• Study Resource
  • Explore
    • Arts & Humanities
    • Business
    • Engineering & Technology
    • Foreign Language
    • History
    • Math
    • Science
    • Social Science

    Top subcategories

    • Advanced Math
    • Algebra
    • Basic Math
    • Calculus
    • Geometry
    • Linear Algebra
    • Pre-Algebra
    • Pre-Calculus
    • Statistics And Probability
    • Trigonometry
    • other →

    Top subcategories

    • Astronomy
    • Astrophysics
    • Biology
    • Chemistry
    • Earth Science
    • Environmental Science
    • Health Science
    • Physics
    • other →

    Top subcategories

    • Anthropology
    • Law
    • Political Science
    • Psychology
    • Sociology
    • other →

    Top subcategories

    • Accounting
    • Economics
    • Finance
    • Management
    • other →

    Top subcategories

    • Aerospace Engineering
    • Bioengineering
    • Chemical Engineering
    • Civil Engineering
    • Computer Science
    • Electrical Engineering
    • Industrial Engineering
    • Mechanical Engineering
    • Web Design
    • other →

    Top subcategories

    • Architecture
    • Communications
    • English
    • Gender Studies
    • Music
    • Performing Arts
    • Philosophy
    • Religious Studies
    • Writing
    • other →

    Top subcategories

    • Ancient History
    • European History
    • US History
    • World History
    • other →

    Top subcategories

    • Croatian
    • Czech
    • Finnish
    • Greek
    • Hindi
    • Japanese
    • Korean
    • Persian
    • Swedish
    • Turkish
    • other →
 
Profile Documents Logout
Upload
New_Hotspots of Biodiversity
New_Hotspots of Biodiversity

... Species which have small populations in the world and are confined to limited areas or are thinly distributed over a more wide area. E.g. Asiatic Pheasants, Satyr Tragopan, Temminick Tragopan. ...
6. Community Ecology new
6. Community Ecology new

... • Edges can fragment habitat  vulnerability & barriers ...
Biodiversity Station Key
Biodiversity Station Key

... 1. This genetic deformity will affect their success of the pack because they may not be able to hunt or maybe other predators will see this as a weakness. 2. The genetic diversity will increase in the gene pool because they are mating with other wolves, and this will decrease the chance of getting t ...
Species Diversity - edventure-GA
Species Diversity - edventure-GA

... distinguishing features of each species. Tranquilize one representative of each species and trace its body outline on the thoughtfully provided taxonomy paper. We will assume that the most frequently occurring 4 species are the indigenous ones, and any others are just passing through. Sometimes gene ...
Biogeography
Biogeography

... see any region as one large continuous area full of suitable habitat.  In contrast, specialist species that have very narrow niches will see the same area as divided into many distinct habitats, only some of which they can occupy ...
Biodiversity
Biodiversity

... Biodiversity has increased over time, but mass extinctions are also natural events (5 major events) How do we get this data? ...
CONSERVATION BIOLOGY
CONSERVATION BIOLOGY

... • They are able to establish populations in the wild. • They lack natural predators, competitors or pathogens in the new place. • They often have “boom and bust” population dynamics. • Currently more than 4,500 exotic species in U.S. • They are arriving at a high rate due to accelerated trade and tr ...
Indirect commensalism promotes persistence of secondary
Indirect commensalism promotes persistence of secondary

... there is little empirical evidence for secondary extinctions being caused by the loss of positive indirect interactions following a primary extinction, despite evidence that indirect interactions play a dominant role in structuring ecological communities [12]. Species at higher trophic levels (carni ...
Biodiversity
Biodiversity

... Which areas are likely to have high biodiversity? ...
Indirect commensalism promotes persistence of secondary consumer
Indirect commensalism promotes persistence of secondary consumer

... there is little empirical evidence for secondary extinctions being caused by the loss of positive indirect interactions following a primary extinction, despite evidence that indirect interactions play a dominant role in structuring ecological communities [12]. Species at higher trophic levels (carni ...
A PENGUIN SPECIES EXTINCT 500 YEARS AGO
A PENGUIN SPECIES EXTINCT 500 YEARS AGO

... - the distinctive look that gives the yellow-eyed penguin its name - how long it takes for chicks to get their full adult plumage - name of hoiho refers to - what the Maori - the life span of the hoiho and the average size/weight of the birds - what both the marine and land habitats p ...
full text pdf
full text pdf

... We have domesticated landscapes and ecosystems causing unforeseen changes in ecosystem attributes. Humanity has already overshot global biocapacity by 50% and now lives unsustainabily by depleting stocks of natural capital. Three the Earth-system processes - climate change, rate of biodiversity loss ...
chapter 6 - Lisle CUSD 202
chapter 6 - Lisle CUSD 202

... A. Processes such as the shifting of tectonic plates, volcanic eruptions, and earthquakes influence earth’s climate and in turn affect evolution by removing and/or isolating habitats and species. B. Long-term climate changes relocate ecosystems, thus determining where certain species can live. C. As ...
Water Resources
Water Resources

... • Populations may become different enough that they can no longer mate with each other; speciation has occurred ...
CH07_SU04
CH07_SU04

... vegetation or tree partitioning by various animal species such as finches. Spatial patterns – populations dispersed randomly, clumped or uniformly. Biodiversity Abundance - the number of individuals of a species in an area Richness - the number of different species in an area which is a useful measu ...
Evolution
Evolution

... speciation events can range from 4,000 years (some cichlids) to 40,000,000 years (some beetles), with an average of 6,500,000 years ...
Evolution & Biodiversity: Origins, Niches, Adaptation
Evolution & Biodiversity: Origins, Niches, Adaptation

... • Reproductive isolation – evolutionary changes in each population that prevent interbreeding when populations come into contact. © Brooks/Cole Publishing Company / ITP ...
No Slide Title - Model High School
No Slide Title - Model High School

... • Scientists are warning that we are in the midst of another mass extinction. ...
Section 2
Section 2

... • Scientists are warning that we are in the midst of another mass extinction. ...
Biodiversity is life Biodiversity is our life
Biodiversity is life Biodiversity is our life

... clearing land and are often prevented from doing so by the Endangered Species Act. • People who work in construction or who would have benefited from the jobs become upset about the loss of jobs/income. • Most controversies end in compromise, where the needs of the community and the needs of the env ...
Chapter 5 Notes
Chapter 5 Notes

... Organisms are connected by food webs and common needs. ...
Adaptations, Biodiversity, Population CQs
Adaptations, Biodiversity, Population CQs

... Extinction rates are…? a. Greater than immigration rates on small islands b. Greater on large islands than small islands ...
Populations
Populations

...  Mutualism and commensalism are two types of symbiotic relationships in which one or both of the species benefit. ...
File - Groby Bio Page
File - Groby Bio Page

... Prepare notes on this topic based on the requirements of the specification (h)(i) the principles of artificial selection and its uses To include examples of selective breeding in plants and animals AND an appreciation of the importance of maintaining a resource of genetic material for use in selecti ...
Ecology Drives the Worldwide Distribution of
Ecology Drives the Worldwide Distribution of

... world, there lower the number of animal and plant species that exist. This pattern is referred to as the latitudinal species diversity gradient. There are many theories to explain this. Foremost of the theories are three: area, energy, and time. Based on the curvature of the earth there is more land ...
< 1 ... 50 51 52 53 54 55 56 57 58 ... 108 >

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.
  • studyres.com © 2025
  • DMCA
  • Privacy
  • Terms
  • Report