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Molecular insights into the invasion dynamics of Carcinus crabs in South Africa. Biol Invasions 2022. [DOI: 10.1007/s10530-022-02865-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
AbstractKnowledge of the introduction history and spread dynamics of invasive species can provide important insights for management (Ens et al. in Environ Rev (in press), 2022), however such information is often unavailable for accidental introductions. Here we infer how the European shore crab, Carcinus maenas, and its congener, the Mediterranean shore crab, C. aestuarii, were introduced to and spread within South Africa. We do this using nuclear microsatellite data and Bayesian assignment tests and Approximate Bayesian Computation (ABC) modelling that included samples from the native and other invasive ranges of these two species. We also compared the genetic diversity and structure of one of the South African populations during and after intensive management, with that of another, unmanaged, population. South African populations had higher genetic diversity than invasive Carcinus populations from elsewhere in the world. Moreover, the ABC analyses suggest that South African populations originated from an admixture event between individuals of C. maenas from a population in the native range and an invasive population from Canada. We also identified instances of hybridisation between Carcinus maenas and C. aestuarii in South Africa. South African populations showed no genetic structure, suggesting either extensive migration between them or that populations arose from the same initial introduction. Management of Carcinus did not affect genetic diversity or structure, and we suspect that the management duration was insufficient to target a full generation of crabs. Together these results suggest multiple introductions and/or high propagule pressure to South Africa, crab (larval or adult) movement between existing populations, and some hybridisation. For eradication from South Africa to be achieved, management would need to concurrently target all known invasive populations and clearly establish that new introductions could be prevented.
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Whitfield AK, Adams JB, Harrison TD, Lamberth SJ, Lemley DA, MacKay F, Van Niekerk L, Weyl OLF. Possible impacts of non-native plant, pathogen, invertebrate and fish taxa on the indigenous ichthyofauna in South African estuaries: a preliminary review. Biol Invasions 2021. [DOI: 10.1007/s10530-021-02541-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Diemer N, Griffiths CL, Hodgson A. Disentangling the identities and distribution patterns of the introduced beachfleasOrchestia gammarellusandPlatorchestia platensis(Crustacea: Amphipoda: Talitridae) in South Africa. AFRICAN ZOOLOGY 2016. [DOI: 10.1080/15627020.2016.1268930] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Natalie Diemer
- Department of Biological Sciences and Centre for Invasion Biology, University of Cape Town, Cape Town, South Africa
| | - Charles L Griffiths
- Department of Biological Sciences and Centre for Invasion Biology, University of Cape Town, Cape Town, South Africa
| | - Alan Hodgson
- Department of Zoology and Entomology, Rhodes University, Grahamstown, South Africa
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Wildish DJ, Smith SR, Loeza-Quintana T, Radulovici AE, Adamowicz SJ. Diversity and dispersal history of the talitrids (Crustacea: Amphipoda: Talitridae) of Bermuda. J NAT HIST 2016. [DOI: 10.1080/00222933.2016.1180719] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- D. J. Wildish
- Fisheries & Oceans Canada, Biological Station, New Brunswick, Canada
| | - S. R. Smith
- Bermuda Natural History Museum, Aquarium and Zoo, Flatt’s, Bermuda
| | - T. Loeza-Quintana
- Department of Integrative Biology & Biodiversity Institute of Ontario, University of Guelph, Guelph, Canada
| | - A. E. Radulovici
- Biodiversity Institute of Ontario, University of Guelph, Guelph, Canada
| | - S. J. Adamowicz
- Department of Integrative Biology & Biodiversity Institute of Ontario, University of Guelph, Guelph, Canada
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Hodgson AN, Booth AJ, David-Engelbrecht V, Henninger TO. Some life-history parameters of the non-native amphipodPlatorchestia platensis(Talitridae) in a warm temperate South African estuary. ACTA ACUST UNITED AC 2014. [DOI: 10.1080/0035919x.2014.941961] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Malherbe H, Samways M. Rocky shores of a major southern African Marine Protected Area are almost free from intertidal invertebrate alien species. KOEDOE: AFRICAN PROTECTED AREA CONSERVATION AND SCIENCE 2014. [DOI: 10.4102/koedoe.v56i1.1206] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Abstract
A major threat to marine ecosystems is the establishment and proliferation of invasive alien species. This study addresses gaps in our knowledge regarding marine alien invertebrate species in the Kogelberg Biosphere Reserve (KBR) and adjacent Betty’s Bay Marine Protected Area (MPA) in the Western Cape of South Africa, together a potentially important area for south-coast marine conservation. Understanding the distribution and geographical expansion of these species is critical for conservation planning. A quantitative systematic survey of the intertidal rocky shore region was undertaken. The mytilid Mediterranean mussel, Mytilus galloprovincialis, and the bryozoan Watersipora subtorquata were the only alien species recorded along the coastline, which included the MPA. The abundance of M. galloprovincialis was significantly higher outside the MPA, and the abundance of W. subtorquata was significantly higher inside the MPA. With only two alien species recorded, the Betty’s Bay MPA and its surroundings support relatively few marine alien species with regards to rocky shore invertebrate biodiversity. Conservation implications: It is important that the Betty’s Bay MPA and its adjacent coastline maintain its current status as an area with relatively few marine alien species. The conservation implications on management require routine surveys of this region to detect early introductions of any additional species.
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Mead A, Carlton J, Griffiths C, Rius M. Introduced and cryptogenic marine and estuarine species of South Africa. J NAT HIST 2011. [DOI: 10.1080/00222933.2011.595836] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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