Trophic niche of an invasive generalist consumer: Australian redclaw crayfish,Cherax quadricarinatus, in the Inkomati River Basin, South Africa DOI Creative Commons
Tsungai A. Zengeya, R. Lombard,

Vhutali Ernest Nelwamondo

и другие.

Austral Ecology, Год журнала: 2022, Номер 47(7), С. 1480 - 1494

Опубликована: Авг. 18, 2022

Abstract Trophic niche analysis can be used to assess ecological opportunities available alien species in areas of introduction that might aid their establishment, define functional role and inform on potential impacts. This study assessed the trophic utilized by an invasive population Australian redclaw crayfish, Cherax quadricarinatus , Inkomati River Basin, South Africa. It evaluated hypothesis euryphagous feeding strategy crayfish may allow it shift its width position altering response fluctuations resource availability. Gut content stable isotope analyses were determine interactions. Redclaw shown omnivores diet consisted mainly algae, plant material invertebrates. Small‐sized individuals had a constricted fed primarily invertebrates, whereas larger expanded include proportions material. Crayfish caught from lotic environments higher proportion invertebrates than lentic environments, exploited wider summer winter. These differences are likely related productivity amongst habitats There was significant overlap (>60%) between Sidney's river crab ( Potamonautes sidneyi ), but not with other native Both have similar roles, possibly making functionally redundant this ecosystem. Even though both feed resources (plant invertebrates) normally limiting, invasion accelerator ecosystem processes such as shredding decomposition rates is, therefore, need for further studies examine potentially altered functions caused system.

Язык: Английский

Global economic costs of aquatic invasive alien species DOI Creative Commons
Ross N. Cuthbert, Zarah Pattison, Nigel G. Taylor

и другие.

The Science of The Total Environment, Год журнала: 2021, Номер 775, С. 145238 - 145238

Опубликована: Янв. 20, 2021

Much research effort has been invested in understanding ecological impacts of invasive alien species (IAS) across ecosystems and taxonomic groups, but empirical studies about economic effects lack synthesis. Using a comprehensive global database, we determine patterns trends costs aquatic IAS by examining: (i) the distribution these taxa, geographic regions cost types; (ii) temporal dynamics costs; (iii) knowledge gaps, especially compared to terrestrial IAS. Based on recorded from existing literature, conservatively summed US$345 billion, with majority attributed invertebrates (62%), followed vertebrates (28%), then plants (6%). The largest were reported North America (48%) Asia (13%), principally result resource damages (74%); only 6% management. magnitude number highest United States for semi-aquatic taxa. Many countries known had no costs, Africa Asia. Accordingly, network analysis revealed limited connectivity among countries, indicating disparate reporting. Aquatic have increased recent decades several orders magnitude, reaching at least US$23 billion 2020. Costs are likely considerably underrepresented IAS; 5% species, despite 26% invaders being aquatic. Additionally, 1% invasion marine species. thus substantial, underreported. over time expected continue rising future invasions. We urge improved reporting managers, practitioners researchers reduce gaps. Few proactive investments; management spending is urgently needed prevent limit current damages.

Язык: Английский

Процитировано

300
Biological Invasions in South Africa: An Overview DOI Creative Commons
Brian W. van Wilgen, John Measey, David M. Richardson

и другие.

Springer eBooks, Год журнала: 2020, Номер unknown, С. 3 - 31

Опубликована: Янв. 1, 2020

Язык: Английский

Процитировано

82
Diversity, distribution and extinction risk of native freshwater fishes of South Africa DOI
Albert Chakona, Martine S. Jordaan, D. Raimondo

и другие.

Journal of Fish Biology, Год журнала: 2022, Номер 100(4), С. 1044 - 1061

Опубликована: Фев. 16, 2022

Extinction risk for 101 valid species and 18 unique genetic lineages of native freshwater fishes South Africa was assessed in 2016 following the IUCN Red List criteria. An additional five (three new that were described two revalidated subsequent to assessments) present study. A synthesis outcome assessments 106 indicates 45 (36%) Africa's fish taxa are threatened (7 Critically Endangered, 25 13 Vulnerable). Of remaining taxa, 17 (14%) listed as Near Threatened, 57 (46%) Least Concern (4%) Data Deficient. More than 60% endemic threatened. The Cape Fold Ecoregion has highest proportion (67%) due existence a assemblage narrow-range species. Galaxias Pseudobarbus have number highly most these genera classified either CR or EN. Major threats country invasive species, deterioration water quality, impoundments excessive abstraction, land use changes modification riverine habitats. Immediate conservation efforts should focus on securing remnant populations preventing threat status, because recovery is rare. Accurate delimitation boundaries, mapping their distribution ranges, improved knowledge pressures long-term monitoring population trends need be prioritised generate credible data 2026 status designation important areas part National Freshwater Ecosystem Priority Areas (NFEPA) initiative.

Язык: Английский

Процитировано

36
The regulation of alien species in South Africa DOI Creative Commons
John R. Wilson, Sabrina Kumschick

South African Journal of Science, Год журнала: 2024, Номер 120(5/6)

Опубликована: Май 27, 2024

A key global change challenge is to significantly reduce the risks of alien taxa causing harmful impacts without compromising rights citizens. As part efforts address this challenge, South Africa promulgated comprehensive regulations and lists in 2014. In paper, we review how developed, changed over time, they have been implemented. March 2021, 560 were listed under four broad regulatory categories, between 2014 2020, almost 3000 permits issued regulate continued use taxa. The full regulated taxa, issued, corresponding are available Supplementary material. proposed standardised, transparent, science-informed process revise also presented – as 30 April 2024, risk analyses developed for 140 using Risk Analysis Alien Taxa (RAAT) framework reviewed by an independent scientific body [the Species Review Panel (ASRARP)] with input from taxon-specific experts. These recommendations being considered interdepartmental governmental decision-making established 2023 Committee (RARC)]. Finally, issues listing that remain be resolved presented. Africa’s continues develop, regulating will, believe, become more consistent, acceptable stakeholders, ultimately facilitate

Язык: Английский

Процитировано

8
South Africa’s Pathways of Introduction and Dispersal and How They Have Changed Over Time DOI Creative Commons
Katelyn T. Faulkner, Amy Burness, Marcus J. Byrne

и другие.

Springer eBooks, Год журнала: 2020, Номер unknown, С. 313 - 354

Опубликована: Янв. 1, 2020

Язык: Английский

Процитировано

39
The Role of Environmental Factors in Promoting and Limiting Biological Invasions in South Africa DOI Creative Commons
John R. Wilson, Llewellyn C. Foxcroft, Sjirk Geerts

и другие.

Springer eBooks, Год журнала: 2020, Номер unknown, С. 355 - 385

Опубликована: Янв. 1, 2020

Язык: Английский

Процитировано

34
Biotic Interactions as Mediators of Biological Invasions: Insights from South Africa DOI Creative Commons
Johannes J. Le Roux, Susana Clusella‐Trullas, Thabiso Michael Mokotjomela

и другие.

Springer eBooks, Год журнала: 2020, Номер unknown, С. 387 - 427

Опубликована: Янв. 1, 2020

Язык: Английский

Процитировано

34
Terrestrial Vertebrate Invasions in South Africa DOI Creative Commons
John Measey, Cang Hui,

Michael J. Somers

и другие.

Springer eBooks, Год журнала: 2020, Номер unknown, С. 115 - 151

Опубликована: Янв. 1, 2020

Язык: Английский

Процитировано

28
Experience and Lessons from Alien and Invasive Animal Control Projects in South Africa DOI Creative Commons
Sarah J. Davies, Martine S. Jordaan, Minette Karsten

и другие.

Springer eBooks, Год журнала: 2020, Номер unknown, С. 629 - 663

Опубликована: Янв. 1, 2020

Язык: Английский

Процитировано

25
Biological invasions in intermittent rivers and streams: current knowledge, and future frontiers DOI Creative Commons
Simone Guareschi, Josie South

Ecosistemas, Год журнала: 2024, Номер unknown, С. 2600 - 2600

Опубликована: Янв. 19, 2024

Intermittent rivers and ephemeral streams (IRES) have been overlooked in invasion science as the characteristic drying - wetting regimes are assumed to be a barrier processes. Flow contraction/cessation limits persistence success of water-dependent invasive alien species (IAS) most IRES, while flash floods may restrict limnophilic strictly terrestrial ones. However, IRES subject multiple anthropogenic stressors that could ultimately favour arrival spread IAS their mosaic dynamic habitats theoretically support both aquatic IAS. Successful characterised by adaptations, traits life histories which facilitate rapid, opportunistic exploitation resources. Here, potential invasibility is discussed along with summary current knowledge gaps, examples challenges across different continents. should considered cause for concern but also an intriguing study system understand mechanics biological invasions under global change.

Язык: Английский

Процитировано

3