And to reflect on what it means to lose diversity, because we are currently losing diversity very rapidly. The moment of extinction is generally considered to be the death of the. Macroevolutionary patterns of flowering plant speciation and. Williams from uwmadison suggests that changes in regions such as the peruvian andes, portions of the himalayas and southern australia could have a profound impact on indigenous plants and animals williams and his research partners used computer models to estimate how various parts of the.
It explains the means of speciation, both premating and post mating barriers,and also informs of what happens when a species goes extinct. Evolution of a new species that occurs due to changes in gene flow in populations of the ancestral species. The resulting rearrangment of genetic material leads to new species and the extinction of the older species, and this is why mass extinctions are followed by mass speciations. This content was copied from view the original, and get the alreadycompleted solution here. This speciation and extinction video is suitable for 9th 12th grade.
I want to reflect on biodiversity, the complex spatiotemporal variation in this thing we call life, and the roles of speciation and extinction in determining how much biodiversity is around us. Reproductive isolating mechanisms reproductive isolating mechanisms reproductive isolating mechanisms allopatric speciation of squirrels in the grand canyon allopatric speciation new species arise as a result of geographic isolation rivers change course, mountains rise, continents drift, organisms migrate, and what was once a continuous. Reproductive isolation occurs because of physical, geographic separation of two populations. Effects that cause or reward a loss in genetic diversity can increase the chances of extinction of a species. Speciation, extinction, and biodiversity by thomas robison on. The model shows rapid sympatric speciation or extinction of species, depending on the strength of sexual selection. If you are a mac user, convert your ppt presentation into a pdf to avoid file. Speciation is a key process in ecology and evolutionary biology because it generates biodiversity. Chart and diagram slides for powerpoint beautifully designed chart and diagram s for powerpoint with visually stunning graphics and animation effects.
Students work in pairs to read through information on extinct and endangered animals to work out why they became extinctendangered and what we could do to help. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Continental drift allopatric sympatric speciation speciation without a geographic barrier driven by factors such as polyploidy, habitat. The study of islands as model systems has played an important role in the development of evolutionary and ecological theory. Explain what a mass extinction is and descrivbe the most recent do not memorize the 5 mass extinctions. Transformation of one ancestral species into more than one descendant species. Evolution, biodiversity, and population ecology pc\mac. Speciation and extinction video for 9th 12th grade. View notes speciation and extinction notes from biol 2631 at ohio northern university. Templates in powerpoint 2016 for mac can help you design interesting, compelling, and professionallooking presentations. Lt 8 i can contrast darwin and lamarcks ideas about changes in organisms over time. Speciation gradients and the distribution of biodiversity.
Speciation the origination of new species extinction the death of all organisms in a species adaptations specific morphological changes as a result of environmental pressures taxonomy discipline that assigns names to organisms and classifies biological diversity linnaeus. Powerpoint voor office 365 voor mac powerpoint 2019 voor mac powerpoint 2016. This mode of speciation has three distinguishing characteristics. Sympatric speciation speciation without a geographic barrier driven by factors such as polyploidy, habitat differentiation and sexual selection speciation may occur rapidly ex. Powerpoint presentation powerpoint presentation species can become extinct. We cant talk about how new species arise until we have some idea of what a species is. Winner of the standing ovation award for best powerpoint templates from presentations magazine. The relative rates of speciation and extinction are the same as those. The 50th anniversary of macarthur and wilsons december 1963 article, an equilibrium theory of insular zoogeography, was a recent milestone for this theme. We often see alarming reports about the global biodiversity crisis through the.
The same factors that increase the risk of species extinctions also reduce the chance that new species are formed. Worlds best powerpoint templates crystalgraphics offers more powerpoint templates than anyone else in the world, with over 4 million to choose from. You can download the powerpoint that accompanies this video from. In tropical forests alone, for example, biologists estimated that three species were being extinguished every hour. In parapatric speciation, two subpopulations of a species evolve reproductive isolation from one another while continuing to exchange genes. Background extinction rate extinction usually occurs one species at a time mass extinction events five events in earths history that killed off massive numbers of species at once 5095% of all species went extinct at one time humans are causing the sixth mass extinction event resource depletion population growth. This happens when a species cannot adapt and successfully reproduce under new environmental conditions or when it. A brief discussion of extinctions and mass extinctions is also included. Biodiversity, at the level of the species, is basically set by the balance between speciation and extinction. How is the interaction between dragonfly larva and sticklebacks an example of natural selection. Powerpoint presentation powerpoint presentation species can shape each other over time. More than 1600 species of birds have been recorded near the equator in the new world compared with. Apr 04, 2014 the same factors that increase the risk of species extinctions also reduce the chance that new species are formed.
Speciation diversity do we see speciation occurring today. Oct 22, 2012 speciation occurs at widely differing ratesa slow rate of speciation is seen with a living horseshoecrab which has diversified into species within the last300 million years. Speciation and extinction drive the appearance of directional. Speciation and extinction notes speciation extinction. In cichlid fish sympatric speciation has resulted from nonrandom mating due to sexual selection researchers from the university of leiden placed males and females of pundamilia pundamilia and p. Speciation occurs at widely differing ratesa slow rate of speciation is seen with a living horseshoecrab which has diversified into species within the last300 million years. Scribd is the worlds largest social reading and publishing site. Sep 18, 2015 limited geographic range is the most important determinant of genus extinction at background rates but becomes increasingly irrelevant as mass extinction arises. Distinguish between gradual speciation and punctuated equilibrium 4. Using templates in powerpoint for mac powerpoint for mac.
Gcse biology revision science section covering evolution, extinction, darwin, survival of the fittest, natural selection, evidence for evolution, rocks and fossils, example of evolution the horse, water vole. Speciation and extinction driven by environment dependent sexual selection. Extinction is the elimination of a species from earth. The appearance of directional trends in the evolution of species. Tekst, objecten en grafieken van animatie voorzien in powerpoint voor mac. Reproductive isolation must evolve so that mechanisms occur to reduce interbreeding between. Our new crystalgraphics chart and diagram slides for powerpoint is a collection of over impressively designed datadriven chart and editable diagram s guaranteed to impress any audience. Stickleback evolution in lake loberg is used as example of rapid speciation. Allopatric speciation speciation occurs when gene flow is interrupted or reduced when a population is divided into geographically isolated subpopulations. Speciation and extinction speciation and extinction have shaped the biodiversity we observe on earth today. Sympatric speciation speciation occurs even though the two groups are still living in the same area. It explains the means of speciation, both premating and post mating barriers, and also informs of what happens when a species goes extinct. Binarystate speciation and extinction method is conditionally robust.
Speciation and extinction video for 9th 12th grade lesson. Isolated populations undergo independent evolution and become adapted to separate environments. Biodiversity extinction and speciation references speciation. Jul 09, 2010 show the powerpoint which contains the task. Tekst, objecten en grafieken van animatie voorzien in powerpoint. Background extinctions occur continuously at a very low rate. Definitions speciation the origination of new species extinction the death of all organisms in a species adaptations specific morphological changes as a. More than 1600 species of birds have been recorded near the equator in. Evolution, mass extinctions and mass speciations are the result of ionizing radiation, magnetic field reversals, and other factors of an activated planet. A rapid rate of speciation is seen in galapagos fincheswhich have diversified into. Dianummers toevoegen aan uw presentatie in powerpoint voor mac.
A rapid rate of speciation is seen in galapagos fincheswhich have diversified into species within the last100,000 years. Speciation the apple maggot lays its eggs inside an apple, causing it to rot. Evolution of a new species due to geographic isolation occurs when physical barriers cause populations to divide and prevent mating, these include volcanoes, sealevel changes, and earthquake. Macroevolution, on the other hand, deals with the gain and loss of species through time.
Speciation, extinction, and the diversity of life peter. Speciation a free powerpoint ppt presentation displayed as a flash slide show on id. Ppt speciation powerpoint presentation free to download. Mar 02, 2016 im not discussing insect evolution today. Timeline presentations for powerpoint help make a detailed analysis of population of a particular animal. Speciation, extinction, and biodiversity by thomas robison.
Speciation and extinction driven by environment dependent. This article itemizes the keyboard shortcuts for powerpoint on mac. Keyboard shortcuts in powerpoint for mac office support. Evolution stress, extinction and speciation post 16 biology a level. The following feature list isnt comprehensive, but it gives you an idea of how powerpoint compares across the windows, mac, online, and mobile platforms. The moment of extinction is generally considered to be the death of the last individual of that species although the capacity to breed and recover may have been lost before this point. Theyll give your presentations a professional, memorable appearance the kind of sophisticated look that todays audiences expect. Compare powerpoint features on different platforms office support. The relative importance of factors contributing to diversification remains thus an active research area orr and smith 1998, losos and schluter 2000, rundle and nosil 2005, ricklefs and bermingham 2007, gavrilets and losos 2009, hortal et al. As the apple falls from the tree, the maggots dig in the ground and emerge as flies later. Mar 02, 2010 the moment of extinction is generally considered to be the death of the last individual of that species although the capacity to breed and recover may have been lost before this point. Yet the loss of biodiversity through the extinction of species, in which habitat destruction and. Speciation, extinction, and dispersal processes related to.
Extinction complete disappearance of a species from the earth. Extinction ppt free download as powerpoint presentation. Are we, as some scientists theorize, in the midst of the sixth mass extinction. Lt 9 i can describe the conditions required to be considered a species. Heal the world with free endangered backgrounds for powerpoint, as they help shed light on such animals that are close to extinction.
Adaptation, speciation and extinction in the anthropocene. Includes detailed notes covering chapter 3 sections 3 through 5 as discussed in class. Distinguish between pre and postzygotic reproductive barriers 5. Small populations are at much greater risk of extinction due to random events, such as weather. Speciation and extinction have shaped the biodiversity we observe on earth today. Take a statistical approach and show worldwide population trends of the endangered specie under observation. Organism and populations are constantly evolving and changing in response to their environment. Williams from uwmadison suggests that changes in regions such as the peruvian andes, portions of the himalayas and southern australia could have a profound impact on indigenous plants and animals williams and his research partners used computer models to estimate how various. In biology and ecology, extinction is the end of an organism or of a group of organisms taxon, normally a species.
Humans are also shaping selection pressures at the species level, and i discuss how species traits are affecting both extinction and speciation. Adaptive radiation is illustrated using the hawaiian honeycreeper. Reverse speciation is when those distinct species come together again, until they become one species yet again. Evolution stress, extinction and speciation post 16 biology a. Scholars explore speciation through adaptive radiation and extinction with a video that uses the threespines stickleback in alaska, and its current speciation due to poisoning of the lake as a model. Example extinction rates 10 times higher than predicted by fossil record 4 effects due to humans. Genetically controlled changes in physiology, anatomy, and behavior that occur to a species over time.
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