim gracefully and quickly underwater to catch prey, and they can run on land. The North American river otter is the most abundant otter species, but surprisingly little is known about its life in the wild. Habitat. otter biology and history ^ Otters were once plentiful across most of North America but due to trapping pressure in the late 1800’s and early 20th century, these numbers dwindled. Females are about 25 percent smaller than males. Tools, commonly rocks, may be used by some individuals to break into hard-shelled prey, especially marine snails. It makes its home in a burrow near the water's edge, and can thrive in river, lake, swamp, or estuary ecosystems. Female otters prepare dens that they keep scrupulously clean. How much water can a river otter drink in three days? Density & Home Range Size. Their precolonial range apparently included all of North America except the arid Southwest and the northernmost portions of Alaska and Canada. Range. Webbing is greatly reduced on the front feet. As our little bundle of joy explores his habitat, help us celebrate his milestones with a gift today! The river otter's eyes and ears are located high on its head for surface swimming. When Andrew Rutter took a full-time wildlife ecologist position at the Lake County Forest Preserves in 2017, he expected his work studying river otter ecology would come to an end. They have long, streamlined bodies, short legs, and a robust, tapered tail, all of which are well adapted to their mostly aquatic habitat. Find resources to engage learners in grades preK-12 with science, the natural world, wildlife and conservation. Their aquatic habitats can be both marine and fresh water: streams, rivers, lakes, ponds and marshes. State University of New York, College of Environmental Science and Forestry. The normal anatomy section of the Inner Otter features expert descriptions and high quality images of normal sea otter anatomy. Adult sea otters standard length is on average 4 ft. 3 in. River otters belong to the weasel family. The river otter (Lontra canadensis) is widely distributed across North America, from Florida to Alaska, and this large mustelid (weasel family) occupied every major waterway of the United States and Canada until at least the nineteenth century.By 1977, however, they occupied < 75% of their historic range due to draining of wetlands, overharvesting for fur, and pollution. The pelage(covering, or coat, of a mammal, whether of wool, fur, or hair) is brown or reddis… With the tail's strong, undulating movement, a river otter propels itself through the water as fast as 8 miles (13 kilometers) per hour and can easily dive to 36 feet (11 meters) or more. In some provinces and states, major otter re-introduction projects are underway with much success. As recently as the mid-1980s, more than 30,000 pelts were harvested annually. At the center of the range in California, sea otters spend 40-50% of each 24-hr period foraging, although in more recently occupied areas at the edge of the range they may feed as little as 20% of the time. Their sex can be readily distinguished by the presence of a baculum (penile bone). Following breeding and fertilization in spring, eggs (blastocysts) exist in a free-floating state until the following winter or early spring. river otter biology, habitat, history, resource value, and population management and provide direction for future management. 1) are best known for their continuous and playful behavior, their aesthetic value, and the value of their durable, high-quality fur. About River Otter Ecology Project. The Giant River Otter (Pteronura brasiliensis), often referred to as the river wolf, is a species in the Mustelid (weasel) family that is endemic to South America. 2). River otters leave scent marks on vegetation within their home range. The giant otter or giant river otter (Pteronura brasiliensis) is a South American carnivorous mammal. Known throughout much of their range as 'river wolf', they are amongst South America's top carnivores. A new study from North Carolina State University detected evidence of otter diseases that may be spread by pets. This work is supported by New Technologies for Agriculture Extension grant no. Otter Spotters help the River Otter Ecology Project keep track of the lively creatures, whose population was decimated by trappers and pollution. The Otter Project > about sea otters > biology of the southern sea otter biology of the southern sea otter . Following breeding and fertilization in spring, eggs (blastocysts) exist in a free-floating state until the following winter or early spring. Change style powered by CSL. Average life expectancy. males: 10 to 15 years; females: 15 to 20 years: Vocal behavior. It is encouraging to note that with these conservation programs, regulations on trapping and the improvement of water quality, the river otters are finally making a comeback in certain wetland areas. The male otter is generally chased away until the young are weaned and old enough to leave the riverbank, at which time they may return and help raise the pups. The Giant River Otter only lives in three river systems: the Amazon, Orinoco and La Plata. The reproductive biology of river otters and all other weasels is complex because of a characteristic known as delayed implantation. Vegetative cover and altitude do not appear to influence the river otter’s distribution as much as do good or adequate water quality, the availability of forage fish, and suitable denning sites. RIVER OTTER NETWORK: We are interested in describing the distribution and demography of otters on the coasts, wetlands and watersheds in Humboldt, Del Norte and adjacent counties. They remain as a family unit for seven to eight months or until the birth of a new litter. The majority of the animals in our study area shared space with at least 1 other animal at the core-area scale, and animals tended to be attracted to each other and were frequently located m close proximity to other otters. Sea otters feed on benthic invertebrates and typically dive to the bottom to forage, although they may also pull prey off emergent rocks, kelp stipes or kelp canopy. For many years, it was thought that the Japanese river otter was a subspecies of the Eurasian otter Lutra lutra. Pups grow rapidly and emerge from the den at about 2 months of age. Otter populations are confined to water courses, lakes, and wetlands, and therefore, population densities are lower than those of terrestrial species. Adirondack Mammals. Males have been recorded to travel up to 10 miles (16 km) in 1 night. You can be an incredible ally for conservation! A North American river otter's home range can be as large as 30 square miles (78 square kilometers), but a typical territory is 3 to 15 square miles (4.8 to 24 square kilometers). When a female otter is in her most fertile state it is referred to as estrus. Not only are we seeing the return of the River otter to many areas, but also that it is possible for humans and otters, to co-exist in the same areas. See more ideas about otters, otter love, river otter. Life history and biology of otters Recognizing good otter habitat Interpreting sign and assessing otter damage Trapping methods for wildlife damage management Techniques for preparing pelts for personal use or sale Should you need further help, a Missouri Department of Conservation wildlife damage biologist can assist you on site with your nuisance otter problems. Using fertilizers sparingly, keeping storm drains free of litter and picking up after your pet can also improve watershed health. Some studies indicate that river otters pair for only a few months during the breeding season and have no further strong bonds. River otters are chiefly nocturnal, but they frequently are active during day-light hours in undisturbed areas. It also serves as an information and education resource for Journal. Once they implant, fetal growth lasts 60 to 65 days until the kits are born, usually in spring (March through May) in most areas. The tail comprises less than a third of the body length. Captured prey are brought to the surface for consumption, with the abdomen used as a table. River otter were listed as endangered by the state of Illinois in 1989, with relict populations occurring in northwestern Illinois and extreme southern Illinois (Anderson 1995).The state recovery team, formed in 1993, developed a reintroduction program (Bluett et al. Increases in the range and numbers of river otters in response to the return of beaver has been dramatic, particularly in the southeastern United States. Natal dens tend to be located on small headwater branches or streams leading to major drainages or lakes. Oct 26, 2018 - Explore Lori Lee Rudy's board "River Otter", followed by 135 people on Pinterest. Estrus can last anywhere from 20-56 days. After the Clean Water Act of 1972, they It is the longest member of the weasel family, Mustelidae, a globally successful group of predators, reaching up to 1.7 metres (5.6 ft).Atypical of mustelids, the giant otter is a social species, with family groups typically supporting three to eight members. Biology of the North American river otter Adult river otters weigh between 15 and 30 pounds and measure 84.34 cm (2.8 feet) to 137.16 cm (4.5 feet).1,2 Otters have adapted to their aquatic environment by de-veloping dense fur, large lungs, and webbed hind feet. Otters reach sexual maturity at 2 to 3 years of age. The tail comprises less than a third of the body length. It represents our guide to managing otter populations in Pennsylvania for the next 10 years. Adult otter can be over 50 inches long and weigh up to 25 lbs. Usual mating rituals commence with rough play such as running, swimming, diving, and chasing. They weigh about 4 to 6 ounces (113 to 170 grams) at birth and measure 8 to 11 inches (20 to 28 centimeters). The male reproductive system contains a penis, testes, scrotum and more while the female reproductive system contains a vagina, ovaries, etc. River otters (Lutra canadensis, Fig. Now more than ever, we need your support. Otter fur is a rich, dark brown and is lighter on the … The oldest living river otter on record was 27 years old. These otters are frequently observed playing and sliding together. During the mid-80s, zoologists still regarded the European otter as a species on the verge of extinction. They live in riparian zones, often in the same areas as beavers. We are not announcing a reopening date at this time and will provide updates on our websites and social media. It represents our guide to managing otter populations in Pennsylvania for the next 10 years. On the website of her small nonprofit River Otter Ecology Project, the reports of sightings pour in, from anglers and dog-walkers and nature lovers and amazed suburbanites: Hey, I just saw an otter! They usually remain together as a family group though the fall and into the winter months. They are powerful swimmers and are continuously active, alert, and quick—characteristics that give them immense aesthetic and recreational value. River otters are top predators in North American wetland systems. The face is broad, and the eyes protrude slightly.
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