Food web consequences of long-term invasive crayfish control

Hansen, Gretchen J. A.; Hein, Catherine L.; Roth, Brian M.; Zanden, M. Jake Vander; Gaeta, Jereme W.; Latzka, Alexander W.; Carpenter, Stephen R.

doi:10.1139/cjfas-2012-0460

Cited by 77 publications

(68 citation statements)

References 73 publications

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“…Recent field studies and meta-analyses have shown that crayfish effects can be habitat-specific (Kreps et al 2012, Hansen et al 2013, Ruokonen et al 2014 or species-specific (Haddaway et al 2012, Jackson et al 2014. Furthermore, crayfish impacts might change in the long-term (Strayer et al 2006, Kelly et al 2013, and hence it has been stressed that effects should be investigated at large temporal scales to observe changes that develop in native biota over time.…”

Section: Crayfish and Their Ecological Effectsmentioning

confidence: 99%

The introduced signal crayfish and native noble crayfish have different effects on sublittoral macroinvertebrate assemblages in boreal lakes

et al. 2015

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Summary We investigated differences in the abundance, community composition and taxon richness of sublittoral macroinvertebrates in boreal lakes containing introduced invasive signal crayfish (Pacifastacus leniusculus) or native noble crayfish (Astacus astacus). We hypothesised that sublittoral macroinvertebrate assemblages in lakes containing noble crayfish, which reportedly prefer the shallow littoral, would differ little from those in lakes without crayfish, in contrast to assemblages in lakes containing signal crayfish, which reportedly forage at greater depths. In a set of 24 small and medium‐sized Finnish lakes, eight lakes contained signal crayfish, eight had noble crayfish and eight control lakes had no crayfish. At three sites per lake, we sampled macroinvertebrates quantitatively from soft sediment in the sublittoral. The sublittoral macroinvertebrate assemblage in lakes with noble crayfish and control lakes was similar. In contrast, lakes with signal crayfish had a lower density of Trichoptera and Ephemeroptera, as well as a lower density and species richness of Chironomidae, and a lower overall benthic density and taxon richness. In contrast to some previous reports from other habitats, we infer that introduced signal crayfish have stronger negative effects than native noble crayfish on sublittoral macroinvertebrates. Hence, the ecological equivalence or differences of crayfish species cannot be generalised across habitats.

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Section: Crayfish and Their Ecological Effectsmentioning

confidence: 99%

The introduced signal crayfish and native noble crayfish have different effects on sublittoral macroinvertebrate assemblages in boreal lakes

et al. 2015

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“…The crayfish density remained very low and previous studies have reported that crayfish effects on macroinvertebrates are density-dependent (Hansen et al, 2013;Ruokonen et al, 2014;Wilson et al, 2004). Our five year follow-up period is rather short, even though an exploitable signal crayfish population (catch/trap/night >1) in Finnish lakes can develop within five years (Erkamo et al, 2010).…”

Section: Discussionmentioning

confidence: 79%

“…Previous studies have shown that benthic macroinvertebrate communities can recover rather quickly after a decline in crayfish population in both lakes (McCarthy et al, 2006) and streams ( Moorhouse et al, 2014). Hansen et al, (2013) reported a large increase in gastropod densities following a dramatic decline in crayfish abundance. Hence, the abrupt decrease in crayfish abundance in 2010 and the following year, which we presume to be a combination of high trapping pressure and natural variation in recruitment, might explain the increased density and species richness of snails and total taxon richness in 2011 at the crayfish site.…”

Section: Discussionmentioning

confidence: 97%

“…Studies at various temporal and spatial scales in experimental set-ups, streams and lakes have shown that non-native crayfish can have direct and indirect detrimental effects on benthic macroinvertebrate abundance and species richness, and on snails (Gastropoda) in particular (Nyström, 1999;Twardochleb et al, 2013;Ruokonen et al, 2014;Ercoli et al, 2015). However, few studies (Wilson et al, 2004;McCarthy et al, 2006;Kreps et al, 2012;Hansen et al, 2013;Mathers et al, 2016) have examined the effects of invasive crayfish using data collected over multiple years. We therefore examined the effects of invasive signal crayfish (Pacifastacus leniusculus Dana) on the stony littoral benthic macroinvertebrate communities of a large boreal lake, and assessed the extent to which the patterns previously observed in short-term space-for-time studies in the same lake (Bjurström et al, 2010;Ruokonen et al, 2014) were stable over time.…”

Section: Introductionmentioning

confidence: 99%

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Are the effects of an invasive crayfish on lake littoral macroinvertebrate communities consistent over time?

Ruokonen

Ercoli

Hämäläinen

2016

Knowl. Manag. Aquat. Ecosyst.

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-Management of invasive species requires assessment of their effects on recipient ecosystems. However, impact assessment of invasive species commonly lacks a long-term perspective which can potentially lead to false conclusions. We examined the effects of the invasive signal crayfish (Pacifastacus leniusculus Dana) on the stony littoral macroinvertebrate communities of a large boreal lake and assessed the extent to which the patterns observed in previous short-term studies were stable over time. We used temporal macroinvertebrate data collected in five consecutive years from a site with a well-established crayfish population, a site with no crayfish and a site where crayfish had been recently introduced. Our results revealed that signal crayfish had temporally rather consistent negative effects on the benthic macroinvertebrate assemblages but that the effects might be limited to certain taxa, in particular Gastropoda and Coleoptera. We also observed increases in Gastropoda density and taxa richness following a decline in crayfish density, indicating that the recovery of invertebrate assemblages might be fast. Hence, negative effects on benthic macroinvertebrates can likely be minimized by effective control of the signal crayfish population.Key-words: crayfish / invasive species / lake / littoral community / macroinvertebrates Résumé -Les effets d'une écrevisse invasive sur les communautés de macroinvertébrés littoraux d'un lac sontelles stables au fil du temps ?. La gestion des espèces envahissantes exige une évaluation de leurs effets sur les éco-systèmes récepteurs. Toutefois, l'évaluation de l'impact des espèces envahissantes manque souvent d'une perspective à long terme qui peut potentiellement conduire à des conclusions erronées. Nous avons examiné les effets de l'écrevisse signal invasive (Pacifastacus leniusculus Dana) sur les communautés de macroinvertébrés d'un littoral pierreux d'un grand lac boréal et évalué dans quelle mesure les tendances observées dans les études précédentes à court terme ont été stables au fil du temps. Nous avons utilisé les données temporelles de macroinvertébrés recueillies pendant cinq années consécutives d'un site avec une population d'écrevisses bien établie, d'un site sans écrevisses et d'un site où les écrevisses avaient été introduites récemment. Nos résultats ont révélé que les écrevisses signal ont eu des effets négatifs temporellement plutôt stables sur les assemblages de macroinvertébrés benthiques, mais que les effets pourraient être limités à certains taxons, notamment gastéropodes et coléoptères. Nous avons également observé une augmentation de densité des gastéropodes et de richesse en taxons suite à une baisse de la densité des écrevisses, ce qui indique que la récupération des assemblages d'invertébrés pourrait être rapide. Par conséquent, les effets négatifs sur les macroinvertébrés benthiques peuvent probablement être minimisés par un contrôle efficace de la population d'écrevisses signal.

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“…First, crayfish themselves have strong ecological effects. Because crayfish are omnivorous, non-indigenous crayfish can significantly change ecosystems by consuming plants (Chambers et al, 1990;Chucholl, 2013a) and smaller prey animals (Nunes et al, 2010;Gomez-Mestre & Díaz-Paniagua, 2011;Klose, 2011;Chucholl, 2013a;Hansen et al, 2013;Nunes et al, 2014). Non-indigenous species may out compete native crayfish species (Capelli & Munjal, 1982;Gherardi & Daniels, 2004;Klocker & Strayer, 2004;Nakata & Goshima, 2006;Weis, 2010;Sandra & Karlo, 2012).…”

Section: Risk Assessmentmentioning

confidence: 99%

The global trade in crayfish as pets

Faulkes¹

2015

Crust Res

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Abstract. The sale of crayfish in the pet trade has increased in recent decades, and a substantial fraction of the world s entire range of crayfish species is available in the pet trade. The market for pet crayfish creates two major concerns: the potential for over exploitation of natural populations of crayfish to supply the pet trade, and the negative consequences resulting from the release of non-indigenous crayfish into natural habitats. The chain from the source of crayfish to the final owner can be lengthy, and each step in the supply chain needs to be studied by different methods. While there are often regulations intended to limit the trade of crayfish as pets, they differ widely from place to place and seem to have limited success in changing the behaviour of owners of pet crayfish.

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Food web consequences of long-term invasive crayfish control

Cited by 77 publications

References 73 publications

The introduced signal crayfish and native noble crayfish have different effects on sublittoral macroinvertebrate assemblages in boreal lakes

The introduced signal crayfish and native noble crayfish have different effects on sublittoral macroinvertebrate assemblages in boreal lakes

Are the effects of an invasive crayfish on lake littoral macroinvertebrate communities consistent over time?

The global trade in crayfish as pets

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