Le genévrier thurifère (<i>Juniperus thurifera</i>L.) dans le Parc National du Mercantour (Alpes-Maritimes)

Borel, André; Polidori, J.-L.

doi:10.1080/01811797.1983.10824590

Cited by 6 publications

(5 citation statements)

References 10 publications

(4 reference statements)

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“…In the Pyrenees, the male‐biased sex ratio in the lower part of the stand is linked to the higher percentage of low and young trees in this former xerophilous grassland that today has been recolonized by J. thurifera . In the Alps, Borel & Polidori (1983) emphasized the high proportion of males in J. thurifera populations that are colonizing formerly terraced fields.…”

Section: Discussionmentioning

confidence: 99%

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Sex ratio and sexual dimorphism in mountain dioecious thuriferous juniper (Juniperus thurifera L., Cupressaceae)

Gauquelin

Bertaudière-Montès

Badri

et al. 2002

Botanical Journal of the Linnean Society

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Thuriferous juniper (Juniperus thurifera L), a dioecious bush or tree is only found in isolated parts of the western Mediterranean: France, Spain, Algeria and Morocco. These mountain juniper stands are seriously endangered in Morocco as a result of intensive wood removal, and in Europe as a result of recolonization of stands by pines or oaks. Field studies were conducted to investigate sex ratio and sexual dimorphism, never previously examined, in eight different populations in the Atlas mountains and, for comparison, in one of two populations in the French Pyrenees. The sex ratio was female‐biased for six of the eight Moroccan stands and especially for the oldest populations. The Pyrenean population showed a similar female‐biased ratio. This particular sex ratio is possibly linked to cost of reproduction, paid by both males and females. Sex ratios can also be linked to population dynamics. Males begin to flower slightly younger than females, which explains their apparent dominance in young populations in Morocco or in a recolonization zone with young trees in the Pyrenees. Studies concerning sexual dimorphism in the western High Atlas sites showed no significant difference in phytomass between males and females. Females appear to be significantly taller but with a lower radial growth. © 2002 The Linnean Society of London, Botanical Journal of the Linnean Society, 138, 237–244.

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Section: Discussionmentioning

confidence: 99%

“…Juniperus thurifera is a dioecious bush or tree with scaly leaves and cones that are bluish‐black when ripe. On very rare occasions monoecious trees are found (Borel & Polidori, 1983; Conrad, 1986; Lathuillière, 1994). Within the family Cupressaceae, it belongs to the subgenus Sabina (Spach) Kom.…”

Section: Introductionmentioning

confidence: 99%

Sex ratio and sexual dimorphism in mountain dioecious thuriferous juniper (Juniperus thurifera L., Cupressaceae)

Gauquelin

Bertaudière-Montès

Badri

et al. 2002

Botanical Journal of the Linnean Society

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“…Dispersal by domestic herbivores is less documented than avian and carnivore dispersal, but a positive effect of sheep endozoochot"y on germination and dissemination of Spanish juniper has been recognised (Borel andPolidori 1983, Heras et al 1994). Sheep are raised "extensively"" in Lerma.…”

Section: The Role Of Mammals As Seed Dispersersmentioning

confidence: 99%

Dispersal of Spanish juniper Juniperus thurifera by birds and mammals in a fragmented landscape

1999

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1999. Dispersal of Spanish juniper yiCfy/iL' w.s' timrifera by birds and mammals in a fragmented landscape. -Ecography 22: 193 204.Dispersal of Spanish juniper Junipems timriferu was examined in a farming landscape of central Spain to study the effects of fragmentation on the dispersal effectiveness of the different dispersers. and the eonsequenees for the plant. The study was conducted in two large forests (LF: 280 and 150 ha) representative of unfragmented eonditions, and 18 small isolated fragments (0.1-3 ha) which were classified in two groups: 1) FI, forest remnants with both high juniper cover and cone production (N =5): and 2) F2, remnants in which fragmentation has caused a heavy reduction in junipers (N = 13). Cone production, disperser abundances and quantity of dispersal by birds (Turdus thrushes) and mammals (earnivores, rabbits and sheep) were estimated throughout two study years. Dispersal by thrushes was measured in three types of trees representing a decreasing attraction focus to birds: Spanish junipers with cones (SJI). Spanish junipers without cones (SJ2) and holm oaks (HO). Cone production greatly decreased from LF to Fl and F2 in both study years, affeeting F2 dramatically. Thrush abundances were similar in LF and Fl, but thrushes lacked or were very scarce in F2, Carnivores showed an even distribution throughout the whole area, but herbivores were relatively scarce in F2 fragments, especially rabbits, which were lacking in the fragments under 0.6 ha. Patterns of seed deposition around trees showed decreaj>ing dispersal activity of thrushes from SJI (83.1% of the examined trees had seed-packets-thrush pellets) to SJ2 (53.6';

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“…On peut ainsi, aujourd'hui, observer de jeunes genévriers colonisant les champs ou les prairies abandonnées il y a 30 à 60 ans, de préférence au pied des versants rocheux où l'espèce est relativement fréquente. Ici comme dans les Alpes ou de l'autre côté des Pyrénées, nous avons affaire à des noyaux dits primaires sur sols pierreux et secondaires sur sols profonds (Borel & Polidori 1983 ;Cambecèdes et al 2005), ces derniers pouvant disparaître à long terme du fait de la concurrence avec d'autres essences.…”

Section: Discussionunclassified

Sur les peuplements de Genévrier thurifère (Juniperus thurifera L.) en Haut Pallars (Pyrénées centrales, Catalogne). Présentation géobotanique et écologique

Aymerich¹,

Villar²

2013

ecmed

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convivir con enebros -J. communis L.-y alguna vez con sabina negral (J. phoenicea L.), con la que de lejos se había confundido. Junto a las poblaciones que podemos considerar primarias, observamos también otras secundarias, consecuencia de la colonización reciente de antiguos pastos e incluso campos abandonados. En esta comunicación haremos un análisis fitotopográfico, florístico y biogeográfico de estos sabinares. En una primera interpretación representarían el resto de un área menos discontinuo por el valle medio del Ebro, gracias al hecho de que en esos enclaves han podido resistir la competencia de los bosques circundantes de Quercus ilex L. subsp. ballota (Desf.) Samp. Asimismo, los incendios, las plagas, el pastoreo y demás actividades humanas no han llegado a destruirlas.

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Le genévrier thurifère (Juniperus thuriferaL.) dans le Parc National du Mercantour (Alpes-Maritimes)

Cited by 6 publications

References 10 publications

Sex ratio and sexual dimorphism in mountain dioecious thuriferous juniper (Juniperus thurifera L., Cupressaceae)

Sex ratio and sexual dimorphism in mountain dioecious thuriferous juniper (Juniperus thurifera L., Cupressaceae)

Dispersal of Spanish juniper Juniperus thurifera by birds and mammals in a fragmented landscape

Sur les peuplements de Genévrier thurifère (Juniperus thurifera L.) en Haut Pallars (Pyrénées centrales, Catalogne). Présentation géobotanique et écologique

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