Rapid range expansion of an invasive predatory snail, Oxychilus alliarius (Miller 1822), and its impact on endemic Hawaiian land snails

Curry, Patrick A.; Yeung, Norine W.; Hayes, Kenneth A.; Meyer, Wallace M.; Taylor, Andrew D.; Cowie, Robert H.

doi:10.1007/s10530-016-1119-0

Cited by 11 publications

(8 citation statements)

References 34 publications

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“…Theba pisana, and Helisoma duryi were implicated in causing MR impacts to beach‐dwelling snails and snails inhabiting artificial drains respectively (Christie et al., ; Rumi et al., ). Moreover, various gastropods have been consistently related to declines in endemic island snail fauna populations, namely in Hawai'i, New Zealand and the Canary Islands (Curry & Yeung, ; Curry et al., ; Kappes et al., ; Mahlfeld, ; Meyer & Cowie, ). This is potentially due to the uniqueness and vulnerability of island habitats (Mueller‐Dombois & Loope, ).…”

Section: Discussionmentioning

confidence: 99%

“…Zealand and the Canary Islands (Curry & Yeung, 2013;Curry et al, 2016;Kappes et al, 2009;Mahlfeld, 2000;Meyer & Cowie, 2010). This is potentially due to the uniqueness and vulnerability of island habitats (Mueller-Dombois & Loope, 1990).…”

Section: Discussionmentioning

confidence: 99%

“…Given the complex nature of alien impact (Simberloff et al., ) there is reason to believe that native range latitude indeed has no relation to impact, at least for gastropods. A good example of this is the genus Oxychilus , whose species have narrow native range latitudes, but have caused significant declines to the Hawai'ian snail fauna (Curry & Yeung, ; Curry et al., ; Meyer & Cowie, ). The difficulty in identifying true native distributions due to human influence (Carlton, ) may be confounded with the native range latitude correlations.…”

Section: Discussionmentioning

confidence: 99%

“…Gastropods are a taxonomic class that represents significant problem as aliens, causing a multitude of environmental and socioeconomic impacts in many habitats. In Hawai'i, they have been implicated as a major threat to native plants (Joe & Daehler, 2008) and snails (Curry et al, 2016;Meyer & Cowie, 2010), and have been suggested to harm native species in aquatic habitats (Darwall, Smith, Tweddle, & Skelton, 2009;Miranda & Perissinotto, 2012). Further, many gastropods have been the cause of significant problems in agriculture (Barker, 2002;Coupland & Baker, 1995;Nash & Hoffmann, 2012), resulting in economic losses by reducing yield and leading to rejection of exports (Charwat, Davies, & Fraser, 1995;Cowie, Hayes, Tran, & Meyer, 2008;Moran, Gotlib, & Yaakov, 2004).…”

Section: Introductionmentioning

confidence: 99%

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Gastropods alien to South Africa cause severe environmental harm in their global alien ranges across habitats

Kesner

Kumschick

2018

Ecology and Evolution

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Alien gastropods have caused extensive harm to biodiversity and socioeconomic systems like agriculture and horticulture worldwide. For conservation and management purposes, information on impacts needs to be easily interpretable and comparable, and the factors that determine impacts understood. This study aimed to assess gastropods alien to South Africa to compare impact severity between species and understand how they vary between habitats and mechanisms. Furthermore, we explore the relationship between environmental and socioeconomic impacts, and both impact measures with life‐history traits. We used the Environmental Impact Classification for Alien Taxa (EICAT) and Socio‐Economic Impact Classification for Alien Taxa (SEICAT) to assess impacts of 34 gastropods alien to South Africa including evidence of impact from their entire alien range. We tested for correlations between environmental and socioeconomic impacts per species, and with fecundity and native latitude range using Kendall's tau tests. Kruskal–Wallis tests were used to compare impact magnitude among mechanisms and habitats, respectively. This study presents the first application of EICAT and SEICAT for invertebrates. There was no correlation between environmental impacts and socioeconomic impacts. Habitats did not differ regarding the severity of impacts recorded, but impacts via disease transmission were lower than other mechanisms. Neither fecundity nor native range latitude was correlated with impact magnitude. Despite gastropods being agricultural and horticultural pests globally, resilience of socioeconomic systems makes high impacts uncommon. Environmental systems may be vulnerable to gastropod impacts across habitats, having experienced multiple local extinctions of wetland island snail fauna. South Africa stands out as the only continental country that follows this trend. The knowledge gained on severity and nature of gastropod impacts is useful in risk assessment, which can aid conservation management. To make impact assessments more realistic, we suggest alternative ways of reporting impacts classified under EICAT and SEICAT.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Gastropods alien to South Africa cause severe environmental harm in their global alien ranges across habitats

Kesner

Kumschick

2018

Ecology and Evolution

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“…There are also numerous other non-native invertebrate species that prey on or parasitise land snails and that have been introduced outside their native ranges, most commonly accidentally through human activities. These include predatory snails such as Gulella bicolor, Streptostele musaecola and Oxychilus alliarius (Cowie 1997;Meyer and Cowie 2010;Curry et al 2016Curry et al , 2020, various flatworms, carabid beetles, ants, phorid and sarcophagid flies, nemertean ribbonworms, and not inconsiderable numbers of helminth parasites (Barker 2004). For the most part, the impact of these non-native species on land snail communities has yet to be examined in any depth and is beyond the scope of this review.…”

Section: Introductionmentioning

confidence: 99%

Negative impacts of invasive predators used as biological control agents against the pest snail Lissachatina fulica: the snail Euglandina ‘rosea’ and the flatworm Platydemus manokwari

Gerlach¹,

Barker

Bick

et al. 2020

Biol Invasions

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Since 1955 snails of the Euglandina rosea species complex and Platydemus manokwari flatworms were widely introduced in attempted biological control of giant African snails (Lissachatina fulica) but have been implicated in the mass extinction of Pacific island snails. We review the histories of the 60 introductions and their impacts on L. fulica and native snails. Since 1993 there have been unofficial releases of Euglandina within island groups. Only three official P. manokwari releases took place, but new populations are being recorded at an increasing rate, probably because of accidental introduction. Claims that these predators controlled L. fulica cannot be substantiated; in some cases pest snail declines coincided with predator arrival but concomitant declines occurred elsewhere in the absence of the predator and the declines in some cases were only temporary. In the Hawaiian Islands, although there had been some earlier declines of native snails, the Euglandina impacts on native snails are clear with rapid decline of many endemic Hawaiian Achatinellinae following predator arrival. In the Society Islands, Partulidae tree snail populations remained stable until Euglandina introduction, when declines were extremely rapid with an exact correspondence between predator arrival and tree snail decline. Platydemus manokwari invasion coincides with native snail declines on some islands, notably the Ogasawara Islands of Japan, and its invasion of Florida has led to mass mortality of Liguus spp. tree snails. We conclude that Euglandina and P. manokwari are not effective biocontrol agents, but do have major negative effects on native snail faunas. These predatory snails and flatworms are generalist predators and as such are not suitable for biological control.

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Non-native gastropods in high elevation horticultural facilities in Hawaii: a threat to native biodiversity

et al. 2019

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Rapid range expansion of an invasive predatory snail, Oxychilus alliarius (Miller 1822), and its impact on endemic Hawaiian land snails

Cited by 11 publications

References 34 publications

Gastropods alien to South Africa cause severe environmental harm in their global alien ranges across habitats

Gastropods alien to South Africa cause severe environmental harm in their global alien ranges across habitats

Negative impacts of invasive predators used as biological control agents against the pest snail Lissachatina fulica: the snail Euglandina ‘rosea’ and the flatworm Platydemus manokwari

Non-native gastropods in high elevation horticultural facilities in Hawaii: a threat to native biodiversity

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