Plant of the Day
... • Van Walen saw evidence for this through his observation of what he called the ‘law of constant extinction’: species or genera were as likely to become extinct at one time as at any other, irrespective of their geological age – Paleontologists did not like that – Other studies showed that extinctio ...
... • Van Walen saw evidence for this through his observation of what he called the ‘law of constant extinction’: species or genera were as likely to become extinct at one time as at any other, irrespective of their geological age – Paleontologists did not like that – Other studies showed that extinctio ...
final slideshow
... ◦ Species usually only last 1-10 million years. ◦ Life has had to cope with natural disasters that have eliminated species. ◦ Introduction of new species can lead to the extinction of another. ...
... ◦ Species usually only last 1-10 million years. ◦ Life has had to cope with natural disasters that have eliminated species. ◦ Introduction of new species can lead to the extinction of another. ...
Unit 7 Biodiversity PowerPoint
... Naturally occurring extinctions, occurring one species at a time • Mass extinctions: Events when extinction rates far exceed the normal background rate • There have been five mass extinctions in Earth’s history. • Each time, more than 1/5 of all families and 1/2 of all species have gone extinct. ...
... Naturally occurring extinctions, occurring one species at a time • Mass extinctions: Events when extinction rates far exceed the normal background rate • There have been five mass extinctions in Earth’s history. • Each time, more than 1/5 of all families and 1/2 of all species have gone extinct. ...
ppt檔案
... The history of life has been punctuated by five episodes during which extinction rates were very high. If extinction is a normal process, and if life has rediversified after each mass extinction, why should we be worried about the prospects of high extinction rates during this century? How does the ...
... The history of life has been punctuated by five episodes during which extinction rates were very high. If extinction is a normal process, and if life has rediversified after each mass extinction, why should we be worried about the prospects of high extinction rates during this century? How does the ...
Chapter Outline
... 3. One surprise has been the discovery that rain forest canopies and the deepsea benthos have many more species than formerly thought. 41.2 The direct value of biodiversity is becoming better recognized A. Conservation biology strives to reverse the trend towards the possible extinction of tens of t ...
... 3. One surprise has been the discovery that rain forest canopies and the deepsea benthos have many more species than formerly thought. 41.2 The direct value of biodiversity is becoming better recognized A. Conservation biology strives to reverse the trend towards the possible extinction of tens of t ...
Summer Quiz #1 - Plain Local Schools
... 1. Under which of the following circumstances would interspecific competition be most obvious? A. when resources are most abundant B. in the presence of a keystone species C. when organisms have quite different ecological niches D. among species whose trophic levels are different E. when a non-nativ ...
... 1. Under which of the following circumstances would interspecific competition be most obvious? A. when resources are most abundant B. in the presence of a keystone species C. when organisms have quite different ecological niches D. among species whose trophic levels are different E. when a non-nativ ...
INVASIVE SPECIES - Department of Zoology, UBC
... Determinants of invasion What makes a habitat more or less invasible? - Climatic match to tolerances of invaders - Empty niches (islands) - Lack of enemies of invaders ...
... Determinants of invasion What makes a habitat more or less invasible? - Climatic match to tolerances of invaders - Empty niches (islands) - Lack of enemies of invaders ...
What is an Invasive Species?
... invasive species from our list on the board. • Develop an invasive species profile using good sources of information. Must include: • An image or drawing of the invasive species • How it was introduced (and when, if possible) • What species or resources it threatens • A reason it is biologically suc ...
... invasive species from our list on the board. • Develop an invasive species profile using good sources of information. Must include: • An image or drawing of the invasive species • How it was introduced (and when, if possible) • What species or resources it threatens • A reason it is biologically suc ...
Learning Objectives Upon completion of this lesson, the student will
... 1. What is hybridization and what types of organisms use this technique? 2. What is horizontal gene transfer and what types of organisms use this technique? 5. Limits on Adaptation through Natural Selection 1. Identify 2 reasons why we will not be able to adapt to pollutants in the near future. 6. C ...
... 1. What is hybridization and what types of organisms use this technique? 2. What is horizontal gene transfer and what types of organisms use this technique? 5. Limits on Adaptation through Natural Selection 1. Identify 2 reasons why we will not be able to adapt to pollutants in the near future. 6. C ...
Slide
... phases of ice age. 2.) human radiation (immigration)? Problems? a.) Calculations show not enough humans to cause the problem. EXPLANATION: Ok then what if they decreased another keystone species? ...
... phases of ice age. 2.) human radiation (immigration)? Problems? a.) Calculations show not enough humans to cause the problem. EXPLANATION: Ok then what if they decreased another keystone species? ...
CH05 IM
... the species becomes extinct. 1. A species manages to survive one to ten million years before extinction occurs. 2. Life has had to cope with many major natural disasters that may reduce or eliminate species. 3. Introduction of new species into an area has also led to reduction in number or eliminati ...
... the species becomes extinct. 1. A species manages to survive one to ten million years before extinction occurs. 2. Life has had to cope with many major natural disasters that may reduce or eliminate species. 3. Introduction of new species into an area has also led to reduction in number or eliminati ...
Evolution and Populations
... from simple ones – Life evolved large sizes from small ones – But natural selection can also favor simplicity and small size ...
... from simple ones – Life evolved large sizes from small ones – But natural selection can also favor simplicity and small size ...
Invasive Species - Honors PowerPoint Invasive_species
... Working with your neighbor, share information on species you discovered while doing your homework from last night. Brainstorm a list of characteristics that invasive species must generally have in order to “do better” than native species ...
... Working with your neighbor, share information on species you discovered while doing your homework from last night. Brainstorm a list of characteristics that invasive species must generally have in order to “do better” than native species ...
Name: ___________ _________________ Date: ______ Period
... Types of symbiosis: mutualism, commensalism, predation, parasitism, competition The effect of removing a dominant or keystone species Unit 12, Part 3 Notes: Population Ecology 3. Populations Population Growth A. density dependent limiting factors (competition for resources, parasites & disease ...
... Types of symbiosis: mutualism, commensalism, predation, parasitism, competition The effect of removing a dominant or keystone species Unit 12, Part 3 Notes: Population Ecology 3. Populations Population Growth A. density dependent limiting factors (competition for resources, parasites & disease ...
Full PDF Report... - The Rewilding Institute
... The First Wave, the Spread of Modern Humans, ran from 40,000 to about 3,500 years ago as skilled big game hunters first entered lands where Homo sapiens had not previously existed. It continued from 3,000 years ago until 200 years ago, as Stone Age farmers found previously unpeopled islands in the P ...
... The First Wave, the Spread of Modern Humans, ran from 40,000 to about 3,500 years ago as skilled big game hunters first entered lands where Homo sapiens had not previously existed. It continued from 3,000 years ago until 200 years ago, as Stone Age farmers found previously unpeopled islands in the P ...
Biomes and Biodiversity
... – There will be more types of trees on 100 acres than there will be on 1 acre ...
... – There will be more types of trees on 100 acres than there will be on 1 acre ...
Biomes and Biodiversity
... – There will be more types of trees on 100 acres than there will be on 1 acre ...
... – There will be more types of trees on 100 acres than there will be on 1 acre ...
Chapter5- Evolution, Biodiversity, and Population
... Evolution: the source of Earth’s biodiversity • Biological evolution genetic change in populations of organisms across generations (change over time) • May be random or directed by natural selection - Natural Selection the process by which traits that enhance survival and reproduction are passe ...
... Evolution: the source of Earth’s biodiversity • Biological evolution genetic change in populations of organisms across generations (change over time) • May be random or directed by natural selection - Natural Selection the process by which traits that enhance survival and reproduction are passe ...
Evolutionary Patterns Guided Notes
... Punctuation Model of Speciation This model holds that many morphological changes happen during ________________________________________________, followed by long periods of ________________. The fossil record shows that stability prevails for all but 1% of the history of most species, followed ...
... Punctuation Model of Speciation This model holds that many morphological changes happen during ________________________________________________, followed by long periods of ________________. The fossil record shows that stability prevails for all but 1% of the history of most species, followed ...
Aquatic biodiversity and conservation
... Exotic species - non-native plant or animal deliberately or accidentally introduced into a new habitat ...
... Exotic species - non-native plant or animal deliberately or accidentally introduced into a new habitat ...
CHAPTER 13: EVOLUTION AND NATURAL SELECTION → Lecture
... How did the evolution of a vascular system (xylem and phloem) allow plants to better adapt to life on land? Insects make up 75% of the animal kingdom. Why are insects so successful? Population growth occurs when birth rates exceed death rates. Give an example of how density dependence can affect bir ...
... How did the evolution of a vascular system (xylem and phloem) allow plants to better adapt to life on land? Insects make up 75% of the animal kingdom. Why are insects so successful? Population growth occurs when birth rates exceed death rates. Give an example of how density dependence can affect bir ...
What determines where particular species live and how many of
... • Rabbits and Prickly Pear cactus – Australia • Hedgehogs – Outer Hebrides • Rats – New Zealand ...
... • Rabbits and Prickly Pear cactus – Australia • Hedgehogs – Outer Hebrides • Rats – New Zealand ...
Chapter 22 Descent With Modification
... A. A few individuals become isolated from population B. The new population has different allele frequencies than the main population ...
... A. A few individuals become isolated from population B. The new population has different allele frequencies than the main population ...
Biodiversity
... Each living species plays a role and serves a purpose in an ecosystem. The more species that exist, the more secure an ecosystem will be (in general) ...
... Each living species plays a role and serves a purpose in an ecosystem. The more species that exist, the more secure an ecosystem will be (in general) ...
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.