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Auteur Marianne Philipp |
Documents disponibles écrits par cet auteur (3)
Affiner la rechercheDistribution of genetic variation within and among Danish populations of Armeria maritima, with special reference to the effects of population size / Inger Ravnholt Weidema in Hereditas, 124 (2) (1996)
Titre : Distribution of genetic variation within and among Danish populations of Armeria maritima, with special reference to the effects of population size Type de document : Imprimé Auteurs : Inger Ravnholt Weidema ; Hans Redlef Siegismund ; Marianne Philipp Année de publication : 1996 Article en page(s) : 121-129 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Génétique et écologie (dynamique, démographique, sélection) Mots-clés : Armeria maritima Willd. [1809] ssp. miscella (Merino) Malagarriga Résumé : Genetic variation encoded by five isozyme loci was investigated in 17 populations of Armeria maritima in Denmark. A. maritima maintains most of its isozymic variation within populations and it is concluded that gene dispersal within populations is relatively high since random union of gametes was found in all populations. From the level of differentiation between populations, an estimate of gene flow was obtained. This intermediate level of gene flow is not sufficient to keep the investigated populations together in geographical clusters, in spite of the fact that the species is very common and widespread, and that dispersal corridors, in the form of roadside verges, are abundant. A comparison of plant diameter, which is a measure of plant age, and individual heterozygosity revealed no correlation between these two variables. The size of populations was found to be significantly correlated with the level of isozymic variation, measured as He, mean number of alleles and number of polymorphic loci. In addition, the small populations showed a higher genetic differentiation (Fst= 0.30) than the larger populations (Fst= 0.17). Lien pérenne : DOI : 10.1111/j.1601-5223.1996.00121.x Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=137390
in Hereditas > 124 (2) (1996) . - 121-129Weidema, Inger Ravnholt, Siegismund, Hans Redlef, Philipp, Marianne 1996 Distribution of genetic variation within and among Danish populations of Armeria maritima, with special reference to the effects of population size. Hereditas, 124(2): 121-129.Documents numériques
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Article (1996)URL
Titre : Genetic variation in four species of Pedicularis (Scrophulariaceae) within a limited area in West Greenland Type de document : Imprimé Auteurs : Marianne Philipp Année de publication : 1998 Article en page(s) : 396-399 Langues : Anglais (eng) Mots-clés : Pedicularis sp. Résumé : Four closely related species of Pedicularis (Scrophulariaceae), an abundant plant genus in the Arctic, with different breeding systems were analyzed for amount and distribution of genetic variation at three sites at Qeqertarsuaq, West Greenland. Isozyme variation was found in two enzyme systems (phosphogluconate dehydrogenase and phosphoglucomutase) in only one of the of the species (P. lanata). Average genetic diversity (He) was 0.028, including monomorphic loci. Compared to the other three species investigated, P. lanata possesses the breeding system with the highest capacity for outcrossing in the study area and also shows the greatest morphological variation within is geographic distribution. There seems thus to be accordance between the morphological variation, breeding system and the population genetic results. Lien pérenne : DOI : 10.1080/00040851.1998.12002915 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=137910
in Arctic and alpine research > 30 (4) (11/1998) . - 396-399Philipp, Marianne 1998 Genetic variation in four species of Pedicularis (Scrophulariaceae) within a limited area in West Greenland. Arctic and alpine research, 30(4): 396-399.Documents numériques
article (1998)URLThe influence of plant and corolla size on pollen deposition and seed set in Geranium sanguineum (Geraniaceae) / Marianne Philipp (2000)
Titre : The influence of plant and corolla size on pollen deposition and seed set in Geranium sanguineum (Geraniaceae) Type de document : Tiré à part de revue Auteurs : Marianne Philipp ; Thomas Hansen Année de publication : 2000 Importance : 129-140 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Stratégie de production de semences (fécondité)
[CBNPMP-Thématique] Variabilité morphologiqueMots-clés : Geranium sanguineum L. Résumé : In a coastal grassland area the influence of plant and corolla size on insect visitation rate, pollen deposition on stigmas and seed set was measured in a natural population of Geranium sanguineum. Visits by bumble bees, the primal pollinators, were significantly affected by plant size measured as the number of flowers, and differences in visit rates among plants were explained by size differences among these. On average, larger plants had bigger corollas. The mean corolla area affected pollen deposition positively whereas deposition did neither affect seed set (number per flower) nor seed weight. Insects reaction to corolla size was dependent on plant size, and thus we found the effect of corolla size on pollen deposition to decline with plant size. Instead pollen deposition per plant seemed to be correlated to overall floral display. We argued that resource status of the individual plants could explain corolla size and seed set variation. The finding of some plant setting seeds while other plant with comparable size did not set any seeds could not be explained satisfactory by resource limitation. Lien pérenne : DOI : 10.1111/j.1756-1051.2000.tb01556.x Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=130512 Philipp, Marianne, Hansen, Thomas 2000 The influence of plant and corolla size on pollen deposition and seed set in Geranium sanguineum (Geraniaceae). Nordic journal of botany, 20(2) : 129-140.Exemplaires (1)
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