Presentation on theme: "Chapter 5: Evolution and Community Ecology"— Presentation transcript:
1 Chapter 5: Evolution and Community Ecology Mr. ManskopfNotes Can Also Be Found at
2 Section 1: EvolutionDescribe the four primary mechanisms of biological evolutionDescribe how speciation and extinction affect the diversity of life on Earth.TERMS: evolution, gene mutation, genetic drift, natural selection, fitness, adaptation, artificial selection, speciation, extinction.
3 Incredible Diversity of Life 1.5 to 1.8 million known speciesPossibly millionTropical Rain Forests, Coral Reefs and everywhere else
4 Evolution What makes you, YOU? What makes each species unique and different?
5 Genes Sequences of DNA codes for each particular trait Tall, small, blue eyes, human, goldfish, pine treeEvolution is a change of genes over time
6 Evolution “Change over time” Change of Gene Pool over time Why would genes change over time?
11 Genetic Drift Evolution that occurs by chance Natural Disasters Run in with human nets, etc.
12 Natural SelectionProcess by which traits useful for survival and reproduction are passed on more frequently than those that are not
13 3 Conditions for Natural Selection Organisms produce more offspring than can survive.Nature has limitations (limiting factors)Struggle for survival
14 3 Conditions for Natural Selection (2) Individuals vary in characteristics, some of which are heritableNot every species is sameSome fish are faster, darker, smallerGenes differentHeritable Differences
15 3 Conditions for Natural Selection (3) Individuals vary in fitness, or reproductive successSurvival of FittestFittest for its environmentAdaptation: an inherited trait that increases an organisms chance of survival and reproduction.
16 Travel to Ecuador to see how the process of natural selection operates
17 Adaptations Desert plants have small or no leaves at all The insect that blends in and is able to survive may be more likely to reproduce.
18 Adaptations White coat of polar bear helps in hunting Results of natural selection all around usNATURE SELECTSAdaptationsBig ears of desert jack rabbit allow it to cool off quicklyLong neck of giraffe allow it to reach food
19 Did You Know? Darwin privately researched natural selection for two decades before publishing On the Origin of Species.
26 Artificial SelectionSelecting desirable traits and breeding only those with those traits.
27 Speciation: How did we get millions of species?
28 SpeciationProcess by which new species are generatedCan occur in a number of different ways; the most important way is called allopatric speciation– Geographic IsolationHas resulted in every form of life on Earth— today and in the past
29 The canyon is a barrier to dispersal by small mammals, and as a consequence the isolated populations can diverge.
31 Extinction The disappearance of species from Earth Generally occurs gradually, one species at a time, when environmental conditions change more rapidly than the species can adaptThere are five known mass extinction events, each of which wiped out a large proportion of Earth’s species.
32 Biodiversity has increased over time, but mass extinctions are also natural events (5 major events) How do we get this data?Did You Know? During the Permo-Triassic extinction 250 million years ago, 70% of all land species and 90% of all marine species went extinct.
33 Extinctions Species gone forever NORMAL Mass Extinction: short period of time when large number of species go extinct (65 MYA)Currently in mass extinction…caused by humansRapid climate change
34 ExtinctionsThe zebra mussel has completely displaced 20 native mussel species in Lake St. Clair.
35 Section 1: Evolution Review Describe the four primary mechanisms of biological evolutionDescribe how speciation and extinction affect the diversity of life on Earth.TERMS: evolution, gene mutation, genetic drift, natural selection, fitness, adaptation, artificial selection, speciation, extinction
36 Section 1 Quiz1) Which of the following best describes a successful individual in evolutionary terms? A. A successful individual possesses traits that are different from the traits of the rest of the population. B. A successful individual produces many offspring that possess unique traits. C. A successful individual is well adapted to its environment and produces offspring that survive to pass on genes. D. A successful individual will be well adapted to its environment and produce a few high quality offspring.A. A successful individual possesses traits that are different from the traits of the rest of the population.
37 2) In the history of the world, how many mass extinctions have occurred? A. 5 B. 7 C. 10 D. 13
38 3) In a mass extinction, the rate of extinction exceeds A. 99 percent 3) In a mass extinction, the rate of extinction exceeds A. 99 percent. B. 85 percent. C. the rate of environmental change. D. the rate of background extinction.D. the rate of background extinction
39 4) A reintroduced population of wolves in a national park is 90% grey and 10% black, consistent with the wolf population in other regions. After several generations in isolation, the national park’s wolf population is 60% grey and 40% black. The wolf population has likely experienced A. natural selection. B. genetic drift. C. mutations. D. migration.genetic driftEvolution that occurs by chance
40 5) When the environment changes too quickly for an organism to adapt, what will occur? A) Evolution B) Speciation C) Genetic Drift D) ExtinctionD. Extinction
41 True or False6) Two populations of a deer species are separated when a glacier forms. After the glacier melts, the two populations have become different species. This is an example of allopatric speciation.TRUE
42 Short Answer7) A disaster wipes out 50 percent of a small population of birds. Prior to the disaster, about half the birds had a green wing patch and half had a blue wing patch. Several generations after the disaster, only 10% have a blue wing patch, and 90% have a green wing patch. What do you infer happened, and why?The bird population experienced genetic drift as the result of a sudden catastrophe. The disaster reduced genetic diversity in the population and changed the proportion of birds with a green wing patch vs. a blue wing patch.
43 Short Answer8) Pronghorn are a species of extremely fast hooved mammal that live on the plains of western North America. They are so fast that no current North American predator can catch them. During the ice age, cheetahs occupied North America. Speculate about how pronghorn became so fast.Pronghorn probably evolved in an evolutionary “arms race” with the cheetah population. They became faster and faster to escape from cheetahs, which were probably fast enough to catch them.
51 Fundamental vs. Realized Niche Fundamental = Without competition Realized = With competition (restricted niche)
52 CompetitionOrganisms compete when they seek the same limited resource.In rare cases, one species can entirely exclude another from using resources.To reduce competition, species often partition resources, which can lead to character displacement.
57 PredationDefensive traits such as camouflage, mimicry, and warning coloration have evolved in response to predator-prey interactions.
58 PredationSome predator-prey relationships are examples of coevolution, the process by which two species evolve in response to changes in each other.Rough-Skinned NewtDid You Know? A single rough-skinned newt contains enough poison to kill 100 people. Unfortunately for the newt, its predator, the common garter snake, has coevolved resistance to the toxin.
59 CoevolutionThe Madagascar star orchid produces nectar at the bottom part of its slim, foot-long throat. After observing a specimen, Charles Darwin predicted the existence of a moth with a proboscis long enough to reach that nectar. Sure enough, decades later the giant hawk moth of Madagascar was discovered.
60 Parasitism and Herbivory (+/–) Parasitism: One organism (the parasite) relies on another (the host) for nourishment or for some other benefitHerbivory: An animal feeding on a plant
61 Parasitism and Herbivory (+/–) Malaria is a disease caused by a parasite called Plasmodium that is spread to humans by the bite of an infected Anopheles mosquito.
63 Mutualism (+/+) and Commensalism (+/0) Mutualism: a relationship in which two or more species benefitCommensalism: a relationship in which one species benefits while the other is unaffected
64 Mutualism (+/+) and Commensalism (+/0) Clown Fish and Sea Anemones demonstrate mutualism because Anemones provide the Clown Fish with protection from predators while Clown fish defend the Anemones from Butterfly fish who like to eat Anemones.
65 Mutualism (+/+) and Commensalism (+/0) Barnacles adhering to the skin of a whale or shell of a mollusk
67 Section 2 Review Species Interaction Discuss the factors that influence an organisms nicheCompare and contrast predation, parasitism, herbivoryDescribe mutualism and commensalismTERMS: niche, tolerance, resource partitioning, predation, coevolution, parasitism, herbivory, mutualism, commensalism.
68 Section 2 Quiz B. Resource Partitioning 1) Madagascar, several species of lemur eat bamboo, but each species specializes in one part of the bamboo—one species eats mature bamboo stalks, one species eats bamboo shoots, and one species eats leaves. This is an example ofA. speciation.B. resource partitioning.C. competition.D. niche partitioning.B. Resource Partitioning
69 2) In the example above, one lemur species eats only bamboo shoots 2) In the example above, one lemur species eats only bamboo shoots. Bamboo shoots contain a high level of cyanide, a toxic chemical. This lemur species has developed a tolerance for a certain amount of cyanide. What do you think will happen over time? A. The level of cyanide in the bamboo population will increase. B. The level of cyanide in the bamboo population will decrease. C. The level of cyanide in the bamboo population will remain the same. D. The level of cyanide in the lemur population will decrease.A. The level of cyanide in the bamboo population will increase.
70 3) Two species of finch live in the same environment 3) Two species of finch live in the same environment. Over time, one develops a larger beak to consume larger seeds, while the other develops a narrow beak to consume more delicate seeds. This is an example of A. resource partitioning. B. character displacement. C. coevolution. D. competitive exclusion.C. coevolution.
71 4) An interaction in which an individual of one species kills and consumes an individual of another is called A. predation. B. parasitism. C. herbivory. D. symbiosis.A. predation
72 5) In the western United States, at the southern edge of their range, moose are sometimes so severely infested with ticks that they die. The tick/moose relationship is best described as A. predatory. B. parasitic. C. symbiotic. D. mutualistic.B. parasitic.
73 6) A beehive depends on pollen from flowers to survive 6) A beehive depends on pollen from flowers to survive. Flowers depend on bees to pollinate them. The relationship among these two sets of organisms is A. parasitic. B. commensalist. C. herbivory D. mutualistic.D. mutualistic.
74 7) A niche restricted by competition is a A. fundamental niche. B 7) A niche restricted by competition is a A. fundamental niche. B. realized niche. C. resource partitioned niche. D. displaced niche.B. realized niche
75 8) A deer browsing on a shrub is an example of A. predation. B 8) A deer browsing on a shrub is an example of A. predation. B. parasitism. C. herbivory. D. photosynthesis.C. herbivory.
76 True or False You have many species of bacteria living in your gut that help you with digestion. This relationship is best defined as commensalism.False: Mutualism
77 Short Answer 9) Explain the difference between mutualism and commensalisms, with examples. In mutualism and commensalism, both species are unharmed. In mutualism, both species benefit, as in the example of the hawk moth pollinating the flower; the flower is pollinated and the moth is fed. In commensalism, one species benefits while the other doesn’t experience a negative or a positive effect. Trees providing shade and moisture to desert shrubs is an example of commensalism.