Ppt on extinct species in india

LIVING IN THE ENVIRONMENT 17 TH MILLER/SPOOLMAN Chapter 9 Sustaining Biodiversity: The Species Approach.

Biological extinction No species member alive Background extinction Natural low rate of extinction Extinction rate Percentage or number of species that go extinct in a certain time period Extinctions Are Natural but Sometimes They Increase Sharply (2) Mass extinction 3-5 events 50-95% of species became extinct From global changes in environmental conditions: major climate change, volcanoes, asteroid impacts Levels of species extinction Local extinction Ecological extinction Biological extinction Some Human/


Loss of Biodiversity EXTINCTION - the disappearance of a species Extinctions have been occurring constantly at a low background rate, usually matched.

increased rainfall) –This loss of biodiversity provided opportunities for dinosaurs to exploit 5. Cretaceous-Tertiary (K-T) - extinction of half of all marine species, many terrestrial plants and animals including the dinosaurs (65 mya) Possible causes: –Impact hypothesis - meteorite 10 km in diameter collided with the earth disrupting ecosystems –Volcanic activity inIndia” released material that blocked sunlight Ô earth became cooler Non-human causes of/


LIVING IN THE ENVIRONMENT 17 TH MILLER/SPOOLMAN Chapter 9 Sustaining Biodiversity: The Species Approach.

Sharply (1) Biological extinction - _____ species member alive Can lead to secondary extinctions of species with ______________ connections to the species already gone extinct Background extinction - _______________ low rate of extinction Extinction rate - percentage or number of species that go extinct in a certain _________ ___________ no strong natural timeperiod Extinctions Are Natural but Sometimes They Increase Sharply (2) Mass extinction - the extinction of many species in a relatively ____________/


LIVING IN THE ENVIRONMENT 17 TH MILLER/SPOOLMAN Chapter 9 Sustaining Biodiversity: The Species Approach.

Focus: Vultures, Wild Dogs, and Rabies: Unexpected Scientific Connections Vultures poisoned from diclofenac in cow carcasses in India More wild dogs eating the cow carcasses More rabies spreading to people 9-4 How Can We Protect Wild Species from Premature Extinction? Concept 9-4 We can reduce the rising rate of species extinction and help to protect overall biodiversity by establishing and enforcing national environmental laws and/


CHAPTER 24 HUMAN AWARENESS E10 HUMAN PRACTICES CAN LEAD TO MAJOR CHANGES IN COMMUNITIES.

species extinct HUMAN ACTIVITY Human activity has impacted species survival in a number of ways…most of which you will know SPECIES DIVERSITY Pollution Introduced species Mining Climate change Harvesting Habitat clearance INTRODUCED SPECIES Many species been introduced since European settlement They compete with natural species for resources Or feed on those species/ over the world average Three children die in India every minute form disease carried in polluted water Water is a disappearing resource /


» A GLOBAL COALITION to conserve threatened species and their habitats.

well-being) Biodiversity in crisis » The facts… Extinction rate 1000 x higher than “normal” 30,000 species / year 3 species / hour 15 to 37% of all species could be extinct by 2050 (Thomas /4. Birds – Uzbekistan » 5. Bird habitats (forests) – Angola » 6. River Dolphin – Bangladesh » 7. Amphibians – India » 8. Birds - Tanzania » Conservation Assessment of threatened Amphibians in Tama Bi-national Park, Colombia & Venezuela 2 >> Amphibians - Latin America 3 >> EDGE projects » 1. Chinese Giant Salamander »/


Population in the Wild: 25-40 individuals Population in Captivity: 170 individuals (approximate) Locality: Southwest Primoskiy Krai, of far eastern Russia.

% of world’s coral are climate change susceptible 42% of all species have declining populations 2 FAST FACTS: ENDANGERED SPECIES A SPECIES CONSIDERED TO BE FACING A (VERY) HIGH RISK OF EXTINCTION IN THE WILD 1 Population in the Wild: about 1,500 individuals Population in Captivity: about 2,500 individuals Locality: Bangladesh, Bhutan, China, India, Myanmar and Nepal 9 1 The International Union for Conservation of Nature/


Sustaining Biodiversity: The Species Approach Chapter 9.

species in the U.S. and abroad  Hot Spots  Habitat Conservation Plan (HCP) colony Case Study: The U.S. Endangered Species Act (2)  Mixed reviews of the ESA Weaken it Repeal it Modify it Strengthen it Simplify it Streamline it Confiscated Products Made from Endangered Species Science Focus: Accomplishments of the Endangered Species Act (1)  Species listed only when serious danger of extinction  Takes decades for most species/


Species extinction. current situation cause disadvantage action logical order.

cause disadvantage action logical order Now ! Earth is in our hands! Image that: if one day in the future only we human beings are living in the world. Would you like that? Look at the worrying animals extinction record in recent years! Dodo india 1781 Hippotragus leucophaeus north africa 1799 sprigtail india 1942 Panthera tigris sondaica Indonesia 1957 one species disappeared every 500-1000 years past now 10/


Sustaining Biodiversity: The Species Approach Chapter 9.

species in the U.S. and abroad  Hot Spots  Habitat Conservation Plan (HCP) colony Case Study: The U.S. Endangered Species Act (2)  Mixed reviews of the ESA Weaken it Repeal it Modify it Strengthen it Simplify it Streamline it Confiscated Products Made from Endangered Species Science Focus: Accomplishments of the Endangered Species Act (1)  Species listed only when serious danger of extinction  Takes decades for most species/


Extinction. Extinction The Definition and Causes.

as the Peruvian Andes could change drastically enough to lead to species extinctions. The climate change might also create new climates, providing new opportunities for other species to thrive, Williams said. Regions where novel climates are expected to form in tropical and subtropical regions include the western Sahara, southeastern U.S. and eastern India. Extinction Hotspots Where and what are hotspots?  “The concept of biodiversity hotspots/


Biogeography.

on how processes like speciation, extinction and dispersal  affect taxa and biotas. Sampling Species Richness How do we determine the total number of species in the area. Sampling effort Species accumulation curve Why do some areas have greater species diversity? Hypothesis #1 The number of species on any wall is determined by the number of of species in the regional species pool. Each time space in a site opens up, it/


In Class Assignment Biomes Name:___________________ ____________ contains widely scattered clumps of trees such as acacia which are covered with thorns,

extinctions Review of terms Local extinction- Biological extinction- Review of terms Local extinction- species is no longer found in one area it once inhabited but is found in other areas but is found elsewhere on earth Biological extinction- species is no longer found anywhere on earth; biological extinction is forever! Irreversible Current Extinction Rate Estimates Are Conservative Rate of species/malaria treatment Neem tree Azadirachta indica, India Treatment of many diseases, insecticide, spermicide Rosy /


ENVIRONMENTAL SCIENCE 13e CHAPTER 8: Sustaining Biodiversity: The Species Approach.

Quinine for malaria treatment Neem tree Azadirachta indica, India Treatment of many diseases, insecticide, spermicide Rosy periwinkle Fig. 8-7, p. 158 Ethical Obligations Intrinsic (existence) value Stewardship viewpoint 8-3 How Do Humans Accelerate Species Extinction? Concept 8-3 The greatest threats to any species are (in order) loss or degradation of its habitat, harmful invasive species, human population growth, pollution, climate change, and overexploitation/


Jacksury Puerta. Extinction is the process by which a species become extinct, no longer existing and living in the world. Extinction is a normal part.

led by global warning Known as the K/T extinction Famous for the death of the dinosaurs 75% of all species became extinct Happened at a rapid rate Caused: by a volcanic event that produced the Deccan traps of India An asteroid hit somewhere in the golf of Mexico in the Yucatan Peninsula Known as the Holocene extinction This extinction event started at the end of the last/


Biodiversity Three levels of Biodiversity How many species are there? What are the values of biodiversity? What threatens biodiversity? How do we protect.

of Species Extinction Local extinction Local extinction Ecological extinction Ecological extinction Biological extinction Biological extinction Fig. 9-2, p. 185 Passenger pigeon Great aukDodoDusky seaside sparrow Aepyornis (Madagascar) Some Prematurely Extinct Species Endangered and Threatened Species Endangered species- in immediate danger of extinction over all or part of their range Endangered species- in immediate danger of extinction over all or part of their range Threatened species- not in danger/


22 Sustaining Wild Species

Species Diversity Strategies for Protecting Biodiversity Species approach Ecosystem approach Species Extinction Local extinction Ecological extinction a species is no longer found in an area it once inhabited, but is still found elsewhere in the world Ecological extinction so few members of a species are left that it can no longer play its ecological roles in the biological communities where it is found Biological extinction is forever! Species Extinction Biological extinction a species/ to India Treatment /


Sustaining Biodiversity: Saving Species and Ecosystem Services

times higher than that background rate Extinctions Are Natural but Sometimes They Increase Sharply Biological extinction No species member alive Trophic cascade Population declines or extinctions among connected species Mass extinction Many species in a short amount of time Some Human Activities Hasten Extinctions and Threaten Ecosystem Services Background extinction rate 1 extinct species / year / 1 million species Extinction rates have risen recently Current extinction rate is at least 100 times higher/


Biodiversity and Endangered Species. Chapter Overview Questions How do scientists account for the development of life on earth? What is biological evolution.

periwinkle Cathranthus roseus, Madagascar Hodgkins disease, lymphocytic leukemia Fig. 9-7f, p. 196 Neem tree Azadirachta indica, India Treatment of many diseases, insecticide, spermicide Fig. 10-20, p. 207 Protect most diverse and endangered areas / Ex: Dinosaurs VOCABULARY: SPECIES EXTINCTION Species can become extinct: – __________: A species is no longer found in an area it once inhabited but is still found elsewhere in the world. – ____________: Occurs when so few members of a species are left they no /


1 Report of the World Commission on Dams remarks on its relevance in the Manitoba context presented at the Manitoba Clean Environment Commission hearings.

: Biodiversity  20% of 9000 freshwater fish species threatened, endangered or extinct, mainly due to habitat loss  N. America 123 species of fish, molluscs, crayfish, amphibians extinct during 20th century 123 species of fish, molluscs, crayfish, amphibians extinct during 20th century 38% of 292 US freshwater mussel species extinct/critically imperiled 38% of 292 US freshwater mussel species extinct/critically imperiled Extinction rate of US freshwater species 0.5% per decade (comparable to/


Chapter 22 Sustaining Wild Species Chapter 22 Sustaining Wild Species.

12e, p. 561 Neem tree Azadirachta indica, India Treatment of many Diseases acts as an insecticide Fig. 22.12f, p. 561 Overfishing Habitat loss Habitat degradation Introducing nonnative species Commercial hunting and poaching Sale of exotic pets/accounting Poverty Fig. 22.13, p. 564 Causes of Premature Extinction A. Habitat loss and degradation -Greatest threat to wild species -Greatest threat to wild species -In U.S. the major disturbances are… -In U.S. the major disturbances are… * agriculture * agriculture/


Evolution and Biodiversity G. Tyler Miller’s Living in the Environment 14 th Edition Chapter 5 G. Tyler Miller’s Living in the Environment 14 th Edition.

800 400 Number of families Millions of years ago Adaptive radiations are recovery periods after mass extinction when numerous new species evolve to fill niches in changed environments. It takes one to ten million years to rebuild biological diversity after a mass extinction/depletion. EURASIA AFRICA SOUTH AMERICA INDIA 135 million years ago Present 65 million years ago 225 million years ago 120°80°0/


Biodiversity and Endangered Species. Chapter Overview Questions How do scientists account for the development of life on earth? What is biological evolution.

periwinkle Cathranthus roseus, Madagascar Hodgkins disease, lymphocytic leukemia Fig. 9-7f, p. 196 Neem tree Azadirachta indica, India Treatment of many diseases, insecticide, spermicide Fig. 10-20, p. 207 Protect most diverse and endangered areas / Ex: Dinosaurs VOCABULARY: SPECIES EXTINCTION Species can become extinct: – __________: A species is no longer found in an area it once inhabited but is still found elsewhere in the world. – ____________: Occurs when so few members of a species are left they no /


Species and their vulnerability to extinction Before species become extinct they become rare. Rarity is assessed by three criteria: Endemic species often.

species in danger of extinction -93% of mammal species (28 species of lemurs) -99% of 144 species of frogs -90+% of 1500 plant species 8.2 The number of plant species endemic to the different states varies greatly Species are most vulnerable to extinction for five reasons Species/the southern coast of India. Largest species of carnivores (leopards and eagles) and the largest species of herbivores (elephants and deer) are currently at the greatest risk for extinction Fig. 8.4 3. Species that are not effective/


Sustaining Biodiversity: The Species Approach Chapter 9.

extinction: extinction of many species in a relatively short period of time. - 5 have occurred - Are we in the middle of a 6 th ?  Causes? Some Human Activities Cause Premature Extinctions; the Pace Is Speeding Up (1)  Levels of species extinction Local extinction Ecological extinction Biological extinction/Rauvolfia sepentina, Southeast Asia Anxiety, high blood pressure Neem tree Azadirachta indica, India Treatment of many diseases, insecticide, spermicide Foxglove Digitalis purpurea, Europe Digitalis for/


Chapter 22 Sustaining Wild Species Chapter 22 Sustaining Wild Species.

provide habitat. B. Species-by-Species Approach Identify most at-risk species Identify most at-risk species Understand the species Understand the species Focus on protecting them Focus on protecting them The Species ApproachThe Ecosystem Approach Goal Protect species from premature extinction Strategies Identify endangered species Protect their critical habitats Tactics Legally protect endangered species Manage habitat Propagate endangered species in captivity Reintroduce species into suitable habitats Goal/


Himalaya Regions Covering about 7,41,706 km area. stretches in arc shape from northern Pakistan, Nepal, Bhutan and the north-western and north-eastern.

elephant once faced the distinct possibility of complete extinction due to rampant hunting and poaching.tigerrhinoceroselephant Climate change: -Climate change may significantly affect the temperatures, rainfalls etc. -Ex. In the Western Ghats, studies have shown that the/ accounts for 7-8% of the recorded species of the world. In India 45,968 species of plants and 91,364 species of animals have been documented so far. India’s location and realms Biogeographically, India is situated at the tri- junction of /


» A GLOBAL COALITION to conserve threatened species and their habitats.

well-being) Biodiversity in crisis » The facts… Extinction rate 1000 x higher than “normal” 30,000 species / year 3 species / hour 15 to 37% of all species could be extinct by 2050 (Thomas /4. Birds – Uzbekistan » 5. Bird habitats (forests) – Angola » 6. River Dolphin – Bangladesh » 7. Amphibians – India » 8. Birds - Tanzania » Conservation Assessment of threatened Amphibians in Tama Bi-national Park, Colombia & Venezuela 2 >> Amphibians - Latin America 3 >> EDGE projects » 1. Chinese Giant Salamander »/


In every deliberation, we must consider our impact on the next seven generations. - The Iroqouis Confederacy.

extinction reduces the biodiversity, or variety of species found in a particular habitat or ecosystem. 27 There are five known major extinction events in Earth’s history. The most recent major extinction, about 65 million years ago, caused 75% of all species/ factory located near the town of Bhopal, India. Environmental regulations, worker protections, and government inspections were minimal. Chemicals that leaked into the air resulted in an immediate death toll in the thousands. A total of 558,125 injuries/


13e Sustaining Biodiversity: The Species Approach.

Quinine for malaria treatment Neem tree Azadirachta indica, India Treatment of many diseases, insecticide, spermicide Rosy periwinkle Fig. 8-7, p. 158 Ethical Obligations Intrinsic (existence) value Stewardship viewpoint 8-3 How Do Humans Accelerate Species Extinction? Concept 8-3 The greatest threats to any species are (in order) loss or degradation of its habitat, harmful invasive species, human population growth, pollution, climate change, and overexploitation/


MASS EXTINCTIONS. 3/21 B-BAT: EXPLAIN THE SIXTH MASS EXTINCTION IN THEIR OWN WORDS Do Now! What mass extinctions do you know of? How did those animals.

volcanic floods in India 16% of families, 47% of genera of marine organisms, and 18% of vertebrate families were lost CRETACEOUS– TERTIARY EXTINCTION THINK – PAIR - SHARE Close your notebooks Turn to your partner List the five mass extinctions and name some of their characteristics THE SIXTH MASS EXTINCTION Currently happening right now Named Anthropocene It is estimated there are 5 to 30 million living species on/


In every deliberation, we must consider our impact on the next seven generations. - The Iroqouis Confederacy.

extinction reduces the biodiversity, or variety of species found in a particular habitat or ecosystem. 30 There are five known major extinction events in Earth’s history. The most recent major extinction, about 65 million years ago, caused 75% of all species/ factory located near the town of Bhopal, India. Environmental regulations, worker protections, and government inspections were minimal. Chemicals that leaked into the air resulted in an immediate death toll in the thousands. A total of 558,125 injuries/


TREE SPECIES DIVERSITY IN PART OF WESTERN GHATS FORESTS IN INDIA V.K.Srivastava1, M.Niphadkar2, Neeti3, M.Kukreja4 1 = Land Resources Group, NRSA, HYDERABAD.

about 80per cent of the world’s 100,000 tree species are in the tropics and 10 per cent of all tree species are now threatened. As many as 77 tree species are already extinct and 976 tree species are critically endangered (Williams, 1998). In view of the above, Dept. of Biotechnology, Govt. of India, initiated a project in 1998 to characterization of Biodiversity at landscape level using remote/


Endangered Species. Endangered Species in Sri Lanka Green Turtle.

nest. The main threat to these birds is habitat loss. The forests they live in are being destroyed to make way for tea and crop plantations. Endangered Species in India White-bellied heron The white-bellied heron (Ardea insignis), also known as the / of Nature and Natural Resources (IUCN), Pere Daviddeer is extinct in the wild. All present population live in captivity. Captive Pere Davids Deers now number more than 1600 in China. The deer became extinct in China at the turn of the 20th century and it /


Can – or should we – prevent extinctions?. Unknown Number of Species on Earth 1.7 million are documented – mostly insects (about 1,000,000) and plants.

sesame, chickpea, fig, lentil, carrot, peas, okra, date, walnuts, coffee, cows, goats, pigs, and sheep From India, East Asia, and the Pacific Islands: soybeans, rice, banana, coconut, lemon, lime, orange, cucumber, eggplant, turnips,/extinctions have occurred 5 times in the last 500 million years – mostly from global climate change. From 1800 to 2100, about 25 percent of all species on Earth may become extinct. Humans are the primary cause of the extinctions. Species prone to extinction: small populations in/


Macroevolution & Speciation Chapter 24 & 26 Define a Species Isolation Extinction Events Geological Timetable Phylogenetics.

species from the earthThe elimination a species from the earth Background Extinction Rate - relatively constant rate of extinction in the fossil recordBackground Extinction Rate - relatively constant rate of extinction in the fossil record Mass Extinction - major loss of species: climate change, humans, catastrophiesMass Extinction - major loss of species/ years ago Eurasia CENOZOIC MESOZOIC PALEOZOIC North America Africa India South America Antarctica Australia Laurasia Gondwana Pangaea Continental Drift//


Intensive Programme on

species. Another keystone species in Canada is the beaver which modify large amounts of land through the flooding caused by their dams that generate ponds and lakes, allowing many aquatic species to thrive. If beavers were removed from an area, many species living in ponds would drop in numbers or go locally extinct. Disturbances and catastrophes change which species are found in/ million tonnes of topsoil has been wasted in the last 20 years - equivalent to all the topsoil in India! It is a real waste, and /


Evolution of Landforms and Organisms. Extinct: The process through which a species disappears completely from Earth. Not one more of that species.

have existed before on the Earth have become extinct? Fossils Can you name an organism that has lived before on the Earth and is now extinct? Dinosaurs Mass Extinction This occurs when large numbers of species die out in a fairly short period of time. They /instances of changes Answer : b- provide evidence of change Question 2 A scientist finds fossils from the same organism in both India and Africa. What is a possible explanation for this occurrence? a.Adaptation b.Continental drift c.Climate change d.Plate/


Populations: Extinctions and Explosions Chapter 28.

Alleles could be lost through genetic drift. These effects would not be likely in a larger population How can we preserve species? Some studies have predicted that about half of all the world’s species will go extinct in the next decade or two unless something is done to prevent it. We must/S. = 290 million people X 5.1 hectares = 1.48 billion hectares Area of U.S. = 0.91 billion hectares India = 1.05 billion people X 0.4 = 0.42 billion hectares How can we feed the world? We supply developing countries with/


Created by Raina Kahanu for Edu300 at Pacific University in May of 2010.

A ALBATROSS An Albatross is a large seabird. They live in the Southern Ocean*Southern Ocean* and North Pacific*.North Pacific 19 of the 21 species of Albatross are becoming extinct*.extinct They eat mostly cephalopods*, fish, and crustaceans.cephalopods Albatrosses /Peafowl http://en.wikipedia.org/wiki/Indian_peafowl http://en.wikipedia.org/wiki/Green_peafowl http://en.wikipedia.org/wiki/India http://en.wikipedia.org/wiki/Quail http://en.wikipedia.org/wiki/American_Robin http://en.wikipedia.org/wiki/Sparrow/


Introductory Questions #32 1)How can allele frequencies change in a population and increase variation? Give three examples. What do we call this when this.

extinction event? How many have occurred in the last 600 million years? 2 modes for the tempo of speciation Tempo of speciation: gradual vs. divergence in rapid bursts; Niles Eldredge and Stephen Jay Gould (1972); helped explain the non-gradual appearance of species in/2 cm/year Figure 15.3B Millions of years ago Eurasia CENOZOIC MESOZOIC PALEOZOIC North America Africa India South America Antarctica Australia Laurasia Gondwana Pangaea Continental Drift/Plate Tectonics Pangea (Paleozoic)  LaurasiaGondwana (/


OVERVIEW OF THE IMPACTS, VULNERABILITY AND ADAPTATION OF CLIMATE CHANGE FOR AGRICULTURE IN DIFFERENT REGIONS BASED ON IPCC FOURTH ASSESSMENT REPORT A.

, ENDANGERED, CRITICALLY ENDANGERED OR EXTINCT BY END OF 21 ST CENTURY  BY 2050, CROPS ARE EXPECTED TO SHOW A NORTHWARD EXPANSION IN AREA. GREATEST INCREASES IN CLIMATE- RELATED CROP YIELDS ARE EXPECTED IN NORTHERN EUROPE e.g., WHEAT/FARMLAND, USING SUPERIOR CROP SPECIES, USING DRYLAND FARMING, ADAPTING CULTURAL TECHNIQUES ARE SUGGESTED  IN BANGLADESH AGRICULTURAL ADAPTATION STRATEGIES INCLUDED RICE GENOTYPE DEVELOPMENT TO SUSTAIN ITS YIELD  IN INDIA INTEGRATED AGROMETEOROLOGICAL ADVISORY SERVICES /


22 Sustaining Wild Species Miller’s - Living in the Environment 13 th Edition.

to reappear ~ 34,000 currently near extinction Endangered  species in danger of extinction within range Usually exhibit specific characteristics as warning signs Threatened  low species population Passenger pigeon Great auk Dodo Dusky seaside sparrow Aepyornis(Madagascar) Animal species that have become prematurely extinct ‘Endangered’ and ‘Threatened’ Species Endangered speciesEndangered speciesspecies with so few individual survivors that the species could soon become extinct over all or most of its/


Bell Questions 1/11/11 1.What are the three levels of biodiversity? 2.What group of organisms has the most unknown species? 3.A _______________ is critical.

made Atlantic ocean, global warming 5.65 mya – asteroid impact and volcanism in India Current Extinctions 25% of species have or are expected to become extinct between 1900 and 2100 different than past extinctions because humans are the primary cause Species Prone to Extinction 1.species that migrate 2.species that need large or special habitats 3.species that are exploited by humans Large populations that adapt easily to many habitats/


How Biological Diversity Evolves MACROEVOLUTION. Biology and Society: The Sixth Mass Extinction Over the past 600 million years the fossil record reveals.

reduced Sea levels dropped The dry continental interior increased in size Many extinctions occurred Pangaea Present Paleozoic Cenozoic Mesozoic 251 million years ago 135 65 Laurasia Gondwana Eurasia India Madagascar North America Africa South America Antarctica Australia / fossil record shows that: The climate cooled Seas were receding Many plant species died out Dinosaurs (except birds) became extinct A thin layer of clay rich in iridium was deposited © 2010 Pearson Education, Inc. Question: Is the iridium/


History of Life on Earth Chapter 25. Overview First Cells Major Life events Fossil Record Geologic Time scale Mass extinctions Continental Drift.

of years ago 65.5 135 Mesozoic 251 Paleozoic Gondwana Laurasia Eurasia India Africa Antarctica Australia North America Madagascar Cenozoic Present 10 MYA India (previously an island) hits Asia 50 MYA. Australia becomes completely /, climate change. Drop in sea level, loss of shoreline & intertidal, More severe continental weather Isolated species come together and compete, causing extinctions Paleozoic to Mesozoic boundary Cretaceous extinctions 65.5 MYA Wiped out 50 % marine species, on land many families/


Introductory Questions #1 (fifth overall) 1)How would you define a species? What are two key factors you must consider? 2)What is the key as to how a new.

destroy life –Example: Krakatau Figure 15.4B, C The elimination a species from the earthThe elimination a species from the earth Background Extinction Rate - relatively constant rate of extinction in the fossil recordBackground Extinction Rate - relatively constant rate of extinction in the fossil record Mass Extinction - major loss of species: climate change, humans, catastrophiesMass Extinction - major loss of species: climate change, humans, catastrophiesExtinction Figure 15.5 90 million years ago807065/


1 Air Pollution. 2 THE AIR AROUND US  Air pollution-physical or chemical changes brought about by natural processes or human activities that result in.

National Geographic NewsNational Geographic News In Costa Rica about 2/3 of the 110 known Harlequin frog species are extinctIn Costa Rica about 2/3 of the 110 known Harlequin frog species are extinct 76 Global Warming Already Causing Extinctions, Scientists Say Hannah Hoag for/Reduce? Global Warming is a factGlobal Warming is a fact China and India will soon surpass U.S.A. in Greenhouse gas emissionChina and India will soon surpass U.S.A. in Greenhouse gas emission If we do nothing, they will continue to do/


Evolution & Biodiversity  Biodiversity=richness of living species  Varieties of species that exist  Genetic diversity  Species diversity  Habitat.

: two different species evolved out of one. Might be due to new geography. Extinction: no members of species left on Earth Extirpation: no members of that species left in area. (wolves in Iowa) Species: to be in the same species, must be capable/Rate : 1-2 cm/year Figure 15.3B Millions of years ago Eurasia CENOZOIC MESOZOIC PALEOZOIC North America Africa India South America Antarctica Australia Laurasia Gondwana Pangaea Continental Drift/Plate Tectonics Pangea (Paleozoic)  LaurasiaGondwana (Mesozoic)  /


Mass Extinctions. Outline What is a mass extinction? Famous mass extinctions The good and bad.

For genus to go extinct, all species in it must go extinct For family, all genera must go extinct What is a Mass Extinction? We mean a sharp increase in the number of species/genus/family extinctions in a short time In last 540 million years (since we’ve had complex life), have had five in which >50% of animal species went extinct What is a Mass Extinction? The “Big Five” extinctions In all cases more than/


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