Leucojum fabrei

Lauw de Jager dejager@bulbargence.com
Fri, 19 Nov 2004 23:58:54 PST
Dear all,
Allthough I can see the Mont Ventoux from here, I can not add any more
information to this research. Possibly Pascal Vigneron can add some thing?
Kinds regards 

le 16/11/04 20:31, crinum@libero.it à crinum@libero.it a écrit :
No one has responded to Hans request for information about Leucojum fabrei
> some time ago. It isn't listed in any of my books. I looked it up in IPNI
> and this is what I found. Do any of our European list members know anything
> about it. Lauw, have you seen it? Does anyone grow it?
> Amaryllidaceae Leucojum fabrei Quézel  &  Girerd
> Bull. Soc. Bot. France, Lett. Bot. 137(1): 78. 1990
> A) An efficient conservation planning of rare plants is often obliterate by
> the lack of a
> comprehensive integration of ecological, biological and demographic data. This
> observation is particularly true if we consider the paucity of informations
> concerning
> threatened Mediterranean plants.
> The aims of our study are to examine through two rare geophytes: (i)
> microhabitats
> differences among and within populations, (ii) their influences on demography
> and on
> reproductive success, and (iii) their importance in relation to clonal versus
> sexual
> reproduction.
> Leucojum nicaeense Ardoino and Leucojum fabrei Quézel & Girerd are
> respectively
> endemic from the Maritimes Alps and the Mont Ventoux (south-east France).
> These two
> endemics exhibit contrasted patterns of rarity and threats: L. fabrei
> comprises only 3
> populations, whereas the about 20 known populations of L. nicaeense are
> seriously
> threatened by the tremendous urbanization and landscape fragmentation existing
> on the Côte d’Azur. Floristic and environmental data indicate that the two
taxa  mainly grow on xerophytic and rocky grasslands, but an higher
ecological amplitude exists for  L. nicaeense, which is found along a short
geographical gradient but a strong  ecological
> one. Demography of L. nicaeense seems to be influenced by the closed presence
> of a
> low ligneous stratum but L. fabrei shows no interference with regard to growth
> forms.
> Furthermore, reproductive success was positively correlated with population
> density for
> L. fabrei and with the total number individuals for L. nicaeense. Our results
> indicate that
> the importance of microhabitat-specific differences imply to consider the
> effects of a local
> scale variability. These data should allow to develop an adequate conservation
> planning
> in order to surmount the hugeness of the actual land-use changes
> characterizing this
> region.
> B) http://perso.club-internet.fr/v_pascal/…
Lauw de Jager
Mas d'Argence
30300 Fourques France
tel 31(0)466 016 519  fax 0466 011 245

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