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