<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">GÓMEZ, J M</style></author><author><style face="normal" font="default" size="100%">Valladares, F</style></author><author><style face="normal" font="default" size="100%">PUERTA-PIÑERO, C</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Differences between structural and functional environmental heterogeneity caused by seed dispersal</style></title><secondary-title><style face="normal" font="default" size="100%">Functional Ecology</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">light environment</style></keyword><keyword><style  face="normal" font="default" size="100%">Quercus ilex</style></keyword><keyword><style  face="normal" font="default" size="100%">seed dispersal</style></keyword><keyword><style  face="normal" font="default" size="100%">spatial heterogeneity</style></keyword><keyword><style  face="normal" font="default" size="100%">structural vs functional heterogeneity</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2004</style></year></dates><publisher><style face="normal" font="default" size="100%">Blackwell Science Ltd</style></publisher><volume><style face="normal" font="default" size="100%">18</style></volume><pages><style face="normal" font="default" size="100%">787-792</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">* 1This paper explores the idea that functional heterogeneity (variability of a system property affecting ecological processes) is only a fraction of the available structural heterogeneity (variability of a property measured without reference to ecological effects) caused by non-random propagule dispersal. We report the effect of acorn dispersal by jays on the light environment experienced by Holm Oaks (Quercus ilex L.) during early recruitment in a Mediterranean montane forest. * 2Four light variables were estimated by studying hemispherical photographs: direct site factor (DSF); indirect site factor (ISF); and potential direct radiation during April (PDRApril) and August (PDRAugust). Means and variances of these variables were compared before and after the dispersal of acorns by jays. * 3The landscape occupied by Holm Oaks was very heterogeneous, which translated into differences in the available light among microhabitats of up to one order of magnitude. * 4Because of the spatial pattern of acorn dispersal, the light environment of the oaks during their establishment was much more homogeneous than that in the whole landscape. * 5This demonstrates that the heterogeneity relevant for plant recruitment is not necessarily that of the landscape as a whole.</style></abstract></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Calabuig, E L</style></author><author><style face="normal" font="default" size="100%">Navascués, I</style></author><author><style face="normal" font="default" size="100%">GÓMEZ, J M</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Análisis fenológico en pastizales de dehesa</style></title><secondary-title><style face="normal" font="default" size="100%">Pastos</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Dehesa</style></keyword><keyword><style  face="normal" font="default" size="100%">especies caracteristicas (voyant)</style></keyword><keyword><style  face="normal" font="default" size="100%">fenología</style></keyword><keyword><style  face="normal" font="default" size="100%">gradiente de oligotrofia</style></keyword><keyword><style  face="normal" font="default" size="100%">pastizales</style></keyword><keyword><style  face="normal" font="default" size="100%">Trifolium</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1980</style></year></dates><volume><style face="normal" font="default" size="100%">10</style></volume><pages><style face="normal" font="default" size="100%">17-30</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">One oí the features of the dynamics of the grazing-lands is represented by its evolution during primary growth, when all phenological sings of the plants are seen. In the «dehesa» área in Salamanca, the prevernal, vernal and aestival periods are the most significant, and show the highest quantity of differentiatingpoints between one typegrazing-land and another. It was during these periods that regular observadons were made in 21 allotments, which belong to the most representative communities in the área, showing for each of the species its phenological state at any given moment. The information gathered has been simplified so as to offer a more general view of the phenological aspects of each type of grazing-land, summarizing the observations made per species for the group of pastures of similar taxonomic category. Likewise, the species which showed phisionomical character were selected, i.e.: those which contribute in highest proportion to the biomass of the community; in a word, those species which are dominant due to their hi^her absolute frecuency or their greater covering. To-complement this, the characteristic species are also considered. This study, descriptive in its essence, enables us on the one hand, to correlate the specific phenological observations with the general characteristics of the grazing-land to which they belong, and, in the other, to analyse the evolution of the same species in different pastures. The results obtained are given graphically, showing the differences between the definable types of pasture using the oligotrophy-eutrophy gradient</style></abstract></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Montalvo, I</style></author><author><style face="normal" font="default" size="100%">García, B</style></author><author><style face="normal" font="default" size="100%">GÓMEZ, J M</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Variación de la composición mineral de la hierba de una pradera semiagostante con su estado de madurez</style></title><secondary-title><style face="normal" font="default" size="100%">Pastos</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">contenido mineral</style></keyword><keyword><style  face="normal" font="default" size="100%">crecimiento primario</style></keyword><keyword><style  face="normal" font="default" size="100%">estado de madurez</style></keyword><keyword><style  face="normal" font="default" size="100%">hierba (voyant)</style></keyword><keyword><style  face="normal" font="default" size="100%">variación estacional</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1977</style></year></dates><volume><style face="normal" font="default" size="100%">7</style></volume><pages><style face="normal" font="default" size="100%">280-295</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">In this paper seasonal advance and maturity effects on the contents of ten bioeiements (N, P, Na, K, Ca, Mg, Fe, Mn, Cu and Zn) in a grass community from a Salamanca área pasture, are studied. N, P, K, Fe, and Mn levéis show a high decreasing tendency with maturity while those of Na and Ca tend to increase. Influence by the plamt stage is very little: Cu, Mg, and Zn show no effect at all. Seasonal advance largely affects to K, Mn, Fe, Ca, and Na: causing a decrease in the contents of the first three and showing a tendency to increase in those of the 'last two. This influence slightly appeared in P and Mg, while N and Cu are not affected. Data of dried sustance production and each element productions along the chosen period for this study are included. June reaches the highest yieids with the exception of Cu and Mg whose máximum productions are found during the first fortnight of July. PASTOS</style></abstract></record></records></xml>