SB Ch. 6 Extinction Lecture
... “We are fortunate to have evolved when biological diversity has been at the greatest level ever achieved. Succeeding human generations will not be as fortunate: the current extinction crisis is without precedent—never before has a single species been responsible for such a massive loss of diversit ...
... “We are fortunate to have evolved when biological diversity has been at the greatest level ever achieved. Succeeding human generations will not be as fortunate: the current extinction crisis is without precedent—never before has a single species been responsible for such a massive loss of diversit ...
Conservation biology
... Current accelerating loss of habitat 20% of present day species will be extinct by the middle of this century 2000 of the world’s 8600 species of birds could go extinct The evolutionary history of extinction Almost 99% of the species that one time existed have become extinct Mass extinctio ...
... Current accelerating loss of habitat 20% of present day species will be extinct by the middle of this century 2000 of the world’s 8600 species of birds could go extinct The evolutionary history of extinction Almost 99% of the species that one time existed have become extinct Mass extinctio ...
Extinction: a Natural versus Human
... • 50% of all genera lost, on land and sea • Demise of dinosaurs as dominant group • Impact of extraterrestrial object is the generally accepted cause ...
... • 50% of all genera lost, on land and sea • Demise of dinosaurs as dominant group • Impact of extraterrestrial object is the generally accepted cause ...
Extinction
... Probable Cause: Us Habitat destruction - estimated that 5-10% of species will be extinct in thirty years Global warming – estimated that ~35% of species will become committed to extinction in the next fifty years ...
... Probable Cause: Us Habitat destruction - estimated that 5-10% of species will be extinct in thirty years Global warming – estimated that ~35% of species will become committed to extinction in the next fifty years ...
Essential Question: How can changes in an organism`s environment
... • While species have evolved and disappeared throughout time, experts warn that today's rate of extinction is alarmingly high. Scientists say that it is natural to lose one species every 100 years. Yet North America has lost more than 500 species since 1620. The National Wildlife Federation, an orga ...
... • While species have evolved and disappeared throughout time, experts warn that today's rate of extinction is alarmingly high. Scientists say that it is natural to lose one species every 100 years. Yet North America has lost more than 500 species since 1620. The National Wildlife Federation, an orga ...
Endangered and Extinct Species Rubric
... Endangered and Extinct Species Rubric Identification of the plant or animal that is endangered, threatened or extinct. ...
... Endangered and Extinct Species Rubric Identification of the plant or animal that is endangered, threatened or extinct. ...
Brown Tree Snake
... Impacts of Invasive Species Decrease in local/global biodiversity --> decrease ecosystem health --> extinction competition change to habitat domination of habitat changes in predator/prey relationships carry disease hybridization ...
... Impacts of Invasive Species Decrease in local/global biodiversity --> decrease ecosystem health --> extinction competition change to habitat domination of habitat changes in predator/prey relationships carry disease hybridization ...
Science 9: Unit A: Biological Diversity
... unsuitable for the organisms living there. Acid rain, polluted streams and oceans all destroy habitats, kill off organisms, and reduce biodiversity. II. Greenhouse Effect has forced many species adapted to colder environments to retreat further north. Arctic species may go extinct from a loss of the ...
... unsuitable for the organisms living there. Acid rain, polluted streams and oceans all destroy habitats, kill off organisms, and reduce biodiversity. II. Greenhouse Effect has forced many species adapted to colder environments to retreat further north. Arctic species may go extinct from a loss of the ...
The Biodiversity Crisis - Tuscaloosa County High School
... Protection of habitats • Habitat loss/degradation is the number one cause of threatened and endangered species in the U.S. • Most of these species are ‘specialists’ – species that occupy a narrow niche and have specific requirements • Habitat fragmentation makes it worse • Degradation of habitat thr ...
... Protection of habitats • Habitat loss/degradation is the number one cause of threatened and endangered species in the U.S. • Most of these species are ‘specialists’ – species that occupy a narrow niche and have specific requirements • Habitat fragmentation makes it worse • Degradation of habitat thr ...
3.3 Threats to Biodiversity (Pages100-109)
... overexploitation, disrupting connectivity across ecosystems and extinction. • I can explain how biodiversity is beneficial to humans. • I can suggest ways to preserve ...
... overexploitation, disrupting connectivity across ecosystems and extinction. • I can explain how biodiversity is beneficial to humans. • I can suggest ways to preserve ...
Evolution
... Use evidence to explain why a species has become extinct or adapted to changing conditions. Evaluate whether evidence for a species changing over time supports natural selection. ...
... Use evidence to explain why a species has become extinct or adapted to changing conditions. Evaluate whether evidence for a species changing over time supports natural selection. ...
glossary
... fairly steady rate over geological time and is the result of normal evolutionary processes, with only a limited number of species in an ecosystem being affected at any one time. Mass Extinction: The extinction of a large number of species within a relatively short period of geological time, thought ...
... fairly steady rate over geological time and is the result of normal evolutionary processes, with only a limited number of species in an ecosystem being affected at any one time. Mass Extinction: The extinction of a large number of species within a relatively short period of geological time, thought ...
Unit Curriculum Map for Environmental Science
... a. Describe factors affecting population growth of all organisms, including humans. Relate these to factors affecting growth rates and carrying capacity of the environment. c. Explain how human activities affect global and local sustainability. d. Describe the actual and potential effects of habitat ...
... a. Describe factors affecting population growth of all organisms, including humans. Relate these to factors affecting growth rates and carrying capacity of the environment. c. Explain how human activities affect global and local sustainability. d. Describe the actual and potential effects of habitat ...
Population Collapses
... The number of species which are known to have been driven to extinction as a result of targeted human action is relatively small. A much larger number have a high probability of becoming extinct in the medium- to long-term future. Several examples are well known. While blue whales (and several other ...
... The number of species which are known to have been driven to extinction as a result of targeted human action is relatively small. A much larger number have a high probability of becoming extinct in the medium- to long-term future. Several examples are well known. While blue whales (and several other ...
Endangered Species
... extinction is generally considered to be the death of the last individual of that species. In species which reproduce sexually, extinction of a species is generally inevitable when there is only one individual of that species left, or only individuals of a single sex. Extinction is not an unusual ev ...
... extinction is generally considered to be the death of the last individual of that species. In species which reproduce sexually, extinction of a species is generally inevitable when there is only one individual of that species left, or only individuals of a single sex. Extinction is not an unusual ev ...
What effect does speciation and extinction have on biological
... are a part; this includes diversity within species, between species, and of ecosystems Includes genetic variation within species, the variety of species in an area, and the variety of habitat types within a landscape ...
... are a part; this includes diversity within species, between species, and of ecosystems Includes genetic variation within species, the variety of species in an area, and the variety of habitat types within a landscape ...
Biodiversity Extinction and speciation References Speciation
... signed at the 1992 Rio Earth Summit, biological diversity is about more than plants, animals and micro organisms and their ecosystems – it is about people and our need for food security, medicines, fresh air and water, shelter, and a clean and healthy environment in which to live. Yet the loss of b ...
... signed at the 1992 Rio Earth Summit, biological diversity is about more than plants, animals and micro organisms and their ecosystems – it is about people and our need for food security, medicines, fresh air and water, shelter, and a clean and healthy environment in which to live. Yet the loss of b ...
3.4 Ecosystem Changes
... Populations are doomed when the death rate is greater than the birth rate. This is referred to as fatal subtraction. These organisms have fallen below their minimal viable population size. Specialization may make species vulnerable to changing environments. For example, if a food source is destroye ...
... Populations are doomed when the death rate is greater than the birth rate. This is referred to as fatal subtraction. These organisms have fallen below their minimal viable population size. Specialization may make species vulnerable to changing environments. For example, if a food source is destroye ...
Notebook #8 Extinctions
... they clear the way for new kinds of life; opportunity exists for another species to fil that ecological niche Niche- place or position ...
... they clear the way for new kinds of life; opportunity exists for another species to fil that ecological niche Niche- place or position ...
Ecology
... determined by the number of different species in that area. • There are 2 main types: Number of different species in a community 1) Genetic Diversity ...
... determined by the number of different species in that area. • There are 2 main types: Number of different species in a community 1) Genetic Diversity ...
Extinction
In biology and ecology, extinction is the end of an organism or of a group of organisms (taxon), normally a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and recover may have been lost before this point. Because a species' potential range may be very large, determining this moment is difficult, and is usually done retrospectively. This difficulty leads to phenomena such as Lazarus taxa, where a species presumed extinct abruptly ""reappears"" (typically in the fossil record) after a period of apparent absence.The age of the Earth is about 4.54 billion years old. The earliest undisputed evidence of life on Earth dates at least from 3.5 billion years ago, during the Eoarchean Era after a geological crust started to solidify following the earlier molten Hadean Eon. There are microbial mat fossils found in 3.48 billion-year-old sandstone discovered in Western Australia. Other early physical evidence of a biogenic substance is graphite in 3.7 billion-year-old metasedimentary rocks discovered in Western Greenland. More than 99 percent of all species, amounting to over five billion species, that ever lived on Earth are estimated to be extinct. Estimates on the number of Earth's current species range from 10 million to 14 million, of which about 1.2 million have been documented and over 86 percent have not yet been described.Through evolution, species arise through the process of speciation—where new varieties of organisms arise and thrive when they are able to find and exploit an ecological niche—and species become extinct when they are no longer able to survive in changing conditions or against superior competition. The relationship between animals and their ecological niches has been firmly established. A typical species becomes extinct within 10 million years of its first appearance, although some species, called living fossils, survive with virtually no morphological change for hundreds of millions of years. Mass extinctions are relatively rare events; however, isolated extinctions are quite common. Only recently have extinctions been recorded and scientists have become alarmed at the current high rate of extinctions. Most species that become extinct are never scientifically documented. Some scientists estimate that up to half of presently existing plant and animal species may become extinct by 2100.