Critical Factors and Tolerance Limits Adaptation
... preventing genetic exchange, can result in branching off of new species that coexist with the parental line. ...
... preventing genetic exchange, can result in branching off of new species that coexist with the parental line. ...
Unit 2 ecosystem study sheet
... Nonnative (exotic) species (Biological Pollution) 49% of all US endangered species are caused by nonnative species many introduced species have no natural predators, competitors, or pathogens to control numbers ex. Kudzu vine(SE US for erosion control), Brown Tree Snake (kills birds in Guam) Zeb ...
... Nonnative (exotic) species (Biological Pollution) 49% of all US endangered species are caused by nonnative species many introduced species have no natural predators, competitors, or pathogens to control numbers ex. Kudzu vine(SE US for erosion control), Brown Tree Snake (kills birds in Guam) Zeb ...
How Introduced Species Affect Ecosystems
... - compete against native species for resources (food, habitat) Ex: Florida wasp became extinct a few years after the southeast Asian wasp became established. ...
... - compete against native species for resources (food, habitat) Ex: Florida wasp became extinct a few years after the southeast Asian wasp became established. ...
Biodiversity at Risk
... As human populations grow, we use more land to build homes and harvest resources. In the process, we destroy and fragment the habitats of other species. It is estimated that habitat loss causes almost 75 percent of the extinctions now occurring. Ex. Florida Panther ...
... As human populations grow, we use more land to build homes and harvest resources. In the process, we destroy and fragment the habitats of other species. It is estimated that habitat loss causes almost 75 percent of the extinctions now occurring. Ex. Florida Panther ...
Document
... able to live on and reproduce. Thereby increasing desirable gene traits in their offspring ...
... able to live on and reproduce. Thereby increasing desirable gene traits in their offspring ...
Endangered Species - Ms. Anderson`s Room 280
... day hunting regulations minimize over-harvesting of wildlife. ...
... day hunting regulations minimize over-harvesting of wildlife. ...
Rare and threatened species of the Macquarie Harbour region
... Vulnerable. A species is listed as vulnerable when it is not endangered but is facing a high risk of extinction in the medium-term future. Species in this listing may: • number less than 1000 mature individuals, or; • have suffered a decline in numbers of 50% over the last 20 years. Additionally, ra ...
... Vulnerable. A species is listed as vulnerable when it is not endangered but is facing a high risk of extinction in the medium-term future. Species in this listing may: • number less than 1000 mature individuals, or; • have suffered a decline in numbers of 50% over the last 20 years. Additionally, ra ...
FINAL EXAM WILL COVER - San Diego Mesa College
... How does San Diego County compare to other counties in the US in terms of number of federally listed endangered animal and plant species? Why? How does the US compare to other countries in terms of total energy consumption? In terms of per capita energy consumption? How is erosion related to defores ...
... How does San Diego County compare to other counties in the US in terms of number of federally listed endangered animal and plant species? Why? How does the US compare to other countries in terms of total energy consumption? In terms of per capita energy consumption? How is erosion related to defores ...
Conserving Populations (week 11)
... True introductions, reintroductions, augmentation Limited dispersal powers & fragmented habitats High population increase rate Not good for mammals and birds High genetic diversity Best at historical core range Invertebrates ...
... True introductions, reintroductions, augmentation Limited dispersal powers & fragmented habitats High population increase rate Not good for mammals and birds High genetic diversity Best at historical core range Invertebrates ...
Ch. 3 Reading questions 1. What is an ecosystem and
... 4. What characteristic are used to distinguish between terrestrial biomes? 5. What characteristics of a terrestrial biome determine its productivity? 6. Why are aquatic biomes categorized differently than terrestrial biomes? 7. What are the different zones of lakes and the open ocean? What defines t ...
... 4. What characteristic are used to distinguish between terrestrial biomes? 5. What characteristics of a terrestrial biome determine its productivity? 6. Why are aquatic biomes categorized differently than terrestrial biomes? 7. What are the different zones of lakes and the open ocean? What defines t ...
Science 7: Unit A – Interactions and Ecosystems
... An introduced species is one that is brought to a new ecosystem with humans. Often introduced species do damage to the ecosystem by harming the organisms there. Eg. Settlers brought rabbits with them to Australia. The rabbits escaped into the wild, and without predators in Australia, began to gr ...
... An introduced species is one that is brought to a new ecosystem with humans. Often introduced species do damage to the ecosystem by harming the organisms there. Eg. Settlers brought rabbits with them to Australia. The rabbits escaped into the wild, and without predators in Australia, began to gr ...
Relating Foraging Behavior to Wildlife Management
... Environmental Stochasticity – random series of environmental changes that affect all members of a population similarly – a couple of bad years in a row can be especially devastating to rare populations • El Nino and Alala – Poor reproduction, even in captivity – Compounding effect of predators (Io ...
... Environmental Stochasticity – random series of environmental changes that affect all members of a population similarly – a couple of bad years in a row can be especially devastating to rare populations • El Nino and Alala – Poor reproduction, even in captivity – Compounding effect of predators (Io ...
Relating Foraging Behavior to Wildlife Management
... – Using 10 million, there are 5 million in tropical forests – 2% of tropical forests are disappearing annually – Translates into 27,000 species / year or 75 per day going extinct in tropical forests alone (Wilson 1992) – This present rate is 10,000x greater than background rate through geologic time ...
... – Using 10 million, there are 5 million in tropical forests – 2% of tropical forests are disappearing annually – Translates into 27,000 species / year or 75 per day going extinct in tropical forests alone (Wilson 1992) – This present rate is 10,000x greater than background rate through geologic time ...
Review PPT
... a. the greatest number of niches possible in a given area b. always the same for a given habitat c. the average number of offspring carried to term by a species d. the maximum population size that a given environment can sustain e. the potential number of species in a ...
... a. the greatest number of niches possible in a given area b. always the same for a given habitat c. the average number of offspring carried to term by a species d. the maximum population size that a given environment can sustain e. the potential number of species in a ...
Evolution
... Mass Extinction means that MOST, but NOT ALL species went extinct during a short time period. Because of GREAT BIOLOGICAL DIVERSITY before a catastrophic event, some individuals of some species survive the event. ...
... Mass Extinction means that MOST, but NOT ALL species went extinct during a short time period. Because of GREAT BIOLOGICAL DIVERSITY before a catastrophic event, some individuals of some species survive the event. ...
Biodiversity
... Some people believe that we should preserve biodiversity for ethical reasons. Species and ecosystems have a right to exist whether or not they have any other value. Each organisms is a gift with a higher purpose. ...
... Some people believe that we should preserve biodiversity for ethical reasons. Species and ecosystems have a right to exist whether or not they have any other value. Each organisms is a gift with a higher purpose. ...
16.4 Threats To Biodiversity
... Preserving biodiversity is important to the future of the biosphere. • Why biodiversity is important: – loss of medical and technological advances – extinction of species – loss of ecosystem stability ...
... Preserving biodiversity is important to the future of the biosphere. • Why biodiversity is important: – loss of medical and technological advances – extinction of species – loss of ecosystem stability ...
extinct
... (1) Resistance- degree of resistance to perturbation (2) Resiliency after change- capability for returning quickly to the original (pre-perturbed state); I.e. successional restoration (3) Susceptibility- likelihood of perturbance Ecosystems, communities, populations-- which have more or less of the ...
... (1) Resistance- degree of resistance to perturbation (2) Resiliency after change- capability for returning quickly to the original (pre-perturbed state); I.e. successional restoration (3) Susceptibility- likelihood of perturbance Ecosystems, communities, populations-- which have more or less of the ...
Competition Competitive exclusion principle
... • Pathogen A parasite that causes disease in its host. • A single parasite rarely causes the death of its host. ...
... • Pathogen A parasite that causes disease in its host. • A single parasite rarely causes the death of its host. ...
Slide 1
... Endangered Species • An endangered species is a population of an organism which is at risk of becoming extinct because it is either few in number, or threatened by changing environmental or predation parameters. ...
... Endangered Species • An endangered species is a population of an organism which is at risk of becoming extinct because it is either few in number, or threatened by changing environmental or predation parameters. ...
The Emergence of Complex Life
... explain the demise of so many different types of dinosaurs. The explanations generally fall into two main categories: 1) changes in the physical environment, and 2) the appearance of biologically superior life forms (eg, more effective predators, better competitors). ...
... explain the demise of so many different types of dinosaurs. The explanations generally fall into two main categories: 1) changes in the physical environment, and 2) the appearance of biologically superior life forms (eg, more effective predators, better competitors). ...
The Value of Endangered Species: the Importance of Conserving
... area is termed its “biological diversity.” The term biological diversity is often used interchangeably (sometimes confusingly) with two other terms, “genetic diversity” and “ecological diversity.” Genetic diversity (amount of genetic variability among individuals of the same species) and ecological ...
... area is termed its “biological diversity.” The term biological diversity is often used interchangeably (sometimes confusingly) with two other terms, “genetic diversity” and “ecological diversity.” Genetic diversity (amount of genetic variability among individuals of the same species) and ecological ...
CONSERVATION496.5 KB
... in situ and ex situ methods of maintaining biodiversity In situ conservation including marine conservation zones and wildlife reserves • ex situ conservation including seed banks, botanic gardens and zoos. ...
... in situ and ex situ methods of maintaining biodiversity In situ conservation including marine conservation zones and wildlife reserves • ex situ conservation including seed banks, botanic gardens and zoos. ...
Chapter 22 - Humans and the Environment
... • There are specific species in many different ecosystems that can be used to determine the health of the ecosystem. These species are called bioindicators. – An example of this for our ecosystem are frog species. Their skin is highly permeable making them very susceptible to environmental contamina ...
... • There are specific species in many different ecosystems that can be used to determine the health of the ecosystem. These species are called bioindicators. – An example of this for our ecosystem are frog species. Their skin is highly permeable making them very susceptible to environmental contamina ...
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.