![4.2.2-.4 Causes of Extinction](http://s1.studyres.com/store/data/000774701_1-9a7c646973b61e374fee93807dea29b3-300x300.png)
4.2.2-.4 Causes of Extinction
... Rates of extinction are very difficult to estimate, because we don't even know within an order of magnitude how many species there are. Fossil records can reveal the average "lifetimes" of species, or how long different classes of plants and animals generally exist on the earth before going ...
... Rates of extinction are very difficult to estimate, because we don't even know within an order of magnitude how many species there are. Fossil records can reveal the average "lifetimes" of species, or how long different classes of plants and animals generally exist on the earth before going ...
File
... Fill in the blanks with a word or phrase that correctly completes the sentence. 15. A species that is in danger of going extinct it said to be _endangered____. 16. The evaporation of water from plants is called __transpiration____. 17. The process in which water is absorbed into the soil is called ...
... Fill in the blanks with a word or phrase that correctly completes the sentence. 15. A species that is in danger of going extinct it said to be _endangered____. 16. The evaporation of water from plants is called __transpiration____. 17. The process in which water is absorbed into the soil is called ...
Ch5ReadingStudyGuide
... Populations can be separated in many ways *What are some ways that populations can be separated? ...
... Populations can be separated in many ways *What are some ways that populations can be separated? ...
Biodiversity and Sustainability
... The more organism that can fulfill a particular niche (energy role) in an ecosystem the more likely it is to sustain a threat. Choose 3 of the following threats to ecosystem sustainability and explain why this is true: ...
... The more organism that can fulfill a particular niche (energy role) in an ecosystem the more likely it is to sustain a threat. Choose 3 of the following threats to ecosystem sustainability and explain why this is true: ...
Nature Reserve: Botanical Society Nature Reserves
... eight botanically important sites in KwaZulu-Natal, totalling over 15 000 hectares, that form part of the priority areas identified in the Maputaland–Pondoland–Albany Hotspot. These sites are owned by private individuals, communities or municipalities. Conserving intact vegetation and endemic plan ...
... eight botanically important sites in KwaZulu-Natal, totalling over 15 000 hectares, that form part of the priority areas identified in the Maputaland–Pondoland–Albany Hotspot. These sites are owned by private individuals, communities or municipalities. Conserving intact vegetation and endemic plan ...
INVASIVE SPECIES 6-8
... Benchmark B: Describe the characteristics of an organism in terms of a combination of inherited traits and recognize reproduction as a characteristic of living organisms essential to the continuation of the species. Grade Seven: Evolutionary Theory 8. Investigate the great diversity among organisms. ...
... Benchmark B: Describe the characteristics of an organism in terms of a combination of inherited traits and recognize reproduction as a characteristic of living organisms essential to the continuation of the species. Grade Seven: Evolutionary Theory 8. Investigate the great diversity among organisms. ...
AP Environmental Science: Benchmark 3 Study Guide
... biotic and abiotic components of the environment o Other things to know Ecotone: overlapping boundaries of adjacent habitats Habitat fragmentation: human disruption of a habitat that makes it difficult or impossible for an population to move throughout it’s original habitat (i.e. road or subdi ...
... biotic and abiotic components of the environment o Other things to know Ecotone: overlapping boundaries of adjacent habitats Habitat fragmentation: human disruption of a habitat that makes it difficult or impossible for an population to move throughout it’s original habitat (i.e. road or subdi ...
Chapter 1 Environmental Problems, Their Causes
... Climate is a region’s long-term atmospheric conditions over decades. The two main factors in determining climate are average temperature and average precipitation. The average climate—annual precipitation and temperature—determines terrestrial regions with characteristic types of natural ecological ...
... Climate is a region’s long-term atmospheric conditions over decades. The two main factors in determining climate are average temperature and average precipitation. The average climate—annual precipitation and temperature—determines terrestrial regions with characteristic types of natural ecological ...
RATCLIFFE CRITERIA
... nature conservation deals largely with semi-natural habitats. Seminatural habitats must nevertheless exhibit a level of quality marked by a lack of features which indicate gross or recent human modification. This criterion has to take into account the fact that some habitats, (e.g. grasslands, heath ...
... nature conservation deals largely with semi-natural habitats. Seminatural habitats must nevertheless exhibit a level of quality marked by a lack of features which indicate gross or recent human modification. This criterion has to take into account the fact that some habitats, (e.g. grasslands, heath ...
Skinner Chapter 17
... the consequent loss of habitats is the most likely cause of this mass extinction. 48. The requirements are (1) structural support; (2) an internal aquatic ...
... the consequent loss of habitats is the most likely cause of this mass extinction. 48. The requirements are (1) structural support; (2) an internal aquatic ...
Presentationch5
... • Elephants need to eat 5% of their body weight in plant material each day but they can only digest about 40% of the food they eat. • There is an average 90% loss in available energy as one moves to the next higher trophic level. • 10% of the energy entering one level passes to the next. ...
... • Elephants need to eat 5% of their body weight in plant material each day but they can only digest about 40% of the food they eat. • There is an average 90% loss in available energy as one moves to the next higher trophic level. • 10% of the energy entering one level passes to the next. ...
Biological Diversity
... •Mainly effected animals rather than plants Possible causes: •Climate change •Flood basalt eruptions •Impact event ...
... •Mainly effected animals rather than plants Possible causes: •Climate change •Flood basalt eruptions •Impact event ...
Ch57 quiz-student copy
... 18. Major causes of human-induced extinctions of species include all of the following, except a. climate modification. b. overexploitation. c. habitat destruction. d. captive propagation. e. introduction of predators and diseases. 19. Which of the following is not true of extinctions that occurred a ...
... 18. Major causes of human-induced extinctions of species include all of the following, except a. climate modification. b. overexploitation. c. habitat destruction. d. captive propagation. e. introduction of predators and diseases. 19. Which of the following is not true of extinctions that occurred a ...
FirstExamTextGuide
... But remember extinction is forever! Some species come back rather easily from dramatic loss-turkeys. Who said “the first law of intelligent tinkering is to keep every cog and wheel.” We will talk about efforts to preserve large scale ecosystems=wildlands project, later in the semester. P183 and p184 ...
... But remember extinction is forever! Some species come back rather easily from dramatic loss-turkeys. Who said “the first law of intelligent tinkering is to keep every cog and wheel.” We will talk about efforts to preserve large scale ecosystems=wildlands project, later in the semester. P183 and p184 ...
Fossil record should help guide conservation in a changing world_
... Key to assessing the health of today's rapidly changing ecosystems is understanding their history, which can only be read from the fossil record, or the paleobiology of the region, the scientists argue. "In the past, conservation biology was about trying to hold everything static, to save everythin ...
... Key to assessing the health of today's rapidly changing ecosystems is understanding their history, which can only be read from the fossil record, or the paleobiology of the region, the scientists argue. "In the past, conservation biology was about trying to hold everything static, to save everythin ...
Ecosystems and Interdependence
... explore the relationships between species and how all things are interdependent. Sessions that take place at Linford Lakes will have the option of bird watching in place of one activity (pond dipping or bug hunting). ...
... explore the relationships between species and how all things are interdependent. Sessions that take place at Linford Lakes will have the option of bird watching in place of one activity (pond dipping or bug hunting). ...
Ecology - Main Home
... Age structure diagrams (population profiles): graphs showing numbers of people in different age groups in the population ...
... Age structure diagrams (population profiles): graphs showing numbers of people in different age groups in the population ...
Unit 3 Sustainability and Interdependence
... dominant species has a lower species diversity than one with the same species richness but no particularly dominant species. The effects of isolation and area can affect species diversity of habitat islands. Ecosystem Diversity Ecosystem diversity refers to the number of distinct ecosystems within a ...
... dominant species has a lower species diversity than one with the same species richness but no particularly dominant species. The effects of isolation and area can affect species diversity of habitat islands. Ecosystem Diversity Ecosystem diversity refers to the number of distinct ecosystems within a ...
status of biodiversity - ENVIS Centre On Avian Ecology
... extinctions more likely for species with smaller ranges: conservation of restricted-area species is priority reliable estimates of diversity of some easily observable taxa e.g. birds International Council for Bird Preservation: areas containing the breeding ranges of at least 2 restricted-range spec ...
... extinctions more likely for species with smaller ranges: conservation of restricted-area species is priority reliable estimates of diversity of some easily observable taxa e.g. birds International Council for Bird Preservation: areas containing the breeding ranges of at least 2 restricted-range spec ...
Lecture 2: Human Impact - Rainforests and Coral Reefs Wiki
... Ecosystems depend on species interactions ...
... Ecosystems depend on species interactions ...
Natural Capital Degradation: The Nile Perch
... Threatened Marine Species • Why is it hard to protect marine biodiversity? – Human ecological footprint and fishprint are expanding – Much of the damage in the ocean is not visible – The oceans are incorrectly viewed as an inexhaustible ...
... Threatened Marine Species • Why is it hard to protect marine biodiversity? – Human ecological footprint and fishprint are expanding – Much of the damage in the ocean is not visible – The oceans are incorrectly viewed as an inexhaustible ...
learning objectives
... • Ecological islands—habitats separated from the main part of a biome—show the same diversity characteristics as physical islands. The smaller the ecological island and the greater its distance from its “mainland,” the fewer species it can support. ...
... • Ecological islands—habitats separated from the main part of a biome—show the same diversity characteristics as physical islands. The smaller the ecological island and the greater its distance from its “mainland,” the fewer species it can support. ...
Biodiversity
Global Biodiversity is the variety of different types of life found on Earth and the variations within species. It is a measure of the variety of organisms present in different ecosystems. This can refer to genetic variation, ecosystem variation, or species variation (number of species) within an area, biome, or planet. Terrestrial biodiversity tends to be highest near the equator, which seems to be the result of the warm climate and high primary productivity. Biodiversity is not distributed evenly on Earth. It is the richest in the tropics. Marine biodiversity tends to be highest along coasts in the Western Pacific, where sea surface temperature is highest and in the mid-latitudinal band in all oceans. There are latitudinal gradients in species diversity. Biodiversity generally tends to cluster in hotspots, and has been increasing through time but will be likely to slow in the future.The number and variety of plants, animals and other organisms that exist is known as biodiversity. It is an essential component of nature and it ensures the survival of human species by providing food, fuel, shelter, medicines and other resources to mankind. The richness of biodiversity depends on the climatic conditions and area of the region. All species of plants taken together are known as flora and about 70,000 species of plants are known till date. All species of animals taken together are known as fauna which includes birds, mammals, fish, reptiles, insects, crustaceans, molluscs, etc.Rapid environmental changes typically cause mass extinctions. 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. The total amount of related DNA base pairs on Earth is estimated at 5.0 x 1037, and weighs 50 billion tonnes. In comparison, the total mass of the biosphere has been estimated to be as much as 4 TtC (trillion tons of carbon).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. Since life began on Earth, five major mass extinctions and several minor events have led to large and sudden drops in biodiversity. The Phanerozoic eon (the last 540 million years) marked a rapid growth in biodiversity via the Cambrian explosion—a period during which the majority of multicellular phyla first appeared. The next 400 million years included repeated, massive biodiversity losses classified as mass extinction events. In the Carboniferous, rainforest collapse led to a great loss of plant and animal life. The Permian–Triassic extinction event, 251 million years ago, was the worst; vertebrate recovery took 30 million years. The most recent, the Cretaceous–Paleogene extinction event, occurred 65 million years ago and has often attracted more attention than others because it resulted in the extinction of the dinosaurs.The period since the emergence of humans has displayed an ongoing biodiversity reduction and an accompanying loss of genetic diversity. Named the Holocene extinction, the reduction is caused primarily by human impacts, particularly habitat destruction. Conversely, biodiversity impacts human health in a number of ways, both positively and negatively.The United Nations designated 2011–2020 as the United Nations Decade on Biodiversity.