Observations de quelques pollens d'Oléacées au microscope électronique à balayage

Renault-Miskovsky, Josette; Girard, Michel; Trouin, Michèle

doi:10.3406/quate.1976.1278

Cited by 14 publications

(14 citation statements)

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“…Remarks : Oleaceae types 1 to 4 correspond in size, aperture, and microreticulate to reticulate exine sculpturing to extant and fossil Oleaceae pollen (Renault‐Miskovsky, Girard & Trouin, ; Nilsson, ; Punt, Bos & Hoen, ; Sachse, ). The degree of morphological variability in pollen of Oleaceae differs greatly between genera and pollen morphology is not necessarily genus‐diagnostic, making a precise identification of dispersed Oleaceae pollen difficult [e.g.…”

Section: Systematic Palynologymentioning

confidence: 99%

“…Remarks : Pollen with similar sharp edged perpendicular ridges is present in Phillyrea angustifolia L. (Renault‐Miskovsky et al ., ; Sachse, ), Linociera obtusifolia (Lam.) H.Perrier and Noronhia linocerioides H.Perrier (Cerceau‐Larrivall, Straka & Friedrich, ).…”

Section: Systematic Palynologymentioning

confidence: 99%

“…21G-I) Description: Pollen, spheroidal to prolate, outline circular to weakly lobate in polar view, equatorial diameter 22-25 lm (LM), 20-23 lm (SEM); semitectate, exine 1.5-2.0 lm thick (LM), nexine thinner than sexine; tricolporate, ectocolpus length 2=3 À 3=4 of polar axis (LM, SEM), endoaperture indistinct; sculpturing microreticulate (LM, SEM), muri width 0.4- 0.7 lm (SEM), muri crested with weak ridges, ridges perpendicular to muri, lumina narrow and of irregular shape, lumina decreasing in size towards the colpi, nexine psilate (SEM). Remarks: Oleaceae types 1 to 4 correspond in size, aperture, and microreticulate to reticulate exine sculpturing to extant and fossil Oleaceae pollen (Renault-Miskovsky, Girard & Trouin, 1976;Nilsson, 1988;Punt, Bos & Hoen, 1991;Sachse, 2001). The degree of morphological variability in pollen of Oleaceae differs greatly between genera and pollen morphology is not necessarily genus-diagnostic, making a precise identification of dispersed Oleaceae pollen difficult [e.g.…”

Section: Class Coniferopsidamentioning

confidence: 99%

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The middle Miocene palynoflora and palaeoenvironments of Eskihisar (Yatağan basin, south-western Anatolia): a combined LM and SEM investigation

et al. 2016

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We investigated a palynological section from middle Miocene sediments at Eskihisar (south‐western Anatolia) to establish biogeographic links of the palynoflora and to infer the palaeoenvironment. Four algal palynomorphs, nine spore taxa, eight gymnosperms, three monocots and 67 dicot pollen types were encountered and investigated using the ‘single grain method’ that combines light microscopy and scanning electron microscopy. Two pollen zones reflect different phases of basin development. Zonal vegetation remained fairly stable across the section and reflects heterogeneous environments including broad‐leaved deciduous forest, subtropical forest and sclerophyllous and semi‐evergreen oak forest. Conifers were accessory elements in the broad‐leaved deciduous forest communities and replaced these at higher elevations. Some herbaceous taxa (Plumbaginaceae) indicate scattered occurrences of sandy and/or rocky soils. Biogeographic affinities are general Northern Hemisphere, North American and East Asian, as also suggested by the macrofossil record. Only two taxa provide potential biogeographic links with the African flora. This suggests that biome shifts of plant taxa between African subtropical/tropical biomes and Anatolian (western Eurasian) temperate forests and shrublands may have been rare in the middle Miocene.

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Section: Systematic Palynologymentioning

confidence: 99%

Section: Systematic Palynologymentioning

confidence: 99%

Section: Class Coniferopsidamentioning

confidence: 99%

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The middle Miocene palynoflora and palaeoenvironments of Eskihisar (Yatağan basin, south-western Anatolia): a combined LM and SEM investigation

et al. 2016

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“…Taxonomic identification followed Faegri and Iversen (1989) and Moore et al (1991). To distinguish the morphology of Plantago we followed Ubera et al (1988) while Renault-Miskovsky et al (1976) was used for the Oleaceae family. Differenciation of the morphotype Pinus pinaster was based on Arobba (1979) and Carrión et al (2000b).…”

Section: Methodsmentioning

confidence: 99%

Revealing the last 13,500 years of environmental history from the multiproxy record of a mountain lake (Lago Enol, northern Iberian Peninsula)

et al. 2009

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We present the Holocene sequence from Lago Enol (43°16′ N, 4°59′ W, 1070 m a.s.l.), Cantabrian Mountains, northern Spain. A multiproxy analysis provided comprehensive information about regional humidity and temperature changes. The analysis included sedimentological descriptions, physical properties, carbon and carbonate content, mineralogy and geochemical composition together with biological proxies including diatom and ostracod assemblages. A detailed pollen study enabled reconstruction of variations in vegetation cover, which were interpreted in the context of climate changes and human impact. Four distinct stages were recognized for the last 13,500 years: (i) a cold and dry episode that includes the Younger Dryas event (13,500−11,600 cal. yr BP);(ii) a humid and warmer period characterizing the onset of the Holocene (11,600−8700 1 cal. yr BP); (iii) a tendency toward a drier climate during the Middle Holocene (8700−4650 cal. yr BP); and (iv) a return to humid conditions following landscape modification by human activity (pastoral activities, deforestation) in the Late Holocene (4650−2200 cal. yr BP). Superimposed on relatively stable landscape conditions (e.g. maintenance of well established forests), the typical environmental variability of the southern European region is observed at this site.

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“…-This pollen is similar in size, aperture and sculpturing to pollen of extant Fraxinus (Martin & Drew, 1970;Miyoshi et al, 2011;Punt et al, 1991;Renault-Miskovsky et al, 1976 Description. -Pollen, oblate, outline convex triangular in polar view, equatorial diameter 65-85 µm (LM); eutectate, exine 2.0-2.5 µm thick (LM), nexine as thick as sexine; tripororate, aperture diameter 5-7 µm, apertures with annulus, annulus with ektoporus formed by sexine, nexine only reaches endoaperture; sculpturing scabrate (LM), microverrucate (SEM), microverrucae pebblestone-like; viscin threads present, viscin threads segmented, rope-like braided; abundance: very rare.…”

Section: Family Oleaceae Hoffmannsegg Et Linkmentioning

confidence: 82%

A combined light and scanning electron microscopy study

Bouchal

Zetter

Denk

2016

Grana

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The uppermost Eocene Florissant Formation, Rocky Mountains, Colorado, has yielded numerous insect, vertebrate, and plant fossils. Three previous comprehensive palynological studies investigated sections of lacustrine deposits of the Florissant Formation and documented the response of plant communities to volcanic eruptive phases but overall found little change in plant composition throughout the investigated sections. These studies reported up to 150 pollen and spore phenotypes. In the present paper we used a taxonomic approach to the investigation of dispersed pollen and spores of the Florissant Formation. Sediment samples from the shale units containing macrofossils were investigated using light microscopy (LM) and scanning electron microscopy (SEM). The general picture of the palynoflora is in agreement with previous studies. However, the combined LM and SEM investigation provides important complementary information to previous LM studies. While a fairly large amount of previous pollen determinations could be confirmed, the purported taxonomic affinities of several pollen phenotypes need to be revised. For example, pollen referred to as Podocarpus or Podocarpidites sp. belongs to the Pinaceae Cathaya, Tetracentron). In general, SEM investigations complement the LM palynological studies and improve the identification of dispersed pollen and spores and enable integration of data from dispersed fossil pollen into a wide range of comparative morphological, taxonomic, evolutionary, biogeographic, and phylogenetic studies.

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Observations de quelques pollens d'Oléacées au microscope électronique à balayage

Cited by 14 publications

References 0 publications

The middle Miocene palynoflora and palaeoenvironments of Eskihisar (Yatağan basin, south-western Anatolia): a combined LM and SEM investigation

The middle Miocene palynoflora and palaeoenvironments of Eskihisar (Yatağan basin, south-western Anatolia): a combined LM and SEM investigation

Revealing the last 13,500 years of environmental history from the multiproxy record of a mountain lake (Lago Enol, northern Iberian Peninsula)

A combined light and scanning electron microscopy study

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