1989-01-01 · HETEROCHRONY AS AN ALTERNATIVE TO SPECIES SELECTION IN THE GENERATION OF PHYLETIC TRENDS by ANTHONY HALLAM* ABSTRACT RI~SUMI~ Phyletic trends can be accounted for by anagene- sis or cladogenesis in conjunction with species selec- tion or effect macroevolution.

accompanied by ‘cryptic’ speciation. We conclude that both sequential and growth heterochrony appear to have played a key role in the evolution of Niphargus, the most diverse genus of freshwater amphipods. A preliminary list of heterochronic characters is provided. r 2008 Gesellschaft fu¨r Biologische Systematik. Published by Elsevier GmbH.

Selection of a sequence of species with a specific heterochronic trait can produce evolutionary trends in the form of pera- or paedomorphoclines. heterochrony are the same as for the rate and timing heterochrony, that is the growth rate and timing in the on- and offset of growth. In both of the different views of heterochrony the outcome is a shift in an event or in the growth rate that lead to a change from an ancestor to the descendant. This can lead to Speciation, Heterochrony, and Genetic Variation in Hispaniolan Palm-Tanagers; Speciation, Heterochrony, and Genetic Variation in Hispaniolan Palm-Tanagers. Phenotypic plasticity is described in terms of a qualitative model of heterochrony in which phenotypic change in morphology is explained as retardation of the normal developmental rate. s peciation via floral heterochrony and presumed mycorrhizal host switching of endemic butterfly orchids on 1the azorean archipelago r ichard m b ateman 2,8 p aula j r udall 2 m artin i b idartondo 2,3 s alvatore c ozzolino 4 , v alentina t ranchida-lombardo 5 m ark a c arine 6 and m Ónica m oura 7 Speciation via floral heterochrony and presumed mycorrhizal host switching of endemic Butterfly-orchids on the Azorean archipelago June 2014 American Journal of Botany 101(6) Heterochrony is known as a developmental change in the timing or rate of ontogenetic events across phylogenetic lineages.

Heterochrony speciation

It is a key concept synthesizing development into ecology and evolution to explore the mechanisms of how developmental processes impact on phenotypic novelties. Speciation via floral heterochrony and presumed mycorrhizal host switching of endemic Butterfly-orchids on the Azorean archipelago June 2014 American Journal of Botany 101(6) PHENOTYPIC PLASTICITY AND HETEROCHRONY IN CICHLASOMA MANAGUENSE (PISCES, CICHLIDAE) AND THEIR IMPLICAnONS FOR SPECIAnON IN CICHLID FISHES AXEL MEYER Museum ofVertebrate Zoology and Department ofZoology, University ofCalifornia, Berkeley, CA 94720 Abstract.- Cichlid fishes in African rift lakes have undergone rapidspeciation, resulting in "species Heritability and heterochrony of polychromatism in a Lake Victoria cichlid fish: stepping stones for speciation? Journal of experimental zoology. Part B - molecular and developmental evolution, 306B(2), pp. 168-176. Hoboken, N.J.: Wiley-Liss 10.1002/jez.b.21083 Differences in diet and possibly in feeding mode are believed to have caused these phenotypic changes. Phenotypic plasticity is described in terms of a qualitative model of heterochrony in which phenotypic change in morphology is explained as retardation of the normal developmental rate.

(sensu de the role of heterochrony in evolution, the fos- resulting in directional speciation. Defining speciation. Speciation is a lineage-splitting event that produces two or more separate species.

402-456-6526. Jenna Tesauro. 402-456-3653. Heterochrony Datism. 402-456-4007 Gavn Keach. 402-456-8939. Speciation Piek anhungered. 402-456-7304

Evidence from Jurassic bivalves. Paleobiology, 4: 16-25.

Mass turnover and heterochrony events in response to physical change Elisabeth S. Vrba lationship to speciation to encompass large numbers of lineages of diverse taxonomic background. The second topic ties together Gould's themes of punctuated macroevolution and heterochrony.

2013-08-21 Heterochrony, the change in the rate or timing of development between ancestors and their descendants, plays a major role in evolution. When heterochrony produces polymorphisms, it offers the possibility to test hypotheses that could explain its success across environments. Mass turnover and heterochrony events in response to physical change Elisabeth S. Vrba lationship to speciation to encompass large numbers of lineages of diverse taxonomic background. The second topic ties together Gould's themes of punctuated macroevolution and heterochrony.

1989-01-01 Phylogenetic heterochrony can be perceived in how distantly related pairs of sister species are, in the rate of diversification events through time of specific clades, and … PHENOTYPIC PLASTICITY AND HETEROCHRONY IN CICHLASOMA MANAGUENSE (PISCES, CICHLIDAE) AND THEIR IMPLICAnONS FOR SPECIAnON IN CICHLID FISHES AXEL MEYER Museum ofVertebrate Zoology and Department ofZoology, University ofCalifornia, Berkeley, CA 94720 Abstract.- Cichlid fishes in African rift lakes have undergone rapidspeciation, resulting in "species phenotypic plasticity and heterochrony in cichlasoma managuense (pisces, cichlidae) and their implications for speciation in cichlid fishes Axel Meyer Museum of Vertebrate Zoology and Department of Zoology, University of California, Berkeley, CA, 94720 • Premise of the study: Most orchid species native to the Macaronesian islands reflect immigration from western Europe or North Africa followed by anagenesis. The only putative exception is the butterfly orchids (Platanthera) of the Azores, where three species apparently reflect at least one cladogenetic speciation event. This multidisciplinary study explores the origin, speciation 2017-05-30 Speciation via floral heterochrony and presumed mycorrhizal host switching of endemic Butterfly-orchids on the Azorean archipelago June 2014 American Journal of Botany 101(6) accompanied by ‘cryptic’ speciation. We conclude that both sequential and growth heterochrony appear to have played a key role in the evolution of Niphargus, the most diverse genus of freshwater amphipods. A preliminary list of heterochronic characters is provided.
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Most researchers assume that there is little phenotypic variation in cichlid fishes.

1997-01-01 2002-03-19 Ontogenetic and morphological variation in 40 populations of the closely related species, Eucalyptus risdonii Hook.f. (Risdon Peppermint) and E. tenuiramis Miq. (Silver Peppermint), was assessed in a multivariate study of heteroblastic leaf (adult and juvenile) and fruit characters.
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A) The goal of natural selection is speciation. B) When reunited, two allopatric populations will not interbreed. C) Natural selection chooses the reproductive barriers for populations. D) Prezygotic reproductive barriers usually evolve before postzygotic barriers. E) Speciation is included within the concept of macroevolution.

Paleobiology, 8: 354-366. HALLAM A. 1989 - Heterochrony as an alternative to spe- cies selection in the generation of phyletic trends.

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Cichlid fishes in African rift lakes have undergone rapid speciation, resulting in “species flocks” with more than 300 endemic species in some of the lakes. Most researchers assume that there is little phenotypic variation in cichlid fishes. I report here extensive phenotypic plasticity in a Neotropical cichlid species. I examined the influence of diet on trophic morphology during ontogeny

On the other hand, evolutionary genetics will discuss the molecular basis for macroevolution, microevolution, speciation, atavistic transformation and animal May 8, 2014 Heterochrony, the phylogenic change in the time of developmental events or rate of them into a predictive model of evolution and speciation. Jan 14, 2020 evolution in snails and ammonites, and the mechanics of speciation in rotifers. Heterochrony : I have proposed a restricted definition of Heterochrony: beyond words - Volume 25 Issue 2. Google Scholar. Hallam, A. 1998. Speciation patterns and trends in the fossil record.