Biodiversity
... • Tropical rain forests: cover ~7% of the earth, but they have ~1/2 of life. • coral reefs: contain the majority of the ocean’s biodiversity, ~60% of them are threatened by people • Biodiversity hotspots: 25 areas have been labeled as “hotspots” because they are the most threatened areas.Ex: ...
... • Tropical rain forests: cover ~7% of the earth, but they have ~1/2 of life. • coral reefs: contain the majority of the ocean’s biodiversity, ~60% of them are threatened by people • Biodiversity hotspots: 25 areas have been labeled as “hotspots” because they are the most threatened areas.Ex: ...
OVERVIEW BIODIVERSITY BACKGROUND Biological Diversity
... often what is meant when the term biodiversity is used. Species diversity is the remarkable variety of species of living things – plants, animals, fungi, and microorganisms. It is not known how many different species there are on earth. Over 1.4 million have been identified, and millions have yet to ...
... often what is meant when the term biodiversity is used. Species diversity is the remarkable variety of species of living things – plants, animals, fungi, and microorganisms. It is not known how many different species there are on earth. Over 1.4 million have been identified, and millions have yet to ...
BIODIVERSITY & ENDANGERED SPECIES
... Monteverde cloud forest has become extinct because of changes in climate. ...
... Monteverde cloud forest has become extinct because of changes in climate. ...
Chapter 8
... Most offspring die before reaching reproductive age Small adults Adapted to unstable climate and environmental conditions High population growth rate (r) Population size fluctuates wildly above and below carrying capacity (K) Generalist niche Low ability to compete Early successional species Fig. 8- ...
... Most offspring die before reaching reproductive age Small adults Adapted to unstable climate and environmental conditions High population growth rate (r) Population size fluctuates wildly above and below carrying capacity (K) Generalist niche Low ability to compete Early successional species Fig. 8- ...
Speciation and Extinction
... • All species eventually go extinct • Over 99.9% of all species that have existed are ...
... • All species eventually go extinct • Over 99.9% of all species that have existed are ...
ReWilding North America
... to most US National Parks. So an proxies for extinct large vertebrates. b, Conservation value and understanding of ecological and ecological role (interactivity with other species) on the landscape. evolutionary history, inspired by c, Potential economic/cultural value versus potential conflict. vis ...
... to most US National Parks. So an proxies for extinct large vertebrates. b, Conservation value and understanding of ecological and ecological role (interactivity with other species) on the landscape. evolutionary history, inspired by c, Potential economic/cultural value versus potential conflict. vis ...
Ch. 6 Population and Community Ecology
... • N is the total number of individuals within a defined area at a given time • Density dependent factors influence an individual’s probability of survival and reproduction in a manner that depend on the size of the population. Ex: amount of available food (is a limiting resource) • K is the carrying ...
... • N is the total number of individuals within a defined area at a given time • Density dependent factors influence an individual’s probability of survival and reproduction in a manner that depend on the size of the population. Ex: amount of available food (is a limiting resource) • K is the carrying ...
Document
... • If the activities are minor in scope and effect, the submitted HCP is considered one of low effect and receives expedited permit processing • When FWS makes an incidental take permit decision, it publishes a notice in the Federal Register, and calls for public comment ...
... • If the activities are minor in scope and effect, the submitted HCP is considered one of low effect and receives expedited permit processing • When FWS makes an incidental take permit decision, it publishes a notice in the Federal Register, and calls for public comment ...
Measuring Biodiversity
... Peloncillo Mts., west of the Rio Grande in New Mexico near the Arizona border. The skull on the right is from the Franklin Mts. of Texas, east of the Rio Grande. Molecular evidence now indicates that these are two separate species despite the great morphological ...
... Peloncillo Mts., west of the Rio Grande in New Mexico near the Arizona border. The skull on the right is from the Franklin Mts. of Texas, east of the Rio Grande. Molecular evidence now indicates that these are two separate species despite the great morphological ...
Warm up # 21
... national park is 90% grey and 10% black, consistent with the wolf population in other regions. After several generations in isolation, the national park’s wolf population is 60% grey and 40% black. The wolf population has likely experienced A. natural selection. B. genetic drift. C. mutations. D. mi ...
... national park is 90% grey and 10% black, consistent with the wolf population in other regions. After several generations in isolation, the national park’s wolf population is 60% grey and 40% black. The wolf population has likely experienced A. natural selection. B. genetic drift. C. mutations. D. mi ...
SF Ev L3 Fossils
... identical fossils. They tell themselves apart by song. Fossils will not record their speciation event until they become different enough that it shows in the bones, e.g. one gets bigger than the other Chiff Chaff ...
... identical fossils. They tell themselves apart by song. Fossils will not record their speciation event until they become different enough that it shows in the bones, e.g. one gets bigger than the other Chiff Chaff ...
From populations to communities
... limiting factor unpredictability in space and time when a resident dies or is killed ...
... limiting factor unpredictability in space and time when a resident dies or is killed ...
Human Impact on Resources and Ecosystems
... Migration Routes for North American Waterfowl Migratory waterfowl follow traditional routes when they migrate. These have become known as the Atlantic, Mississippi, Central, and Pacific flyways. Many of these waterfowl are hatched in Canada, migrate through the United States, and winter in the sout ...
... Migration Routes for North American Waterfowl Migratory waterfowl follow traditional routes when they migrate. These have become known as the Atlantic, Mississippi, Central, and Pacific flyways. Many of these waterfowl are hatched in Canada, migrate through the United States, and winter in the sout ...
Why are we still so unsure of the number of species on Earth?
... Biodiversity loss and species extinction • Extinction = last member of a species dies and the species vanishes forever from Earth • Extirpation = disappearance of a particular population, but not the entire species globally • These are natural processes. On average one species goes extinct naturally ...
... Biodiversity loss and species extinction • Extinction = last member of a species dies and the species vanishes forever from Earth • Extirpation = disappearance of a particular population, but not the entire species globally • These are natural processes. On average one species goes extinct naturally ...
Evolution
... between a species/population be enough to prevent gene flow? Why? • 2. Would pre-zygotic or post-zygotic RIM have the best chance of preventing hybrids? • 3. Which forms of RIM would most likely ...
... between a species/population be enough to prevent gene flow? Why? • 2. Would pre-zygotic or post-zygotic RIM have the best chance of preventing hybrids? • 3. Which forms of RIM would most likely ...
Genetic diversity - THE GEOGRAPHER ONLINE
... 2. All the giraffes have competition for resources (food and space) 3. This competition would lead to the death of some individuals (mainly shorter necked ones, as their food is also eaten by all the other short necked animals). Whereas others would survive (the longer necked ones have an advantage ...
... 2. All the giraffes have competition for resources (food and space) 3. This competition would lead to the death of some individuals (mainly shorter necked ones, as their food is also eaten by all the other short necked animals). Whereas others would survive (the longer necked ones have an advantage ...
Biodiversity Trail
... Biodiversity refers to the variety of all living organisms, from microscopic bacteria to giant redwood trees. It includes the variety of genetic information available within a species. The interrelationships between organisms are also an integral part of biodiversity. Organisms have evolved over tim ...
... Biodiversity refers to the variety of all living organisms, from microscopic bacteria to giant redwood trees. It includes the variety of genetic information available within a species. The interrelationships between organisms are also an integral part of biodiversity. Organisms have evolved over tim ...
competitive exclusion principle
... A species' niche is the range of environmental conditions under which it can persist. More formally, the niche includes how a population responds to the abundance of its resources and enemies (e. g., by growing when resources are abundant, and predators, parasites and pathogens are scarce) and how i ...
... A species' niche is the range of environmental conditions under which it can persist. More formally, the niche includes how a population responds to the abundance of its resources and enemies (e. g., by growing when resources are abundant, and predators, parasites and pathogens are scarce) and how i ...
Human Influences on Ecosystems
... species have been tested for pharmaceutical use, but 40% of drugs derived from plants ...
... species have been tested for pharmaceutical use, but 40% of drugs derived from plants ...
Lab #3 Biodiversity Index Diversity Index
... than half their average life spans to individuals that are younger than half their average life spans for each species ∗ Species rarity which would be represented by a multiplier based on how threatened it is with extinction ...
... than half their average life spans to individuals that are younger than half their average life spans for each species ∗ Species rarity which would be represented by a multiplier based on how threatened it is with extinction ...
LESSON 1 Defining biodiversity
... are necessary for it to adapt and survive. A species that has a large degree of genetic diversity among its population will have more variations from which to choose the most fit genes. Species that have very little genetic variation are at a great risk. With very little gene variation within the sp ...
... are necessary for it to adapt and survive. A species that has a large degree of genetic diversity among its population will have more variations from which to choose the most fit genes. Species that have very little genetic variation are at a great risk. With very little gene variation within the sp ...
Exam 4 Material Outline MS Word
... 4. What mechanisms brought about the ability for adults to digest milk in three different regions? ...
... 4. What mechanisms brought about the ability for adults to digest milk in three different regions? ...
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.