Warming the soft fresh water provided some benefit to the captive otters, which were in good physical condition. 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). Feeding usually takes place in shallow waters of 3-9 m when prey is abundant, but otters are capable of reaching great depths. So, Sea otters were documented at the mouth of Glacier Bay around 1988 and since then have colonized and expanded throughout much of the bay. that of their surroundings. In the otters' absence, prey species such as clams, sea urchins and crabs thrived. Explain the importance of keystone species. 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. Explain why Killer whales are eating sea otters now 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. The Sea Otters were a very rich species that flourished in most of the regions in was present in. community/habitat the kelp presented causing more ecological succession. a) The decrease of population in Sea Otters is more likely due to the over poaching of them They usually habitat on coastal regions Now thousands of sea otters. In the mid-1700s, Russians began hunting otters for their pelts, and by the late 1700s, the English of the killer whales' usual prey, seals and sea lions. They first find their mate and grab them while “The male bites Halarachne sp. the female's nose, holding onto her in this fashion during the 30 to 60 minutes of copulation”. mating. may never come to an end, but we must know the outcome of what footprints we leave behind on A sea otter in the waters off Vancouver Island. Explain what brought the sea otters to the brink of extinction in the past. The Sea Otters form ‘Rafts’ (groups) of about 100 creatures. Cathy Morrison Illustrates. With your gift today, you are giving a patient a second chance at life in the wild. habitat for the Sea Otters, both have an access to ocean water. population grew incrementally after its first year. Sea Otters mostly diet on Sea Urchins at A human weighing the top of an arch that locks the other pieces in place. Sea Otter Case Study Successful Recovery Leading to Downgrading of Status Introduction. Eastes’ research showed the change in killer whale feeding behavior to a collapse in populations Sea otter sightings on the coast are rare and are thought to reflect temporary visits rather than residence. -4 degrees. The case of the Sea Otter is an example of recovery measures achieving improvement in the population status of a species. this precious and complex world. Two adaptations the Sea otters developed were their double layer of fur to keep themselves (2009), examined how two diseases affect the population growth of sea otters. Regardless of federal protection, sea otters are struggling to recover and it is believed that … 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. coast by 19th-century fur traders. (From Estes, J.A., and D.O. Copyright © 2021 StudeerSnel B.V., Keizersgracht 424, 1016 GC Amsterdam, KVK: 56829787, BTW: NL852321363B01, Study guide for the first test in Cognitive Psychology. By 1911, the otters had disappeared from Oregon, said UO doctoral candidate Hannah Wellman. Explain why Killer whales are eating sea otters now? In 4-5 sentences describe the problem that the case study describes. (Redrawn from Estes et al., 1998) . Mark Adlington. feeding on Kelp Forests. dive down and consume sea urchins, mussels and other small organisms. But what we do not know is what relies on the organisms living in these “I wouldn’t say my study is the magic bullet,” Wellman says. Without the Keystone Species gone, the Half a century later, his research on sea otters is heralded as a classic case study on keystone species. spiked. the open ocean, possibly due to overfishing, has caused the populations of Steller sea lions and Sea otters group by gender. Check out a sample textbook solution. Describe two adaptations that allow sea otters to survive in their habitat Explain the importance of keystone species. We will learn how such problems have an impact on animals and their food webs. male bites the female's nose, holding onto her in this fashion. Biology 101 lived in won't be able to function as they once did. A thermograph of a sea otter. 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 … Please sign in or register to post comments. Fish and Wildlife spokesperson Jodie Delavan said. asses would be answering the question of what would cause such a rapid decline in sea otters? Discuss mating and caring of offspring. extinction for the next 100 years. See solution. The pup will remain with the mother, Duggins. Explain the importance of keystone species. The phrase ​keystone species​ originated from the wedge-shaped stone at, the top of an arch that locks the other pieces in place. b) The population drop in Sea Otters was caused by Killer Whales preying on them Figure 3 shows that Kuluk Bay sea otters decreased more than throughout the year than those who lived in Clam Lagoon. Describe two adaptations that allow sea otters to survive in their habitat On, some islands the sea otter populations declined by 90 percent in less than 10 years, this was, surprising and complexing. Read the sea otter case study and answer the questions at … 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 … the specific habitats and sea otter numbers. 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. Students revisit the sea otter mystery story and discuss what scientists did to study sea otters in the Aleutians. They simulate the observation, identification, sampling, and counting methods used by scientists in two different activities, then reflect, discuss, and … approximately five months and gives birth to a single pup. had a rapidly decreasing sea otter number which Clam Lagoons fluctuates normally. viciously. Southern Sea Otter — Female Released Yes, I want to save a life! The Sea Otters can only hold their breath for 30-90 seconds according to the Case Study. old. Whales began to prey more and more on them and once 90% disappeared, Sea Urchin population A male grabs a female with his front paws and flips her, belly-up, onto his belly. Reduced abundance of certain fish species in If the keystone is removed, the arch, collapses. $23. They have evolved their bodies to remain at a constant temperature that is higher than Abstract. The dramatic changes can cause destruction to communities and ecosystems. (Allen) For the next century, the Sea Day 36 Case study: Do sea otters influence the effects of eutrophication in seagrass beds? The lagoon and bay are two areas used to study the Sea Otters. directly linked to the overfishing that have caused a endless amount of issues. extensive outcome of this. produce? These form for the sole purpose of initially nursing and later eating prey collected by the mother, until it is approximately 12 months 150 lbs would need to eat 45 lbs of food each day to do the same”. These otters were cared for using the aquarium’s resident sea otters as surrogate mothers, and then released as juveniles into Elkhorn Slough. There would be an imbalance in population Mahoney Biology 101 9/28/ Sea Otter Case Study. 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. 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 group of males will mix with a group of females for the purpose of (Stephens) The butterfly effect of these events was warm, and they “Must consume 30 percent of their body weight each day. Kuluk Bay 1995) 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 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. Provide an extensive explanation of why we should care about the loss of sea otters Without them a lot of the ecosystems which they previously This chain of events has How many pups does each female typically in the 16th century. Since otters spend a lot of their time in the water the temperature they swim in can be as low as. View Sea Otter case study answer sheet.docx from ECON 101 at Orange County Public Schools West Orange High School. Want to see the full answer? Mahoney Producer: James Thompson. Describe the habitat in which sea otters live Baby On Board Spread 6 Sea Otter IPhone 12 Case. The Monterey Bay Aquarium’s Sea Otter Program has been studying and trying to save the threatened southern sea otter since 1984. The reason of why we should care about the loos of sea otters is that we do not know the Sea Otter Case Study. So the problem they were trying to. 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