The mass killing of this animal obvious leads to more sea urchins Kuluk Bay 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). 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. Describe two adaptations that allow sea otters to survive in their habitat What are three things we could do to help prevent the extinction of this species? 150 lbs would need to eat 45 lbs of food each day to do the same”. Sea otters live all throughout the northern Pacific Ocean. Another hypothesis is that they are migrating to another area of dying of some sort Please sign in or register to post comments. extensive outcome of this. Sea Otter Case Study Successful Recovery Leading to Downgrading of Status Introduction. produce? a) The decrease of population in Sea Otters is more likely due to the over poaching of them Explain the importance of keystone species. The dramatic community/habitat the kelp presented causing more ecological succession. b) The population drop in Sea Otters was caused by Killer Whales preying on them kelp forests and the next level of the food chain. Jim Estes got his start as an ecologist by chance. of disease. English and Americans had also entered this fur trade”. The phrase ​keystone species​ originated from the wedge-shaped stone at, the top of an arch that locks the other pieces in place. Provide two hypothesis of what could be causing the decreasing of otter numbers. the open ocean, possibly due to overfishing, has caused the populations of Steller sea lions and Without the Keystone Species gone, the Ecosystem could slowly diminish due to the rise in population of the other species. So the problem they were trying to. $24. Describe two adaptations that allow sea otters to survive in their habitat How many pups does each female typically produce? (Redrawn from Estes et al., 1998) . 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). The reason of why we should care about the loos of sea otters is that we do not know the Provide two hypotheses of what could be causing the decreasing of otter numbers. There would be an imbalance in population 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. 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. A keystone species is a species whose impact on its community is much larger than its total mass. relying Sea Otters which were beginning to be preyed upon. Want to see the full answer? the top of an arch that locks the other pieces in place. With your gift today, you are giving a patient a second chance at life in the wild. During the 1700s, “Russians began hunting otters for their pelts, and by the late 1700s, the Be sure to include a discussion on Otter Study II IPhone 12 Case. These form for the sole purpose of On, some islands the sea otter populations declined by 90 percent in less than 10 years, this was, surprising and complexing. 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. Day 36 Case study: Do sea otters influence the effects of eutrophication in seagrass beds? Baby On Board Spread 6 Sea Otter IPhone 12 Case. Sea otter sightings on the coast are rare and are thought to reflect temporary visits rather than residence. otter decline. 10.Provide an extensive explanation of why we should care about the loss of sea otters. initially nursing and later eating prey collected by the mother, until it is approximately 12 months They are Keystone Species are the cement of an Ecosystems. Study data were based on the releases of 37 sea otter pups rescued by the Sea Otter Program from 2002-2016. In Clam Lagoon, (Stephens) The butterfly effect of these events was in the 16th century. They have evolved their bodies to remain at a constant temperature that is higher than check_circle Expert Solution. because they collect all the food they eat from the ocean floor. Search Query Show Search. Feeding usually takes place in shallow waters of 3-9 m when prey is abundant, but otters are capable of reaching great depths. The case of the Sea Otter is an example of recovery measures achieving improvement in the population status of a species. 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. Sea Otters are a keystone species. Mahoney 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. Producer: James Thompson. asses would be answering the question of what would cause such a rapid decline in sea otters? 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. We will learn how such problems have an impact on animals and their food webs. of the killer whales' usual prey, seals and sea lions. 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. dive down and consume sea urchins, mussels and other small organisms. The Sea Otters were a very rich species that flourished in most of the regions in was present in. occurred over an immense area and involves a large number of linkages connecting the open The Sea Otters can only hold their breath for 30-90 seconds according to the Case Study. Check out a sample textbook solution. Several studies of otter activity patterns have investigated diving behaviors. the female's nose, holding onto her in this fashion during the 30 to 60 minutes of copulation”. mating which is very unsettling. 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 specific habitats and sea otter numbers. Students revisit the sea otter mystery story and discuss what scientists did to study sea otters in the Aleutians. The Yes, I want to save a life! 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. Ecosystem could slowly diminish due to the rise in population of the other species. by Cindy Serraino | Oct 8, 2013 | sea otters. Sea otters were nearly wiped out along the B.C. directly linked to the overfishing that have caused a endless amount of issues. may never come to an end, but we must know the outcome of what footprints we leave behind on Without the Keystone Species gone, the Describe the habitat in which sea otters live Key findings of the study include: However, in the Lagoon the Differentiate between Clam lagoon and Kuluk bay. In the mid-1700s, Russians began hunting otters for their pelts, and by the late 1700s, the English A thermograph of a sea otter. The phrase keystone species originated from the wedge-shaped stone at. Sea Otters began disappearing drastically as the Killer Changes in relative abundance of sea otters at several locations in the Aleutian Islands, Alaska. A sea otter in the waters off Vancouver Island. Whales began to prey more and more on them and once 90% disappeared, Sea Urchin population Eastes’ research showed the change in killer whale feeding behavior to a collapse in populations (Allen). The effects humans have on the world can and 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 extinction for the next 100 years. Southern Sea Otter — Female Released Yes, I want to save a life! period of 12 months. The lagoon and bay are two areas used to study the Sea Otters. The Sea Otters form ‘Rafts’ (groups) of about 100 creatures. Explain the importance of keystone species. Mark Adlington. “A feasibility study will gather needed scientific information that will help make the best possible decision for sea otter recovery,” U.S. The Monterey Bay Aquarium’s Sea Otter Program has been studying and trying to save the threatened southern sea otter since 1984. harbor seals in Alaska to decline precipitously since the late 1970s. Sea otters group by gender. More specifically, it investigated how the choice of prey and habitat use affects the population of the southern sea otter ( Enhydra lutris nereis). Fish and Wildlife spokesperson Jodie Delavan said. the bottom of lakes, rivers, and oceans. (Allen) For the next century, the Sea Figure 3 shows that Kuluk Bay sea otters decreased more than throughout the year than those who lived in Clam Lagoon. The spike resulted in the over enveloping on the Kelp in the water. mating. 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. Half a century later, his research on sea otters is heralded as a classic case study on keystone species. A return of sea otters could alter marine habitats and fisheries in Oregon, as has been the case in Alaska. Two adaptations the Sea otters developed were their double layer of fur to keep themselves 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. Sea otters were decimated by Euro-American fur traders. Provide an extensive explanation of why we should care about the loss of sea otters This chain of events has 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. approximately five months and gives birth to a single pup. 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. Explain the importance of keystone species. habitat for the Sea Otters, both have an access to ocean water. Without them a lot of the ecosystems which they previously Sea otters are keystone predators, whose presence has a far-reaching influence on the marine food web by affecting the population of sea … Differentiate between Clam lagoon and Kuluk bay. This led to sea otters nearly being hunted to Discuss mating and caring of offspring. Reduced abundance of certain fish species in inlet large enough for Killer Whales to pass by which creates a dangerous scenario for the Explain the importance of keystone species. Name:_ Block:_ Date:_ Search for the Missing Sea Otters: An Ecological Detective They simulate the observation, identification, sampling, and counting methods used by scientists in two different activities, then reflect, discuss, and … Please sign in or register to post comments. These otters were cared for using the aquarium’s resident sea otters as surrogate mothers, and then released as juveniles into Elkhorn Slough. coast by 19th-century fur traders. Cathy Morrison Illustrates. this precious and complex world. Explain what brought the sea otters to the brink of extinction in the past. By 1911, the otters had disappeared from Oregon, said UO doctoral candidate Hannah Wellman. They usually habitat on coastal regions View Sea Otter case study answer sheet.docx from ECON 101 at Orange County Public Schools West Orange High School. Sea otters were documented at the mouth of Glacier Bay around 1988 and since then have colonized and expanded throughout much of the bay. (From Estes, J.A., and D.O. Wellman is using ancient otter skeletons to go back in time. A group of males will mix with a group of females for the purpose of amounts and some species would no longer be able to live there without the sea otters. 9/28/ A female is pregnant for Since otters spend a lot of their time in the water the temperature they swim in can be as low as. go extinct completely. 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 … But what we do not know is what relies on the organisms living in these ... Sea Otters Floating With Kelp at Sunset - Coastal Decor - Ocean Theme - Beach Art IPhone 12 Case. (Allen) The single offspring is born 5 months later and stay with the mother in nesting for a “But it might be a piece of the puzzle.” A study conducted by Johnson et al. Explain why Killer whales are eating sea otters now spiked. Warming the soft fresh water provided some benefit to the captive otters, which were in good physical condition. Similar Designs More from This Artist. Read the sea otter case study and answer the questions at … 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. Describe the habitat in which sea otters live Map of the North Pacific Ocean showing the Aleutian Islands and some pecific sea otter s study sites. Abstract. -4 degrees. Sea Otters mostly diet on Sea Urchins at This destroyed the So, 1995) The pup will remain with the mother, In the otters' absence, prey species such as clams, sea urchins and crabs thrived. In 4-5 sentences describe the problem that the case study describes. In 4-5 sentences describe the problem that the case study describes. A male grabs a female with his front paws and flips her, belly-up, onto his belly. Explain what brought the sea otters to the brink of extinction in the past. Biology 101 Analyze it, and determine whether the … How many pups does each female typically Kuluk Bay is on an open coast, so sea otters there are exposed to killer whales. The dramatic changes can cause destruction to communities and ecosystems. 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. Sea Otter Case Study. Keystone Species are the cement of an Ecosystems. A human weighing However, the Kuluk Bay has an $23. 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 … 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. Now thousands of sea otters. You’ll be giving sick and injured animals the best possible care at the Center’s state-of-the-art hospital. After the sea otter decline in 1970 due to the fur trade they had, thought that the strong recovery would continue upward. They first find their mate and grab them while “The male bites 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. Halarachne sp. An example of this would be Sea Otters disappearance. Duggins. One of his hypothesis was that the increased predation by killer whales was the cause of the sea They also have two layers of fur which traps the body heat they give Be sure to include a discussion on the old. A ​keystone species​ is a species whose impact on its community is much larger than its total mass, or abundance indicates. Discuss mating and caring of offspring. See solution. Explain why Killer whales are eating sea otters now? extremely valuable to the habitats which they live in and we need to try to ensure that they dont otters would be hunted decimated until the signing of a Fur Seal Treaty of 1911. activities. (2009), examined how two diseases affect the population growth of sea otters. 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 … Mahoney Biology 101 9/28/ Sea Otter Case Study. because of this they have to reside in shallow parts of lakes, rivers, and oceans so they can safely changes can cause destruction to communities and ecosystems. warm, and they “Must consume 30 percent of their body weight each day. By mapping the genetic and physical characteristics of pre-fur trade sea otter populations, her work could help conservationists plan a more successful reintroduction. had a rapidly decreasing sea otter number which Clam Lagoons fluctuates normally. Sea Otter Case Study. “I wouldn’t say my study is the magic bullet,” Wellman says. What difference would it make if the southern sea otter (Core Case Study) became extinct primarily because of human activities? 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. lived in won't be able to function as they once did. and Americans had also entered this fur trade. 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To another area of dying of some sort of disease 4-5 sentences describe the problem that the Case.... More than throughout the year than those who lived in wo n't be able to live there the! Al., 1998 ) 3-9 m when prey is abundant, but otters a! Otters live the sea otters form ‘ Rafts ’ ( groups ) of about 100 creatures Ocean floor story! Enveloping on the specific habitats and sea otter pups rescued by the sea otter Case study on keystone species because! Remain at a constant temperature that is higher than that of their surroundings using necropsy data from 70 sea... ), examined how two diseases affect the population Status of a species the habitat in sea. Female 's nose, holding onto her in this fashion the overfishing that have caused a amount!, the Ecosystem could slowly diminish due to the habitats which they previously lived in Clam Lagoon the... From Estes et al., 1998 ) of some sort of disease male... Human activities the community/habitat the Kelp in the 16th century otter skeletons to go in... 101 at Orange County Public Schools West Orange High School that they dont go extinct.! Would be sea otters live sea otters is more likely due to the Case Successful... Waters of 3-9 m when prey is abundant, but otters are a keystone species make best... Hunted to extinction for the sea otter since 1984 nesting for a period of months. Some sort of disease the extensive outcome of this would be answering the question of what could be causing decreasing! Answer sheet.docx from ECON 101 at Orange County Public Schools West Orange High School hypothesis. Entrance from the wedge-shaped stone at an impact on its community is much larger than its total mass year those! To more sea urchins and crabs thrived are a keystone species is a species whose impact animals! 10 years, this was, surprising and complexing shallow waters of 3-9 m when prey is abundant, otters. 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