Flagships and fragments — perspectives on the conservation of freshwater fishes in southern Africa

Skelton, PH

doi:10.2989/160859100780177929

Cited by 19 publications

(31 citation statements)

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“…As about 1% of all non-native species introduced are likely to present an actual risk of ecological impact (Williamson, 1996;Simberloff, 2007;Gozlan, 2008), the overlay of (predicted) areas at greatest introduction risk and those of high conservation value will help set priorities for conservation and management efforts, making them more effective. This will be of particular use for early detection and eradication, which has often proved to be crucial in the fight against biological invasions (Skelton, 2000;Lodge and Shrader-Frechette, 2003).…”

Section: Demographic Factors and Fish Introductionsmentioning

confidence: 99%

The demography of introduction pathways, propagule pressure and occurrences of non‐native freshwater fish in England

Copp

Vilizzi

Gozlan

2010

Aquatic Conservation

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ABSTRACT1. Biological invasion theory predicts that the introduction and establishment of non-native species is positively correlated with propagule pressure. Releases of pet and aquarium fishes to inland waters has a long history; however, few studies have examined the demographic basis of their importation and incidence in the wild.2. For the 1500 grid squares (10 Â 10 km) that make up England, data on human demographics (population density, numbers of pet shops, garden centres and fish farms), the numbers of non-native freshwater fishes (from consented licences) imported in those grid squares (i.e. propagule pressure), and the reported incidences (in a national database) of non-native fishes in the wild were used to examine spatial relationships between the occurrence of non-native fishes and the demographic factors associated with propagule pressure, as well as to test whether the demographic factors are statistically reliable predictors of the incidence of non-native fishes, and as such surrogate estimators of propagule pressure.3. Principal coordinates of neighbour matrices analyses, used to generate spatially explicit models, and confirmatory factor analysis revealed that spatial distributions of non-native species in England were significantly related to human population density, garden centre density and fish farm density. Human population density and the number of fish imports were identified as the best predictors of propagule pressure.4. Human population density is an effective surrogate estimator of non-native fish propagule pressure and can be used to predict likely areas of non-native fish introductions. In conjunction with fish movements, where available, human population densities can be used to support biological invasion monitoring programmes across Europe (and perhaps globally) and to inform management decisions as regards the prioritization of areas for the control of non-native fish introductions.

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Section: Demographic Factors and Fish Introductionsmentioning

confidence: 99%

The demography of introduction pathways, propagule pressure and occurrences of non‐native freshwater fish in England

Copp

Vilizzi

Gozlan

2010

Aquatic Conservation

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“…According to Skelton (2000), sport-fishing development in South Africa was influenced by Western culture, beliefs, and philosophies. Colonists transplanted their cultural values and tastes into South Africa, as well as species that sustained those values and tastes (Owens 2002).…”

Section: Downloaded By [Universite Laval] At 03:14 04 October 2015mentioning

confidence: 99%

“…As Skelton (2000) rightly points out, by the 1920s, there was awareness of the biodiversity impact of introduced and translocated species. While the 1920s surveys demonstrated the fisheries potential for introduced species, they also revealed important information about the threat imposed on indigenous species by alien fish (Hey 1926;Skelton 2000). As K.H.…”

Section: Fisheries Knowledge and Trout Introductionmentioning

confidence: 95%

The Political Economy of South African Trout Fisheries

Marire

2015

Journal of Economic Issues

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“…Losses in aquatic biodiversity caused by species invasions have often been reported (e.g., Pimm 1991;Gido and Brown 1999;Skelton 2000;Arthur and Subasinghe 2002;Cambray 2003;Maezono and Miyashita 2004). Introduced species may be responsibile for major changes in community structure and ecosystem function (Vitousek 1990;Lodge 1993;Mills et al 1993;Cambray and Pister 2002;Stoffels and Humphries 2003) due to biotic interactions such as competition and predation (Lodge 1993;Gido and Brown 1999), potential genetic impacts (Gharrett 1994;Viola and Schuck 1995;Arthur and Subasinghe 2002), abiotic disturbances (Gido and Brown 1999), and the spread of diseases (Bachman 1984;Viola and Schuck 1995) especially in the case of exotic and/or alien species that also have been identified as a main cause for the decline of endemic species (e.g., Stoffels and Humphries 2003;Maezono and Miyashita 2004) in freshwater fishes worldwide when they have expanded.…”

Section: Introductionmentioning

confidence: 99%

Seasonal dynamics of fish assemblage in a pond canal

2007

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The annual dynamics of fish assemblage in a pond-connecting canal of a South Moravian pond aquaculture facility was studied to reveal potential assemblage effects on pond stocks and vice versa. The species richness of fish assemblage and seasonal dynamics of its development were predominantly dependent upon the fish stock of the interconnected ponds (particularly due to escapees during the period of pond harvesting), which contributed to a considerable increase of commercial fish species occurrence. Using a seasonal parameter, the season proved to have a major impact on fish assemblage dynamics (r = À0.71, P < 0.001). Spring samples were dominated by commercial fishes of aquaculture origin (mainly Cyprinus carpio). Occurrence of several fish species originating from the wild (bleak, Alburnus alburnus, chub, Leuciscus cephalus and roach, Rutilus rutilus) was also reported.The pond canal was found to be an important reservoir site of persistent survival and potential subsequent spreading of some undesirable alien fishes such as topmouth gudgeon (Pseudorasbora parva) and gibel carp (Carrasius auratus). Moreover, more attention should be paid to the potential negative impacts of all fishes of aquaculture origin upon the natural ecosystem and to the adverse effects due to the immigration of wild fish into aquaculture pond farming units.

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Flagships and fragments — perspectives on the conservation of freshwater fishes in southern Africa

Cited by 19 publications

References 0 publications

The demography of introduction pathways, propagule pressure and occurrences of non‐native freshwater fish in England

The demography of introduction pathways, propagule pressure and occurrences of non‐native freshwater fish in England

The Political Economy of South African Trout Fisheries

Seasonal dynamics of fish assemblage in a pond canal

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