The interplay between propagule pressure, seed predation and ectomycorrhizal fungi in plant invasion

There are many hypotheses aiming to explain invasion success, but evaluating individual hypotheses in isolation may hinder our ability to understand why some species invade and others fail. Here we evaluate the interaction between propagule pressure, seed predation and missed mutua...

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Main Authors: Jaime Moyano, Mariana C. Chiuffo, Nahuel Policelli, Martin A. Nuñez, Mariano A. Rodriguez-Cabal
Format: Article
Language:English
Published: Pensoft Publishers 2019-02-01
Series:NeoBiota
Online Access:https://neobiota.pensoft.net/article/30978/download/pdf/
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spelling doaj-0dbd82a618854a55ade9e19c862d63922020-11-25T00:53:20ZengPensoft PublishersNeoBiota1619-00331314-24882019-02-0142455810.3897/neobiota.42.3097830978The interplay between propagule pressure, seed predation and ectomycorrhizal fungi in plant invasionJaime Moyano0Mariana C. Chiuffo1Nahuel Policelli2Martin A. Nuñez3Mariano A. Rodriguez-Cabal4Universidad Nacional del ComahueUniversidad Nacional del ComahueUniversidad Nacional del ComahueUniversidad Nacional del ComahueUniversidad Nacional del Comahue There are many hypotheses aiming to explain invasion success, but evaluating individual hypotheses in isolation may hinder our ability to understand why some species invade and others fail. Here we evaluate the interaction between propagule pressure, seed predation and missed mutualism in the invasion success of the pine, Pinus ponderosa. We evaluated the independent and interactive effects of propagule pressure and seed predation at increasing distances from a pine plantation. Additionally, because pines are obligate mutualists with ectomycorrhizal fungi (EMF) and pine invasions fail in the absence of their EMF symbionts, we evaluated EMF availability through a growth chamber bioassay. In this bioassay we measured root colonization by EMF with soil samples collected from the different distances from the plantation. We found that propagule pressure overwhelms seed predation only at the edge of the pine plantation, while seed predation overcomes propagule pressure at 25 m and further distances from the plantation. We also found that EMF root colonization decreases with distance from the plantation. However, pine roots were colonized up to 200 m from the plantation, suggesting that EMF may not be hindering invasion, at least not on the scale of this experiment. Taken together our results demonstrate that seed predation may be limiting the invasion of P. ponderosa in the study region as propagule pressure only overcomes seed predation at the plantation edge. Here we provide evidence of how strong biotic resistance can suppress an invasion, regardless of the variation in propagule pressure and the availability of mutualists. https://neobiota.pensoft.net/article/30978/download/pdf/
collection DOAJ
language English
format Article
sources DOAJ
author Jaime Moyano
Mariana C. Chiuffo
Nahuel Policelli
Martin A. Nuñez
Mariano A. Rodriguez-Cabal
spellingShingle Jaime Moyano
Mariana C. Chiuffo
Nahuel Policelli
Martin A. Nuñez
Mariano A. Rodriguez-Cabal
The interplay between propagule pressure, seed predation and ectomycorrhizal fungi in plant invasion
NeoBiota
author_facet Jaime Moyano
Mariana C. Chiuffo
Nahuel Policelli
Martin A. Nuñez
Mariano A. Rodriguez-Cabal
author_sort Jaime Moyano
title The interplay between propagule pressure, seed predation and ectomycorrhizal fungi in plant invasion
title_short The interplay between propagule pressure, seed predation and ectomycorrhizal fungi in plant invasion
title_full The interplay between propagule pressure, seed predation and ectomycorrhizal fungi in plant invasion
title_fullStr The interplay between propagule pressure, seed predation and ectomycorrhizal fungi in plant invasion
title_full_unstemmed The interplay between propagule pressure, seed predation and ectomycorrhizal fungi in plant invasion
title_sort interplay between propagule pressure, seed predation and ectomycorrhizal fungi in plant invasion
publisher Pensoft Publishers
series NeoBiota
issn 1619-0033
1314-2488
publishDate 2019-02-01
description There are many hypotheses aiming to explain invasion success, but evaluating individual hypotheses in isolation may hinder our ability to understand why some species invade and others fail. Here we evaluate the interaction between propagule pressure, seed predation and missed mutualism in the invasion success of the pine, Pinus ponderosa. We evaluated the independent and interactive effects of propagule pressure and seed predation at increasing distances from a pine plantation. Additionally, because pines are obligate mutualists with ectomycorrhizal fungi (EMF) and pine invasions fail in the absence of their EMF symbionts, we evaluated EMF availability through a growth chamber bioassay. In this bioassay we measured root colonization by EMF with soil samples collected from the different distances from the plantation. We found that propagule pressure overwhelms seed predation only at the edge of the pine plantation, while seed predation overcomes propagule pressure at 25 m and further distances from the plantation. We also found that EMF root colonization decreases with distance from the plantation. However, pine roots were colonized up to 200 m from the plantation, suggesting that EMF may not be hindering invasion, at least not on the scale of this experiment. Taken together our results demonstrate that seed predation may be limiting the invasion of P. ponderosa in the study region as propagule pressure only overcomes seed predation at the plantation edge. Here we provide evidence of how strong biotic resistance can suppress an invasion, regardless of the variation in propagule pressure and the availability of mutualists.
url https://neobiota.pensoft.net/article/30978/download/pdf/
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