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Seasonal variation in native hydraulic conductivity between two deciduous oak species

Journal of Plant Ecology 2020年第1期13卷 78-86页

作者： Dilia Mota-Gutiérrez Guadalupe Arreola-González Rafael Aguilar-Romero Horacio Paz jeannine cavender-bares Ken Oyama Antonio Gonzalez-Rodriguez Fernando Pineda-García Facultad de Biología Universidad Michoacana de San Nicolás de Hidalgo.Edificio RCiudad UniversitariaGral.Francisco J.Múgica S/N A-1Felicitas de Río58030 MoreliaMichoacánMexico Escuela Nacional de Estudios Superiores Unidad MoreliaUniversidad Nacional Autónoma de México.Antigua Carretera a Pátzcuaro 8701Ex-Hacienda de San Joséde La Huerta58190 MoreliaMichoacánMexico Instituto de Investigaciones en Ecosistemas y Sustentabilidad Campus MoreliaUniversidad Nacional Autónoma de México.Antigua Carretera a Pátzcuaro 8701Ex-Hacienda de San Joséde La Huerta58190 MoreliaMichoacánMexico Deparment of Ecology Evolution and BehaviorUniversity of MinnesotaSaint PaulMN 55108USA

Aims Mechanisms of plant drought resistance include both tolerance and *** vulnerability to embolism and turgor loss point are considered traits that confer tolerance,while leaf abscission and deciduousness characterizes the avoidance *** these mechanisms are thought to trade-off expressing a continuum among species,little is known on how variation in the timing and duration of leaf shedding in response to drought affect the relationship between xylem and leaf *** the present study,we explored the extent to which drought tolerance differs between two oak(Quercus)species that exhibit different leaf shedding ***,we predicted that *** Trel.,which loses leaves at the end of the dry season(late-deciduous)and is thus exposed to a greater risk of cavitation,would be more drought tolerant and more conservative in its water use than *** Liebm.,which loses its leaves for only a short period of time in the middle of the dry season(brevideciduous).Methods The study was conducted in central Mexico in a single population of each of the two oak species,separated from each other by a distance of 1.58 km,and by an altitudinal difference of 191 *** deserticola(late deciduous)is more frequent down slope,while ***(brevideciduous)tends to occur at higher elevations along the *** assessed seasonal differences(rainy versus dry season)in native stem hydraulic conductivity,and tested for variation in xylem vulnerability to cavitation,leaf water use and leaf turgor loss point between the two *** Findings The two oak species did not differ in traits conferring drought tolerance,including xylem vulnerability to embolism,leaf turgor loss point,or stomatal ***,both species had different performance during the dry season;the brevideciduous species had lower negative impact in the xylem function than the late-deciduous ***,seasonal changes in plant physiological performance

关键词： Quercus hydraulic conductivity embolisms leaf phenology

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Multi-scale phylogenetic structure in coastal dune plant communities across the globe

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Journal of Plant Ecology 2014年第2期7卷 101-114页

作者： Ane Kirstine Brunbjerg jeannine cavender-bares Wolf L.Eiserhardt Rasmus Ejrnæs Lonnie W.Aarssen Hannah L.Buckley Estelle Forey Florian Jansen Jens Kattge Cynthia Lane Roy A.Lubke Angela T.Moles Ana Laura Monserrat Robert K.Peet Julissa Roncal Louise Wootton Jens-Christian Svenning Ecoinformatics&Biodiversity Group Department of BioscienceAarhus UniversityNy Munkegade 114DK-8000 Aarhus C.Denmark Department of Bioscience Aarhus UniversityGrenaavej 14DK-8410 RøndeDenmark Department of Ecology Evolution and BehaviorUniversity of Minnesota1987 Upper Buford CircleFalcon HeightsMN 55108USA Department of Biology Queens University116 Barrie StreetKingstonOntario K7L 3N6Canada Department of Ecology Lincoln UniversityPO Box 84Canterbury 7647New Zealand Laboratoire d’Ecologie EA 1293 ECODIVFED SCALEUFR Sciences et TechniquesUniversitéde Rouen76821 Mont Saint Aignan CedexFrance Institute of Botany and Landscape Ecology Soldmannstr.1517487 GreifswaldGermany Functional Biogeography Research Group Max Planck Institute for BiogeochemistryHans Knoell Str.1007745 JenaThuringiaGermany Lake Lily Ecology Ltd.PO Box 8455CanmoreAB T1W 2V2Canada Department of Botany Rhodes UniversityPO Box 94GrahamstownEast Cape 6140South Africa Evolution&Ecology Research Centre School of BiologicalEarth and Environmental SciencesThe University of New South WalesBotany RoadKensingtonSydneyNew South Wales 2034Australia Grupo de Investigación en Sistemas Ambientales Complejos Facultad de IngenieríaUniversidad de FloresPedernera 275Ciudad de Buenos AiresArgentina Department of Biology University of North CarolinaChapel HillNC 27599-3280USA Department of Biology Memorial University of Newfoundland232 Elizabeth AvenueSt.John'sNL A1B 3X9Canada Department of Biology Georgian Court University900 Lakewood AvenueLakewoodNJ 08701USA

Aims Studies integrating phylogenetic history and large-scale community assembly are few,and many questions remain ***,we use a global coastal dune plant data set to uncover the important factors in community assembly across scales from the local filtering processes to the global long-term diversification and dispersal *** dune plant communities occur worldwide under a wide range of climatic and geologic conditions as well as in all biogeographic ***,global patterns in the phylogenetic composition of coastal dune plant communities have not previously been *** The data set comprised vegetation data from 18463 plots in New Zealand,South Africa,South America,North America and *** phylogenetic tree comprised 2241 plant species from 149 *** calculated phylogenetic clustering(Net Relatedness Index,NRI,and Nearest Taxon Index,NTI)of regional dune floras to estimate the amount of in situ diversification relative to the global dune species pool and evaluated the relative importance of land and climate barriers for these diversification patterns by geographic analyses of phylogenetic *** then tested whether dune plant communities exhibit similar patterns of phylogenetic structure within ***,we calculated NRI for local communities relative to the regional species pool and tested for an association with functional traits(plant height and seed mass)thought to vary along sea–inland *** Findings Regional species pools were phylogenetically clustered relative to the global pool,indicating regional *** showed stronger clustering than NRI pointing to the importance of especially recent diversifications within *** species pools grouped phylogenetically into two clusters on either side of the tropics suggesting greater dispersal rates within hemispheres than between *** NRI plot values confirmed that most communities were also phylogenetically clus

关键词： disturbance phylogenetic community structure plant functional traits plant height seed mass

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橡树如何征服北半球

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环球科学 2020年第17期 36-43页

作者：安德鲁·L·希普保罗·S·马诺斯珍妮·卡文德-巴雷斯史恭乐(译) 美国伊利诺伊州莱尔市莫顿植物园植物标本馆美国杜克大学美国明尼苏达大学中国科学院南京地质古生物研究所

如果你被丢进5600万年前的北美洲,无论落到哪个区域,你恐怕都认不出自己的落脚点。这时地球刚刚进入始新世,气候比现今温暖湿润。位于北美大平原中间的古海洋刚刚封闭,落基山脉仍在缓慢抬升。北美大陆的动植物群落与现今截然不同。在现... 详细信息

如果你被丢进5600万年前的北美洲,无论落到哪个区域,你恐怕都认不出自己的落脚点。这时地球刚刚进入始新世,气候比现今温暖湿润。位于北美大平原中间的古海洋刚刚封闭,落基山脉仍在缓慢抬升。北美大陆的动植物群落与现今截然不同。在现今仅存较少苔原植物的加拿大北极群岛,当时全年温度高于冰点,孕育了丰富多样的植物。从加拿大最北端的埃尔斯米尔岛到格陵兰岛的西北海岸,是鳄鱼和巨型陆龟的故乡。

关键词：北美大陆始新世丰富多样加拿大北美洲

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