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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
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Adedoja O, Erckie L, Boatwright JS, van Wyk E, Geerts S. An invasive alien Proteaceae lures some, but not all nectar-feeding bird pollinators away from native Proteaceae in South African fynbos. PLANT BIOLOGY (STUTTGART, GERMANY) 2021; 23:915-922. [PMID: 34396663 DOI: 10.1111/plb.13300] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Accepted: 05/27/2021] [Indexed: 06/13/2023]
Abstract
Invasive alien plants often influence pollinator visitation to native plants when sharing pollinator guilds. It is of conservation concern when the invasive alien plant is characterized by floral resources that attract pollinators, thereby reducing the reproductive success of native species. This is well studied for insects, but whether the same is true for bird pollinators is largely unknown. We address this by considering the impact of an invasive alien plant (Banksia speciosa) on visitation rates of nectar-feeding bird pollinators to native Protea compacta in the Cape Floristic Region of South Africa. We determined bird pollinator visitation rate to B. speciosa and P. compacta over 21 h of observation at three sites. We also quantified how visitation rate influenced reproductive success of both study species through different breeding experiments. Sugarbird visitation to P. compacta was significantly lower in the presence of B. speciosa, while there was no effect for sunbirds as they mostly avoided B. speciosa. Protea compacta had higher nectar volumes and sucrose per flower than B. speciosa. Sucrose per hectare was higher in all P. compacta plots compared to B. speciosa. Neither study species is pollen limited and they are self-compatible to some extent. But pollinator visitation enhanced seed production in both species. We show here that the invasive alien B. speciosa flowers attract sugarbirds - but not sunbirds - away from native P. compacta. The long-term effect of reduced pollinator visitation may reduce the fitness of P. compacta, but the long-term demographic impact is unknown and would require further study.
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Affiliation(s)
- O Adedoja
- Department of Conservation and Marine Sciences, Cape Peninsula University of Technology, Cape Town, South Africa
| | - L Erckie
- Department of Biodiversity and Conservation Biology, University of the Western Cape, Cape Town, South Africa
| | - J S Boatwright
- Department of Biodiversity and Conservation Biology, University of the Western Cape, Cape Town, South Africa
| | - E van Wyk
- South African National Biodiversity Institute, Cape Town, South Africa
- Institute for Coastal and Marine Research, Nelson Mandela University, Gqeberha, South Africa
| | - S Geerts
- Department of Conservation and Marine Sciences, Center for Invasion Biology, Cape Peninsula University of Technology, Cape Town, South Africa
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Holmes PM, Esler KJ, van Wilgen BW, Richardson DM. Ecological restoration of ecosystems degraded by invasive alien plants in South African Fynbos: Is spontaneous succession a viable strategy? ACTA ACUST UNITED AC 2020. [DOI: 10.1080/0035919x.2020.1781291] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Patricia M. Holmes
- Centre for Invasion Biology, Department of Conservation Ecology and Entomology, Stellenbosh University, Private Bag X1, Matieland, 7602, South Africa
| | - Karen J. Esler
- Centre for Invasion Biology, Department of Conservation Ecology and Entomology, Stellenbosh University, Private Bag X1, Matieland, 7602, South Africa
| | - Brian W. van Wilgen
- Centre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa
| | - David M. Richardson
- Centre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa
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Novoa A, Shackleton R, Canavan S, Cybèle C, Davies SJ, Dehnen-Schmutz K, Fried J, Gaertner M, Geerts S, Griffiths CL, Kaplan H, Kumschick S, Le Maitre DC, Measey GJ, Nunes AL, Richardson DM, Robinson TB, Touza J, Wilson JRU. A framework for engaging stakeholders on the management of alien species. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2018; 205:286-297. [PMID: 29024897 DOI: 10.1016/j.jenvman.2017.09.059] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2016] [Revised: 09/20/2017] [Accepted: 09/21/2017] [Indexed: 05/28/2023]
Abstract
Alien species can have major ecological and socioeconomic impacts in their novel ranges and so effective management actions are needed. However, management can be contentious and create conflicts, especially when stakeholders who benefit from alien species are different from those who incur costs. Such conflicts of interests mean that management strategies can often not be implemented. There is, therefore, increasing interest in engaging stakeholders affected by alien species or by their management. Through a facilitated workshop and consultation process including academics and managers working on a variety of organisms and in different areas (urban and rural) and ecosystems (terrestrial and aquatic), we developed a framework for engaging stakeholders in the management of alien species. The proposed framework for stakeholder engagement consists of 12 steps: (1) identify stakeholders; (2) select key stakeholders for engagement; (3) explore key stakeholders' perceptions and develop initial aims for management; (4) engage key stakeholders in the development of a draft management strategy; (5) re-explore key stakeholders' perceptions and revise the aims of the strategy; (6) co-design general aims, management objectives and time frames with key stakeholders; (7) co-design a management strategy; (8) facilitate stakeholders' ownership of the strategy and adapt as required; and (9) implement the strategy and monitor management actions to evaluate the need for additional or future actions. In case additional management is needed after these actions take place, some extra steps should be taken: (10) identify any new stakeholders, benefits, and costs; (11) monitor engagement; and (12) revise management strategy. Overall, we believe that our framework provides an effective approach to minimize the impact of conflicts created by alien species management.
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Affiliation(s)
- Ana Novoa
- Centre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University, Matieland, South Africa; South African National Biodiversity Institute, Kirstenbosch Research Centre, Claremont, South Africa; Institute of Botany, Department of Invasion Ecology, The Czech Academy of Sciences, CZ-252 43, Průhonice, Czech Republic.
| | - Ross Shackleton
- Centre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University, Matieland, South Africa
| | - Susan Canavan
- Centre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University, Matieland, South Africa; South African National Biodiversity Institute, Kirstenbosch Research Centre, Claremont, South Africa
| | - Cathleen Cybèle
- CIRAD, UMR PVBMT, Saint-Pierre, La Réunion, France; Université de la Réunion, UMR PVBMT, F-97410, Saint-Pierre, La Réunion, France
| | - Sarah J Davies
- Centre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University, Matieland, South Africa
| | - Katharina Dehnen-Schmutz
- Centre for Agroecology, Water and Resilience, Coventry University, Ryton Gardens, Wolston Lane, Coventry, CV8 3LG, UK
| | - Jana Fried
- Centre for Agroecology, Water and Resilience, Coventry University, Ryton Gardens, Wolston Lane, Coventry, CV8 3LG, UK
| | - Mirijam Gaertner
- Centre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University, Matieland, South Africa; Nürtingen-Geislingen University of Applied Sciences (HFWU), Nürtingen, Germany
| | - Sjirk Geerts
- Department Conservation and Marine Science, Cape Peninsula University of Technology, P.O. Box 652, Cape Town, 8000, South Africa
| | - Charles L Griffiths
- Marine Research (MA-RE) Institute, University of Cape Town, Private Bag X3, Rondebosch, 7701, South Africa; Department of Biological Sciences, University of Cape Town, Private Bag X3, Rondebosch, 7701, South Africa
| | - Haylee Kaplan
- South African National Biodiversity Institute, Kirstenbosch Research Centre, Claremont, South Africa
| | - Sabrina Kumschick
- Centre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University, Matieland, South Africa; South African National Biodiversity Institute, Kirstenbosch Research Centre, Claremont, South Africa
| | - David C Le Maitre
- Council for Industrial and Scientific Research, P.O. Box 320, Stellenbosch, 7599, South Africa
| | - G John Measey
- Centre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University, Matieland, South Africa
| | - Ana L Nunes
- Centre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University, Matieland, South Africa; South African National Biodiversity Institute, Kirstenbosch Research Centre, Claremont, South Africa; South African Institute for Aquatic Biodiversity, Grahamstown, South Africa
| | - David M Richardson
- Centre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University, Matieland, South Africa
| | - Tamara B Robinson
- Centre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University, Matieland, South Africa
| | - Julia Touza
- Environment Department, Wentworth Way, University of York, Heslington, York, YO10 5NG, UK
| | - John R U Wilson
- Centre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University, Matieland, South Africa; South African National Biodiversity Institute, Kirstenbosch Research Centre, Claremont, South Africa
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