Application des methodes architecturales aux coraux : quelques traits communs aux formes vivantes fixees

SIGLECNRS T Bordereau / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc

Reaction to the trauma: comparison between trees and corals

Observations and in situ experiments carried out between 1981 and 1983 near Pari Island, Seribu Archipelago, Java Sea, showed that reef-building corals can reiterate their specifie colony architecture after being subjected to an environmental trauma which irreversibly alters their characteristic appearance. Besides trees (Oldeman, 1974 ; Hailé, Oldeman and Tomlinson, 1978) many fixed colonial organisms such as hydroids, gorgonians, sponges and corals, display this process of architectural adjustment. Reiteration appears to be a fundamental characteristic of sessile organism

Une m\ue9thode de mod\ue9lisation graphique par ordinateur pour l\u27\ue9tude des coraux et des r\ue9cifs coralliens : \ue9tude pr\ue9liminaire

Volume: 18Start Page: 13End Page: 2

Essai d\u27application \ue0 un r\ue9cif corallien de la m\ue9thode du profil architectural utilis\ue9e dans l\u27\ue9tude des for\ueats tropicales

Volume: 16Start Page: 219End Page: 23

Essai de comparaison entre l\u27architecture des coraux et celle des v\ue9g\ue9taux

Volume: 16Start Page: 39End Page: 5

La réaction aux traumatismes : comparaison entre les arbres et les coraux

Observations and in situ experiments carried out between 1981 and 1983 near Pari Island, Seribu Archipelago, Java Sea, showed that reef-building corals can reiterate their specific colony architecture after being subjected to an environmental trauma which irreversibly alters their characteristic appearance. Besides trees (Oldeman, 1974 ; Hallé, Oldeman and Tomlinson, 1978) many fixed colonial organisms such as hydroids, gorgonians, sponges and corals, display this process of architectural adjustment. Reiteration appears to be a fundamental characteristic of sessile organisms.Dauget Jean-Marc. La réaction aux traumatismes : comparaison entre les arbres et les coraux. In: Revue d'Écologie (La Terre et La Vie), tome 40, n°1, 1985. pp. 113-118

Une méthode de modélisation graphique par ordinateur pour l'étude des coraux et des récifs coralliens : étude préliminaire

Nous présentons les bases d&#39;une méthode de modélisation par ordinateur que nous avons appliquée aux coraux. Elle permet, à partir de l&#39;analyse architecturale des espèces et la réalisation de programmes informatiques, d&#39;obtenir des images de synthèse en trois dimensions des structures coralliennes. Elle est utilisable au niveau du polype, à celui de la colonie, et peut être étendue à l&#39;étude de parcelles récifales.We present the basis of a computer modelling method that we applied to corals. Using both architectural analysis of species and elaboration of computer programs, it allows three dimensional synthesis images of corals structures. It can be used at the polyp level, at the colony level, and can be extended to the study of reef plots.</p

A gene graveyard in the genome of the fungus Podospora comata

WOS:000457456800015International audienceMechanisms involved in fine adaptation of fungi to their environment include differential gene regulation associated with single nucleotide polymorphisms and indels (including transposons), horizontal gene transfer, gene copy amplification, as well as pseudogenization and gene loss. The two Podospora genome sequences examined here emphasize the role of pseudogenization and gene loss, which have rarely been documented in fungi. Podospora comata is a species closely related to Podospora anserina, a fungus used as model in several laboratories. Comparison of the genome of P. comata with that of P. anserina, whose genome is available for over 10 years, should yield interesting data related to the modalities of genome evolution between these two closely related fungal species that thrive in the same types of biotopes, i.e., herbivore dung. Here, we present the genome sequence of the mat+isolate of the P. comata reference strain T. Comparison with the genome of the mat+isolate of P. anserina strain S confirms that P. anserina and P. comata are likely two different species that rarely interbreed in nature. Despite having a 94-99% of nucleotide identity in the syntenic regions of their genomes, the two species differ by nearly 10% of their gene contents. Comparison of the species-specific gene sets uncovered genes that could be responsible for the known physiological differences between the two species. Finally, we identified 428 and 811 pseudogenes (3.8 and 7.2% of the genes) in P. anserina and P. comata, respectively. Presence of high numbers of pseudogenes supports the notion that difference in gene contents is due to gene loss rather than horizontal gene transfers. We propose that the high frequency of pseudogenization leading to gene loss in P. anserina and P. comata accompanies specialization of these two fungi. Gene loss may be more prevalent during the evolution of other fungi than usually thought