<?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%">Figueroa, M. E.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Chlorophyll fluorescence, stress and survival in populations of Mediterranean grassland species</style></title><secondary-title><style face="normal" font="default" size="100%">Journal of Vegetation Science</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Drought</style></keyword><keyword><style  face="normal" font="default" size="100%">Fv/Fm</style></keyword><keyword><style  face="normal" font="default" size="100%">mortality</style></keyword><keyword><style  face="normal" font="default" size="100%">Photo-inhibition</style></keyword><keyword><style  face="normal" font="default" size="100%">photochemical efficiency</style></keyword><keyword><style  face="normal" font="default" size="100%">Photosystem II</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1997</style></year><pub-dates><date><style  face="normal" font="default" size="100%">1997///</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://onlinelibrary.wiley.com/doi/10.2307/3237033/full</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">8</style></volume><pages><style face="normal" font="default" size="100%">881 - 888</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Photosynthetic stress in response to a natural episode of frost and seasonal drought was assessed in a ‘dehesa’ grassland of SW Spain with a portable fluorimeter. Chlorophyll fluorescence characteristics of dark-adapted leaves of 11 abundant species of Mediterranean grassland were measured over the course of a growing season from November 1992 to July 1993. Concomitant changes in population size were estimated from censuses of permanent quadrats. There was a general decline in the photochemical efficiency (F v /Fm ) during the growing season and this was particularly evident late in the growing season (spring and early summer) when ambient temperatures were increasing rapidly and rainfall was low; it coincided with the period of most intense mortality for most species. A frost in early March (– 5 °C), when photosynthetically active radiation was relatively high, resulted in a small decrease in F v /Fm that was consistent across many species. The mechanisms of protection in species of Mediterranean grassland appear to be sufficiently effective to avoid damage to PSII for most of the year. For most species there was little evidence of photosystem II damage, as initial fluorescence (F 0 ) usually did not increase. Many of the effects observed were due to a reduction in Fm and thus were consistent with non-photochemical quenching. This could be adaptive in protecting PSII from damage in species that show little evidence of stress. The sharp increase in stress toward the end of the life cycle coincided with the fall in net population size.</style></abstract><issue><style face="normal" font="default" size="100%">6</style></issue></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%">Figueroa, M. E.</style></author><author><style face="normal" font="default" size="100%">Davy, A. J.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">RESPONSE OF MEDITERRANEAN GRASSLAND SPECIES TO CHANGING RAINFALL.</style></title><secondary-title><style face="normal" font="default" size="100%">Journal of Ecology</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">BOTANY</style></keyword><keyword><style  face="normal" font="default" size="100%">Grasslands</style></keyword><keyword><style  face="normal" font="default" size="100%">MEDITERRANEAN Coast (Spain)</style></keyword><keyword><style  face="normal" font="default" size="100%">RAINFALL frequencies</style></keyword><keyword><style  face="normal" font="default" size="100%">SPAIN (citation)</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1991</style></year><pub-dates><date><style  face="normal" font="default" size="100%">1991///</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://search.ebscohost.com/login.aspx?direct=true&amp;db=a9h&amp;AN=8985481&amp;lang=pt-br&amp;site=ehost-live&amp;scope=site</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">79</style></volume><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Investigates the long-term changes in the composition of a species-rich Mediterranean grassland in south-western Spain. Determination of the frequency of every species of herbaceous vascular plants annually; Domination of winter annual vegetation; Correlations between the logit of the total annual frequency of each species and rainfall totals; Link between species abundance and rainfall.</style></abstract><issue><style face="normal" font="default" size="100%">4</style></issue><notes><style face="normal" font="default" size="100%">Accession Number: 8985481; Figueroa, M.E. Davy, A.J.; Source Info: Dec91, Vol. 79 Issue 4, p925; Subject Term: GRASSLANDS; Subject Term: BOTANY; Subject Term: RAINFALL frequencies; Subject Term: MEDITERRANEAN Coast (Spain); Subject Term: SPAIN; Number of Pages: 17p; Document Type: ArticleAccession Number: 8985481; Figueroa, M.E. Davy, A.J.; Source Info: Dec91, Vol. 79 Issue 4, p925; Subject Term: GRASSLANDS; Subject Term: BOTANY; Subject Term: RAINFALL frequencies; Subject Term: MEDITERRANEAN Coast (Spain); Subject Term: SPAIN; Number of Pages: 17p; Document Type: ArticleThe following values have no corresponding Zotero field:&lt;br/&gt;publisher: Wiley-Blackwell</style></notes></record></records></xml>