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Topic: Adaptive radiation


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In the News (Thu 18 Apr 19)

  
  Adaptive radiation - Wikipedia, the free encyclopedia
Adaptive radiation often occurs when a species is introduced to a new ecosystem, or when a species can survive in an environment that was unreachable before.
An example of adaptive radiation as the result of an environmental change is the rapid spread and development of mammalian species after the extinction of the dinosaurs.
Darwin's finches are examples of adaptive radiation occurring in an archipelago.
en.wikipedia.org /wiki/Adaptive_radiation   (398 words)

  
 "Adaptive Radiation"   (Site not responding. Last check: 2007-11-07)
Adaptive radiation is "evolutionary divergence of members of a single phyletic line into a series of rather different niches or adaptive zones" (Mayer).
Adaptive radiation is considered to be a rapid process, where adaptation into many lineages from a recent common ancestor takes place almost simultaneously.
Adaptive radiation occurs with some combination of new adaptations of an organism combined with the environment that is available.
www.bio.miami.edu /tom/bil160/bil160goods/06_adaptive.html   (1244 words)

  
 Endangered Species Bulletin: "Radiating" Plants - adaptive radiation   (Site not responding. Last check: 2007-11-07)
Adaptive radiation of Hawaiian species has been aided by the isolation of the archipelago and by its distinctive geological origin from a "hot spot" in the Earth's mantle beneath the Pacific tectonic plate.
A premier example of adaptive radiation in plants is the Hawaiian silversword alliance, an endemic lineage in the sunflower family (Asteraceae).
The Hawaiian flora is replete with examples of adaptive radiation, including plants in the poinsettia family (Euphorbiaceae) that evolved into trees (Chamaesyce) and plants in the lobelia family (Campanulaceae) that evolved into 40-foot (12-m) tall palm-like trees (Cyanea and related genera).
www.findarticles.com /p/articles/mi_m0ASV/is_6_23/ai_54061817   (1413 words)

  
 Adaptive Radiation - EvoWiki   (Site not responding. Last check: 2007-11-07)
Adaptive Radiation is the process by which a population diversifies to fill several open niches.
A familiar example of adaptive radiation are the finches studied by Darwin on the Galapagos Islands.
Islands are a relatively common environment for adaptive radiation to occur because of their isolation.
wiki.cotch.net /index.php/Adaptive_Radiation   (145 words)

  
 adaptive radiation on Encyclopedia.com
ADAPTIVE RADIATION [adaptive radiation] in biology, the evolution of an ancestral species, which was adapted to a particular way of life, into many diverse species, each adapted to a different habitat.
Adaptive radiation has occurred in the evolution of many groups of organisms, and is clearly illustrated by Hawaiian honey-creepers (see illustration).
Adaptive radiation in sticklebacks: trade-offs in feeding performance and growth.
www.encyclopedia.com /html/a/adaptive.asp   (464 words)

  
 Adaptive Radiation: Free Encyclopedia Articles at Questia.com Online Library
Adaptive Radiation of Darwins Finches: Recent Data Help...microenvironments; the tree overall represents an adaptive radiation.
Adaptive radiation has occurred in the evolution of many groups of organisms, and is...
Considerable adaptive radiation may be seen in the African species, which include a number of small seedeaters such as the lavender finch (E...
www.questia.com /library/encyclopedia/adaptive-radiation.jsp?l=A&p=1   (1332 words)

  
 Molecular Evolution and Adaptive Radiation - Cambridge University Press
This volume surveys recent advances in the study of adaptive radiation by bringing together a set of international experts studying adaptive radiation in a wide range of organisms in a variety of geographic settings.
Adaptive radiation of the Hawaiian silversword alliance: congruence and conflict of phylogenetic evidence from molecular and non-molecular investigations Bruce G. Baldwin; 4.
Adaptive radiation in the aquatic plant family Pontederiaceae: insights from phylogenetic analysis Spencer C. Barrett, and Sean W. Graham; 8.
www.cambridge.org /catalogue/print.asp?isbn=0521573297&print=y   (842 words)

  
 [No title]
Adaptive radiation is the evolutionary divergence of members of a single ancestral line into a series of different niches or adaptive zones.
Adaptive radiation is considered to be a rapid process, where adaptation from a recent common ancestor takes place in a short period of time (with respect to geological time, of course).
An adaptive zone is a set of ecological niches that may be occupied by a group of species that exploits the same resources in a similar manner.
jan.ucc.nau.edu /bio372/class/extinction/adaptrad.htm   (1150 words)

  
 Understanding ART: Adaptive Radiation Therapy | September 2004 | ImagingEconomics.com
"Adaptive radiation therapy is really more of a concept than it is a technology," Pouliot explains, adding that the ideas upon which adaptive radiation therapy is based were first arrived at more than a decade ago, when the requisite technology was still in a nascent stage.
Then, for the first few years after adaptive radiation therapy moved from the drawing board to the imaging suite, he adds, "It was technology-driven, but not any more, because it is a concept that can be approached in a number of ways, depending on the technology you favor or have access to for this purpose.
Since cancers of the head and neck typically respond well to radiation therapy, it is thought that the anticipated superior accuracy made possible by MV cone-beam CT will encourage practitioners to use higher doses in that region than are currently recognized as advisable.
www.imagingeconomics.com /library/200409-15.asp   (1308 words)

  
 Oxford University Press: The Ecology of Adaptive Radiation: Dolph Schluter   (Site not responding. Last check: 2007-11-07)
Adaptive radiation is the evolution of diversity within a rapidly multiplying lineage.
It focuses on the 'ecological' theory of adaptive radiation, a body of ideas that began with Darwin and were developed through the early part of the 20th century.
This theory proposes that phenotypic divergence and speciation in adaptive radiation are caused ultimately by divergent natural selection arising from differences in environment and competition between species.
www.us.oup.com /us/catalog/general/subject/LifeSciences/EvolutionaryBiology/~~/dmlldz11c2EmY2k9MDE5ODUwNTIyMQ==   (550 words)

  
 Evolution: Library: Adaptive Radiation: Darwin's Finches
This process, whereby species evolve rapidly to exploit empty ecospace, is known as adaptive radiation.
When Charles Darwin stepped ashore on the Galapagos Islands in September 1835, it was the start of five weeks that would change the world of science, although he did not know it at the time.
This process in which one species gives rise to multiple species that exploit different niches is called adaptive radiation.
www.pbs.org /wgbh/evolution/library/01/6/l_016_02.html   (463 words)

  
 1   (Site not responding. Last check: 2007-11-07)
Such an adaptive response has been noted after exposure to a variety of stressors such as ionizing radiation, radiomimetic chemicals, oxidative agents, alkylating compounds, or heat, but most of the information on the presence and the mechanisms of the adaptive response has been gathered for radiation exposure.
"…It thus appears that the adaptive response originates from a, still poorly defined, signal due to cellular (DNA) damage, proceeds through a chain of events involving synthesis/activation of certain proteins and genes, and results in a state where repair of DNA damage is, temporarily, improved, presumably by activation of DNA repair enzymes.
"Radiation exposure at low dose rates results, in general, in a greater cell survival and a lower rate of malignant transformed cells than that at high dose rates.
cnts.wpi.edu /rsh/dd3/3.0Stecca98.html   (897 words)

  
 OUP: Ecology of Adaptive Radiation: Schluter   (Site not responding. Last check: 2007-11-07)
It focuses on the 'ecological' theory of adaptive radiation, a body of ideas that began with Darwin and was developed through the early part of the 20
In The Ecology of Adaptive Radiation the author re-evaluates the ecological theory, along with its most significant extensions and challenges, in the light of all the recent evidence.
This important book is the first full exploration of the causes of adaptive radiation to be published for decades, written by one of the world's best young evolutionary biologists.
www.oup.co.uk /isbn/0-19-850523-X   (599 words)

  
 Adaptive radiation Info - Encyclopedia WikiWhat.com   (Site not responding. Last check: 2007-11-07)
Adaptive radiation describes the rapid evolutionary differentiation of a single or a few species to fill many ecological niches.
Darwin's finch are an example of adaptive radiation occurring in an archipelago.
Student loan consolidation is the process of taking your government and private loans to one low payment.
www.wikiwhat.com /encyclopedia/a/ad/adaptive_radiation.html   (409 words)

  
 AllRefer.com - adaptive radiation (Biology, General) - Encyclopedia
adaptive radiation, in biology, the evolution of an ancestral species, which was adapted to a particular way of life, into many diverse species, each adapted to a different habitat.
Adaptive radiation has occurred in the evolution of many groups of organisms, and is clearly illustrated by Hawaiian honey-creepers.
Another example is shown in Darwin's finches, 14 species of small land birds of the GalApagos Islands.
reference.allrefer.com /encyclopedia/A/adaptive.html   (248 words)

  
 Search Results for adaptive - Encyclopædia Britannica
Improvements in CNC machine tools depend on the refinement of adaptive control, which is the automatic monitoring and adjustment of machining conditions in response to variations in operation...
Since instinctive behaviour is assumed to be genetically based and therefore shaped by the pressures of natural selection, it follows that most of the consequences of instinctive activity contribute...
Throughout the life of the organism endocrine influences are at play to enhance the ability of the body to respond to internal and external stressful stimuli.
www.britannica.com /search?query=adaptive&submit=Find&source=MWTAB   (362 words)

  
 SparkNotes: Speciation: Adaptive Radiation
An adaptive radiation is a burst of evolution, creating several new species out of a single parent species.
As when we discussed species richness, it is useful here to think of uninhabited "islands" of habitat, though in this case, the islands merely need to be uninhabited by the species in question.
Darwin's finches are an excellent example of adaptive radiation.
www.sparknotes.com /biology/evolution/speciation/section3.rhtml   (362 words)

  
 Reappraising adaptive radiation -- Sanderson 85 (11): 1650 -- American Journal of Botany
In an ambitious historical and conceptual overview, one of the editors, Tom Givnish, argues for a view of adaptive radiation that is a subset of conventional usage.
an adaptive radiation is of secondary importance to the pattern
The theme of the intrinsic superiority of morphological data is closely paired with the notion that to understand adaptive radiation, which involves morphological diversification, it is necessary to reconstruct phylogenies without using morphology, to avoid circularity (e.g., pp.
www.amjbot.org /cgi/content/full/85/11/1650   (4150 words)

  
 Philips and RaySearch Sign New Letter of Intent Regarding Adaptive Radiation Therapy
Through the joint project to develop products for adaptive radiation therapy, the companies will secure their positions as leaders in the field.
Today there exist radiation treatment machines with integrated computed tomography that are well suited to this form of feedback and demand is rising for treatment planning systems that support adaptive radiation therapy.
The products are specially developed to optimize radiation therapy and the purpose is to adapt the radiation dose to the contours of the tumor, which allows high doses to be delivered to the tumor while minimizing the dose to surrounding healthy tissue.
www.primezone.com /newsroom?d=78408   (906 words)

  
 Adaptive radiation
This process is driven by mutation and natural selection.
The second-year class larger forms, harmony in its aesthetic.html">aesthetic bearings, the aesthetic and the various schools of composition." These valuable contributions to method and scope in the study of Wellesley, and are distinctly a part of her history.
All is still licensed under the GNU FDL.
www.wordlookup.net /ad/adaptive-radiation.html   (486 words)

  
 Genetic Constraints on Adaptive Radiation   (Site not responding. Last check: 2007-11-07)
he process of adaptive radiation is thought to have played a pivotal role in the evolution of life.
Numerous studies have examined the importance of adaptive radiation and have attempted to determine the factors that result in explosive and novel ecological diversification.
Escherichia coli, the most divergent genotype, adaptively radiated into both WS and FS morphotypes.
www.eih.uh.edu /publications/99annrep/99-travisano.htm   (696 words)

  
 Adaptive Radiation   (Site not responding. Last check: 2007-11-07)
One of the most striking evolutionary patterns biologists have observed is called adaptive radiation.
In this case, this isn't meant in the sense of speading out physically; it refers to one or a few species which diversify ("spread out") and generate multiple daughter species.
The most common situations which result in adaptive radiation occur following mass extinctions, or when species move into new, unoccupied regions.
www.cod.edu /people/faculty/fancher/AdaptiveRadiation.htm   (450 words)

  
 Adaptive radiation of photosynthetic physiology in the Hawaiian lobeliads: light regimes, static light responses, and ...
Adaptive radiation of photosynthetic physiology in the Hawaiian lobeliads: light regimes, static light responses, and whole-plant compensation points -- Givnish et al.
Adaptive radiation of photosynthetic physiology in the Hawaiian lobeliads: light regimes, static light responses, and whole-plant compensation points
radiation in photosynthetic traits that is strongly correlated
www.amjbot.org /cgi/content/full/91/2/228   (7279 words)

  
 Adaptive Radiation   (Site not responding. Last check: 2007-11-07)
All in all, there were many different species of finch which differed in beak shape and overall size.
This is adaptive radiation and natural selection at work.
This is where species all deriving from a common ancestor have over time successfully adapted to their environment via natural selection.
www.biology-online.org /2/15_adaptive_radiation.htm   (726 words)

  
 Evolution 101: The Big Issues
An adaptive radiation generally means an event in which a lineage rapidly diversifies, with the newly formed lineages evolving different adaptations.
Different factors may trigger adaptive radiations, but each is a response to an opportunity.
Release from competition/vacated niches: Lineages that invade islands may give rise to adaptive radiations because the invaders are free from competition with other species.
evolution.berkeley.edu /evosite/evo101/VIIB1aAdaptiveRadiation.shtml   (298 words)

  
 Hawaii Forest and Trail - Evolution
This is called adaptive radiation and is nowhere better developed than in the Hawaiian Islands.
The Hawaiian tarweeds are considered one of the finest examples in the plant world of adaptive radiation.
Another recurring characteristic of Hawaiian evolution is dramatic changes or adaptive shifts.
www.hawaii-forest.com /evolution.html   (740 words)

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