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

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