Saltatory Processes and Altricial to Precocial Forms in the Ontogeny of Fishes
Identifieur interne : 000A13 ( Main/Exploration ); précédent : 000A12; suivant : 000A14Saltatory Processes and Altricial to Precocial Forms in the Ontogeny of Fishes
Auteurs : Eugene K. Balon [Canada]Source :
- Integrative and Comparative Biology [ 1540-7063 ] ; 1981.
Abstract
SYNOPSIS. Development is not a gradual but a saltatory process. A combination of qualitative changes in form and function—thresholds—creates boundaries between a succession of quantitative intervals—steps. Thresholds can be modified by an altered time of appearance of structures and functions (heterochrony), especially during early ontogeny, to form an operational basis for the prolongation of juvenile characters and adaptability into later ontogeny. Whereas such prolongation enables juvenilization in phylogeny, analogous principles may operate on a much shorter time scale to produce the r-selection-like altricial and the K-selection-like precocial trends in ontogeny. The inherited capacity to adjust constantly to the environment (heterochrony) selects for structural, biochemical and behavioral improvements. The tendency is toward the precocial but the way back to altricial forms is left open. The heterochronous adaptations in early ontogeny can “reverse” the vulnerable specialization, should the environment become less stable and/or the community less competitive. Juvenilization, capable of turning gerontomorphosis into paedomorphosis in evolution, and heterochronous shifts of character anlagen, capable of turning a precocial trend into an altricial trend in ontogeny are both part of the same biological process which operates during early ontogeny.
Url:
DOI: 10.1093/icb/21.2.573
Affiliations:
Links toward previous steps (curation, corpus...)
- to stream Istex, to step Corpus: 000225
- to stream Istex, to step Curation: 000225
- to stream Istex, to step Checkpoint: 000688
- to stream Main, to step Merge: 000A40
- to stream Main, to step Curation: 000A13
Le document en format XML
<record><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title>Saltatory Processes and Altricial to Precocial Forms in the Ontogeny of Fishes</title><author wicri:is="90%"><name sortKey="Balon, Eugene K" sort="Balon, Eugene K" uniqKey="Balon E" first="Eugene K." last="Balon">Eugene K. Balon</name></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:9055BD216A553C089C240D224D0FD697C439E99E</idno><date when="1981" year="1981">1981</date><idno type="doi">10.1093/icb/21.2.573</idno><idno type="url">https://api.istex.fr/document/9055BD216A553C089C240D224D0FD697C439E99E/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">000225</idno><idno type="wicri:Area/Istex/Curation">000225</idno><idno type="wicri:Area/Istex/Checkpoint">000688</idno><idno type="wicri:doubleKey">1540-7063:1981:Balon E:saltatory:processes:and</idno><idno type="wicri:Area/Main/Merge">000A40</idno><idno type="wicri:Area/Main/Curation">000A13</idno><idno type="wicri:Area/Main/Exploration">000A13</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a">Saltatory Processes and Altricial to Precocial Forms in the Ontogeny of Fishes</title><author wicri:is="90%"><name sortKey="Balon, Eugene K" sort="Balon, Eugene K" uniqKey="Balon E" first="Eugene K." last="Balon">Eugene K. Balon</name><affiliation wicri:level="1"><country xml:lang="fr">Canada</country><wicri:regionArea>Department of Zoology, College of Biological Science, University of Guelph, Guelph, Ontario NIG 2W1</wicri:regionArea><wicri:noRegion>Ontario NIG 2W1</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j">Integrative and Comparative Biology</title><idno type="ISSN">1540-7063</idno><idno type="eISSN">1557-7023</idno><imprint><publisher>Oxford University Press</publisher><date type="published" when="1981">1981</date><biblScope unit="volume">21</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="573">573</biblScope><biblScope unit="page" to="596">596</biblScope></imprint><idno type="ISSN">1540-7063</idno></series><idno type="istex">9055BD216A553C089C240D224D0FD697C439E99E</idno><idno type="DOI">10.1093/icb/21.2.573</idno><idno type="ArticleID">21.2.573</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">1540-7063</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract">SYNOPSIS. Development is not a gradual but a saltatory process. A combination of qualitative changes in form and function—thresholds—creates boundaries between a succession of quantitative intervals—steps. Thresholds can be modified by an altered time of appearance of structures and functions (heterochrony), especially during early ontogeny, to form an operational basis for the prolongation of juvenile characters and adaptability into later ontogeny. Whereas such prolongation enables juvenilization in phylogeny, analogous principles may operate on a much shorter time scale to produce the r-selection-like altricial and the K-selection-like precocial trends in ontogeny. The inherited capacity to adjust constantly to the environment (heterochrony) selects for structural, biochemical and behavioral improvements. The tendency is toward the precocial but the way back to altricial forms is left open. The heterochronous adaptations in early ontogeny can “reverse” the vulnerable specialization, should the environment become less stable and/or the community less competitive. Juvenilization, capable of turning gerontomorphosis into paedomorphosis in evolution, and heterochronous shifts of character anlagen, capable of turning a precocial trend into an altricial trend in ontogeny are both part of the same biological process which operates during early ontogeny.</div></front></TEI><affiliations><list><country><li>Canada</li></country></list><tree><country name="Canada"><noRegion><name sortKey="Balon, Eugene K" sort="Balon, Eugene K" uniqKey="Balon E" first="Eugene K." last="Balon">Eugene K. Balon</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
EXPLOR_STEP=$WICRI_ROOT/Wicri/Eau/explor/ScalaireV1/Data/Main/Exploration
HfdSelect -h $EXPLOR_STEP/biblio.hfd -nk 000A13 | SxmlIndent | more
Ou
HfdSelect -h $EXPLOR_AREA/Data/Main/Exploration/biblio.hfd -nk 000A13 | SxmlIndent | more
Pour mettre un lien sur cette page dans le réseau Wicri
{{Explor lien
|wiki= Wicri/Eau
|area= ScalaireV1
|flux= Main
|étape= Exploration
|type= RBID
|clé= ISTEX:9055BD216A553C089C240D224D0FD697C439E99E
|texte= Saltatory Processes and Altricial to Precocial Forms in the Ontogeny of Fishes
}}
| This area was generated with Dilib version V0.6.27. |  |