Analyse palynologique préliminaire du Miocène dans le NE de la dépression du Duero (aire de Belorado, Burgos, España)

Valle, Maria Felicia Della; Gavilán, Gaspar Alonso; Carballo, María Rosario Rivas

doi:10.1016/s0016-6995(95)80017-4

Cited by 12 publications

(4 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They consist of two morphs associated to an incompatibility system (Baker, 1948; Bokhari, 1972; Weber, 1981; Weber-El-Ghobary, 1987; Morretti et al, 2015) and are usually reported in palynological papers indistinctly either as Limonium or Armeria type. Using the available fossil pollen from the Upper Miocene (van Campo, 1976; Muller, 1981), Upper-Middle Miocene (Rivas-Carballo et al, 1994) or Middle Miocene (Valle et al, 1995) is thus problematic. Therefore, we calibrated our dating analysis with age estimates from a recently published time tree of angiosperms calibrated with 171 macrofossils (Magallón et al, 2015).…”

Section: Methodsmentioning

confidence: 99%

Morphological Innovations and Vast Extensions of Mountain Habitats Triggered Rapid Diversification Within the Species-Rich Irano-Turanian Genus Acantholimon (Plumbaginaceae)

et al. 2019

View full text Add to dashboard Cite

The Irano-Turanian floristic region spans a topographically complex and climatically continental territory, which has served as a source of xerophytic taxa for neighboring regions and is represented by a high percent of endemics. Yet, a comprehensive picture of the abiotic and biotic factors that have driven diversification within this biota remains to be established due to the scarcity of phylogenetic studies. Acantholimon is an important component of the subalpine steppe flora of the Irano-Turanian region, containing c. 200 cushion-forming sub-shrubby pungent-leaved species. Our recent molecular phylogenetic study has led to enlarging the circumscription of this genus to include eight mono- or oligospecific genera lacking the characteristic life-form and leaves. Using the same molecular phylogeny, here we investigate the tempo and mode of diversification as well as the biogeographic patterns in this genus, to test the hypothesis that a combination of key morphological innovations and abiotic factors is behind Acantholimon high species diversity. Molecular dating analysis indicates that Acantholimon s.l. started to diversify between the Late Miocene and the Pliocene and the biogeographic analysis points to an Eastern Iran–Afghanistan origin. Macroevolutionary models support the hypothesis that the high diversity of the genus is explained by accelerated diversification rates in two clades associated with the appearance of morphological key innovations such as a cushion life-form and pungent leaves; this would have favored the colonization of water-stressed, substrate-poor mountainous habitats along the newly uplifted IT mountains during the Mio-Pliocene. Given the apparent similarity of mountain habitats for most species of Acantholimon, we hypothesize that its current high species diversity responds to a scenario of non-adaptive radiation fueled by allopatric speciation rather than evolutionary radiation driven by ecological opportunity. Similar scenarios might underlie the high diversity of other speciose genera in the topographically complex Irano-Turanian landscape, though this remains to be tested with fine-grained distribution and climatic data.

show abstract

Section: Methodsmentioning

confidence: 99%

Morphological Innovations and Vast Extensions of Mountain Habitats Triggered Rapid Diversification Within the Species-Rich Irano-Turanian Genus Acantholimon (Plumbaginaceae)

et al. 2019

View full text Add to dashboard Cite

show abstract

“…The 'Avicennia peak' and the large development of the coral reefs corresponded to a period of climatic optimum during Middle Miocene. This relatively warm period is characterized, in addition to the Avicennia pollen grains, by elements from megathermic tropical floras, now principally restricted to southern Asia, and that were present at that time in Spain [2,31], Portugal [1], Hungary [19,22], and Germany [30].…”

Section: Palaeoclimatic Reconstructionmentioning

confidence: 99%

“…Cette période chaude est confirmée par la présence d'éléments des flores tropicales mégathermes peuplant aujourd'hui, pour la plupart, l'Asie du Sud-Est. Ils sont par ailleurs connus au Miocène moyen, en Espagne (Aragonien de Burgos et de Teruel) [2,31], au Portugal (bassin du Tage) [1], en Hongrie-Bulgarie (Bassin pannonien) [19,22] et en Allemagne (formation de Ville) [30].…”

Section: Implications Paléoclimatiquesunclassified

Présence d'une mangrove à Avicennia au Miocène moyen dans la région de Digne (Alpes-de-Haute-Provence, France) : implications stratigraphiques et paléoclimatiques

Châteauneuf¹,

Bauer²,

Cojan³

2006

Comptes Rendus. Géoscience

View full text Add to dashboard Cite

Des grains de pollen d'un palétuvier du genre Avicennia, typique des mangroves néogènes d'Europe, ont été observés dans des faciès marins de la série deltaïque du Miocène moyen de Châteauredon (Sud-Est de la France). Le cadre stratigraphique conduit à proposer pour ces niveaux un âge entre 15,8 et 16,5 Ma. L'âge et la position de ces grains dans des faciès transgressifs sont en accord avec le développement connu de la mangrove en Méditerranée occidentale, rapportée à l'intervalle N8 et NN4 pro parte, et associée au haut niveau marin du Langhien. Cette mangrove, à une paléolatitude de 42 • N, est un témoin plus septentrional que celle connue au Miocène moyen en Provence. Elle implique un gradient latitudinal climatique plus faible que l'Actuel. Pour citer cet article :

show abstract

“…The use of mammal microfossils as palaeoprecipitation proxies reflect mean annual precipitations (MAP) of around 600 mm from 12 to 9 Ma, and below 600 mm from 8 to 3 Ma [5], favouring the establishment of open, savannah-type landscapes in large areas of the Iberian Peninsula. Therefore, Late Miocene Iberian forests only thrived in locations that met the necessary humidity and temperature conditions, such as river margins, lakes and wetlands [6,7], Atlantic regions with marine influence [8] and mountainous regions [9,10]. The intramontane La Cerdanya Basin is one of the places that met the required conditions to host forests during the Late Miocene.…”

Section: Introductionmentioning

confidence: 99%

Mapping the Late Miocene Pyrenean Forests of the La Cerdanya Basin, Spain

Altolaguirre

Mijarra

Casas‐Gallego

et al. 2023

Forests

View full text Add to dashboard Cite

The Late Miocene palaeofloras of the La Cerdanya Basin represent a unique look into the Pyrenean Miocene forested areas of the Iberian Peninsula at a time when the European warm and humid climate was experiencing progressive cooling and aridification. Macrofossils (leaves, seeds, fruits and cones) and miospores from several outcrops revealed the composition and abundances of the different plant species present in the area during the Tortonian and early Messinian geological stages (ca. 11.1–5.7 Ma). These fossils were found in the sediment deposits of an ancient lake system situated in the southwestern part of the basin. Previous studies indicated the presence of highly diversified mixed mesophytic forests with broadleaved evergreen and deciduous trees and conifers. However, the spatial structure and distribution of these forest types remains unknown. In the present work, the biomization method was used to infer the different late Miocene vegetation types from the basin. The extent of these vegetation types was calculated using a methodology for mapping vegetation units from fossil and biome data. While previous attempts at mapping Miocene vegetation units had a broad geographical scale, the present work aimed to map the extent of the vegetation units at a small scale, recreating local and specific vegetation changes in an abrupt basin. Results showed similarly high scores between for four biome types, which represent the different types of vegetation that coexisted in the basin during the Tortonian and the early Messinian: warm-temperate evergreen broadleaf and mixed woodlands (WTEM biome), temperate deciduous forests (TEDE) and cool conifer forests (COMX and COEG). Their extent was depicted in two vegetation maps, which account for differences in palaeoaltitude and palaeoclimate. These forests occupied different vegetation belts, which shifted upwards and downwards with climatic variations and the progressive uplift of the Pyrenees during the late Miocene. Azonal riparian forests and wetland vegetation occupied the more humid areas in the centre of the basin. Nonetheless, dry conditions during the early Messinian and decrease in the lake area degraded the wetland environments, which were partially replaced by broadleaved evergreen mixed woodlands.

show abstract

Analyse palynologique préliminaire du Miocène dans le NE de la dépression du Duero (aire de Belorado, Burgos, España)

Cited by 12 publications

References 4 publications

Morphological Innovations and Vast Extensions of Mountain Habitats Triggered Rapid Diversification Within the Species-Rich Irano-Turanian Genus Acantholimon (Plumbaginaceae)

Morphological Innovations and Vast Extensions of Mountain Habitats Triggered Rapid Diversification Within the Species-Rich Irano-Turanian Genus Acantholimon (Plumbaginaceae)

Présence d'une mangrove à Avicennia au Miocène moyen dans la région de Digne (Alpes-de-Haute-Provence, France) : implications stratigraphiques et paléoclimatiques

Mapping the Late Miocene Pyrenean Forests of the La Cerdanya Basin, Spain

Contact Info

Product

Resources

About