Review Questions Topic 4
... B) Red Lists – produced by the IUCN is a collection of threatened species lists under varying levels of threat to their survival. ...
... B) Red Lists – produced by the IUCN is a collection of threatened species lists under varying levels of threat to their survival. ...
Review Questions Topic 4
... B) Red Lists – produced by the IUCN is a collection of threatened species lists under varying levels of threat to their survival. ...
... B) Red Lists – produced by the IUCN is a collection of threatened species lists under varying levels of threat to their survival. ...
Cornell Chap 3,4 - Santa Rosa Home
... 3. What makes a keystone species and why are they important? 4. How do ecosystems change over time? (discuss succession) 5. What are the problems with invasive species? 6. What factors affect how biomes form? (compare/contrast ones in USA) Cornell Notes Species Interactions ...
... 3. What makes a keystone species and why are they important? 4. How do ecosystems change over time? (discuss succession) 5. What are the problems with invasive species? 6. What factors affect how biomes form? (compare/contrast ones in USA) Cornell Notes Species Interactions ...
Chapter 54 Community Ecology Name: 54.1 Community interactions
... 54.1 Community interactions are classified by whether they help, harm or have no effect on the species involved. 1. What is a community? List six organisms that could be found in your schoolyard community. ...
... 54.1 Community interactions are classified by whether they help, harm or have no effect on the species involved. 1. What is a community? List six organisms that could be found in your schoolyard community. ...
Extinction and Vulnerability to Extinction
... 0.65 % loss per century or 1 bird or mammal species per year • Compared with the historical record for birds and mammals – 0.0003 species per year • Hence, 333 times greater than background rate of extinction ...
... 0.65 % loss per century or 1 bird or mammal species per year • Compared with the historical record for birds and mammals – 0.0003 species per year • Hence, 333 times greater than background rate of extinction ...
Document
... 2. Endangered Species: a species that is on the verge of extinction 3. Extinction: when the last members of a species dies out f. Resource Depletion: overuse of essential resources Pollution, habitat loss g. Human Exploitation: killing, endangering, or over harvesting organisms for human benefit ...
... 2. Endangered Species: a species that is on the verge of extinction 3. Extinction: when the last members of a species dies out f. Resource Depletion: overuse of essential resources Pollution, habitat loss g. Human Exploitation: killing, endangering, or over harvesting organisms for human benefit ...
Stories from the Fossil Record Evidence Chart Key
... The leaf edges tell us if the climate where the plant grew was generally cool or warm. ...
... The leaf edges tell us if the climate where the plant grew was generally cool or warm. ...
Species Diversity
... • Geographic range: local endemics, rare because they only live in one small place • Habitat specialists: Occur in specific and rare habitats, rare because their habitat is rare • Local population size: occur at low densities • Some relatively abundant species very threatened, some rare species have ...
... • Geographic range: local endemics, rare because they only live in one small place • Habitat specialists: Occur in specific and rare habitats, rare because their habitat is rare • Local population size: occur at low densities • Some relatively abundant species very threatened, some rare species have ...
Glossary
... Ecological Value: Vital component of the key ecosystem functions of energy flow, nutrient cycling, and population control. Ecosystem: One or more communities of different species interacting with one another and with the chemical and physical factors making up their non-living environment. Endangere ...
... Ecological Value: Vital component of the key ecosystem functions of energy flow, nutrient cycling, and population control. Ecosystem: One or more communities of different species interacting with one another and with the chemical and physical factors making up their non-living environment. Endangere ...
Chapter 6
... • Evolution of similar forms in two or more different biological groups • Marsupials and placental mammals – Similar form – Isolated, adaptive convergent evolution after initial divergence ...
... • Evolution of similar forms in two or more different biological groups • Marsupials and placental mammals – Similar form – Isolated, adaptive convergent evolution after initial divergence ...
Ch. 54 Community Ecology Reading Guide
... 24. Name one keystone species, and explain the effect its removal has on the ecosystem. 25. Explain facilitator or foundation species and give an example. You may omit bottom-up and top-down controls. 54.3 Disturbance influences species diversity and composition 26. What is the intermediate disturba ...
... 24. Name one keystone species, and explain the effect its removal has on the ecosystem. 25. Explain facilitator or foundation species and give an example. You may omit bottom-up and top-down controls. 54.3 Disturbance influences species diversity and composition 26. What is the intermediate disturba ...
Homework
... Basic unit of biological classification Organisms that resemble each other, that are similar in genetic makeup, chemistry, and behavior, and that are able to interbreed and produce fertile offspring ...
... Basic unit of biological classification Organisms that resemble each other, that are similar in genetic makeup, chemistry, and behavior, and that are able to interbreed and produce fertile offspring ...
Unit 4 powerpoint
... • Adaptation or adaptive trait- any heritable trait that enables an individual to survive • In order for natural selection to occur, a trait must be heritable, meaning that it can be passed down from one generation to another. The trait must also lead to differential reproduction. ...
... • Adaptation or adaptive trait- any heritable trait that enables an individual to survive • In order for natural selection to occur, a trait must be heritable, meaning that it can be passed down from one generation to another. The trait must also lead to differential reproduction. ...
Endangered Species
... Species become extinct or endangered for a number of reasons, but the primary cause is the destruction of habitat. Drainage of wetlands, conversion of shrub lands to grazing lands, cutting and clearing of forests (especially in the Tropics, where the rain forests will be gone by ad 2000 if destructi ...
... Species become extinct or endangered for a number of reasons, but the primary cause is the destruction of habitat. Drainage of wetlands, conversion of shrub lands to grazing lands, cutting and clearing of forests (especially in the Tropics, where the rain forests will be gone by ad 2000 if destructi ...
Biological Diversity & Conservation
... strips that allow the migration of organisms from one area to another. ...
... strips that allow the migration of organisms from one area to another. ...
Ecological effects of habitat fragmentation and edge creation
... matrix. The phenomenon is complex and largely system-specific, but some generalizations about the biological consequences of fragmentation are starting to emerge from research in conservation biology. There is generally an inverse relationship between the number of extinctions in fragments and their ...
... matrix. The phenomenon is complex and largely system-specific, but some generalizations about the biological consequences of fragmentation are starting to emerge from research in conservation biology. There is generally an inverse relationship between the number of extinctions in fragments and their ...
Population
... Ex: several thousand salmon eggs, not all hatch, a few hundred survive disease or predation, several dozen reach adulthood, and few will successfully reproduce ...
... Ex: several thousand salmon eggs, not all hatch, a few hundred survive disease or predation, several dozen reach adulthood, and few will successfully reproduce ...
biodiversity
... biodiversity. More species in an ecosystem means more pathways for energy to flow through the ecosystem. This makes the ecosystem strong. Fewer pathways for energy flow make the ecosystem vulnerable. ...
... biodiversity. More species in an ecosystem means more pathways for energy to flow through the ecosystem. This makes the ecosystem strong. Fewer pathways for energy flow make the ecosystem vulnerable. ...
File
... other members to produce fertile offspring. Allopatric speciation is the most common mechanism and occurs in two phases: a. Geographic isolation: physical separation for long time periods b. Reproductive isolation: the gene pools are so changed that members become so different in genetic makeup that ...
... other members to produce fertile offspring. Allopatric speciation is the most common mechanism and occurs in two phases: a. Geographic isolation: physical separation for long time periods b. Reproductive isolation: the gene pools are so changed that members become so different in genetic makeup that ...
Ch57 quiz-student copy
... the biodiversity crisis. Which of the following does not represent an inadequacy of zoos? a. There is not enough space in existing zoos and botanical gardens to maintain populations of more than a small fraction of rare and endangered species. b. Captive propagation projects in zoos have proven to b ...
... the biodiversity crisis. Which of the following does not represent an inadequacy of zoos? a. There is not enough space in existing zoos and botanical gardens to maintain populations of more than a small fraction of rare and endangered species. b. Captive propagation projects in zoos have proven to b ...
notes
... Biodiversity crisis – in the past 100 years 20 species of ____________ and over 40 species of __________ have gone extinct Growth of __________ population linked to number of extinctions ...
... Biodiversity crisis – in the past 100 years 20 species of ____________ and over 40 species of __________ have gone extinct Growth of __________ population linked to number of extinctions ...
APES Chapter 4 “Biodiversity and Evolution”
... C4L4: How Do Speciation, Extinction, and Human Activities Affect Biodiversity? Concept 4-4A As environmental conditions change, the balance between the formation of new species and the extinction of existing species determines the Earth’s biodiversity. Concept 4-4B Human activities are decreasing b ...
... C4L4: How Do Speciation, Extinction, and Human Activities Affect Biodiversity? Concept 4-4A As environmental conditions change, the balance between the formation of new species and the extinction of existing species determines the Earth’s biodiversity. Concept 4-4B Human activities are decreasing b ...
Document
... Biomagnification causes accumulation of toxins in the food chain. • Pollutants can move up the food chain. – predators eat contaminated prey – pollution accumulates at each stage of the food chain • Top consumers, including humans, are most affected. ...
... Biomagnification causes accumulation of toxins in the food chain. • Pollutants can move up the food chain. – predators eat contaminated prey – pollution accumulates at each stage of the food chain • Top consumers, including humans, are most affected. ...
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.