...Hybridization and “Genetic” Extinction Can and do we preserve the genetic integrity of species, and if so, how? Hybridization • Hybridization: mating between different species or two genetically distinct populations that produces offspring, regardless of fertility of offspring Golden- and Blue-Winged Warblers Golden wingedwarbler Blue wingedwarbler Hybrid (Brewster’s Warbler) Golden- and Blue-Winged Warblers Introgression • Introgression: the incorporation of genes from one population or species to another through hybridization that results in fertile offspring that further hybridize with parental populations or species (“backcross” ) • Over several generations, introgression can result in a complex mixture of parental genes, while in simple hybridization 50% of genes will come from each of the two parental species. • Without introgression, the parental species or populations are not “contaminated” by hybridization Levels of Hybridization Population or Species A Population or Species B F1 Hybrid Backcross (1st generation) Introgression F2 Hybrid (2nd generation) Backcross Hybrid Zones • Hybrid zones are often observed in nature… Species A Species B Hybrid Zone • How are hybrid zones maintained? – Hybrids may be less fit than parental taxa and selected against, but dispersal into the zone maintains a narrow band of F1’s – Hybrids may be more fit than parental taxa in habitats that are intermediate to parental taxas’ native habitat Hybridization and Conservation...
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...James Shin Per 7b/8 Ecology Take Home Test 1) In the given info, there were two groups, an experimental and control group of flowers and sagebrush in a desert landscape that were identical except that the experimental group had a fence enclosed around it. Also, there was a predation relationship between the wildflowers and the kangaroo rats because the kangaroo rats eat wildflowers. Assuming that the fence was limiting the space of the experimental plot, competitive exclusion caused the extinction of the 4 other wild flowers. To begin, there was some interspecific competition, which happens when individuals of different species compete for a resource that limits their survival, between the 5 flower species in the experimental plot because they had their space limited to the fence that they were enclosed in. this competition was a density dependent factor in that the death rate rose when population density in the plot rose. Also, some of the specie’s ecological niches (like what nutrients they needed and how many branches would form) would have had to been the same or else they could coexist together. Then, one of the species of wildflower might have had a reproductive advantage like thorns to repel the kangaroo rats which would have allowed them to prosper and the other species to die out. This is the principle of competitive exclusion. On a tangent, the kangaroo rats would have learned to stay away from the wildflower with thorns by classical conditioning because they...
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...Three little pigs dance in a circle singing "Who's afraid of the big, bad wolf?" Little Red Riding Hood barely escapes the cunning advances of the ravenous wolf disguised as her grandmother. Movie audiences shriek as a gentle young man is transformed before their eyes into a blood-thirsty werewolf, a symbol for centuries of the essence of evil. Such myths and legends have portrayed the wolf as a threat to human existence. Feared as cold-blooded killers, they were hated and persecuted. Wolves were not merely shot and killed; they were tortured as well. In what was believed to be a battle between good and evil, wolves were poisoned, drawn and quartered, doused with gasoline and set on fire, and, in some cases, left with their mouths wired shut to starve (Begley 53). Convinced that they were a problem to be solved, U.S. citizens gradually eradicated gray wolves from the lower 48 states over a period of 25 years. Today many people are convinced that the elimination of the gray wolf was not only an error, but also a detriment to the quality of life in this country. There has been a public outcry to rectify the situation created by the ignorance of our ancestors. However, in seeking to address a situation created by the human compulsion to control nature, it is crucial to discern how much human interference is necessary. Human control must be tempered by respect and restraint. Programs designed for the protection and restoration of wildlife must reflect deference for the...
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...English 101 December 5, 2006 The Big Bad Wolf • Three little pigs dance in a circle singing "Who's afraid of the big, bad wolf?" • Little Red Riding Hood barely escapes the cunning advances of the ravenous wolf disguised as her grandmother. • Movie audiences shriek as a gentle young man is transformed before their eyes into a blood-thirsty werewolf, a symbol for centuries of the essence of evil. Such myths and legends have portrayed the wolf as a threat to human existence. Feared as cold-blooded killers, they were hated and persecuted. Wolves were not merely shot and killed; they were tortured as well. In what was believed to be a battle between good and evil, wolves were poisoned, drawn and quartered, doused with gasoline and set on fire, and, in some cases, left with their mouths wired shut to starve (Begley 53). Convinced that they were a problem to be solved, U.S. citizens gradually eradicated gray wolves from the lower 48 states over a period of 25 years. Today many people are convinced that the elimination of the gray wolf was not only an error, but also a detriment to the quality of life in this country. There has been a public outcry to rectify the situation created by the ignorance of our ancestors. However, in seeking to address a situation created by the human compulsion to control nature, it is crucial to discern how much human interference is necessary. Human control must be tempered by respect and restraint. Programs designed for the protection...
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...Unit 4: Organisms and their environment Ecology:the branch of biology that deals with the relationships between organisms and to their environment. Essentials for survival: All living organisms depend on three thing in their environment. Supply of food Shelter from undesirable physical conditions A breeding site Changing with the seasons: As the seasons change, the ability for the habitat to supply the organism with their requirement may change depending on the time of the year. For example, if the organism does better in the heat and has very little hair to keep it warm, it will do better in the summer rather than in the winter when it's cold. As the organism's requirements deplet they may leave. These will then be followed by the predators who will feed on them. Animals usually migrate due to changing conditions in the animal's environment. For example:...
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...hundreds of years which shaped their relationship with the landscape and nature of the valley (Evergreen 2009). The lower Don River runs through one of the most populated and developed areas in Toronto. Its ravine and waterway has played a significant role in Toronto’s history, attracting housing settlements, industries, and agricultural activities. Don Valley Brick Works’s productive industries thrived in that region due to the river’s abundant resources of water and clay, which compelled paper, brick, and beer manufacturing businesses (Nicholson 1997). Brick Works has flourished for several years as a...
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...The domestic dog (Canis lupus familiaris)[2][3] is a subspecies of the gray wolf (Canis lupus), a member of the Canidae family of the mammalian order Carnivora. The term "domestic dog" is generally used for both domesticated and feral varieties. The dog was the first domesticated animal[4] and has been the most widely kept working, hunting, and pet animal in human history. The word "dog" can also refer to the male of a canine species,[5] as opposed to the word "bitch" which refers to the female of the species. MtDNA evidence shows an evolutionary split between the modern dog's lineage and the modern wolf's lineage around 100,000 years ago but, as of 2013, the oldest fossil specimens genetically linked to the modern dog's lineage date to approximately 33,000–36,000 years ago.[4][6] Dogs' value to early human hunter-gatherers led to them quickly becoming ubiquitous across world cultures. Dogs perform many roles for people, such as hunting, herding, pulling loads, protection, assisting police and military, companionship, and, more recently, aiding handicapped individuals. This impact on human society has given them the nickname "man's best friend" in the Western world. In some cultures, however, dogs are also a source of meat.[7][8] In 2001, there were estimated to be 400 million dogs in the world.[9] Most breeds of dogs are at most a few hundred years old, having been artificially selected for particular morphologies and behaviors by people for specific functional roles. Through...
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...Evidence of False Thumb Evolution Roughly 75% of all the types of mammals that have ever lived are now extinct. We tend to think of extant organisms as all there is. We know dinosaurs once lived and are now extinct. An article explored the routes of diversification taken by early mammals, only those lineages in the far right based on figure 1, in Cenozoic Era have survived to the modern day. Each era group showed how common it was in various time period. The multituberculates were very common until the early Paleocene. In history, they were the dominant group of mammals, existing in the largest numbers for the longest time and are now extinct. Their generations, the spalacotheriods and eutriconodonts, were successful in the Early Creataceous but its population declined by the end of that Period. At the root of the tree showed (figure 1) the groups of mammaliaforms, not true mammals, but have some similarities. This group first appeared in the Jurassic era and didn’t survive the Cretaceous era. The Cretaceous ended with a global extinction that wiped out the non-avian dinosaurs, and several stem-mammals suffered the same fate. Others lingered into the Paleocene Epoch only to become extinct, possibly outcompeted in the rapid radiation of the therians. We tend to think of extinct groups as more “primitive” than extant groups, but the mammals radiated rapidly and many niches occupied today were occupied by now-extinct forms in the past. In the phylogentic tree some show niches available...
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...their large home ranges and conflicts with humans. I examined human-leopard conflicts in and near Ayubia National Park, Pakistan, to provide management recommendations for the conservation of leopards. Persecution of leopards by humans has been on the rise primarily due to depredation on livestock and risk to human lives. Since 1989, 16 humans have either been killed or injured in and around Ayubia National Park while leopards faced 44 human-caused mortalities during the same period. I examined the management strategy adopted by NWFP Wildlife Department for leopard conservation, identify gaps, and suggest possible management actions to mitigate the conflicts. For this purpose, I reviewed the management of carnivores including mountain lions, wolves, and grizzly bears to learn from management successes and failures in North America. Based on my review, I make the following recommendations to improve leopard management in and near Ayubia. First, to minimize human-leopard conflicts, educational and information...
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...Animal Rights Introduction Ethics and morality have consistently been topics of concern in our society. Concerns about ethics and morality also extend to matters associated with the treatment of animals. The purpose of this discussion is to summarize and critique several different theories associated with the ethical treatment of animals. The discussion will focus on the treatment of animals as it relates to hunting and trapping animals, eating animals, using animals for research, and the manner in which domestic and wild animals are treated. The research will summarize and critique several theories including anthropocentrism, Animal liberation, Strong Animal Rights Theory, Weak(er) animal rights theory, Two-factor egalitarianism, biocentric egalitarianism, ecocentric views. Anthropocentrism Anthropocentrism views human being as the center of the universe and regards the world from the point of view of human values and experiences (Dictionary). According to the western philosopher Immanuel Kant human beings alone are rational beings and as such have intrinsic moral worth. Kant asserts that human beings do not owe animals anything because they are not rational beings. However, he does assert that people should be kind to animals but only because kindness to animals assists in developing character in human beings. In other words kindness to animals should not take place for the sake of the animal but for the betterment of the human being. In addition to Kant...
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...your working. Answer:............................ (2) (b) Isle Royale is a large island in Lake Superior. Moose first colonised this island in 1900. At the time they had no predators on the island. Wolves, which are predators of moose, were introduced to the island in 1950. The graph shows the moose population from 1900. (i) Suggest an explanation for the changes in the moose population before the introduction of the wolves. ........................................................................................................................... ........................................................................................................................... ........................................................................................................................... ........................................................................................................................... (2) (ii) Describe the effect of introducing wolves on the moose population. ........................................................................................................................... ...................................................................................................................
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...Practice Test #1 Sentence Correction 1. To meet the rapidly rising market demand for fish and seafood, suppliers are growing fish twice as fast as they grow naturally, cutting their feed allotment by nearly half and raising them on special diets. 2. Organized in 1966 by the Fish and Wildlife Service, the Breeding Bird Survey uses annual roadside counts along established routes to monitor changes in the populations of more than 250 bird species, including 180 songbirds. 3. Less than 35 years after the release of African honeybees outside Sao Paulo, Brazil, their descendants, popularly known as killer bees, had migrated as far north as southern Texas. 4. Excited about the prospects of harnessing Niagara Falls to produce electric power, Nikola Tesla, the inventor of alternating current, predicted in the mid-1890's that electricity generated at Niagara would one day power the streetcars of London and the streetlights of Paris. 5. The airline company, following through on recent warnings that it might start reducing service, announced that it was eliminating jet service to nine cities, closing some unneeded operations, and grounding twenty-two planes. 6. The list of animals that exhibit a preference for using either the right or the left hand (i.e., claw, paw, or foot) has been expanded to include the lower vertebrates. 7. Obtaining an investment-grade rating will keep the county's future borrowing costs low, protect its already-tattered...
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...VOLUME EDITOR S. WALLER is an Associate Professor of Philosophy at Montana State University Bozeman. Her areas of research are philosophy of neurology, philosophy of cognitive ethology (especially dolphins, wolves, and coyotes), and philosophy of mind, specifically the parts of the mind we disavow. SERIES EDITOR FRITZ ALLHOFF is an Assistant Professor in the Philosophy Department at Western Michigan University, as well as a Senior Research Fellow at the Australian National University’s Centre for Applied Philosophy and Public Ethics. In addition to editing the Philosophy for Everyone series, Allhoff is the volume editor or co-editor for several titles, including Wine & Philosophy (Wiley-Blackwell, 2007), Whiskey & Philosophy (with Marcus P. Adams, Wiley, 2009), and Food & Philosophy (with Dave Monroe,Wiley-Blackwell, 2007). P H I L O S O P H Y F O R E V E RYO N E Series editor: Fritz Allhoff Not so much a subject matter, philosophy is a way of thinking.Thinking not just about the Big Questions, but about little ones too.This series invites everyone to ponder things they care about, big or small, significant, serious … or just curious. Running & Philosophy: A Marathon for the Mind Edited by Michael W. Austin Wine & Philosophy: A Symposium on Thinking and Drinking Edited by Fritz Allhoff Food & Philosophy: Eat,Think and Be Merry Edited by Fritz Allhoff and Dave Monroe Beer & Philosophy: The Unexamined Beer Isn’t Worth Drinking Edited by Steven D. Hales Whiskey & Philosophy:...
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...Chap1 Comparing Apples and Oranges The concept of “apples and oranges” relates to the consistency of anything that is compared with something else. Whenever you make a comparison in sentence, you have to make sure the things you compare are , in fact, comparable. Than ①主语比较 1. Because the Earth’s crust is more solid there and thus better able to transmit shock waves, an earthquake in the eastern United States will typically devastate an area 100 times greater than will a quake of comparable magnitude occurring in the West.(D-P35-9) 2.Local residents claim that San Antonio, Texas, has more good Mexican American restaurants than does any other city in the United States. (D-p78-14) 3.The guiding principles of the tax plan released by the Treasury Department could have even greater significance for the economy than do the particulars of the plan. (C-p8-6) 4. Because natural gas is composed mostly of methane, a simple hydrocarbon, vehicles powered by natural gas emit less of certain pollutants than those burning gasoline or diesel fuel. (C-p8-16) 5. The United States government employs a much larger proportion of women in trade negotiations than does any other government. (C-p22-8) 6. The pay of senior executives increased in 1990 by a larger percentage than did the wages of other salaried workers. (C-p67-5) 7. A newly developed jumbo rocket, which is expected to carry the United States into its next phase of space exploration, will be able to deliver a heavier load...
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...Sentence Correction Questions 1. 1 A “calendar stick” carved centuries ago by the Winnebago tribe may provide the first evidence that the North American Indians have developed advanced full-year calendars basing them on systematic astronomical observation. (A) that the North American Indians have developed advanced full-year calendars basing them (B) of the North American Indians who have developed advanced full-year calendars and based them (C) of the development of advanced full-year calendars by North American Indians, basing them (D) of the North American Indians and their development of advanced full-year calendars based (E) that the North American Indians developed advanced full-year calendars based 2. A 1972 agreement between Canada and the United States reduced the amount of phosphates that municipalities had been allowed to dump into the Great Lakes. (A) reduced the amount of phosphates that municipalities had been allowed to dump (B) reduced the phosphate amount that municipalities had been dumping (C) reduces the phosphate amount municipalities have been allowed to dump (D) reduced the amount of phosphates that municipalities are allowed to dump (E) reduces the amount of phosphates allowed for dumping by municipalities 3. A collection of 38 poems by Phillis Wheatley, a slave, was published in the 1770’s, the first book by a Black woman and it was only the second published by an American woman. (A) it was only the second published by an American woman...
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