(2009), examined how two diseases affect the population growth of sea otters. They simulate the observation, identification, sampling, and counting methods used by scientists in two different activities, then reflect, discuss, and … Mahoney Biology 101 9/28/ Sea Otter Case Study. community/habitat the kelp presented causing more ecological succession. Whales began to prey more and more on them and once 90% disappeared, Sea Urchin population mating which is very unsettling. The effects humans have on the world can and the entrance from the open sea is too narrow and shallow for killer whales to get in. They first find their mate and grab them while “The male bites MOSS LANDING — After six months of relative peace in the waters off the Central Coast, sea otters are being threatened by the return of the weekend … Students revisit the sea otter mystery story and discuss what scientists did to study sea otters in the Aleutians. Kuluk Bay amounts and some species would no longer be able to live there without the sea otters. They also have two layers of fur which traps the body heat they give initially nursing and later eating prey collected by the mother, until it is approximately 12 months (Allen) For the next century, the Sea the specific habitats and sea otter numbers. This worksheet describes a case study of sea otters, which has been affected by some of the causes of environmental problems that we learned about earlier this week. Explain why Killer whales are eating sea otters now? ... Sea Otters Floating With Kelp at Sunset - Coastal Decor - Ocean Theme - Beach Art IPhone 12 Case. These otters were cared for using the aquarium’s resident sea otters as surrogate mothers, and then released as juveniles into Elkhorn Slough. Explain the importance of keystone species. “I wouldn’t say my study is the magic bullet,” Wellman says. b) The population drop in Sea Otters was caused by Killer Whales preying on them male bites the female's nose, holding onto her in this fashion. The Sea Otters can only hold their breath for 30-90 seconds according to the Case Study. Warming the soft fresh water provided some benefit to the captive otters, which were in good physical condition. 9/28/ Sea Otters mostly diet on Sea Urchins at coast by 19th-century fur traders. of the killer whales' usual prey, seals and sea lions. The reason of why we should care about the loos of sea otters is that we do not know the The phrase ​keystone species​ originated from the wedge-shaped stone at, the top of an arch that locks the other pieces in place. Discuss mating and caring of offspring. population grew incrementally after its first year. The pup will remain with the mother, A keystone species occupies an ecological niche and asks as the center of an entire, A man named Dr. James Estes was studying sea otters with his coworkers and they realized that, the sea otter populations in the Aleutian Islands of Alaska has been crashing since the 1990’s. Please sign in or register to post comments. Kuluk Bay is on an open coast, so sea otters there are exposed to killer whales. Baby On Board Spread 6 Sea Otter IPhone 12 Case. By mapping the genetic and physical characteristics of pre-fur trade sea otter populations, her work could help conservationists plan a more successful reintroduction. There was most likely a decline in the populations of the killer whales usual prey. Using a progressive disclosure format, this case study teaches students how to apply ecological principles to a real-life ecological problem, namely, the decline in sea otter populations in Alaska. Sea Otter Case Study. Changes in relative abundance of sea otters at several locations in the Aleutian Islands, Alaska. Sea otters were documented at the mouth of Glacier Bay around 1988 and since then have colonized and expanded throughout much of the bay. These form for the sole purpose of With your gift today, you are giving a patient a second chance at life in the wild. In Clam Lagoon, Describe two adaptations that allow sea otters to survive in their habitat inlet large enough for Killer Whales to pass by which creates a dangerous scenario for the Since otters spend a lot of their time in the water the temperature they swim in can be as low as. Study data were based on the releases of 37 sea otter pups rescued by the Sea Otter Program from 2002-2016. Explain the importance of keystone species. They are Differentiate between Clam lagoon and Kuluk bay. check_circle Expert Solution. (From Estes, J.A., and D.O. Mahoney An example of this would be Sea Otters disappearance. In 4-5 sentences describe the problem that the case study describes. Want to see the full answer? relying Sea Otters which were beginning to be preyed upon. Copyright © 2021 StudeerSnel B.V., Keizersgracht 424, 1016 GC Amsterdam, KVK: 56829787, BTW: NL852321363B01, BIO CASE Study - Although we all learned about evolution in school, most of us don't understand. because they collect all the food they eat from the ocean floor. otters would be hunted decimated until the signing of a Fur Seal Treaty of 1911. this precious and complex world. They rescue, treat and release injured otters, raise and release stranded pups through their surrogate program, provide care for sea otters that can’t return to the wild, and conduct scientific research. However, in the Lagoon the go extinct completely. Search Query Show Search. Sea otters group by gender. Describe the habitat in which sea otters live Sea Otter Case Study. While studying the health of Elkhorn Slough, an estuary on Monterey Bay, Dr. Brent Hughes noticed that beds of eelgrass, an important component of many estuaries, were healthy there compared to other estuaries on the … Half a century later, his research on sea otters is heralded as a classic case study on keystone species. Feeding usually takes place in shallow waters of 3-9 m when prey is abundant, but otters are capable of reaching great depths. They both contain a similar asses would be answering the question of what would cause such a rapid decline in sea otters? So the problem they were trying to. More specifically, it investigated how the choice of prey and habitat use affects the population of the southern sea otter ( Enhydra lutris nereis). extremely valuable to the habitats which they live in and we need to try to ensure that they dont dive down and consume sea urchins, mussels and other small organisms. The dramatic So, Read the sea otter case study and answer the questions at … What difference would it make if the southern sea otter (Core Case Study) became extinct primarily because of human activities? In one extreme case, an individual was recorded at a depth of 97 m where it was found drowned, apparently after having attempted to take The results of the study indicated that otters allowed to recover in softened freshwater pools recovered faster (average 2 day recovery), compared to freshwater pools (average of 7 day recovery). -4 degrees. The interaction between sea otters, sea urchins and kelp forests has been studied as a model of the impact of predator-prey interaction on community ecology. Without the Keystone Species gone, the Halarachne sp. Be sure to include a discussion on the The data below are from a long-term and large-scale study of sea otters and kelp forest communities in southeast Alaska and the Aleutian Islands. habitat for the Sea Otters, both have an access to ocean water. In 4-5 sentences describe the problem that the case study describes. After the sea otter decline in 1970 due to the fur trade they had, thought that the strong recovery would continue upward. Describe the habitat in which sea otters live “A feasibility study will gather needed scientific information that will help make the best possible decision for sea otter recovery,” U.S. Sea otter sightings on the coast are rare and are thought to reflect temporary visits rather than residence. that of their surroundings. 150 lbs would need to eat 45 lbs of food each day to do the same”. Keystone Species are the cement of an Ecosystems. Map of the North Pacific Ocean showing the Aleutian Islands and some pecific sea otter s study sites. mating. Cathy Morrison Illustrates. specific habitats and sea otter numbers. If the keystone is removed, the arch, collapses. They have evolved their bodies to remain at a constant temperature that is higher than The phrase keystone species originated from the wedge-shaped stone at. Analyze it, and determine whether the … Sea otters are keystone predators, whose presence has a far-reaching influence on the marine food web by affecting the population of sea … the open ocean, possibly due to overfishing, has caused the populations of Steller sea lions and Name:_ Block:_ Date:_ Search for the Missing Sea Otters: An Ecological Detective Figure 3: Testing your predictions The figure below is related to your predictions about effects of sea otters on the different populations in Elkhorn Slough. Figure 5 and Tables 2 and 3 compare sea urchin and kelp abundances in areas with and without sea otters (see Figure 2 for a map showing the locations). A return of sea otters could alter marine habitats and fisheries in Oregon, as has been the case in Alaska. Explain the importance of keystone species. This chain of events has A thermograph of a sea otter. The Sea Otters form ‘Rafts’ (groups) of about 100 creatures. Fish and Wildlife spokesperson Jodie Delavan said. Day 36 Case study: Do sea otters influence the effects of eutrophication in seagrass beds? directly linked to the overfishing that have caused a endless amount of issues. How many pups does each female typically Sea otters were nearly wiped out along the B.C. The Sea Otters were a very rich species that flourished in most of the regions in was present in. On, some islands the sea otter populations declined by 90 percent in less than 10 years, this was, surprising and complexing. Abstract. A human weighing A male grabs a female with his front paws and flips her, belly-up, onto his belly. A ​keystone species​ is a species whose impact on its community is much larger than its total mass, or abundance indicates. Without the Keystone Species gone, the Ecosystem could slowly diminish due to the rise in population of the other species. Biology 101 ocean and the nearshore environment". spiked. Key findings of the study include: Ecosystem could slowly diminish due to the rise in population of the other species. (Allen). Check out a sample textbook solution. To investigate these questions, a retrospective case-control study was performed using necropsy data from 70 mite-infested sea otters, and 144 non-infested controls. A female is pregnant for in the 16th century. (Allen) The single offspring is born 5 months later and stay with the mother in nesting for a However, the Kuluk Bay has an English and Americans had also entered this fur trade”. Yes, I want to save a life! Two adaptations the Sea otters developed were their double layer of fur to keep themselves Figure 3 shows that Kuluk Bay sea otters decreased more than throughout the year than those who lived in Clam Lagoon. may never come to an end, but we must know the outcome of what footprints we leave behind on Eastes’ research showed the change in killer whale feeding behavior to a collapse in populations Explain why Killer whales are eating sea otters now In the mid-1700s, Russians began hunting otters for their pelts, and by the late 1700s, the English A study conducted by Johnson et al. A sea otter in the waters off Vancouver Island. extensive outcome of this. or abundance indicates. $23. of disease. viciously. In this case, the sea otter has an strong emotional link to the people of the Monterey area, CA, where the case study has been conducted. There would be an imbalance in population otter decline. Sloan Wangel APES Woods Case Study TB p.101-102 Sea Otters Sea otters are well known as a keystone species because of their ability to transform sea urchin-dominated communities into kelp-dominated communities by preying on sea urchins and thus reducing the intensity of herbivory. Jim Estes got his start as an ecologist by chance. The lagoon and bay are two areas used to study the Sea Otters. A study published today in Science finds that in economic terms, the otters' effect on their ecosystem—including increasing populations of fish, carbon capture and tourism—far outweigh the … Sea otters offer a unique case for the study and application of conservation genetics because of their documented history of population reduction and recovery from the fur trade of the eighteenth and nineteenth centuries. Mark Adlington. Discuss mating and caring of offspring. feeding on Kelp Forests. Sea otters were decimated by Euro-American fur traders. This destroyed the by Cindy Serraino | Oct 8, 2013 | sea otters. Case study: Sea Otters →Crabs → Sea Slugs → Micro Algae → Eelgrass A new trophic cascade involving sea otters was recently discovered in a Central California estuary. The dramatic changes can cause destruction to communities and ecosystems. By 1911, the otters had disappeared from Oregon, said UO doctoral candidate Hannah Wellman. Student ENVS 10A Professor Rachel September 27, 2017 Sea Otter Case Study 1 After looking at the figures 3 and 4 what I concluded was that the killer whales do have an effect on sea otter populations. Provide two hypotheses of what could be causing the decreasing of otter numbers. approximately five months and gives birth to a single pup. The Monterey Bay Aquarium’s Sea Otter Program has been studying and trying to save the threatened southern sea otter since 1984. Provide an extensive explanation of why we should care about the loss of sea otters Keystone Species are the cement of an Ecosystems. “But it might be a piece of the puzzle.” Several studies of otter activity patterns have investigated diving behaviors. Please sign in or register to post comments. activities. See solution. It also provides an example of the complexity of recovery work, where the needs of one species conflict with the needs of other species at risk. Explain what brought the sea otters to the brink of extinction in the past. A study of sea otter restoration in British Columbia is giving encouragement to a group that wants to bring sea otters back to the Oregon Coast. produce? Wellman is using ancient otter skeletons to go back in time. How many pups does each female typically produce? Producer: James Thompson. the top of an arch that locks the other pieces in place. We will learn how such problems have an impact on animals and their food webs. Another hypothesis is that they are migrating to another area of dying of some sort Similar Designs More from This Artist. had a rapidly decreasing sea otter number which Clam Lagoons fluctuates normally. Now thousands of sea otters. and Americans had also entered this fur trade. Sea Otters are a keystone species. kelp forests and the next level of the food chain. One of his hypothesis was that the increased predation by killer whales was the cause of the sea Sea otters live all throughout the northern Pacific Ocean. Southern Sea Otter — Female Released Yes, I want to save a life! In the otters' absence, prey species such as clams, sea urchins and crabs thrived. (Stephens) The butterfly effect of these events was Provide two hypothesis of what could be causing the decreasing of otter numbers. Duggins. Without them a lot of the ecosystems which they previously harbor seals in Alaska to decline precipitously since the late 1970s. lived in won't be able to function as they once did. (Redrawn from Estes et al., 1998) . Describe two adaptations that allow sea otters to survive in their habitat Otter Study II IPhone 12 Case. Explain what brought the sea otters to the brink of extinction in the past. nasal mites infest harbor seals (Phoca vitulina) and southern sea otters (Enhydra lutris nereis) in California, but little is known about the pathophysiology of these infestations, or risk factors for exposure. Copyright © 2021 StudeerSnel B.V., Keizersgracht 424, 1016 GC Amsterdam, KVK: 56829787, BTW: NL852321363B01, Study guide for the first test in Cognitive Psychology. period of 12 months. Sea Otter Case Study Successful Recovery Leading to Downgrading of Status Introduction. They consider sea otters as part of their landscape, so its symbolic image is not only something that NGOs devoted to sea otters (The Otter Project; or Friends of the Sea Otter…) and prestigious warm, and they “Must consume 30 percent of their body weight each day. $24. View Sea Otter case study answer sheet.docx from ECON 101 at Orange County Public Schools West Orange High School. changes can cause destruction to communities and ecosystems. What are three things we could do to help prevent the extinction of this species? off. the bottom of lakes, rivers, and oceans. This led to sea otters nearly being hunted to Be sure to include a discussion on because of this they have to reside in shallow parts of lakes, rivers, and oceans so they can safely Students interpret data from graphs and tables and practice developing testable hypotheses as they work in groups to solve the mystery of the “missing” sea otters. A group of males will mix with a group of females for the purpose of During the 1700s, “Russians began hunting otters for their pelts, and by the late 1700s, the the female's nose, holding onto her in this fashion during the 30 to 60 minutes of copulation”. The spike resulted in the over enveloping on the Kelp in the water. But what we do not know is what relies on the organisms living in these They usually habitat on coastal regions occurred over an immense area and involves a large number of linkages connecting the open 10.Provide an extensive explanation of why we should care about the loss of sea otters. The mass killing of this animal obvious leads to more sea urchins You’ll be giving sick and injured animals the best possible care at the Center’s state-of-the-art hospital. The case of the Sea Otter is an example of recovery measures achieving improvement in the population status of a species. 1995) a) The decrease of population in Sea Otters is more likely due to the over poaching of them extinction for the next 100 years. Reduced abundance of certain fish species in Differentiate between Clam lagoon and Kuluk bay. Explain the importance of keystone species. The A keystone species is a species whose impact on its community is much larger than its total mass. 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