The North American signal crayfish, with particular reference to its success as an invasive species in Great Britain

Holdich, D. M.; James, J. Ben; Jackson, C. F.; Peay, S.

doi:10.1080/03949370.2014.903380

Cited by 52 publications

(91 citation statements)

References 77 publications

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“…These findings therefore support a growing body of research highlighting the detrimental impact of non-native signal crayfish on fluvial geochemistry, fluvial geomorphology and native aquatic biota (Crawford et al 2006;Johnson et al 2010;Harvey et al 2011). Their large size (typically 10-15 cm in length), aggressive nature, high population densities (up to 20 per square metre) and ability to rapidly colonise new environments have seen signal crayfish populations spread rapidly across Europe putting an increasing number of freshwater environments at risk (Holdich et al 2014;Kouba et al 2014). Further research is required in a wider range of fluvial environments at a variety of spatial and temporal scales to fully understand the importance, extent and underlying processes behind the nocturnal fine sediment mobilisation phenomena reported here.…”

Section: Significance and Further Researchsupporting

confidence: 74%

Diel turbidity cycles in a headwater stream: evidence of nocturnal bioturbation?

2016

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Purpose A small number of recent studies have linked daily cycles in stream turbidity to nocturnal bioturbation by aquatic fauna, principally crayfish, and demonstrated this process can significantly impact upon water quality under baseflow conditions. Adding to this limited body of research, we use highresolution water quality monitoring data to investigate evidence of diel turbidity cycles in a lowland, headwater stream with a known signal crayfish (Pacifastacus leniusculus) population and explore a range of potential causal mechanisms. Materials and methods Automatic bankside monitoring stations measured turbidity and other water quality parameters at 30-min resolution at three locations on the River Blackwater, Norfolk, UK, during 2013. Specifically, we focused on two 20-day periods of baseflow conditions during January and April 2013 which displayed turbidity trends typical of winter and spring seasons, respectively. The turbidity time-series, which were smoothed with 6.5-h Savitzky-Golay filters to highlight diel trends, were correlated against temperature, stage, dissolved oxygen and pH to assess the importance of abiotic influences on turbidity. Turbidity was also calibrated against suspended particulate matter (SPM) over a wide range of values via linear regression.Results and discussion Pronounced diel turbidity cycles were found at two of the three sites under baseflow conditions during April. Spring night-time turbidity values consistently peaked between 21:00 and 04:00 with values increasing bỹ 10 nephelometric turbidity units (NTU) compared with the lowest recorded daytime values which occurred between 10:00 and 14:00. This translated into statistically significant increases in median midnight SPM concentration of up to 76 % compared with midday, with night-time (18:00-05:30) SPM loads also up to 30 % higher than that recorded during the daytime (06:00-17:30). Relating turbidity to other water quality parameters exhibiting diel cycles revealed there to be neither any correlation that might indicate a causal link nor any obvious mechanistic connections to explain the temporal turbidity trends. Diel turbidity cycles were less prominent at all sites during the winter. Conclusions Considering the seasonality and timing of elevated turbidity, visual observations of crayfish activity and an absence of mechanistic connections with other water quality parameters, the results presented here are consistent with the hypothesis that nocturnal bioturbation is responsible for generating diel turbidity cycles under baseflow conditions in headwater streams. However, further research in a variety of fluvial environments is required to better assess the spatial extent, importance and causal mechanisms of this phenomenon.

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Section: Significance and Further Researchsupporting

confidence: 74%

Diel turbidity cycles in a headwater stream: evidence of nocturnal bioturbation?

2016

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“…Hudina et al, 2012;Holdich et al, 2014;Kouba et al, 2014). They are one of the largest freshwater invertebrates, frequently dominating benthic faunal biomass where they occur (Lodge and Hill, 1994;Momot, 1995;Sousa et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…Signal crayfish (P.leniusculus) are endemic to North America and have been introduced to over 20 countries in Europe. They are considered to be one of the most prevalent non-native crayfish species in Europe, with widespread and abundant populations now established across the UK (Kouba et al, 2014;Holdich et al, 2014). Unlike previous studies, the effect of invasive crayfish is investigated using multiple regions and catchments before and after invasion, and in direct comparison with control sites where long-term monitoring has not recorded the presence of P. leniusculus.…”

Section: Introductionmentioning

confidence: 99%

The long-term effects of invasive signal crayfish (Pacifastacus leniusculus) on instream macroinvertebrate communities

Mathers

Chadd

Dunbar

et al. 2016

Science of The Total Environment

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“…Therefore, these symbionts could influence the invasion success of non-native crayfish either beneficially or detrimentally. Relatively few reports exist of non-native branchiobdellidans in Europe despite the large number of crayfish introductions in recent decades (Souty-Grosset et al, 2006;Holdich et al, 2014;James et al, 2014;Kouba et al, 2014). This may be due to a lack of monitoring or because branchiobdellidans are poor invaders.…”

Section: Introductionmentioning

confidence: 99%

Assessing the invasion potential of non-native branchiobdellidans: experimental studies of survival, reproduction and competition

James

Davidson

Hunt

et al. 2017

Knowl. Manag. Aquat. Ecosyst.

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-The impact of invasive species on the recipient ecosystem can be strongly influenced by the presence of associated symbionts. It is therefore important to evaluate the likelihood of co-introduced symbiont establishment, and this requires an understanding of their life history traits. Here, we investigate survival, reproduction and competition in two non-native branchiobdellidan ectosymbionts (Xironogiton victoriensis and Cambarincola aff. okadai) on invasive signal crayfish (Pacifastacus leniusculus). In vivo, X. victoriensis established viable infrapopulations within 10 weeks, whereas C. aff. okadai went extinct within 2 weeks. Both X. victoriensis and C. aff. okadai deposited cocoons in vivo that hatched in 10-27 and 10-11 days, respectively. In vitro, X. victoriensis and C. aff. okadai survived for over 13 and 15 weeks respectively, although both were negatively affected by increased temperature and nitrate, and were absent from kick samples taken in the field. Only C. aff. okadai deposited cocoons in vitro, and this larger species readily predated on X. victoriensis but not vice versa. Both branchiobdellidans possess traits associated with colonisation success, including a relatively fast reproductive rate and extended off-host survival. Given its survival in vivo and known detrimental effect on signal crayfish X. victoriensis is perhaps more likely to influence host invasion dynamics, although its persistence may be affected by the presence of co-occurring symbionts.Keywords: invasive non-native species / invasive parasites / climate change / signal crayfish / Xironogiton victoriensis Résumé -Évaluation du potentiel invasif de Branchiobdellidés non indigènes : études expérimentales de survie, de reproduction et de compétition. L'impact des espèces envahissantes sur l'écosystème récepteur peut être fortement influencé par la présence de symbiotes associés. Il est donc important d'évaluer la probabilité d'un établissement de symbiotes co-introduits, ce qui nécessite une compréhension de leurs traits d'histoire de vie. Ici, nous étudions la survie, la reproduction et la compétition de deux ectosymbiontes branchiobdellidés non indigènes (Xironogiton victoriensis et Cambarincola aff. okadai) sur l'écrevisse signal invasive (Pacifastacus leniusculus). In vivo, X. victoriensis a établi des infrapopulations viables en 10 semaines, alors que C. aff. okadai s'est éteint dans les 2 semaines. X. victoriensis et C. aff. okadai ont déposé des cocons in vivo qui ont éclos en 10-27 et 10-11 jours respectivement. In vitro, X. victoriensis et C. aff. okadai ont survécu pendant plus de 13 et 15 semaines respectivement, bien que les deux aient été affectés négativement par l'augmentation de la température et du nitrate, et étaient absents des prélèvements prélevés sur le terrain. Seul C. aff. okadai a déposé des cocons in vitro, et cette espèce plus grande était prédateur sur X. victoriensis mais pas l'inverse. Les deux branchiobdellidés possèdent des traits associés à la réussite de la colonisation, y compris un tau...

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The North American signal crayfish, with particular reference to its success as an invasive species in Great Britain

Cited by 52 publications

References 77 publications

Diel turbidity cycles in a headwater stream: evidence of nocturnal bioturbation?

Diel turbidity cycles in a headwater stream: evidence of nocturnal bioturbation?

The long-term effects of invasive signal crayfish (Pacifastacus leniusculus) on instream macroinvertebrate communities

Assessing the invasion potential of non-native branchiobdellidans: experimental studies of survival, reproduction and competition

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