<?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%">Jato, V</style></author><author><style face="normal" font="default" size="100%">Rodríguez-Rajo, F J</style></author><author><style face="normal" font="default" size="100%">Aira, M J</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Use of Quercus ilex subsp. ballota phenological and pollen-production data for interpreting Quercus pollen curves</style></title><secondary-title><style face="normal" font="default" size="100%">Aerobiologia</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">airborne pollen</style></keyword><keyword><style  face="normal" font="default" size="100%">Phenology</style></keyword><keyword><style  face="normal" font="default" size="100%">pollen production</style></keyword><keyword><style  face="normal" font="default" size="100%">Quercus</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2007</style></year></dates><volume><style face="normal" font="default" size="100%">23</style></volume><pages><style face="normal" font="default" size="100%">91-105</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Although aerobiological data are often used in phenological research as an indicator of ﬂowering, airborne pollen concentrations are inﬂuenced by a number of factors that could affect pollen curves. This paper reports on a study of various aspects of reproductive biology in Q. ilex subsp. ballota, together with environmental factors inﬂuencing pollen release and transport, with a view of achieving reliable interpretation of Quercus pollen curves in Ourense (NW Spain). Aerobiological data were recorded from 2002 to 2004 at two sites in the province of Ourense. From 1st February to the end of the ﬂowering period, phenological observations were carried out on 19 trees from the Q. ilex subsp. ballota population found in the Ourense area. Pollen production was calculated for the same trees. The chilling and heating requirements for triggering development were also calculated. The mean ﬂowering period lasted 11-15 days. Reduced pollen output per catkin and, especially, a reduced number of catkins per tree in 2003 and 2004, prompted a marked decline in overall pollen production. Major differences observed in Q. ilex subsp. ballota pollen curves were attributed to the considerable inﬂuence both of weather conditions during pollination and pollen production. In years with high pollen production and weather conditions favouring pollen release, Q. ilex subsp. ballota contributed almost 10% to the total Quercus pollen curve. Around 20% of the pollen trapped was captured before or after ﬂowering periods.</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%">Molina, Rafael Tormo</style></author><author><style face="normal" font="default" size="100%">Rodríguez, Adolfo Muñoz</style></author><author><style face="normal" font="default" size="100%">Palaciso, Inmaculada Silva</style></author><author><style face="normal" font="default" size="100%">López, Francisco Gallardo</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Pollen production in anemophilous trees</style></title><secondary-title><style face="normal" font="default" size="100%">Grana</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">anthers</style></keyword><keyword><style  face="normal" font="default" size="100%">flowers</style></keyword><keyword><style  face="normal" font="default" size="100%">inflorescences</style></keyword><keyword><style  face="normal" font="default" size="100%">pollen production</style></keyword><keyword><style  face="normal" font="default" size="100%">tree crown (voyant)</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1996</style></year><pub-dates><date><style  face="normal" font="default" size="100%">1996///</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://dx.doi.org/10.1080/00173139609430499</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">35</style></volume><pages><style face="normal" font="default" size="100%">38 - 46</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Abstract A study was made of the total pollen production per individual tree in ten anemophilous arboreal species (including wild, cultivated and ornamental species) of considerable aerobiological importance: Pinus pinaster, Ulmus minor, Juglans regia, Platanus hispanica, Quercus rotundifolia, Salix atrocinerea, Populus nigra, Acer negundo, Olea europaea and Fraxinus angustifolia. For each species three isolated well-shaped specimens of medium height were chosen, and the number of flowers per individual tree and the number of pollen grains per anther was estimated. The values of total pollen production varied between a little over 1000 million grains in Juglans regia and more than 500,000 million in one single tree in Quercus rotundifolia. For the production of pollen grains per anther, the values oscillated between 3000 grains in Juglans regia and 100,000 in Olea europaea. There is an exponential correlation between the size of the anthers and the number of pollen grains they contain. A linear correlation is also evident between the volume of the tree crown and the total production of inflorescences, flowers, anthers and pollen grains per individual tree. Based on this, a mean coefficient of the number of grains/meter of diameter of the tree crown is obtained which varies between 3.4 ? 108 for Juglans regia and 550.9 ? 108 for Quercus rotundifolia. The ratio between the number of anthers per inflorescence and the number of pollen grains per anther carries out a hyperbolic function; thus, the inflorescences with the most anthers have the anthers with the least pollen and viceversa. This ratio is also manifest between the number of grains per flower and the number of flowers per tree, as well as the number of grains per inflorescence and the number of inflorescences per tree.</style></abstract><issue><style face="normal" font="default" size="100%">1</style></issue><notes><style face="normal" font="default" size="100%">doi: 10.1080/00173139609430499doi: 10.1080/00173139609430499The following values have no corresponding Zotero field:&lt;br/&gt;publisher: Taylor &amp; Francis</style></notes></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%">Molina, Rafael Tormo</style></author><author><style face="normal" font="default" size="100%">Rodríguez, Adolfo Muñoz</style></author><author><style face="normal" font="default" size="100%">Palaciso, Inmaculada Silva</style></author><author><style face="normal" font="default" size="100%">López, Francisco Gallardo</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Pollen production in anemophilous trees</style></title><secondary-title><style face="normal" font="default" size="100%">Grana</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">anthers</style></keyword><keyword><style  face="normal" font="default" size="100%">flowers</style></keyword><keyword><style  face="normal" font="default" size="100%">inflorescences</style></keyword><keyword><style  face="normal" font="default" size="100%">pollen production</style></keyword><keyword><style  face="normal" font="default" size="100%">tree crown (voyant)</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1996</style></year></dates><publisher><style face="normal" font="default" size="100%">Taylor &amp; Francis</style></publisher><volume><style face="normal" font="default" size="100%">35</style></volume><pages><style face="normal" font="default" size="100%">38-46</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Abstract A study was made of the total pollen production per individual tree in ten anemophilous arboreal species (including wild, cultivated and ornamental species) of considerable aerobiological importance: Pinus pinaster, Ulmus minor, Juglans regia, Platanus hispanica, Quercus rotundifolia, Salix atrocinerea, Populus nigra, Acer negundo, Olea europaea and Fraxinus angustifolia. For each species three isolated well-shaped specimens of medium height were chosen, and the number of flowers per individual tree and the number of pollen grains per anther was estimated. The values of total pollen production varied between a little over 1000 million grains in Juglans regia and more than 500,000 million in one single tree in Quercus rotundifolia. For the production of pollen grains per anther, the values oscillated between 3000 grains in Juglans regia and 100,000 in Olea europaea. There is an exponential correlation between the size of the anthers and the number of pollen grains they contain. A linear correlation is also evident between the volume of the tree crown and the total production of inflorescences, flowers, anthers and pollen grains per individual tree. Based on this, a mean coefficient of the number of grains/meter of diameter of the tree crown is obtained which varies between 3.4 ? 108 for Juglans regia and 550.9 ? 108 for Quercus rotundifolia. The ratio between the number of anthers per inflorescence and the number of pollen grains per anther carries out a hyperbolic function; thus, the inflorescences with the most anthers have the anthers with the least pollen and viceversa. This ratio is also manifest between the number of grains per flower and the number of flowers per tree, as well as the number of grains per inflorescence and the number of inflorescences per tree.</style></abstract><notes><style face="normal" font="default" size="100%">doi: 10.1080/00173139609430499</style></notes><research-notes><style face="normal" font="default" size="100%">doi: 10.1080/00173139609430499</style></research-notes></record></records></xml>