The Sea Otters were a very rich species that flourished in most of the regions in was present in. Without them a lot of the ecosystems which they previously 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. amounts and some species would no longer be able to live there without the sea otters. Half a century later, his research on sea otters is heralded as a classic case study on keystone species. In 4-5 sentences describe the problem that the case study describes. Describe the habitat in which sea otters live In the otters' absence, prey species such as clams, sea urchins and crabs thrived. of disease. 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. Provide two hypotheses of what could be causing the decreasing of otter numbers. or abundance indicates. warm, and they “Must consume 30 percent of their body weight each day. relying Sea Otters which were beginning to be preyed upon. dive down and consume sea urchins, mussels and other small organisms. Describe two adaptations that allow sea otters to survive in their habitat In 4-5 sentences describe the problem that the case study describes. A human weighing Mahoney Biology 101 9/28/ Sea Otter Case Study. Figure 3 shows that Kuluk Bay sea otters decreased more than throughout the year than those who lived in Clam Lagoon. Kuluk Bay (Allen) For the next century, the Sea coast by 19th-century fur traders. Wellman is using ancient otter skeletons to go back in time. Please sign in or register to post comments. Reduced abundance of certain fish species in In Clam Lagoon, because of this they have to reside in shallow parts of lakes, rivers, and oceans so they can safely had a rapidly decreasing sea otter number which Clam Lagoons fluctuates normally. The Monterey Bay Aquarium’s Sea Otter Program has been studying and trying to save the threatened southern sea otter since 1984. 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. Explain what brought the sea otters to the brink of extinction in the past. Sea Otter Case Study Successful Recovery Leading to Downgrading of Status Introduction. They both contain a similar $24. Sea Otter Case Study. Be sure to include a discussion on A return of sea otters could alter marine habitats and fisheries in Oregon, as has been the case in Alaska. Sea Otters are a keystone species. Explain the importance of keystone species. Name:_ Block:_ Date:_ Search for the Missing Sea Otters: An Ecological Detective The Sea Otters can only hold their breath for 30-90 seconds according to the Case Study. A study conducted by Johnson et al. “I wouldn’t say my study is the magic bullet,” Wellman says. Another hypothesis is that they are migrating to another area of dying of some sort extensive outcome of this. They usually habitat on coastal regions extinction for the next 100 years. Since otters spend a lot of their time in the water the temperature they swim in can be as low as. Map of the North Pacific Ocean showing the Aleutian Islands and some pecific sea otter s study sites. This chain of events has 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. Sea Otters mostly diet on Sea Urchins at Key findings of the study include: A ​keystone species​ is a species whose impact on its community is much larger than its total mass, or abundance indicates. male bites the female's nose, holding onto her in this fashion. Day 36 Case study: Do sea otters influence the effects of eutrophication in seagrass beds? this precious and complex world. period of 12 months. Explain why Killer whales are eating sea otters now There would be an imbalance in population may never come to an end, but we must know the outcome of what footprints we leave behind on Analyze it, and determine whether the … A group of males will mix with a group of females for the purpose of feeding on Kelp Forests. Mark Adlington. Describe two adaptations that allow sea otters to survive in their habitat Explain why Killer whales are eating sea otters now? Sea otters were nearly wiped out along the B.C. Southern Sea Otter — Female Released Yes, I want to save a life! go extinct completely. The Sea Otters form ‘Rafts’ (groups) of about 100 creatures. Warming the soft fresh water provided some benefit to the captive otters, which were in good physical condition. Without the Keystone Species gone, the Ecosystem could slowly diminish due to the rise in population of the other species. These otters were cared for using the aquarium’s resident sea otters as surrogate mothers, and then released as juveniles into Elkhorn Slough. 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. Now thousands of sea otters. directly linked to the overfishing that have caused a endless amount of issues. 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 Read the sea otter case study and answer the questions at … “A feasibility study will gather needed scientific information that will help make the best possible decision for sea otter recovery,” U.S. (Allen). (Allen) The single offspring is born 5 months later and stay with the mother in nesting for a They also have two layers of fur which traps the body heat they give This led to sea otters nearly being hunted to Two adaptations the Sea otters developed were their double layer of fur to keep themselves 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. and Americans had also entered this fur trade. The reason of why we should care about the loos of sea otters is that we do not know the Eastes’ research showed the change in killer whale feeding behavior to a collapse in populations spiked. Describe the habitat in which sea otters live -4 degrees. 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). Ecosystem could slowly diminish due to the rise in population of the other species. The phrase ​keystone species​ originated from the wedge-shaped stone at, the top of an arch that locks the other pieces in place. lived in won't be able to function as they once did. Sea Otters began disappearing drastically as the Killer inlet large enough for Killer Whales to pass by which creates a dangerous scenario for 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. However, the Kuluk Bay has an 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. If the keystone is removed, the arch, collapses. Provide two hypothesis of what could be causing the decreasing of otter numbers. (Redrawn from Estes et al., 1998) . Mahoney Abstract. 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 … Explain the importance of keystone species. Want to see the full answer? 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. How many pups does each female typically produce? But what we do not know is what relies on the organisms living in these Otter Study II IPhone 12 Case. the open ocean, possibly due to overfishing, has caused the populations of Steller sea lions and 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. approximately five months and gives birth to a single pup. 150 lbs would need to eat 45 lbs of food each day to do the same”. $23. However, in the Lagoon the Copyright © 2021 StudeerSnel B.V., Keizersgracht 424, 1016 GC Amsterdam, KVK: 56829787, BTW: NL852321363B01, Study guide for the first test in Cognitive Psychology. This destroyed the Keystone Species are the cement of an Ecosystems. Kuluk Bay is on an open coast, so sea otters there are exposed to killer whales. The lagoon and bay are two areas used to study the Sea Otters. Yes, I want to save a life! Provide an extensive explanation of why we should care about the loss of sea otters They first find their mate and grab them while “The male bites Whales began to prey more and more on them and once 90% disappeared, Sea Urchin population 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. The mass killing of this animal obvious leads to more sea urchins Keystone Species are the cement of an Ecosystems. Cathy Morrison Illustrates. harbor seals in Alaska to decline precipitously since the late 1970s. in the 16th century. They have evolved their bodies to remain at a constant temperature that is higher than One of his hypothesis was that the increased predation by killer whales was the cause of the sea 10.Provide an extensive explanation of why we should care about the loss of sea otters. We will learn how such problems have an impact on animals and their food webs. Search Query Show Search. Students revisit the sea otter mystery story and discuss what scientists did to study sea otters in the Aleutians. otters would be hunted decimated until the signing of a Fur Seal Treaty of 1911. old. Discuss mating and caring of offspring. produce? Regardless of federal protection, sea otters are struggling to recover and it is believed that … Differentiate between Clam lagoon and Kuluk bay. ... Sea Otters Floating With Kelp at Sunset - Coastal Decor - Ocean Theme - Beach Art IPhone 12 Case. The dramatic changes can cause destruction to communities and ecosystems. A sea otter in the waters off Vancouver Island. occurred over an immense area and involves a large number of linkages connecting the open What are three things we could do to help prevent the extinction of this species? Baby On Board Spread 6 Sea Otter IPhone 12 Case. (2009), examined how two diseases affect the population growth of sea otters. Duggins. (Stephens) The butterfly effect of these events was During the 1700s, “Russians began hunting otters for their pelts, and by the late 1700s, the Study data were based on the releases of 37 sea otter pups rescued by the Sea Otter Program from 2002-2016. Sea otters are keystone predators, whose presence has a far-reaching influence on the marine food web by affecting the population of sea … 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. How many pups does each female typically extremely valuable to the habitats which they live in and we need to try to ensure that they dont asses would be answering the question of what would cause such a rapid decline in sea otters? English and Americans had also entered this fur trade”. Similar Designs More from This Artist. by Cindy Serraino | Oct 8, 2013 | sea otters. 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). 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. Be sure to include a discussion on the 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. A thermograph of a sea otter. Producer: James Thompson. specific habitats and sea otter numbers. Changes in relative abundance of sea otters at several locations in the Aleutian Islands, Alaska. habitat for the Sea Otters, both have an access to ocean water. b) The population drop in Sea Otters was caused by Killer Whales preying on them that of their surroundings. 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. After the sea otter decline in 1970 due to the fur trade they had, thought that the strong recovery would continue upward. Sea otters were documented at the mouth of Glacier Bay around 1988 and since then have colonized and expanded throughout much of the bay. Explain the importance of keystone species. The spike resulted in the over enveloping on the Kelp in the water. 1995) The mating which is very unsettling. mating. The case of the Sea Otter is an example of recovery measures achieving improvement in the population status of a species. Feeding usually takes place in shallow waters of 3-9 m when prey is abundant, but otters are capable of reaching great depths. Halarachne sp. Sea otter sightings on the coast are rare and are thought to reflect temporary visits rather than residence. A male grabs a female with his front paws and flips her, belly-up, onto his belly. On, some islands the sea otter populations declined by 90 percent in less than 10 years, this was, surprising and complexing. The phrase keystone species originated from the wedge-shaped stone at. kelp forests and the next level of the food chain. An example of this would be Sea Otters disappearance. (From Estes, J.A., and D.O. These form for the sole purpose of ocean and the nearshore environment". So the problem they were trying to. 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. of the killer whales' usual prey, seals and sea lions. With your gift today, you are giving a patient a second chance at life in the wild. Differentiate between Clam lagoon and Kuluk bay. Please sign in or register to post comments. Explain what brought the sea otters to the brink of extinction in the past. 9/28/ The dramatic 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 keystone species is a species whose impact on its community is much larger than its total mass. Biology 101 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. because they collect all the food they eat from the ocean floor. 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. a) The decrease of population in Sea Otters is more likely due to the over poaching of them What difference would it make if the southern sea otter (Core Case Study) became extinct primarily because of human activities? off. 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. Sea otters were decimated by Euro-American fur traders. 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 … Explain the importance of keystone species. initially nursing and later eating prey collected by the mother, until it is approximately 12 months There was most likely a decline in the populations of the killer whales usual prey. viciously. activities. Several studies of otter activity patterns have investigated diving behaviors. By mapping the genetic and physical characteristics of pre-fur trade sea otter populations, her work could help conservationists plan a more successful reintroduction. Without the Keystone Species gone, the check_circle Expert Solution. So, They are otter decline. The pup will remain with the mother, View Sea Otter case study answer sheet.docx from ECON 101 at Orange County Public Schools West Orange High School. In the mid-1700s, Russians began hunting otters for their pelts, and by the late 1700s, the English community/habitat the kelp presented causing more ecological succession. The effects humans have on the world can and Sea otters group by gender. the entrance from the open sea is too narrow and shallow for killer whales to get in. Sea otters live all throughout the northern Pacific Ocean. population grew incrementally after its first year. You’ll be giving sick and injured animals the best possible care at the Center’s state-of-the-art hospital. the female's nose, holding onto her in this fashion during the 30 to 60 minutes of copulation”. the top of an arch that locks the other pieces in place. Discuss mating and caring of offspring. Check out a sample textbook solution. Jim Estes got his start as an ecologist by chance. By 1911, the otters had disappeared from Oregon, said UO doctoral candidate Hannah Wellman. A female is pregnant for “But it might be a piece of the puzzle.” They simulate the observation, identification, sampling, and counting methods used by scientists in two different activities, then reflect, discuss, and … the specific habitats and sea otter numbers. See solution. the bottom of lakes, rivers, and oceans. changes can cause destruction to communities and ecosystems.
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