Microbial island biogeography: Isolation shapes the life history characteristics but not diversity of root-symbiotic fungal communities

Davison John, Moora Mari, Öpik Maarja, Ainsaar Leho, Ducousso Marc, Hiiesalu Inga, Jairus Teele, Johnson Nancy, Jourand Philippe, Kalamees Rein, Koorem Kadri, Meyer Jean-Yves, Püssa Kersti, Reier Ülle, Pärtel Meelis, Semchenko Marina, Traveset Anna, Vasar Martti, Zobel Martin. 2018. Microbial island biogeography: Isolation shapes the life history characteristics but not diversity of root-symbiotic fungal communities. ISME Journal, 12 (9) : 2211-2224.

Quartile : Outlier, Sujet : ECOLOGY / Quartile : Outlier, Sujet : MICROBIOLOGY

Résumé : Island biogeography theory is one of the most influential paradigms in ecology. That island characteristics, including remoteness, can profoundly modulate biological diversity has been borne out by studies of animals and plants. By contrast, the processes influencing microbial diversity in island systems remain largely undetermined. We sequenced arbuscular mycorrhizal (AM) fungal DNA from plant roots collected on 13 islands worldwide and compared AM fungal diversity on islands with existing data from mainland sites. AM fungal communities on islands (even those >6000 km from the closest mainland) comprised few endemic taxa and were as diverse as mainland communities. Thus, in contrast to patterns recorded among macro-organisms, efficient dispersal appears to outweigh the effects of taxogenesis and extinction in regulating AM fungal diversity on islands. Nonetheless, AM fungal communities on more distant islands comprised a higher proportion of previously cultured and large-spored taxa, indicating that dispersal may be human-mediated or require tolerance of significant environmental stress, such as exposure to sunlight or high salinity. The processes driving large-scale patterns of microbial diversity are a key consideration for attempts to conserve and restore functioning ecosystems in this era of rapid global change.

Mots-clés Agrovoc : biogéographie, écologie microbienne, écologie des populations, île, biodiversité, mycorhize arbusculaire, séquence d'adn, Mycorhizé

Mots-clés géographiques Agrovoc : Cabo Verde, Islande, Tasmanie, Nouvelle-Calédonie, Polynésie française, Guadeloupe, France, Suède, Estonie, Norvège, Espagne, Grèce

Mots-clés libres : Biogeography, Community ecology, Fungal ecology, Microbial ecology

Classification Agris : F40 - Écologie végétale
F70 - Taxonomie végétale et phytogéographie

Champ stratégique Cirad : Axe 6 (2014-2018) - Sociétés, natures et territoires

Auteurs et affiliations

• Davison John, University of Tartu (EST) - auteur correspondant
• Moora Mari, University of Tartu (EST)
• Öpik Maarja, University of Tartu (EST)
• Ainsaar Leho, University of Tartu (EST)
• Ducousso Marc, CIRAD-BIOS-UMR LSTM (FRA)
• Hiiesalu Inga, University of Tartu (EST)
• Jairus Teele, University of Tartu (EST)
• Johnson Nancy, Northern Arizona University (USA)
• Jourand Philippe, IRD (FRA)
• Kalamees Rein, University of Tartu (EST)
• Koorem Kadri, University of Tartu (EST)
• Meyer Jean-Yves, Délégation à la Recherche de la Polynésie française (PYF)
• Püssa Kersti, University of Tartu (EST)
• Reier Ülle, University of Tartu (EST)
• Pärtel Meelis, University of Tartu (EST)
• Semchenko Marina, University of Manchester (GBR)
• Traveset Anna, Global Change Research Group (ESP)
• Vasar Martti, University of Tartu (EST)
• Zobel Martin, University of Tartu (EST)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/598807/)

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