1
|
McGeoch MA, Clarke DA, Mungi NA, Ordonez A. A nature-positive future with biological invasions: theory, decision support and research needs. Philos Trans R Soc Lond B Biol Sci 2024; 379:20230014. [PMID: 38583473 PMCID: PMC10999266 DOI: 10.1098/rstb.2023.0014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2023] [Accepted: 01/24/2024] [Indexed: 04/09/2024] Open
Abstract
In 2050, most areas of biodiversity significance will be heavily influenced by multiple drivers of environmental change. This includes overlap with the introduced ranges of many alien species that negatively impact biodiversity. With the decline in biodiversity and increase in all forms of global change, the need to envision the desired qualities of natural systems in the Anthropocene is growing, as is the need to actively maintain their natural values. Here, we draw on community ecology and invasion biology to (i) better understand trajectories of change in communities with a mix of native and alien populations, and (ii) to frame approaches to the stewardship of these mixed-species communities. We provide a set of premises and actions upon which a nature-positive future with biological invasions (NPF-BI) could be based, and a decision framework for dealing with uncertain species movements under climate change. A series of alternative management approaches become apparent when framed by scale-sensitive, spatially explicit, context relevant and risk-consequence considerations. Evidence of the properties of mixed-species communities together with predictive frameworks for the relative importance of the ecological processes at play provide actionable pathways to a NPF in which the reality of mixed-species communities are accommodated and managed. This article is part of the theme issue 'Ecological novelty and planetary stewardship: biodiversity dynamics in a transforming biosphere'.
Collapse
Affiliation(s)
- Melodie A. McGeoch
- Securing Antarctica's Environmental Future, School of Biological Sciences, Monash University, Clayton 3800, Victoria, Australia
| | - David A. Clarke
- Securing Antarctica's Environmental Future, School of Biological Sciences, Monash University, Clayton 3800, Victoria, Australia
| | - Ninad Avinash Mungi
- Section of Ecoinformatics and Biodiversity, Department of Biology, Aarhus University, Aarhus 8000, Denmark
- Center for Ecological Dynamics in a Novel Biosphere (ECONOVO), Department of Biology, Aarhus University, Aarhus 8000, Denmark
| | - Alejandro Ordonez
- Section of Ecoinformatics and Biodiversity, Department of Biology, Aarhus University, Aarhus 8000, Denmark
- Center for Ecological Dynamics in a Novel Biosphere (ECONOVO), Department of Biology, Aarhus University, Aarhus 8000, Denmark
| |
Collapse
|
2
|
Yang X, Shen K, Xia T, He Y, Guo Y, Wu B, Han X, Yan J, Jiao M. Invasive and Native Plants Differentially Respond to Exogenous Phosphorus Addition in Root Growth and Nutrition Regulated by Arbuscular Mycorrhizal Fungi. PLANTS (BASEL, SWITZERLAND) 2023; 12:plants12112195. [PMID: 37299174 DOI: 10.3390/plants12112195] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2023] [Revised: 05/19/2023] [Accepted: 05/29/2023] [Indexed: 06/12/2023]
Abstract
Plant invasion has severely damaged ecosystem stability and species diversity worldwide. The cooperation between arbuscular mycorrhizal fungi (AMF) and plant roots is often affected by changes in the external environment. Exogenous phosphorus (P) addition can alter the root absorption of soil resources, thus regulating the root growth and development of exotic and native plants. However, it remains unclear how exogenous P addition regulates the root growth and development of exotic and native plants mediated by AMF, affecting the exotic plant invasion. In this experiment, the invasive plant Eupatorium adenophorum and native plant Eupatorium lindleyanum were selected and cultured under intraspecific (Intra-) competition and interspecific (Inter-) competition conditions, involving inoculation with (M+) and without AMF (M-) and three different levels of P addition including no addition (P0), addition with 15 mg P kg-1 soil (P15), and addition with 25 mg P kg-1 soil (P25) for the two species. Root traits of the two species were analyzed to study the response of the two species' roots to AMF inoculation and P addition. The results showed that AMF significantly promoted the root biomass, length, surface area, volume, tips, branching points, and carbon (C), nitrogen (N), and P accumulation of the two species. Under M+ treatment, the Inter- competition decreased the root growth and nutrient accumulation of invasive E. adenophorum but increased the root growth and nutrient accumulation of native E. lindleyanum relative to the Intra- competition. Meanwhile, the exotic and native plants responded differently to P addition, exhibiting root growth and nutrient accumulation of invasive E. adenophorum increased with P addition, whereas native E. lindleyanum reduced with P addition. Further, the root growth and nutrition accumulation of native E. lindleyanum were higher than invasive E. adenophorum under Inter- competition. In conclusion, exogenous P addition promoted the invasive plant but reduced the native plant in root growth and nutrient accumulation regulated by AMF, although the native plant outcompeted the invasive plant when the two species competed. The findings provide a critical perspective that the anthropogenic P fertilizer addition might potentially contribute to the successful invasion of exotic plants.
Collapse
Affiliation(s)
- Xionggui Yang
- Forestry College, Research Center of Forest Ecology, Guizhou University, Guiyang 550025, China
| | - Kaiping Shen
- Forestry College, Research Center of Forest Ecology, Guizhou University, Guiyang 550025, China
| | - Tingting Xia
- Forestry College, Research Center of Forest Ecology, Guizhou University, Guiyang 550025, China
| | - Yuejun He
- Forestry College, Research Center of Forest Ecology, Guizhou University, Guiyang 550025, China
| | - Yun Guo
- Forestry College, Research Center of Forest Ecology, Guizhou University, Guiyang 550025, China
- College of Eco-Environmental Engineering, Guizhou Minzu University, Guiyang 550025, China
| | - Bangli Wu
- Forestry College, Research Center of Forest Ecology, Guizhou University, Guiyang 550025, China
| | - Xu Han
- Forestry College, Research Center of Forest Ecology, Guizhou University, Guiyang 550025, China
| | - Jiawei Yan
- Forestry College, Research Center of Forest Ecology, Guizhou University, Guiyang 550025, China
| | - Min Jiao
- Forestry College, Research Center of Forest Ecology, Guizhou University, Guiyang 550025, China
| |
Collapse
|
3
|
Matos FAR, Edwards DP, S. Magnago LF, Heringer G, Viana Neri A, Buttschardt T, Dudeque Zenni R, Tavares de Menezes LF, Zamborlini Saiter F, Reynaud Schaefer CEG, Vieira Hissa Safar N, Pacheco Da Silva M, Simonelli M, Martins SV, Brancalion PHS, A. Meira-Neto JA. Invasive alien acacias rapidly stock carbon, but threaten biodiversity recovery in young second-growth forests. Philos Trans R Soc Lond B Biol Sci 2023; 378:20210072. [PMID: 36373928 PMCID: PMC9661951 DOI: 10.1098/rstb.2021.0072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Accepted: 10/14/2021] [Indexed: 11/16/2022] Open
Abstract
Under the UN-Decade of Ecosystem Restoration and Bonn Challenge, second-growth forest is promoted as a global solution to climate change, degradation and associated losses of biodiversity and ecosystem services. Second growth is often invaded by alien tree species and understanding how this impacts carbon stock and biodiversity recovery is key for restoration planning. We assessed carbon stock and tree diversity recovery in second growth invaded by two Acacia species and non-invaded second growth, with associated edge effects, in the Brazilian Atlantic Forest. Carbon stock recovery in non-invaded forests was threefold lower than in invaded forests. Increasingly isolated, fragmented and deforested areas had low carbon stocks when non-invaded, whereas the opposite was true when invaded. Non-invaded forests recovered threefold to sixfold higher taxonomic, phylogenetic and functional diversity than invaded forest. Higher species turnover and lower nestedness in non-invaded than invaded forests underpinned higher abundance of threatened and endemic species in non-invaded forest. Non-invaded forests presented positive relationships between carbon and biodiversity, whereas in the invaded forests we did not detect any relationship, indicating that more carbon does not equal more biodiversity in landscapes with high vulnerability to invasive acacias. To deliver on combined climate change and biodiversity goals, restoration planning and management must consider biological invasion risk. This article is part of the theme issue 'Understanding forest landscape restoration: reinforcing scientific foundations for the UN Decade on Ecosystem Restoration'.
Collapse
Affiliation(s)
- Fabio A. R. Matos
- Laboratory of Ecology and Evolution of Plants (LEEP), Botany graduate program (PPGBot), Departamento de Biologia Vegetal, Universidade Federal de Viçosa (UFV), Viçosa, Minas Gerais, CEP: 36.570-000, Brazil
- Federal University of Espírito Santo (CEUNES/DCAB), BR 101 Norte, Km 60 - Bairro Litorâneo, São Mateus, Espírito Santo, CEP: 29.932-900, Brazil
- Department of Animal and Plant Sciences, University of Sheffield, Sheffield, S10 2TN, UK
| | - David P. Edwards
- Department of Animal and Plant Sciences, University of Sheffield, Sheffield, S10 2TN, UK
| | - Luiz Fernando S. Magnago
- Programa de Pós-Graduação em Ecologia Aplicada, Departamento de Ecologia e Conservação, Instituto de Ciências Naturais, Universidade Federal de Lavras, CEP: 37.200-900, Lavras, MG, Brazil
| | - Gustavo Heringer
- Laboratory of Ecology and Evolution of Plants (LEEP), Botany graduate program (PPGBot), Departamento de Biologia Vegetal, Universidade Federal de Viçosa (UFV), Viçosa, Minas Gerais, CEP: 36.570-000, Brazil
- Institute of Landscape Ecology—ILÖK, University of Münster, D-48149 Münster, Germany
| | - Andreza Viana Neri
- Laboratory of Ecology and Evolution of Plants (LEEP), Botany graduate program (PPGBot), Departamento de Biologia Vegetal, Universidade Federal de Viçosa (UFV), Viçosa, Minas Gerais, CEP: 36.570-000, Brazil
| | - Tillmann Buttschardt
- Instituto Federal do Espírito Santo, campus Cariacica, Cariacica-ES, CEP: 29.150-410, Brazil
| | - Rafael Dudeque Zenni
- Institute of Landscape Ecology—ILÖK, University of Münster, D-48149 Münster, Germany
| | - Luis Fernando Tavares de Menezes
- Federal University of Espírito Santo (CEUNES/DCAB), BR 101 Norte, Km 60 - Bairro Litorâneo, São Mateus, Espírito Santo, CEP: 29.932-900, Brazil
| | - Felipe Zamborlini Saiter
- Instituto Nacional da Mata Atlântica (INMA). Av. José Ruschi, Santa Teresa, Espírito Santo, CEP: 29.650-000, Brazil
- Department of Soil Science, Universidade Federal de Viçosa (UFV), Viçosa, Minas Gerais, CEP: 36.570-900, Brazil
| | | | - Nathália Vieira Hissa Safar
- Programa de Pós-Graduação em Botânica, Department of Plant Biology, Universidade Federal de Viçosa (UFV), Viçosa, Minas Gerais, CEP: 36.570-900, Brazil
| | - Mônica Pacheco Da Silva
- Instituto Federal do Norte de Minas Gerais, Departamento de Biologia Geral, Januária, MG, CEP: 39.480-000, Brazil
| | - Marcelo Simonelli
- Instituto Federal do Espírito Santo, campus Vitória, Vitória - ES, CEP: 29.056-264, Brazil
| | - Sebastião V. Martins
- Department of Forest Engineering, Universidade Federal de Viçosa, Viçosa, CEP: 36.570-900 Brazil
| | - Pedro Henrique Santin Brancalion
- Department of Forest Sciences, “Luiz de Queiroz” College of Agriculture, University of São Paulo, Piracicaba, CEP: 13.418-900, Brazil
| | - João Augusto A. Meira-Neto
- Laboratory of Ecology and Evolution of Plants (LEEP), Botany graduate program (PPGBot), Departamento de Biologia Vegetal, Universidade Federal de Viçosa (UFV), Viçosa, Minas Gerais, CEP: 36.570-000, Brazil
| |
Collapse
|
4
|
Santamarina S, Montesinos D, Alfaro‐Saiz E, Acedo C. Drought affects the performance of native oak seedlings more strongly than competition with invasive crested wattle seedlings. PLANT BIOLOGY (STUTTGART, GERMANY) 2022; 24:1297-1305. [PMID: 35344631 PMCID: PMC10078637 DOI: 10.1111/plb.13416] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Accepted: 03/01/2022] [Indexed: 06/14/2023]
Abstract
Two of the most important processes threatening vulnerable plant species are competitive displacement by invasive alien species and water stress due to global warming. Quercus lusitanica, an oak shrub species with remarkable conservation interest, could be threatened by the expansion of the invasive alien tree Paraserianthes lophantha. However, it is unclear how competition would interact with predicted reductions in water availability due to global climate change. We set up a full factorial experiment to examine the direct interspecific competition between P. lophantha and Q. lusitanica seedlings under control and water-limited conditions. We measured seed biomass, germination, seedling emergence, leaf relative growth rate, biomass, root/shoot ratio, predawn shoot water potential and mortality to assess the individual and combined effects of water stress and interspecific competition on both species. Our results indicate that, at seedling stage, both species experience competitive effects and responses. However, water stress exhibited a stronger overall effect than competition. Although both species responded strongly to water stress, the invasive P. lophantha exhibited significantly less drought stress than the native Q. lusitanica based on predawn shoot water potential measurements. The findings of this study suggest that the competition with invasive P. lophantha in the short term must not be dismissed, but that the long-term conservation of the native shrub Q. lusitanica could be compromised by increased drought as a result of global change. Our work sheds light on the combined effects of biological invasions and climate change that can negatively affect vulnerable plant species.
Collapse
Affiliation(s)
- S. Santamarina
- Research Team Taxonomy and Biodiversity Conservation TaCoBiDepartment of Biodiversity and Environmental ManagementUniversity of LeónLeónSpain
- Centre for Functional EcologyDepartment of Life SciencesUniversity of CoimbraCoimbraPortugal
- Present address:
Department of Biodiversity and Environmental ManagementFaculty of Biological and Environmental SciencesUniversity of LeónCampus de VegazanaLeón24071Spain
| | - D. Montesinos
- Centre for Functional EcologyDepartment of Life SciencesUniversity of CoimbraCoimbraPortugal
- Australian Tropical HerbariumJames Cook UniversitySmithfieldQueenslandAustralia
| | - E. Alfaro‐Saiz
- Research Team Taxonomy and Biodiversity Conservation TaCoBiDepartment of Biodiversity and Environmental ManagementUniversity of LeónLeónSpain
- Herbarium LEB Jaime Andrés RodríguezCRAI ExperimentalUniversity of LeónLeónSpain
| | - C. Acedo
- Research Team Taxonomy and Biodiversity Conservation TaCoBiDepartment of Biodiversity and Environmental ManagementUniversity of LeónLeónSpain
| |
Collapse
|
5
|
Ngwenya DK, Holmes PM, Geerts S, Esler KJ. Scaling up restoration efforts by simulating the effects of fire to circumvent prescribed burns when preparing restoration sites in South African fynbos ecosystems. AUSTRAL ECOL 2022. [DOI: 10.1111/aec.13258] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Duduzile K. Ngwenya
- Department of Conservation Ecology and Entomology Stellenbosch University, Private Bag X1 Matieland South Africa
- Centre of Excellence for Invasion Biology, Department of Botany and Zoology, Natural Sciences Building, Private Bag X1 Stellenbosch University Matieland South Africa
| | - Patricia M. Holmes
- Department of Conservation Ecology and Entomology Stellenbosch University, Private Bag X1 Matieland South Africa
- Centre of Excellence for Invasion Biology, Department of Botany and Zoology, Natural Sciences Building, Private Bag X1 Stellenbosch University Matieland South Africa
| | - Sjirk Geerts
- Centre of Excellence for Invasion Biology, Department of Botany and Zoology, Natural Sciences Building, Private Bag X1 Stellenbosch University Matieland South Africa
- Department of Conservation and Marine Sciences Cape Peninsula University of Technology Cape Town South Africa
| | - Karen J. Esler
- Department of Conservation Ecology and Entomology Stellenbosch University, Private Bag X1 Matieland South Africa
- Centre of Excellence for Invasion Biology, Department of Botany and Zoology, Natural Sciences Building, Private Bag X1 Stellenbosch University Matieland South Africa
| |
Collapse
|
6
|
Are Iron-Rich Calcareous Mine Sites Easily Invaded by Invasive Plant Species? DIVERSITY 2022. [DOI: 10.3390/d14110986] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Plant diversity in relatively harsh environments, such as metal-polluted areas tends to be relatively low. Invasive plants may invade harsh environments more easily than native plants. However, studies often find fewer invasive species in stressful edaphic habitats (such as serpentine soils). Those examples may represent relatively extreme conditions. Moderately stressful habitats may be more invaded given the advantages of invasive plants. We surveyed the plant diversity in four site pairs across three seasons. Sites consist of abandoned mines and reference sites. The mine sites have calcareous soils with relatively high iron, basic pH, and lower nutrients than reference sites. Results: There were 153 plant species among the four site pairs. Around 80 and 66% of species in calcareous and reference sites were introduced species respectively. Diversity varied across seasons but tended to be lower in the mine sites. One of the mines was significantly more invaded. Across sites, the number of invasive species and their abundances was not different from that of native species. Invasive plants are as capable of invading moderately stressful calcareous sites as native species, with some sites tending to be even more invaded.
Collapse
|
7
|
Minnaar IA, Hui C, Clusella-Trullas S. Jack, master or both? The invasive ladybird Harmonia axyridis performs better than a native coccinellid despite divergent trait plasticity. NEOBIOTA 2022. [DOI: 10.3897/neobiota.77.91402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The plasticity of performance traits can promote the success of biological invasions and therefore, precisely estimating trait reaction norms can help to predict the establishment and persistence of introduced species in novel habitats. Most studies focus only on a reduced set of traits and rarely include trait variability that may be vital to predicting establishment success. Here, using a split-brood full-sib design, we acclimated the globally invasive ladybird Harmonia axyridis and a native co-occurring and competing species Cheilomenes lunata to cold, medium and warm temperature regimes, and measured critical thermal limits, life-history traits, and starvation resistance. We used the conceptual framework of “Jack, Master or both” to test predictions regarding performance differences of these two species. The native C. lunata had a higher thermal plasticity of starvation resistance and a higher upper thermal tolerance than H. axyridis. By contrast, H. axyridis had a higher performance than C. lunata for preoviposition period, fecundity and adult emergence from pupae. We combined trait responses, transport duration and propagule pressure to predict the size of the populations established in a novel site following cold, medium and warm scenarios. Although C. lunata initially had a higher performance than the invasive species during transport, more individuals of H. axyridis survived in all simulated environments due to the combined life-history responses, and in particular, higher fecundity. Despite an increased starvation mortality in the warm scenario, given a sufficient propagule size, H. axyridis successfully established. This study underscores how the combination and plasticity of multiple performance traits can strongly influence establishment potential of species introduced into novel environments.
Collapse
|
8
|
Ndabankulu K, Tsvuura Z, Magadlela A. Alien invasive Leucaena leucocephala successfully acquires nutrients by investing in below-ground biomass compared to native Vachellia nilotica in nutrient-amended soils in South Africa. AOB PLANTS 2022; 14:plac026. [PMID: 35747246 PMCID: PMC9211186 DOI: 10.1093/aobpla/plac026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Accepted: 05/24/2022] [Indexed: 06/15/2023]
Abstract
Soils in grasslands and savannas of southern Africa are acidic and nutrient-poor. Legume plants, such as Vachellia nilotica and alien invasive Leucaena leucocephala, are a major component of the vegetation there. Vachellia nilotica can establish in drought-prone environments, and is invasive in high rainfall areas. Leucaena leucocephala is an emerging invasive in South Africa and is ranked among the world's 100 most invasive alien species. Alien plants can invade native habitats through their adaptability to low-resource soils, and thus can out-compete and displace native vegetation. We investigated the effects of phosphorus (P) deficiency and soil acidity on legume-microbe symbiosis, nitrogen (N) nutrition and carbon (C) growth costs of these two legumes in grassland soils. We used as inoculum and growth substrate soils collected from a long-term (>65 years) nutrient and lime-addition trial, the Veld Fertilizer Trial (VFT), located at Ukulinga Research Farm near Pietermaritzburg in South Africa. We used soils from three VFT treatments: soils fertilized with superphosphate (336 kg ha-1) applied once per year (+P), soils fertilized with superphosphate (336 kg ha-1) applied once per year with dolomitic lime (2250 kg ha-1) applied once every 5 years (P+L) and soils with no superphosphate and no dolomitic lime applications (Control). Seeds of V. nilotica and L. leucocephala were germinated and grown independently in these soils in green house conditions and harvested after 125 days for measurement of growth, legume-microbe symbiosis, N nutrition and C growth costs. Results showed that the two legumes had different growth adaptations. Vachellia nilotica grown in control soils and +P soils nodulated with various Burkholderia spp., while L. leucocephala did not nodulate in all soil treatments. Both legumes utilized for growth both atmospheric- and soil-derived N across all treatments thereby decreasing C growth costs. Vachellia nilotica grown in +P soils accumulated the most biomass and N nutrition. Leucaena leucocephala maximized specific N assimilation rates by investing in below-ground biomass accumulation in control soils. This shows that L. leucocephala possesses traits that are successful in acquiring nutrients by investing in below-ground biomass and relying on utilization of N from both the soil and the atmosphere.
Collapse
Affiliation(s)
- Khululwa Ndabankulu
- School of Life Sciences, University of KwaZulu-Natal, Westville Campus, Private Bag X54001, Durban 4000, South Africa
| | - Zivanai Tsvuura
- Centre for Functional Biodiversity, School of Life Sciences, University of KwaZulu-Natal, Pietermaritzburg Campus, Private Bag X01, Scottsville 3209, South Africa
| | | |
Collapse
|
9
|
Acacia invasion differentially impacts soil properties of two contrasting tropical lowland forests in Brunei Darussalam. JOURNAL OF TROPICAL ECOLOGY 2022. [DOI: 10.1017/s0266467422000141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Abstract
Invasive Acacia species are known to modify soil properties, although effects are often site-specific. We examined the impact of Acacia species on the soils of intact and invaded habitats of two contrasting tropical lowland rain forest types in Brunei Darussalam: heath forest (HF) and mixed dipterocarp forest (MDF). Impacts on soil properties differed between the two forest types. Overall, Acacia-invaded HF soil recorded significantly higher gravimetric water content, pH and total P, K and Ca compared to the intact HF soil. In contrast, invaded MDF soil exhibited significantly higher organic matter content and total soil N, P, K and Mg compared to its intact habitat. Acacia-invaded MDF soils were more nutrient-enriched than Acacia-invaded HF soils by the addition of threefold, threefold and fourfold total soil P, K and Mg, respectively. The positive effect of addition of total soil Ca was, however, fourfold greater in HF soil than MDF soil, indicating that the magnitude of impact on soil properties was strongly site-specific. Overall, Acacia invasion significantly impacted soil properties in nutrient-rich MDF more than those of nutrient-poor HFs, indicating a potential vulnerability of MDFs to invasion.
Collapse
|
10
|
Generalist indigenous herbivores resist alien tree invasion: Rhabdomys pumilio limits establishment of Acacia cyclops. Biol Invasions 2022. [DOI: 10.1007/s10530-022-02728-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
|
11
|
Simulated nitrogen deposition induces shifts in growth and resource-use strategies during range expansion of an invasive plant. Biol Invasions 2021. [DOI: 10.1007/s10530-021-02668-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
12
|
Sithole N, Tsvuura Z, Kirkman K, Magadlela A. Nitrogen Source Preference and Growth Carbon Costs of Leucaena leucocephala (Lam.) de Wit Saplings in South African Grassland Soils. PLANTS (BASEL, SWITZERLAND) 2021; 10:plants10112242. [PMID: 34834605 PMCID: PMC8621804 DOI: 10.3390/plants10112242] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Revised: 10/13/2021] [Accepted: 10/14/2021] [Indexed: 06/13/2023]
Abstract
Leucaena leucocephala (Fabaceae) is native to Central America and has invaded many climatic regions of the tropics. In South Africa, the species is categorized as an emerging or incipient weed used as fodder, timber, firewood and in erosion control on degraded habitats. The species is common along the eastern subtropical regions of KwaZulu-Natal (KZN) Province, where it invades grasslands, savannas and edges of forests. Soils of these ecosystems are characterized as nutrient deficient and acidic. Using a pot trial, we determined the effects of the nutrient addition treatments on microbial symbiosis, N nutrition and biomass accumulation of L. leucocephala under greenhouse conditions. After 180 days of growth, plants were harvested, and their utilization of N derived from the atmosphere and from the soil was quantified through determination of δ15N values. L. leucocephala maintained growth and N nutrition by relying on both atmospheric- and soil-derived N across all soil treatments. The NDFA was significantly higher in high P (N1 + P, N2 + P and N3 + P) soils. L. leucocephala was able to nodulate with intermediate and fast-growing strains from the Mesorhizobium and Rhizobium genus in N2 + P grown plants. This shows that L. leucocephala possesses traits that are successful in acquiring nutrients, especially in nutrient limited conditions, by establishing plant symbiosis with multiple bacteria and relying on extracting N from the soil and from the atmosphere through the symbiosis.
Collapse
Affiliation(s)
- Nonkululeko Sithole
- School of Life Sciences, College of Agriculture, Engineering and Science, University of KwaZulu-Natal, Westville Campus, Private Bag X54001, Durban 4000, South Africa;
| | - Zivanai Tsvuura
- School of Life Sciences, College of Agriculture, Engineering and Science, University of KwaZulu-Natal, Pietermaritzburg Campus, Private Bag X01, Scottsville 3209, South Africa; (Z.T.); (K.K.)
| | - Kevin Kirkman
- School of Life Sciences, College of Agriculture, Engineering and Science, University of KwaZulu-Natal, Pietermaritzburg Campus, Private Bag X01, Scottsville 3209, South Africa; (Z.T.); (K.K.)
| | - Anathi Magadlela
- School of Life Sciences, College of Agriculture, Engineering and Science, University of KwaZulu-Natal, Westville Campus, Private Bag X54001, Durban 4000, South Africa;
| |
Collapse
|
13
|
Effect of Acacia mangium Canopy on Physicochemical Characteristics and Nutrient Concentrations of the Soil at Ayer Hitam Forest Reserve, Malaysia. FORESTS 2021. [DOI: 10.3390/f12091259] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The establishment of an Acacia mangium plantation often alters physicochemical characteristics and nutrient concentrations of soils. We aimed to evaluate the invasive potential of A. mangium forest on the soil in Ayer Hitam Forest Reserve, Peninsular, Malaysia. To achieve the mentioned target, four different regions, namely, the open ground region (OG), Acacia mangium region (AM), transition region (TZ), and native forest region (NF), were selected and each of the regions was divided into six plots. Composite samples were randomly taken from subplots at 0–15 cm depth (topsoil) and 15–30 cm depth (subsoil). Some physicochemical properties such as soil moisture and texture, textural classification, bulk density and particle density, pH, electric conductivity (EC), exchangeable bases (EB) (Ca, Mg and K), cation exchange capacity (CEC), organic matter (OM), total nitrogen (TN), and available phosphorous (Av. P) were analyzed. The results of our study showed that the soil of the AM region, which was clay loam, contained clay (51%), silt (32%), and sand (16%). The chemical analysis of topsoil showed significant differences in terms of OM%, exchangeable- Ca, Mg, K (molc kg−1), N (%), gravitational water content (GWC), and Avail. P between all four regions. Additionally, the highest pH and OM of topsoil were seen in the AM region with 4.5% and 4.33%, respectively. In the subsoil, there were significant differences (p ≤ 0.01) in terms of EC (ds/m), OM (%), Exchangeable- Ca, Mg and K (cmolc kg−1), GWC, available phosphorus, and N (%) between all four regions. The highest GWC, N (%), and Ca (cmolc kg−1) were observed in the AM region with 16.00, 0.14%, and 0.64 cmolc kg−1, respectively. These results showed that A. mangium changed some soil characteristics due to its invasion potential. In summary, A. mangium showed high adaptability on degraded forest land and high ability to accumulate the soil physicochemical properties to enhance its growth.
Collapse
|
14
|
Hirsch H, Richardson DM, Pauchard A, Le Roux JJ. Genetic analyses reveal complex introduction histories for the invasive tree
Acacia dealbata
Link around the world. DIVERS DISTRIB 2020. [DOI: 10.1111/ddi.13186] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Affiliation(s)
- Heidi Hirsch
- Centre for Invasion Biology Department of Botany and Zoology Stellenbosch University Matieland South Africa
| | - David M. Richardson
- Centre for Invasion Biology Department of Botany and Zoology Stellenbosch University Matieland South Africa
| | - Aníbal Pauchard
- Laboratorio de Invasiones Biológicas Facultad de Ciencias Forestales Universidad de Concepción Concepción Chile
- Institute of Ecology and Biodiversity (IEB) Santiago Chile
| | - Johannes J. Le Roux
- Centre for Invasion Biology Department of Botany and Zoology Stellenbosch University Matieland South Africa
- Department of Biological Sciences Macquarie University Sydney NSW Australia
| |
Collapse
|
15
|
Microbial Communities in the Fynbos Region of South Africa: What Happens during Woody Alien Plant Invasions. DIVERSITY 2020. [DOI: 10.3390/d12060254] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The Cape Floristic Region (CFR) is globally known for its plant biodiversity, and its flora is commonly referred to as fynbos. At the same time, this area is under severe pressure from urbanization, agricultural expansion and the threat of invasive alien plants. Acacia, Eucalyptus and Pinus are the common invasive alien plants found across the biome and considerable time, effort and resources are put into the removal of invasive alien plants and the rehabilitation of native vegetation. Several studies have shown that invasion not only affects the composition of plant species, but also has a profound effect on the soil chemistry and microbial populations. Over the last few years, a number of studies have shown that the microbial populations of the CFR are unique to the area, and harbour many endemic species. The extent of the role they play in the invasion process is, however, still unclear. This review aims to provide an insight into the current knowledge on the different microbial populations from this system, and speculate what their role might be during invasion. More importantly, it places a spotlight on the lack of information about this process.
Collapse
|
16
|
Morris TL, Barger NN, Cramer MD. Ecophysiological traits of invasive alien Acacia cyclops
compared to co-occuring native species in Strandveld vegetation of the Cape Floristic Region. AUSTRAL ECOL 2019. [DOI: 10.1111/aec.12827] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Taryn L. Morris
- Department of Ecology and Evolutionary Biology; University of Colorado; Boulder Colorado USA
- Department of Biological Sciences; University of Cape Town; Private Bag X3 Rondebosch 7701 South Africa
| | - Nichole N. Barger
- Department of Ecology and Evolutionary Biology; University of Colorado; Boulder Colorado USA
| | - Michael D. Cramer
- Department of Biological Sciences; University of Cape Town; Private Bag X3 Rondebosch 7701 South Africa
| |
Collapse
|
17
|
Redmond MD, Morris TL, Cramer MC. The cost of standing tall: wood nutrients associated with tree invasions in nutrient‐poor fynbos soils of South Africa. Ecosphere 2019. [DOI: 10.1002/ecs2.2831] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Miranda D. Redmond
- Department of Forest and Rangeland Stewardship Colorado State University Fort Collins Colorado 80523 USA
| | - Taryn L. Morris
- Department of Biological Sciences University of Cape Town Private Bag X1 Rondebosch 7701 South Africa
| | - Michael C. Cramer
- Department of Biological Sciences University of Cape Town Private Bag X1 Rondebosch 7701 South Africa
| |
Collapse
|
18
|
Ehmig M, Coiro M, Linder HP. Ecophysiological strategy switch through development in heteroblastic species of mediterranean ecosystems - an example in the African Restionaceae. ANNALS OF BOTANY 2019; 123:611-623. [PMID: 30475945 PMCID: PMC6417474 DOI: 10.1093/aob/mcy194] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2018] [Accepted: 10/19/2018] [Indexed: 06/09/2023]
Abstract
BACKGROUND AND AIMS Heteroblasty is a non-reversible morphological change associated with life stage change and has been linked to predictable environmental variation. It is present in several clades from mediterranean-type climates, such as African Restionaceae (restios). These have heteroblastic shoots: juvenile shoots are thin, branched and sterile (sterile shoots); adult shoots are thicker and less branched, and bear inflorescences (reproductive shoots). Ten per cent of the restios retain juvenile-like, sterile shoots as adults (neoteny). We hypothesize (1) that the two shoot types differ in ecophysiological attributes, and (2) that these shoot types (and the neoteny) are associated with different environments. METHODS We measured shoot mass per surface area (SMA), maximum photosynthetic capacity per biomass (Amass) and chlorenchyma to ground tissue ratio (CGR) of both shoot types in 14 restio species. We also calculated environmental niche overlap between neotenous and non-neotenous species using an improved multidimensional overlap function based on occurrence data, and linked shoot types with environments using a phylogenetic generalized linear model. KEY RESULTS Sterile shoots showed higher Amass, lower SMA and higher CGR than reproductive shoots. Neotenous and non-neotenous species overlapped ecologically less than expected by chance: neotenous species favoured more mesic, non-seasonal conditions. CONCLUSIONS We associate sterile shoot morphology with acquisitive ecophysiological strategies and reproductive shoots with conservative strategies. The heteroblastic switch optimizes carbon efficiency in the juvenile phase (by sterile shoots) in the mesic post-fire conditions. The adult shoots present a compromise between a more conservative strategy favourable under harsher conditions and reproductive success. Heteroblasty in seasonally arid, oligotrophic ecosystems with predictable, fire-driven shifts in water and nutrient availability might play a role in the success of restios and other species-rich lineages in mediterranean-type ecosystems. It may represent a previously unrecognized adaptation in mediterranean clades sharing similar conditions, contributing to their ecological and taxonomic dominance.
Collapse
Affiliation(s)
- Merten Ehmig
- Department of Systematic and Evolutionary Botany, University of Zurich, Zurich, Switzerland
| | - Mario Coiro
- Department of Systematic and Evolutionary Botany, University of Zurich, Zurich, Switzerland
| | - H Peter Linder
- Department of Systematic and Evolutionary Botany, University of Zurich, Zurich, Switzerland
| |
Collapse
|
19
|
Yapi TS, O’Farrell PJ, Dziba LE, Esler KJ. Alien tree invasion into a South African montane grassland ecosystem: impact of Acacia species on rangeland condition and livestock carrying capacity. INTERNATIONAL JOURNAL OF BIODIVERSITY SCIENCE, ECOSYSTEM SERVICES & MANAGEMENT 2018. [DOI: 10.1080/21513732.2018.1450291] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022] Open
Affiliation(s)
- Thozamile Steve Yapi
- Department of Conservation Ecology & Entomology, Stellenbosch University, Matieland, South Africa
- Natural Resources and the Environment, Council for Scientific and Industrial Research, Stellenbosch, South Africa
| | - Patrick J. O’Farrell
- Natural Resources and the Environment, Council for Scientific and Industrial Research, Stellenbosch, South Africa
- Percy FitzPatrick Institute of African Ornithology, University of Cape Town, Rondebosch, South Africa
| | - Luthando E. Dziba
- Natural Resources and the Environment, Council for Scientific and Industrial Research, Pretoria, South Africa
| | - Karen J. Esler
- Department of Conservation Ecology & Entomology, Stellenbosch University, Matieland, South Africa
- Centre for Invasion Biology, Stellenbosch University, Matieland, South Africa
| |
Collapse
|
20
|
Estimating Invasion Success by Non-Native Trees in a National Park Combining WorldView-2 Very High Resolution Satellite Data and Species Distribution Models. DIVERSITY 2017. [DOI: 10.3390/d9010006] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
21
|
Gordon CE, Price OF, Tasker EM, Denham AJ. Acacia shrubs respond positively to high severity wildfire: Implications for conservation and fuel hazard management. THE SCIENCE OF THE TOTAL ENVIRONMENT 2017; 575:858-868. [PMID: 27692936 DOI: 10.1016/j.scitotenv.2016.09.129] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2016] [Revised: 09/16/2016] [Accepted: 09/16/2016] [Indexed: 06/06/2023]
Abstract
High severity wildfires pose threats to human assets, but are also perceived to impact vegetation communities because a small number of species may become dominant immediately after fire. However there are considerable gaps in our knowledge about species-specific responses of plants to different fire severities, and how this influences fuel hazard in the short and long-term. Here we conduct a floristic survey at sites before and two years after a wildfire of unprecedented size and severity in the Warrumbungle National Park (Australia) to explore relationships between post-fire growth of a fire responsive shrub genera (Acacia), total mid-story vegetation cover, fire severity and fuel hazard. We then survey 129 plots surrounding the park to assess relationships between mid-story vegetation cover and time-since-fire. Acacia species richness and cover were 2.3 and 4.3 times greater at plots after than before the fire. However the same common dominant species were present throughout the study. Mid-story vegetation cover was 1.5 times greater after than before the wildfire, and Acacia species contribution to mid-story cover increased from 10 to 40%. Acacia species richness was not affected by fire severity, however strong positive associations were observed between Acacia and total mid-story vegetation cover and severity. Our analysis of mid-story vegetation recovery showed that cover was similarly high between 2 and 30years post-fire, then decreased until 52years. Collectively, our results suggest that Acacia species are extremely resilient to high severity wildfire and drive short to mid-term increases in fuel hazard. Our results are discussed in relation to fire regime management from the twin perspectives of conserving biodiversity and mitigating human losses due to wildfire.
Collapse
Affiliation(s)
- Christopher E Gordon
- Centre for Environmental Risk Management of Bushfires, University of Wollongong, NSW 2522, Australia.
| | - Owen F Price
- Centre for Environmental Risk Management of Bushfires, University of Wollongong, NSW 2522, Australia
| | - Elizabeth M Tasker
- Science Division, NSW Office of Environment and Heritage, Hurstville, NSW 2220, Australia
| | - Andrew J Denham
- Science Division, NSW Office of Environment and Heritage, Hurstville, NSW 2220, Australia; Centre for Sustainable Ecosystem Solutions, University of Wollongong, NSW 2522, Australia
| |
Collapse
|
22
|
Ulm F, Hellmann C, Cruz C, Máguas C. N/P imbalance as a key driver for the invasion of oligotrophic dune systems by a woody legume. OIKOS 2016. [DOI: 10.1111/oik.03810] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Florian Ulm
- Faculdade de Ciencias da Universidade de Lisboa, Centre for Ecology, Evolution and Environmental Changes; Campo Grande, C2 PT-1749-016 Lisbon Portugal
| | - Christine Hellmann
- Experimental and Systems Ecology; Univ. of Bielefeld; Bielefeld Germany
- Dept of Ecosystem Physiology; Univ. of Freiburg; Freiburg Germany
| | - Cristina Cruz
- Faculdade de Ciencias da Universidade de Lisboa, Centre for Ecology, Evolution and Environmental Changes; Campo Grande, C2 PT-1749-016 Lisbon Portugal
| | - Cristina Máguas
- Faculdade de Ciencias da Universidade de Lisboa, Centre for Ecology, Evolution and Environmental Changes; Campo Grande, C2 PT-1749-016 Lisbon Portugal
| |
Collapse
|
23
|
Erskine-Ogden J, Grotkopp E, Rejmánek M. Mediterranean, invasive, woody species grow larger than their less-invasive counterparts under potential global environmental change. AMERICAN JOURNAL OF BOTANY 2016; 103:613-624. [PMID: 27026213 DOI: 10.3732/ajb.1500494] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2015] [Accepted: 01/25/2016] [Indexed: 06/05/2023]
Abstract
PREMISE OF THE STUDY Revealing biological differences between invasive and noninvasive species is essential for predicting species' distribution changes with global environmental change. While most research has focused on differences between invasive and noninvasive species under favorable conditions using herbaceous species, invasive woody angiosperms are also of great ecological concern. Our study focused on how growth and allocation may change for invasive and noninvasive, mediterranean, woody angiosperms under future conditions caused by global change, specifically increased nitrogen deposition and drought. METHODS We tested how seedling functional traits differed between invasive and noninvasive woody angiosperms under different experimental conditions in a greenhouse setting. We compared growth rates and allocation patterns using two levels of soil nitrogen and three levels of watering. We also examined trait log response ratios to increases in nitrogen and increases in water. Our study sampled angiosperm trees and shrubs, incorporating congeneric/confamilial relationships through 13 phylogenetically controlled contrasts. KEY RESULTS Three functional traits were highly and positively associated with plant invasiveness for most conditions studied: seedling plant mass, leaf area, and height. Invasive species also had significantly higher root mass ratios at low water regardless of nitrogen input. Invasive and noninvasive species had similar log response ratios to increases in nitrogen and watering for studied traits. CONCLUSIONS Mediterranean, woody, invasive species' larger mass, leaf area, and early height advantage under elevated nitrogen input and increased root production in drought conditions may lead to increased invasion of these species with expected global climate change.
Collapse
Affiliation(s)
- Jennifer Erskine-Ogden
- Department of Evolution and Ecology, University of California, Davis, California 95616 USA
| | - Eva Grotkopp
- Department of Evolution and Ecology, University of California, Davis, California 95616 USA
| | - Marcel Rejmánek
- Department of Evolution and Ecology, University of California, Davis, California 95616 USA
| |
Collapse
|
24
|
The impact of black wattle encroachment of indigenous grasslands on soil carbon, Eastern Cape, South Africa. Biol Invasions 2015. [DOI: 10.1007/s10530-015-1017-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
25
|
Competitive resistance of a native shrubland to invasion by the alien invasive tree species, Acacia cyclops. Biol Invasions 2015. [DOI: 10.1007/s10530-015-0978-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
26
|
Le Maitre DC, Gush MB, Dzikiti S. Impacts of invading alien plant species on water flows at stand and catchment scales. AOB PLANTS 2015; 7:plv043. [PMID: 25935861 PMCID: PMC4480063 DOI: 10.1093/aobpla/plv043] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2014] [Accepted: 03/26/2015] [Indexed: 06/04/2023]
Abstract
There have been many studies of the diverse impacts of invasions by alien plants but few have assessed impacts on water resources. We reviewed the information on the impacts of invasions on surface runoff and groundwater resources at stand to catchment scales and covering a full annual cycle. Most of the research is South African so the emphasis is on South Africa's major invaders with data from commercial forest plantations where relevant. Catchment studies worldwide have shown that changes in vegetation structure and the physiology of the dominant plant species result in changes in surface runoff and groundwater discharge, whether they involve native or alien plant species. Where there is little change in vegetation structure [e.g. leaf area (index), height, rooting depth and seasonality] the effects of invasions generally are small or undetectable. In South Africa, the most important woody invaders typically are taller and deeper rooted than the native species. The impacts of changes in evaporation (and thus runoff) in dryland settings are constrained by water availability to the plants and, thus, by rainfall. Where the dryland invaders are evergreen and the native vegetation (grass) is seasonal, the increases can reach 300-400 mm/year. Where the native vegetation is evergreen (shrublands) the increases are ∼200-300 mm/year. Where water availability is greater (riparian settings or shallow water tables), invading tree water-use can reach 1.5-2.0 times that of the same species in a dryland setting. So, riparian invasions have a much greater impact per unit area invaded than dryland invasions. The available data are scattered and incomplete, and there are many gaps and issues that must be addressed before a thorough understanding of the impacts at the site scale can be gained and used in extrapolating to watershed scales, and in converting changes in flows to water supply system yields.
Collapse
Affiliation(s)
- D C Le Maitre
- CSIR Natural Resources and the Environment, PO Box 320, Stellenbosch 7599, South Africa Centre for Invasion Biology, Department of Botany and Zoology, University of Stellenbosch, Private Bag X1, Matieland 7602, South Africa
| | - M B Gush
- CSIR Natural Resources and the Environment, PO Box 320, Stellenbosch 7599, South Africa
| | - S Dzikiti
- CSIR Natural Resources and the Environment, PO Box 320, Stellenbosch 7599, South Africa
| |
Collapse
|
27
|
Luo Y, Guo W, Yuan Y, Liu J, Du N, Wang R. Increased nitrogen deposition alleviated the competitive effects of the introduced invasive plant Robinia pseudoacacia on the native tree Quercus acutissima. PLANT AND SOIL 2014; 385:63-75. [DOI: 10.1007/s11104-014-2227-1] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2024]
|
28
|
Comparison of photosynthetic characteristics in cultivated and wild offspring of the invasive Callery pear (Pyrus calleryana Decne.). Biol Invasions 2014. [DOI: 10.1007/s10530-013-0528-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
29
|
Slabbert E, Jacobs SM, Jacobs K. The soil bacterial communities of South African fynbos riparian ecosystems invaded by Australian Acacia species. PLoS One 2014; 9:e86560. [PMID: 24475145 PMCID: PMC3901694 DOI: 10.1371/journal.pone.0086560] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2013] [Accepted: 12/11/2013] [Indexed: 11/30/2022] Open
Abstract
Riparian ecosystem along rivers and streams are characterised by lateral and longitudinal ecological gradients and, as a result, harbour unique biodiversity. Riparian ecosystems in the fynbos of the Western Cape, South Africa, are characterised by seasonal dynamics, with summer droughts followed by high flows during winter. The unique hydrology and geomorphology of riparian ecosystems play an important role in shaping these ecosystems. The riparian vegetation in the Western Cape has, however, largely been degraded due to the invasion of non-indigenous plants, in particular Acacia mearnsii, A. saligna and A. dealbata. This study investigated the effect of hydrology and invasion on the bacterial communities associated with fynbos riparian ecosystems. Bacterial communities were characterised with automated ribosomal intergenic spacer analysis (ARISA) and 454 16S rDNA pyrosequencing. Chemical and physical properties of soil within sites were also determined and correlated with community data. Sectioning across the lateral zones revealed significant differences in community composition, and the specific bacterial taxa influenced. Results also showed that the bacterial community structure could be linked to Acacia invasion. The presence of invasive Acacia was correlated with specific bacterial phyla. However, high similarity between cleared and pristine sites suggests that the effect of Acacia on the soil bacterial community structure may not be permanent. This study demonstrates how soil bacterial communities are influenced by hydrological gradients associated with riparian ecosystems and the impact of Acacia invasion on these communities.
Collapse
Affiliation(s)
- Etienne Slabbert
- Department of Microbiology, Stellenbosch University, Stellenbosch, Western Cape, South Africa
| | - Shayne Martin Jacobs
- Department of Conservation Ecology and Entomology, Stellenbosch University, Stellenbosch, Western Cape, South Africa
| | - Karin Jacobs
- Department of Microbiology, Stellenbosch University, Stellenbosch, Western Cape, South Africa
| |
Collapse
|
30
|
Potgieter LJ, Richardson DM, Wilson JRU. Casuarina: biogeography and ecology of an important tree genus in a changing world. Biol Invasions 2013. [DOI: 10.1007/s10530-013-0613-x] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
31
|
Hui C, Richardson DM, Visser V, Wilson JRU. Macroecology meets invasion ecology: performance of Australian acacias and eucalypts around the world revealed by features of their native ranges. Biol Invasions 2013. [DOI: 10.1007/s10530-013-0599-4] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
32
|
Funk JL. The physiology of invasive plants in low-resource environments. CONSERVATION PHYSIOLOGY 2013; 1:cot026. [PMID: 27293610 PMCID: PMC4806624 DOI: 10.1093/conphys/cot026] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2013] [Revised: 07/29/2013] [Accepted: 08/28/2013] [Indexed: 05/03/2023]
Abstract
While invasive plant species primarily occur in disturbed, high-resource environments, many species have invaded ecosystems characterized by low nutrient, water, and light availability. Species adapted to low-resource systems often display traits associated with resource conservation, such as slow growth, high tissue longevity, and resource-use efficiency. This contrasts with our general understanding of invasive species physiology derived primarily from studies in high-resource environments. These studies suggest that invasive species succeed through high resource acquisition. This review examines physiological and morphological traits of native and invasive species in low-resource environments. Existing data support the idea that species invading low-resource environments possess traits associated with resource acquisition, resource conservation or both. Disturbance and climate change are affecting resource availability in many ecosystems, and understanding physiological differences between native and invasive species may suggest ways to restore invaded ecosystems.
Collapse
Affiliation(s)
- Jennifer L. Funk
- School of Earth and Environmental Sciences, Chapman University, Orange, CA 92866, USA
| |
Collapse
|
33
|
Plant-soil feedbacks do not explain invasion success of Acacia species in introduced range populations in Australia. Biol Invasions 2013. [DOI: 10.1007/s10530-013-0478-z] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
34
|
Cooke SJ, Sack L, Franklin CE, Farrell AP, Beardall J, Wikelski M, Chown SL. What is conservation physiology? Perspectives on an increasingly integrated and essential science(†). CONSERVATION PHYSIOLOGY 2013; 1:cot001. [PMID: 27293585 PMCID: PMC4732437 DOI: 10.1093/conphys/cot001] [Citation(s) in RCA: 244] [Impact Index Per Article: 22.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2013] [Accepted: 01/28/2013] [Indexed: 05/20/2023]
Abstract
Globally, ecosystems and their constituent flora and fauna face the localized and broad-scale influence of human activities. Conservation practitioners and environmental managers struggle to identify and mitigate threats, reverse species declines, restore degraded ecosystems, and manage natural resources sustainably. Scientific research and evidence are increasingly regarded as the foundation for new regulations, conservation actions, and management interventions. Conservation biologists and managers have traditionally focused on the characteristics (e.g. abundance, structure, trends) of populations, species, communities, and ecosystems, and simple indicators of the responses to environmental perturbations and other human activities. However, an understanding of the specific mechanisms underlying conservation problems is becoming increasingly important for decision-making, in part because physiological tools and knowledge are especially useful for developing cause-and-effect relationships, and for identifying the optimal range of habitats and stressor thresholds for different organisms. When physiological knowledge is incorporated into ecological models, it can improve predictions of organism responses to environmental change and provide tools to support management decisions. Without such knowledge, we may be left with simple associations. 'Conservation physiology' has been defined previously with a focus on vertebrates, but here we redefine the concept universally, for application to the diversity of taxa from microbes to plants, to animals, and to natural resources. We also consider 'physiology' in the broadest possible terms; i.e. how an organism functions, and any associated mechanisms, from development to bioenergetics, to environmental interactions, through to fitness. Moreover, we consider conservation physiology to include a wide range of applications beyond assisting imperiled populations, and include, for example, the eradication of invasive species, refinement of resource management strategies to minimize impacts, and evaluation of restoration plans. This concept of conservation physiology emphasizes the basis, importance, and ecological relevance of physiological diversity at a variety of scales. Real advances in conservation and resource management require integration and inter-disciplinarity. Conservation physiology and its suite of tools and concepts is a key part of the evidence base needed to address pressing environmental challenges.
Collapse
Affiliation(s)
- Steven J. Cooke
- Fish Ecology and Conservation Physiology Laboratory, Department of Biology and Institute of Environmental Science, Carleton University, 1125 Colonel By Drive, Ottawa, ON, Canada K1S 5B6
| | - Lawren Sack
- Department of Ecology and Evolution, University of California Los Angeles, 621 Charles E. Young Drive South, Los Angeles, CA 90095, USA
| | - Craig E. Franklin
- School of Biological Sciences, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Anthony P. Farrell
- Department of Zoology and Faculty of Land and Food Systems, University of British Columbia, 6270 University Boulevard, Vancouver, BC, Canada V6T 1Z4
| | - John Beardall
- School of Biological Sciences, Monash University, Victoria 3800, Australia
| | - Martin Wikelski
- Max Plank Institute of Ornithology, D-78315 Radolfzell, Germany
| | - Steven L. Chown
- School of Biological Sciences, Monash University, Victoria 3800, Australia
| |
Collapse
|
35
|
Sardans J, Peñuelas J. The role of plants in the effects of global change on nutrient availability and stoichiometry in the plant-soil system. PLANT PHYSIOLOGY 2012; 160:1741-61. [PMID: 23115250 PMCID: PMC3510107 DOI: 10.1104/pp.112.208785] [Citation(s) in RCA: 125] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2012] [Accepted: 10/29/2012] [Indexed: 05/21/2023]
Affiliation(s)
- Jordi Sardans
- Consejo Superior de Investigaciones Científicas, Global Ecology Unit, Centre de Recerca Ecològica i Aplicacions Forestats-Centre d'Estudis Avançats de Blanes-Universitat Autònoma de Barcelona, Cerdanyola del Vallès 08913, Catalonia, Spain.
| | | |
Collapse
|
36
|
Drenovsky RE, Grewell BJ, D'Antonio CM, Funk JL, James JJ, Molinari N, Parker IM, Richards CL. A functional trait perspective on plant invasion. ANNALS OF BOTANY 2012; 110:141-53. [PMID: 22589328 PMCID: PMC3380596 DOI: 10.1093/aob/mcs100] [Citation(s) in RCA: 138] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
BACKGROUND AND AIMS Global environmental change will affect non-native plant invasions, with profound potential impacts on native plant populations, communities and ecosystems. In this context, we review plant functional traits, particularly those that drive invader abundance (invasiveness) and impacts, as well as the integration of these traits across multiple ecological scales, and as a basis for restoration and management. SCOPE We review the concepts and terminology surrounding functional traits and how functional traits influence processes at the individual level. We explore how phenotypic plasticity may lead to rapid evolution of novel traits facilitating invasiveness in changing environments and then 'scale up' to evaluate the relative importance of demographic traits and their links to invasion rates. We then suggest a functional trait framework for assessing per capita effects and, ultimately, impacts of invasive plants on plant communities and ecosystems. Lastly, we focus on the role of functional trait-based approaches in invasive species management and restoration in the context of rapid, global environmental change. CONCLUSIONS To understand how the abundance and impacts of invasive plants will respond to rapid environmental changes it is essential to link trait-based responses of invaders to changes in community and ecosystem properties. To do so requires a comprehensive effort that considers dynamic environmental controls and a targeted approach to understand key functional traits driving both invader abundance and impacts. If we are to predict future invasions, manage those at hand and use restoration technology to mitigate invasive species impacts, future research must focus on functional traits that promote invasiveness and invader impacts under changing conditions, and integrate major factors driving invasions from individual to ecosystem levels.
Collapse
Affiliation(s)
- Rebecca E Drenovsky
- Biology Department, John Carroll University, University Heights, OH 44118-4581, USA.
| | | | | | | | | | | | | | | |
Collapse
|
37
|
Birnbaum C, Barrett LG, Thrall PH, Leishman MR. Mutualisms are not constraining cross-continental invasion success of Acacia species within Australia. DIVERS DISTRIB 2012. [DOI: 10.1111/j.1472-4642.2012.00920.x] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Affiliation(s)
- Christina Birnbaum
- Department of Biological Sciences; Macquarie University; North Ryde; NSW; 2109; Australia
| | - Luke G. Barrett
- CSIRO Plant Industry; GPO Box 1600; Canberra; ACT; 2601; Australia
| | - Peter H. Thrall
- CSIRO Plant Industry; GPO Box 1600; Canberra; ACT; 2601; Australia
| | - Michelle R. Leishman
- Department of Biological Sciences; Macquarie University; North Ryde; NSW; 2109; Australia
| |
Collapse
|
38
|
Morais MC, Panuccio MR, Muscolo A, Freitas H. Salt tolerance traits increase the invasive success of Acacia longifolia in Portuguese coastal dunes. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2012; 55:60-5. [PMID: 22543107 DOI: 10.1016/j.plaphy.2012.03.013] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2012] [Accepted: 03/21/2012] [Indexed: 05/15/2023]
Abstract
Salt tolerance of two co-occurring legumes in coastal areas of Portugal, a native species--Ulex europaeus, and an invasive species--Acacia longifolia, was evaluated in relation to plant growth, ion content and antioxidant enzyme activities. Plants were submitted to four concentrations of NaCl (0, 50, 100 and 200 mM) for three months, under controlled conditions. The results showed that NaCl affects the growth of both species in different ways. Salt stress significantly reduced the plant height and the dry weight in Acacia longifolia whereas in U. europaeus the effect was not significant. Under salt stress, the root:shoot ratio (W(R):W(S)) and root mass ratio (W(R):W(RS)) increased as a result of increasing salinity in A. longifolia but the same was not observed in U. europaeus. In addition, salt stress caused a significant accumulation of Na+, especially in U. europaeus, and a decrease in K+ content and K+/Na+ ratio. The activities of antioxidant enzymes were higher in A. longifolia compared to U. europaeus. In A. longifolia, catalase (CAT, EC 1.11.1.6) and glutathione reductase (GR, EC 1.6.4.2.) activities increased significantly, while ascorbate peroxidase (APX, EC 1.11.1.11) and peroxidase (POX, EC 1.11.1.7) activities remained unchanged in comparison with the control. In U. europaeus, NaCl concentration significantly reduced APX activity but did not significantly affect CAT, GR and POX activities. Our results suggest that the invasive species copes better with salinity stress in part due to a higher rates of CAT and GR activities and a higher K+/Na+ ratio, which may represent an additional advantage when competing with native species in co-occurring salty habitats.
Collapse
Affiliation(s)
- Maria Cristina Morais
- Centre for Functional Ecology, Department of Life Sciences, University of Coimbra, P.O. Box 3046, 3001-401 Coimbra, Portugal.
| | | | | | | |
Collapse
|
39
|
When should exotic forest plantation tree species be considered as an invasive threat and how should we treat them? Biol Invasions 2012. [DOI: 10.1007/s10530-012-0202-4] [Citation(s) in RCA: 76] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
40
|
Rascher KG, Hellmann C, Máguas C, Werner C. Community scale 15N isoscapes: tracing the spatial impact of an exotic N2-fixing invader. Ecol Lett 2012; 15:484-91. [DOI: 10.1111/j.1461-0248.2012.01761.x] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
41
|
Drought-tolerance of an invasive alien tree, Acacia mearnsii and two native competitors in fynbos riparian ecotones. Biol Invasions 2011. [DOI: 10.1007/s10530-011-0103-y] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
42
|
Wilson JRU, Gairifo C, Gibson MR, Arianoutsou M, Bakar BB, Baret S, Celesti-Grapow L, DiTomaso JM, Dufour-Dror JM, Kueffer C, Kull CA, Hoffmann JH, Impson FAC, Loope LL, Marchante E, Marchante H, Moore JL, Murphy DJ, Tassin J, Witt A, Zenni RD, Richardson DM. Risk assessment, eradication, and biological control: global efforts to limit Australian acacia invasions. DIVERS DISTRIB 2011. [DOI: 10.1111/j.1472-4642.2011.00815.x] [Citation(s) in RCA: 139] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
|
43
|
Richardson DM, Carruthers J, Hui C, Impson FAC, Miller JT, Robertson MP, Rouget M, Le Roux JJ, Wilson JRU. Human-mediated introductions of Australian acacias - a global experiment in biogeography. DIVERS DISTRIB 2011. [DOI: 10.1111/j.1472-4642.2011.00824.x] [Citation(s) in RCA: 191] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
|
44
|
Le Maitre DC, Gaertner M, Marchante E, Ens EJ, Holmes PM, Pauchard A, O’Farrell PJ, Rogers AM, Blanchard R, Blignaut J, Richardson DM. Impacts of invasive Australian acacias: implications for management and restoration. DIVERS DISTRIB 2011. [DOI: 10.1111/j.1472-4642.2011.00816.x] [Citation(s) in RCA: 261] [Impact Index Per Article: 20.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
|