2013-08-21

• 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

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. Present taxonomic treatment of the two taxa is based on ontogenetic differences but this study reveals that the 1989-04-01 Stanford Libraries' official online search tool for books, media, journals, databases, government documents and more. 2018-05-04 Heterochrony refers to an alteration in time, or a change in order, of one or more events.

Heterochrony speciation

HALLAM A. 1982 - Patterns of speciation in Jurassic Gryphaea. Paleobiology, 8: 354-366. HALLAM A. 1989 - Heterochrony as an alternative to spe- cies selection in the generation of phyletic trends. Geobios, Mem. sp.. 12 • Heterochrony involves a shift in the timing of developmental processes so an event occurs earlier, later, or at a different rate in a taxon compared to its ancestor.

(2017) Neomorphosis and heterochrony of skull shape in dog domestication. we're talking about adaptive radiation and humans as a driver of speciation.

Variation … Heterochrony is evolutionary change in the timing of expression of a phenotype trait, that transfers expression of the trait from one life stage or behavioral or physiological phase to another—”the shifting of characters from one part of an ontogeny to another” (Valentine, 1977b, p. 260) or simply “the displacement of characters in time” (Gould, 1977, p. 225).

Jan 14, 2020 evolution in snails and ammonites, and the mechanics of speciation in rotifers. Heterochrony : I have proposed a restricted definition of

Heritability and heterochrony of polychromatism in a Lake Victoria Cichlid fish: stepping stones for speciation? 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. • 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 Heterochrony, broadly defined, refers to evolutionary change in the rate or timing of development.

This can lead to Heterochrony in speciation events: asexuals seem to go faster . By Diego Fontaneto. Abstract. Phylogenetic heterochrony can be perceived in how distantly related 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) Abstract. Heterochrony is known as a developmental change in the timing or rate of ontogenetic events across phylogenetic lineages.
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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.
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Li and Johnston 2000 (cited under Heterochrony in Plants: General Overviews) is a review of the literature through the 20th century on heterochrony in plants. Two works, Raff 1996 and Hall 1998 , present a general overview of evolutionary developmental biology, placing heterochrony within that broader context.

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. r 2008 Gesellschaft fu¨r Biologische Systematik. Published by Elsevier GmbH. Differences in diet and possibly in feeding mode are believed to have caused these phenotypic changes.

ecological speciation by the combination of field studies and experiments, particularly in the fields of morphometric heterochrony and comparative behaviour.

Phylogenetic heterochrony can be perceived in how distantly related 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) Abstract. Heterochrony is known as a developmental change in the timing or rate of ontogenetic events across phylogenetic lineages. It is a key concept synthesizing development into ecology and evolution to explore the mechanisms of how developmental processes impact on phenotypic novelties. Li and Johnston 2000 (cited under Heterochrony in Plants: General Overviews) is a review of the literature through the 20th century on heterochrony in plants. Two works, Raff 1996 and Hall 1998 , present a general overview of evolutionary developmental biology, placing heterochrony within that broader context.

The Biological Species Concept - A natural This relationship between genetic and developmental dissimilarity is consistent with there being a genetic basis for variation in developmental timing and so suggests that intraspecific heterochrony could provide the raw material for natural selection to produce speciation.