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| Titre : |
Plasticity to drought of the leaf hydraulic system in four species of the California coastal sage scrub
|
| Auteur(s) : |
Emilie Isasa, Auteur
Christine Scoffoni, Responsable de stage Université de Guyane, Organisme de soutenance |
| Type de document : | Mémoire |
| Filière : | M. : EFT -- Ecologie des Forêts Tropicales |
| Sujets : | Métabolisme hydrique ; Potentiel hydrique foliaire ; Feuille ; Californie ; Réchauffement global ; Résistance à la sécheresse |
| Résumé : |
Droughts have increased in incidence and severity in many regions of the globe and understanding how species and ecosystems will respond is of timely importance. Coastal California has been labelled as a potential “hotspot” for climate change by global and regional climate models, predicting an increase in temperature of up to 2ºC, along with increase indrought severity in the next 50 years. We studied four typical California coastal scrub species(Artemisia californica, Salvia mellifera, Ericameria palmeri, and Eriogonum fasciculatum) which we grew under three different water regimes (“wet”: 160% of native precipitation, “dry”:40% of native precipitation and “control” representing 100% of native precipitation). We investigated the differences across treatments in physiological traits [...] Droughts have increased in incidence and severity in many regions of the globe and understanding how species and ecosystems will respond is of timely importance. Coastal California has been labelled as a potential “hotspot” for climate change by global and regional climate models, predicting an increase in temperature of up to 2ºC, along with increase indrought severity in the next 50 years. We studied four typical California coastal scrub species(Artemisia californica, Salvia mellifera, Ericameria palmeri, and Eriogonum fasciculatum) which we grew under three different water regimes (“wet”: 160% of native precipitation, “dry”:40% of native precipitation and “control” representing 100% of native precipitation). We investigated the differences across treatments in physiological traits such as leaf hydraulic conductance (Kleaf), its vulnerability and stomatal conductance, along with differences instructural traits (leaf morphology, stomatal density and midrib vein length per area). We found overall little to no plastic responses in physiological and structural traits across species. These results suggest that the species could have enabled the herb to rapidly acclimate to drier habitats. Moreover, we can say that coastal sage scrub species may be seriously challenged when faced with droughts increasing in severity. |
| Date de publication : | 2018 |
| Format : | 26 p. / graph. n&b., tabl. n&b., photo coul. |
| Langue(s) : | Anglais |
| Lien vers la notice : | https://infodoc.agroparistech.fr/index.php?lvl=notice_display&id=222445 |
Exemplaires (1)
| Localisation | Emplacement | Pôle | Section | Cote | Support | Disponibilité |
|---|---|---|---|---|---|---|
| Kourou | Bibliothèque | AgroParisTech-Kourou | - | Numérique | Empruntable sous conditions Disponible |