Co-invasion of invasive trees and their associated belowground mutualists
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1 Co-invasion of invasive trees and their associated belowground mutualists Martin. A. Nuñez*, Nahuel Policelli & Romina Dimarco *Grupo de Ecologia de Invasiones INIBIOMA, CONICET/U. del Comahue, Argentina
2 Biological invasions are a problem
3 434 tree species
4
5 Pines are native to the Northern hemisphere and highly invasive in the Southern hemisphere
6 1938 Pinus radiata plantation, est. 1935
7 Pinus radiata plantation, est Pinus radiata invasion, Jonkershoek, Stellenbosch (Richardson & Brown 1986; S. Afr. J. Bot. 52: )
8 Plantations in New Zealand
9 Plantations in New Zealand
10 Plantations in New Zealand
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12 Invasion Pinus contorta: 2007
13 Invasion Pinus contorta:
14 Invasion Pinus contorta:
15
16 What are the impacts of pine invasions? Ecosystem changes caused by the novel tree cover. Changes in fire regimes. Reduction in local diversity by competitive exclusion. Economic impacts. Change in ecosystem services Changes in scenic values. P. contorta in Chile
17 CSIR
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19 What are the impacts of pine invasions? Invasion of open ecosystems and disturbed environments. Ecosystem changes caused by the novel tree cover. Changes in fire regimes. Reduction in local diversity by competitive exclusion. Economic impacts Change in ecosystem services Changes in scenic values. P. contorta in Chile
20 But pines cannot invade alone...
21 Mycorrhizae Plant-fungi mutualism
22 Proportion of invasive trees
23 NON- NATIVE INVASIVE PLANT
24 NON- NATIVE INVASIVE PLANT NEEDS A MUTUALIST DOES NOT NEED A MUTUALIST
25 NON- NATIVE INVASIVE PLANT NEEDS A MUTUALIST DOES NOT NEED A MUTUALIST Proteaceae; some members of Brassicaceae family. Tamarix spp. Polygonum spp. Alliaria petiolata Embothrium coccineum
26 NON- NATIVE INVASIVE PLANT NEEDS A MUTUALIST DOES NOT NEED A MUTUALIST NEEDS A MUTUALIST THAT IS NOT COSMOPOL ITAN NEEDS A COSMOLITAN MUTUALIST
27 NON- NATIVE INVASIVE PLANT NEEDS A MUTUALIST DOES NOT NEED A MUTUALIST NEEDS A MUTUALIST THAT IS NOT COSMOPOLITA N NEEDS A COSMOLITAN MUTUALIST Arbuscular mycorrhizal invasive plants associated with generalist mycorrhizal fungi. Centaurea stoebe Trachycarpus fortunei
28 NEEDS A MUTUALIST NEEDS A MUTUALIST THAT IS NOT COSMOPOLIT AN IS NOT CAPABLE OF FORMING NOVEL ASSOCIATIONS FORMS NOVEL ASSOCIATIONS NON- NATIVE INVASIVE PLANT DOES NOT NEED A MUTUALIST NEEDS A COSMOLITAN MUTUALIST
29 NON- NATIVE INVASIVE PLANT NEEDS A MUTUALIST DOES NOT NEED A MUTUALIST NEEDS A MUTUALIST THAT IS NOT COSMOPOL ITAN NEEDS A COSMOLITAN MUTUALIST IS NOT CAPABLE OF FORMING NOVEL ASSOCIATIO NS FORMS NOVEL ASSOCIATIONS N-fixing native symbiont and invasive plants. Some ectomycorrhizal fungi with native plants. Eucalyptus sp Nothofagus antarctica
30 NON- NATIVE INVASIVE PLANT NEEDS A MUTUALIST DOES NOT NEED A MUTUALIST NEEDS A MUTUALIST THAT IS NOT COSMOPOL ITAN NEEDS A COSMOLITA N MUTUALIST IS NOT CAPABLE OF FORMING NOVEL ASSOCIATIO NS FORMS NOVEL ASSOCIATIO NS FAILS TO INVADE CO- INVADES
31 NON- NATIVE INVASIVE PLANT NEEDS A MUTUALIST DOES NOT NEED A MUTUALIST NEEDS A MUTUALIST THAT IS NOT COSMOPOL ITAN NEEDS A COSMOLITA N MUTUALIST IS NOT CAPABLE OF FORMING NOVEL ASSOCIATIO NS FORMS NOVEL ASSOCIATIO NS FAILS TO INVADE CO- INVADES Non-native ectomycorr hizal fungi associated with invasive Pinaceae species. Pinus contorta Pseudotsuga menziesii
32 NON- NATIVE INVASIVE PLANT HINDERS THE INVASION NEEDS A MUTUALIST DOES NOT NEED A MUTUALIST Woody Proteaceae; some members of Brassicaceae family. Tamarix spp. Polygonum spp. NEEDS A MUTUALIST THAT IS NOT COSMOPOLIT AN NEEDS A COSMOLITAN MUTUALIST Arbuscular mycorrhizal invasive plants associated with generalist mycorrhizal fungi. IS NOT CAPABLE OF FORMING NOVEL ASSOCIATION S FORMS NOVEL ASSOCIATION S N-fixing native symbiont and invasive plants. Some ectomycorrhizal fungi with native plants. FAILS TO INVADE CO-INVADES Non-native ectomycorrhizal fungi associated with invasive Pinaceae species. PROMOTES THE INVASION
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34
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37 Isla Victoria ; 135 exotic species were planted, many of them highly invasive elsewhere 1960 the project was stopped; plantations were not removed. Argentina Bariloche
38 Observed pattern of invasion: -High densities of exotic trees only near plantations (<50 m) Invaded forest Non-invaded forest
39 Deer Herbivory? Intrinsic invasiveness?? Seedling herbivory? Pine Invasion?? Seed Predation Propagule pressure Mycorrhizal Facilitation
40 Many attempts to plant pines failed due to the absence of mycorrhizae 5 year old pine WITHOUT mycorrhizae 6 year old pine with mycorrhizae
41 Greenhouse Cerca Con adición de inóculo Cerca Sin adición de inóculo Lejos Con adición de inóculo Lejos Sin adición de inóculo Suelo estéril
42 Greenhouse Cerca Con adición de inóculo Cerca Sin adición de inóculo Lejos Con adición de inóculo Lejos Sin adición de inóculo Suelo estéril
43 Greenhouse Cerca Con adición de inóculo Cerca Sin adición de inóculo Lejos Con adición de inóculo Lejos Sin adición de inóculo Suelo estéril
44 Greenhouse Cerca Con adición de inóculo Cerca Sin adición de inóculo Lejos Con adición de inóculo Lejos Sin adición de inóculo Suelo estéril
45 Aboveground Biomass (g) Greenhouse Cerca Con adición de inóculo Cerca Sin adición de inóculo Lejos Con adición de inóculo Lejos Sin adición de inóculo Suelo estéril
46 Aboveground Biomass (g) Greenhouse Aerial biomass Ponderosa 1.6 Ponderosa pine 1.2 mass (g) close with ECM addition Cerca Con adición de inóculo close w/out ECM Cerca Sin addition adición de inóculo Far with ECM additon Lejos Con adición de inóculo Far W/out ECM addition Lejos Sin adición de inóculo sterile Suelo estéril
47 Aboveground Biomass (g) Greenhouse Inoculum increased the biomass 3x Aerial biomass Ponderosa 1.6 Ponderosa pine 1.2 mass (g) close with ECM addition Cerca Con adición de inóculo close w/out ECM Cerca Sin addition adición de inóculo Far with ECM additon Lejos Con adición de inóculo Far W/out ECM addition Lejos Sin adición de inóculo sterile Suelo estéril
48 Aboveground Biomass (g) Greenhouse Inoculum increased the biomass 3x Aerial biomass Ponderosa 1.6 Ponderosa pine 1.2 mass (g) close with ECM addition Cerca Con adición de inóculo close w/out ECM Cerca Sin addition adición de inóculo Far with ECM additon Lejos Con adición de inóculo Far W/out ECM addition Lejos Sin adición de inóculo sterile Suelo estéril Nunez, Horton Simberloff 2009, Ecology
49 Aboveground biomass (g) Lodgepole pine Douglas fir Ponderosa pine Nunez, Horton Simberloff 2009, Ecology
50 Morphological & Molecular Analyses We analyzed fungal colonization using morphological and molecular (RFLPs and sequencing) techniques
51 Molecular analyses
52
53
54 Molecular analyses Hayward, Horton, Nuñez, 2015 New Phytologist
55 Molecular analyses Hayward, Horton, Nunez, 2015 New Phytologist
56 Molecular analyses
57 Rhizopogon sp.:
58 Pinaceae seeds Fungal spores Original Plantation (trees + associated fungi) Main Dispersers (wind for seeds, exotic deer and wild boar for fungi) Invasive trees and associated fungi Nuñez et al 2013 PLoS ONE
59
60 Invasion of non-pathogenic fungi is a complex phenomena, often ignored and can have very important consequences. Invasion of non-pathogenic fungi can be a problem: help invasion of trees, are toxic to humans, decrease local native fungal diversity, and many other not known effects Their control is very difficult once established, there are many alternatives. E.g. native inoculum should be the logical choice for Europe for pinaceaes.
61 Invasion of non-pathogenic fungi is a complex phenomena, often ignored and can have very important consequences. Invasion of non-pathogenic fungi can be a problem: help invasion of trees, are toxic to humans, decrease local native fungal diversity, and many other not known effects Their control is very difficult once established, there are many alternatives. E.g. native inoculum should be the logical choice for Europe for pinaceaes.
62 Dickie, Nuñez et al 2016
63 Invasion of non-pathogenic fungi is a complex phenomena, often ignored and can have very important consequences. Invasion of non-pathogenic fungi can be a problem: help invasion of trees, are toxic to humans, decrease local native fungal diversity, and many other not known effects Their control is very difficult once established, there are many alternatives. E.g. native inoculum should be the logical choice for Europe for pinaceaes.
64 Dickie, Nuñez et al 2016
65 Invasion of non-pathogenic fungi is a complex phenomena, often ignored and can have very important consequences. Invasion of non-pathogenic fungi can be a problem: help invasion of trees, are toxic to humans, decrease local native fungal diversity, and many other not known effects Their control is very difficult once established, there are many alternatives. E.g. native inoculum should be the logical choice for Europe for pinaceaes.
66 Thank you!
67
68 Invasion of non-pathogenic fungi is a complex phenomena ofter ignored and can have very importat concequences. Invasion of non-pathogenic fungi can be a problem: help invasion of trees, are toxic to humans, decrese local native fungal diversity Their control is very dificult once established, there are many alternatives. E.g. native inoculum should be the logical choice for Europe for pinaceaes.
69 There are ways to minimise the potential impacts of co-invasive mutualists; for example, the introduction of highly invasive non-native soil biota into new areas should be avoided. Also there are some mutualists that mostly spread asexually and seldom produce spores and they could be considered ideal for introduction. As mentioned before, absence of a co-invader may result in limited growth or complete failure of an introduced species, and so in some cases deliberate introduction of a mutualist might be considered desirable. For some introduced tree species that rely mostly on co-invasive mutualists, it could be possible to use native soil symbionts (Moeller et al. 2015), or to minimise introductions of new, non-native symbionts without biosecurity measures (e.g. by restricting movement of soil or trees in pots) Where deliberate introduction of a mutualist is considered, the potential for invasion by the mutualist, and the possible negative effects of that invasion, must be considered. Management of invasive soil biota or the restoration of areas invaded by soil symbionts is a daunting task given their belowground habit, their microscopic size and their ability to persist for long periods (Dickie et al. 2016). Therefore, it is of fundamental importance to control the spread of soil symbionts to avoid the numerous detrimental effects co-invasion can have. Efforts to control the spread of invasive species might be wasted if managers are unaware of co-invasion as a determining factor in whether a plant species becomes invasive or not.
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71 Field experiment eedlings grew more near plantation noculation Increases Establishment and Survival Treatment Controls
72 What can disperse these fungi? Wind? Rodents are not common around plantations Deer and wild boar could be dispersing the fungi
73 Exotic deer and pigs Collected feces from deer and pigs in native forest near plantations Add 5ml of feces into pots with sterile soil Plant seeds of Pseudotsuga menziesii and Pinus ponderosa
74 Percent of mycorrhizal seedlings Deer Wild boar Ponderosa pine Pseudotsuga Nuñez et al in 2013
75 Percent of mycorrhizal seedlings Deer Wild boar Ponderosa pine Pseudotsuga molecular results: Rhizopongon and Suillus are the main species being dispersed Nuñez et al in 2013
76 Forestry with pines is globally a very important industry
77 434 tree species
78
79 Pine Invasions Early seed production Small seed size Massive seed production High seedling growth rates Wide climatic tolerance Drought tolerance Freeze tolerance Enemy release especially in Southern hermisphere (Rejmánek & Richardson 1996, Grotkopp et al. 2001, Richardson 2006)
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