Sur les affinités biosystématiques et phytoécologiques de Juniperus thurifera L. et de Juniperus excelsa Bieb.

Barbéro, Marcel; Lebreton, Philippe; Quézel, Pierre

doi:10.3406/ecmed.1994.1739

Cited by 18 publications

(27 citation statements)

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“…6). These results confirm the hypothesis of the origin of the Grecian and Spanish junipers from one ancestral taxon (Barbero et al, 1994;Jiménez et al, 2003).…”

Section: Taxonomic Relationshipssupporting

confidence: 89%

“…The dimensional characters of cones (length and width, characters 2-4) did not allow us to distinguish the species. The average values of the cone diameter of all three taxa were about 8.0-8.5 mm (Table 6), similar to those reported earlier (do Amaral Franco, 1964, 1986Farjon, 1993;Barbero et al, 1994;Christensen, 1997;Farjon, 2005). In spite of that, the small differences between average values of dimensional characters of cones (traits 2-4) were statistically significant at a level of P = 0.01 (Fig.…”

Section: Differences Between Speciessupporting

confidence: 88%

“…Multiseed junipers of section Sabina occurred in Central Europe during the Tertiary (Kvaček, 2002). The probable divergence from a single tree-like ancestral taxon of scaly leaved juniper at the end of the Tertiary as a result of climate cooling was suggested to be a route of development of J. excelsa and J. thurifera (Barbero et al, 1994;Jiménez et al, 2003). The close similarity between these two species is demonstrated in the dispersion scatter plot, where the results of discrimination analysis are shown (Fig.…”

Section: Taxonomic Relationshipsmentioning

confidence: 82%

“…Juniperus excelsa, J. foetidissima and J. thurifera are considered to have originated from the same ancestor (Barbero, Lebreton & Quézel, 1994;Jiménez et al, 2003). As a result of occurring in geographically isolated refuges, it is assumed that their divergence could have taken place at the end of the Tertiary, with the climate cooling (Barbero et al, 1994;Jiménez et al, 2003). The present range of J. thurifera is separated from the ranges of J. excelsa and J. foetidissima, but the species are morphologically close.…”

mentioning

confidence: 99%

“…The migration route through the Balkan Peninsula led finally to the formation of J. excelsa (Barbero et al, 1994). However, the differences between Balkan and Crimean populations of the species (Mazur et al, 2004) suggest three possibilities: (1) two different ways of its migration; (2) long isolation in these two refuges; or (3) a different morphological divergence rate in the isolated populations.…”

mentioning

confidence: 99%

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Numerical taxonomy of Juniperus thurifera, J. excelsa and J. foetidissima (Cupressaceae) based on morphological characters

Marcysiak

Mazur

Romo

et al. 2007

Botanical Journal of the Linnean Society

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Juniperus excelsa and J. thurifera are considered to originate from the same ancestor. As a result of occurring in geographically isolated refuges -J. excelsa in SE Europe and SW Asia and J. thurifera in SW Europe and NW Africa -their divergence could have taken place at the end of the Tertiary, with the climate cooling. Juniperus foetidissima occurs in SE Europe and SW Asia in territories shared with J. excelsa and is similar to and sometimes misidentified with it. The occurrence of the latter two species over the same area suggests they should be more similar to each other than to the geographically distant J. thurifera. Four populations of J. excelsa ssp. excelsa, four of J. thurifera and two of Juniperus foetidissima were examined on the basis of features of 10 cones and 10 shoots of 18-36 specimens each. Results of discrimination analysis, Mahalanobis distances and cluster analysis showed great similarity to J. excelsa and J. thurifera, while J. foetidissima was more distant. The results support the hypothesis of a common ancestor of J. excelsa and J. thurifera, but suggest another origin of J. foetidissima.

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“…6). These results confirm the hypothesis of the origin of the Grecian and Spanish junipers from one ancestral taxon (Barbero et al, 1994;Jiménez et al, 2003).…”

Section: Taxonomic Relationshipssupporting

confidence: 89%

Section: Differences Between Speciessupporting

confidence: 88%

Section: Taxonomic Relationshipsmentioning

confidence: 82%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Numerical taxonomy of Juniperus thurifera, J. excelsa and J. foetidissima (Cupressaceae) based on morphological characters

Marcysiak

Mazur

Romo

et al. 2007

Botanical Journal of the Linnean Society

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What happens to species at the rear‐edge of their distribution in arid regions? The case of Juniperus thurifera L. in the Aurès Mountains (Algeria)

2022

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Algerian populations of Juniperus thurifera are the most restricted in terms of distribution and the least studied among all populations of the entire range of the species in the western Mediterranean region. Although this species is regarded as being of least concern according to the International Union for Conservation of Nature (IUCN), many studies have pointed to the need for its conservation, especially in North Africa, where populations are fragmented and the potential for regeneration is reduced. Understanding the current range of distribution of J. thurifera in Algeria and the environmental factors responsible for this is of key importance for the protection and restoration of these populations. In the present study, a maximum entropy approach (MaxEnt) was used to model the distribution of J. thurifera. Thirty occurrence records were analyzed in combination with climatic, topographic, and anthropogenic predictors at two different spatial resolutions (900 m and 30 m). The bestperforming model included climatic, topographic, and anthropogenic predictors, suggesting that the distribution of the species is influenced by a combination of factors, while the performance of climatic and topographic models was similar. The most important predictors of the occurrence of Algerian J. thurifera are water-related factors. However, when considering only topographic variables, altitude has a huge impact. Finally, using improved resolution for modeling distribution enhanced the prediction capability of the model (AUC = 0.942). The findings of the present study confirmed the resilience of J. thurifera, and highlighted the tolerance to drought of Algerian populations.

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Mediterranean forests, land use and climate change: a social-ecological perspective

et al. 2016

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Mediterranean forests are found in the Mediterranean basin, California, the South African Cape Province, South and southwestern Australia and parts of Central Chile. They represent 1.8 % of the world forest areas of which the vast majority is found in the Mediterranean basin, where historical and paleogeographic episodes, long-term human influence and geographical and climatic contrasts have created ecosystemic diversity and heterogeneity. Even if evergreen is dominant, deciduous trees are also represented, with different forest types including dense stands with a closed canopy (forests sensu stricto) and pre-forestal or pre-steppic structures with lower trees density and height. The Mediterranean basin is also a hot spot of forest species and genetic diversity, with 290 woody species versus only 135 for non-Mediterranean Europe. However, the characteristics of the Mediterranean area (long-standing anthropogenic pressure, significant current human activity and broad biodiversity) make it one of the world’s regions most threatened by current changes. Four examples of Mediterranean forest types, present in south and north of the Mediterranean basin and more or less threatened, are developed in order to show that linking “hard sciences” and humanities and social sciences is necessary to understand these complex ecosystems. We show also that these forests, in spite of specific climatic constraints, can also be healthy and productive and play a major ecological and social role. Furthermore, even if the current human activity and global change constitute a risk for these exceptional ecosystems, Mediterranean forests represent a great asset and opportunities for the future of the Mediterranean basin

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Sur les affinités biosystématiques et phytoécologiques de Juniperus thurifera L. et de Juniperus excelsa Bieb.

Cited by 18 publications

References 0 publications

Numerical taxonomy of Juniperus thurifera, J. excelsa and J. foetidissima (Cupressaceae) based on morphological characters

Numerical taxonomy of Juniperus thurifera, J. excelsa and J. foetidissima (Cupressaceae) based on morphological characters

What happens to species at the rear‐edge of their distribution in arid regions? The case of Juniperus thurifera L. in the Aurès Mountains (Algeria)

Mediterranean forests, land use and climate change: a social-ecological perspective

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