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Consequences for ectomycorrhizal fungi of the selective loss or gain of pine across landscapes.
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- Author(s): Karst, Justine; Randall, Morgan J.; Gehring, Catherine A.
- Source:
Botany; 2014, Vol. 92 Issue 12, p855-865, 11p- Subject Terms:
- Source:
- Additional Information
- Abstract: Altered disturbance regimes and novel introductions are causing rapid shifts in the distribution of pines ( Pinus L.). The functionally obligate symbiosis between pines and ectomycorrhizal (EM) fungi dictates that shifts in the distribution of one partner will affect the distribution of the other. In this review, we examine evidence for three hypotheses. (1) The loss of photosynthates through stress or tree mortality decreases the abundance of EM fungi and selects for less carbon-demanding species. (2) Pine introductions initiate establishment of novel EM fungal communities. (3) The extent of shifts in EM fungal abundance and community composition is mediated by surrounding vegetation. We find support for these hypotheses though changes in EM fungal abundance are variable and context-dependent. We posit that the consequences of shifts in EM fungal abundance and community composition extend beyond the individual tree to the landscape; these changes may affect population dynamics of both symbionts, ecosystem processes, and the conservation and evolution of fungi. In addition to conducting baseline surveys to assess the distribution of EM fungi, increasing our understanding of their function, morphology, propagation, and controls on host-specificity, and shifts would also assist in predicting the trajectory of ecosystems following the loss or gain of pine. [ABSTRACT FROM AUTHOR]
- Abstract: Les régimes de perturbation modifiés et les nouvelles introductions sont responsables des déplacements rapides de la distribution des pins ( Pinus L.). La symbiose fonctionnelle obligée entre les pins et les champignons ectomycorhizes (EM) signifie que des changements dans la distribution d'un partenaire affectera la distribution de l'autre. Dans cet article de revue, les auteurs examinent les données qui soutiennent trois hypothèses. (1) La perte de photosynthats à cause du stress ou de la mortalité des arbres diminue l'abondance des champignons EM et sélectionne les espèces à demande plus faible en carbone. (2) L'introduction du pin initie l'établissement de nouvelles communautés d'EM fongiques. (3) L'étendue des changements d'abondance des EM fongiques et la composition de la communauté passent par l'intermédiaire de la végétation environnante. Les auteurs ont trouvé un appui à ces hypothèses à travers le fait que les changements d'abondance des EM fongiques sont variables et dépendent du contexte. Ils postulent que les conséquences de ces déplacements sur le plan de l'abondance des EM fongiques et de la composition de la communauté vont au delà de l'arbre individuel vers l'écosystème ; ces changements peuvent affecter la dynamique de la population des deux symbiotes, les processus de l'écosystème et la conservation et l'évolution des champignons. En plus de réaliser des estimations de référence afin d'évaluer la distribution des EM fongiques, il est nécessaire de mieux comprendre leur fonction, leur morphologie, leur propagation et les contrôles de la spécificité à un hôte et des déplacements, afin de prédire la trajectoire des écosystèmes à la suite d'une perte ou d'un gain en pin. [Traduit par la Rédaction] [ABSTRACT FROM AUTHOR]
- Abstract: Copyright of Botany is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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