%0 Journal Article
%T An¨¢lisis ecol¨®gico de la flora de dos parcelas pirenaicas de seguimiento de los ecosistemas forestales.
%A Madotz
%A N.
%A Cavero
%A R. Y.
%A Ederra
%A A.
%J Pirineos : Revista de Ecolog¨ªa de Monta£¿a
%D 2005
%I Consejo Superior de Investigaciones Cient¨ªficas
%X Plants with hermaphrodite flowers show a trade-off in resource allocation to male and female functions of reproduction. Such a balance can be conditioned by several factors. One of them seems to be pollination vector. Thalictrum is a genus with species that use different ways of pollination. So that we have investigated the resource allocation patterns to each function (male and female) among five species with different pollination vectors. Allocation has been mesured as dry weight of the different flower structures. We have found a significative trend, male function relative investment is bigger in anemophilous than entomophilous among the flve studied species: Th. macrocarpum (wind pollinated), Th. Minus (zoind pollinated), Th. Aquilegiifolium (insect pollinated), Th. tuberosum (insect pollinated) and Th. flavum (insect pollinated). During bloom, the androecium has the the greater biomass in these five species, but when all the reproductive process is taken in account, fruits reach higher values. Furthermore, this temporal separation of the maximum allocation to each function would be a way to make competence for the same limited resources weaker. [fr] La v¨¦g¨¦tation de deux placettes permanentes de suivi des ¨¦cosyst¨¨mes forestiers (23Qf: ch¨ºnaie; 24Ps: pin¨¨de-sapini¨¨re) situ¨¦es dans les Pyr¨¦n¨¦es occidentales a ¨¦t¨¦ ¨¦chantillonn¨¦e pendant un an, afin d'analyser les types biologiques et chorologiques et de caract¨¦riser son ¨¦tat actuel d'apr¨¨s le Syst¨¨me de Valeurs Indicatrices d'Ellenberg. Les valeurs moyennes obtenues pour chacun des facteurs et le pourcentage des taxons correspondant ¨¤ chacune des valeurs ont ¨¦t¨¦ compar¨¦s pour assurer qu 'elles montrent des diff¨¦rences entre placettes ainsi qu'entre les diff¨¦rents habitats de la placette 24Ps. Puisque les valeurs moyennes de la flore sont li¨¦es ¨¤ d'autres caract¨¦ristiques de la v¨¦g¨¦tation, elles pourraient ¨ºtre employ¨¦es comme des indicateurs du changement futur du milieu. [es] Tras los muestreos de la vegetaci¨®n durante un a o en dos -parcelas pirenaicas de Seguimiento de los Bosques (23Qf: robledal; 24Ps: pinar-abetal), analizamos los espectros biol¨®gico y corol¨®gico y caracterizamos su estado actual empleando el Sistema de Valores ecol¨®gicos de las Plantas de Ellenberg. Comparamos los valores promedio obtenidos para cada factor, as¨ª como la distribuci¨®n porcentual de los taxones asignados a cada valor en ambas parcelas, comprobando que reflejan las diferencias entre ellas, as¨ª como entre los diversos ambientes de la parcela 24Ps. Los valores promedio de la flora est¨¢n relacionados con otras caracter
%K Resources asignation
%K male and female reproductive fonctions
%K investing moment
%K Thalictrum
%K pollinating vectors
%K Pyrenees
%K Spain
%K For¨ºts de ch¨ºne pubescent et de pin silvestre-sapin
%K suivi de parcelles foresti¨¨res
%K valeurs d'Ellenberg
%K Pyr¨¦n¨¦es
%K Espagne
%K Robledales pubescentes
%K pinares de pino silvestre con abeto
%K seguimiento de parcelas forestales
%K sistema de Ellenberg
%K Pirineos
%K Espa a
%U http://pirineos.revistas.csic.es/index.php/pirineos/article/view/36/37