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Explanatory ecological factors for the persistence of desiccation-sensitive seeds in transient soil seed banks: Quercus ilex as a case study.
Ann Bot. 2016 Jan; 117(1):165-76.AB

Abstract

BACKGROUND AND AIMS

Dominant tree species in northern temperate forests, for example oak and beech, produce desiccation-sensitive seeds. Despite the potentially major influence of this functional trait on the regeneration and distribution of species under climate change, little is currently known about the ecological determinants of the persistence of desiccation-sensitive seeds in transient soil seed banks. Knowing which key climatic and microsite factors favour seed survival will help define the regeneration niche for species whose seeds display extreme sensitivity to environmental stress

METHODS

Using the Mediterranean Holm oak (Quercus ilex) forest as a model system, an in situ time-course monitoring of seed water status and viability was performed during the unfavourable winter season in two years with contrasting rainfall, at an instrumented site with detailed climate records. In parallel, the characteristics of the microhabitat and their influence on the post-winter water status and viability of seeds were investigated in a regional survey of 33 woodlands representative of the French distribution of the species.

KEY RESULTS

Time-course monitoring of seed water status in natural conditions confirmed that in situ desiccation is the main abiotic cause of mortality in winter. Critical water contents could be reached in a few days during drought spells. Seed dehydration rates were satisfactorily estimated using integrative climate proxies including vapour pressure deficit and potential evapotranspiration. Seed water status was therefore determined by the balance between water uptake after a rainfall event and water loss during dry periods. Structural equation modelling of microhabitat factors highlighted the major influence of canopy openness and resulting incident radiation on the ground.

CONCLUSIONS

This study provides part of the knowledge required to implement species distribution models which incorporate their regeneration niche. It is an important step forward in evaluating the ecological consequences of increasing winter drought and environmental filtering due to climate change on the regeneration of the most dominant Mediterranean tree species.

Authors+Show Affiliations

IRD, UMR DIADE, BP 64501, 34394 Montpellier, France and thierry.joet@ird.fr.CEFE UMR 5175, CNRS-Université de Montpellier-Université Paul-Valéry Montpellier-EPHE, BP 5051, 34293 Montpellier, France.IRD, UMR DIADE, BP 64501, 34394 Montpellier, France and.IRD, UMR DIADE, BP 64501, 34394 Montpellier, France and.CEFE UMR 5175, CNRS-Université de Montpellier-Université Paul-Valéry Montpellier-EPHE, BP 5051, 34293 Montpellier, France.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

26420203

Citation

Joët, Thierry, et al. "Explanatory Ecological Factors for the Persistence of Desiccation-sensitive Seeds in Transient Soil Seed Banks: Quercus Ilex as a Case Study." Annals of Botany, vol. 117, no. 1, 2016, pp. 165-76.
Joët T, Ourcival JM, Capelli M, et al. Explanatory ecological factors for the persistence of desiccation-sensitive seeds in transient soil seed banks: Quercus ilex as a case study. Ann Bot. 2016;117(1):165-76.
Joët, T., Ourcival, J. M., Capelli, M., Dussert, S., & Morin, X. (2016). Explanatory ecological factors for the persistence of desiccation-sensitive seeds in transient soil seed banks: Quercus ilex as a case study. Annals of Botany, 117(1), 165-76. https://doi.org/10.1093/aob/mcv139
Joët T, et al. Explanatory Ecological Factors for the Persistence of Desiccation-sensitive Seeds in Transient Soil Seed Banks: Quercus Ilex as a Case Study. Ann Bot. 2016;117(1):165-76. PubMed PMID: 26420203.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Explanatory ecological factors for the persistence of desiccation-sensitive seeds in transient soil seed banks: Quercus ilex as a case study. AU - Joët,Thierry, AU - Ourcival,Jean-Marc, AU - Capelli,Mathilde, AU - Dussert,Stéphane, AU - Morin,Xavier, Y1 - 2015/09/29/ PY - 2015/05/18/received PY - 2015/07/28/accepted PY - 2015/10/1/entrez PY - 2015/10/1/pubmed PY - 2016/9/27/medline KW - Mediterranean climate KW - Quercus ilex KW - Recalcitrant seeds KW - desiccation KW - drought KW - environmental filtering KW - germination KW - microhabitat KW - oak acorn KW - regeneration niche KW - seed survival KW - structural equation modelling SP - 165 EP - 76 JF - Annals of botany JO - Ann. Bot. VL - 117 IS - 1 N2 - BACKGROUND AND AIMS: Dominant tree species in northern temperate forests, for example oak and beech, produce desiccation-sensitive seeds. Despite the potentially major influence of this functional trait on the regeneration and distribution of species under climate change, little is currently known about the ecological determinants of the persistence of desiccation-sensitive seeds in transient soil seed banks. Knowing which key climatic and microsite factors favour seed survival will help define the regeneration niche for species whose seeds display extreme sensitivity to environmental stress METHODS: Using the Mediterranean Holm oak (Quercus ilex) forest as a model system, an in situ time-course monitoring of seed water status and viability was performed during the unfavourable winter season in two years with contrasting rainfall, at an instrumented site with detailed climate records. In parallel, the characteristics of the microhabitat and their influence on the post-winter water status and viability of seeds were investigated in a regional survey of 33 woodlands representative of the French distribution of the species. KEY RESULTS: Time-course monitoring of seed water status in natural conditions confirmed that in situ desiccation is the main abiotic cause of mortality in winter. Critical water contents could be reached in a few days during drought spells. Seed dehydration rates were satisfactorily estimated using integrative climate proxies including vapour pressure deficit and potential evapotranspiration. Seed water status was therefore determined by the balance between water uptake after a rainfall event and water loss during dry periods. Structural equation modelling of microhabitat factors highlighted the major influence of canopy openness and resulting incident radiation on the ground. CONCLUSIONS: This study provides part of the knowledge required to implement species distribution models which incorporate their regeneration niche. It is an important step forward in evaluating the ecological consequences of increasing winter drought and environmental filtering due to climate change on the regeneration of the most dominant Mediterranean tree species. SN - 1095-8290 UR - https://www.unboundmedicine.com/medline/citation/26420203/Explanatory_ecological_factors_for_the_persistence_of_desiccation_sensitive_seeds_in_transient_soil_seed_banks:_Quercus_ilex_as_a_case_study_ L2 - https://academic.oup.com/aob/article-lookup/doi/10.1093/aob/mcv139 DB - PRIME DP - Unbound Medicine ER -