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