Native and alien crayfish species: do their trophic roles differ?

Weinländer, Martin; Füreder, Leopold

doi:10.1086/689031

Cited by 13 publications

(14 citation statements)

References 55 publications

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“…In terms of predator defense, fixed retreats afford some protection (Fuller and Rand 1990), but they also impose a sedentary lifestyle that may make hydrosphychids vulnerable to crayfish. Weinlander and Fureder (2016), for example, showed that native and non-native crayfish in Austrian streams preyed more successfully on slow-moving and sessile invertebrates than those that were agile and fast-moving. Unlike filter-feeding Simullidae, which can reposition themselves on substrates with relative ease (Lacoursi ere 1992), hydropsychids cannot move away from or escape threats without vacating their retreats, which means sacrificing the energy and resources it took to construct the retreat, to say nothing of the lost feeding time incurred before another retreat can be built.…”

Section: Discussionmentioning

confidence: 99%

“…There is a considerable body of literature documenting the impacts crayfish, especially non-native crayfish, have on stream communities (see reviews by Phillips et al 2009, Twardochleb et al 2013. These impacts often have far-reaching consequences for stream structure and function and this had led many authors to classify crayfish as ecosystem engineers (Statzner et al 2003, Hansen et al 2013, Jackson et al 2014, or alternatively, keystone consumers (Creed 1994, Lodge et al 1994, Weinlander and Fureder 2016. As ecosystem engineers, crayfish foraging and burrowing can rearrange streambed substrates, affect bed topography, and influence gravel transport and sediment accumulation (Parkyn et al 1997, Statzner et al 2000, Statzner et al 2003, Statzner and Sagnes 2008, Johnson et al 2011, Albertson and Daniels 2016.…”

Section: Introductionmentioning

confidence: 99%

“…The extent to which these impacts occur can vary among species and across habitats (Flinders and Magoulick 2003, Phillips et al 2009, Larson and Olden 2010, Lodge et al 2012, Jackson et al 2014, Weinlander and Fureder 2016, and this is certainly true when comparing native and non-native species (Twardochleb et al 2013, James et al 2015. In their meta-analyses examining the ecological impacts of non-native crayfish on aquatic ecosystems worldwide, Twardochleb et al (2013) found that non-natives generally had greater and more negative effects than did native species on stream communities.…”

Section: Introductionmentioning

confidence: 99%

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Does stream current modify crayfish impacts on a benthic community?

Wellnitz

Frase

Gapinski

et al. 2019

Journal of Freshwater Ecology

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Non-native crayfish can have impacts on stream communities that are highly variable. A possible explanation for this variability is that crayfish are responding in a context-dependent manner to variation in environmental factors. Among the most critical environmental factors in streams is current velocity. Moving water defines lotic ecosystems and many benthic organisms, including crayfish, respond to its influence. To examine how current velocity affected the impacts of non-native Orconectes rusticus crayfish on benthic communities, we conducted a cage-enclosure experiment in a Wisconsin stream. We hypothesized that current velocities > 50 cm s À1 would decrease the effects that O. rusticus had on community composition (macroinvertebrate richness and numbers) and physical structure (sediment accumulation). Three cage enclosure treatments (open, closed crayfish and closed control) were grouped into eight replicate blocks divided equally among streambed regions of slow (< 50 cm s À1 ) and fast (> 50 cm s À1 ) current. Open cages allowed resident crayfish access, closed crayfish cages contained one O. rusticus, and closed controls had no crayfish. After three weeks, crayfish cages had lower macroinvertebrate abundance and richness and less sediment accumulation. Current velocity showed a positive relationship to macroinvertebrates in general, and a negative relationship to sediment build-up. The most common macroinvertebrates were hydropsychid caddisflies that responded to O. rusticus in a context-dependent manner such that cages containing crayfish had decreased hydropsychid numbers in fast current, but not in slow. Open cage treatments showed a similar pattern, suggesting that natural crayfish densities in the stream were also sufficient for lowering hydropsychid numbers in fast current. Our study demonstrates that current velocity may provide an important context for understanding the effects that O. rusticus have on benthic communities, not just in terms of what these crayfish do, but how the benthic communities respond to their presence. ARTICLE HISTORY

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Does stream current modify crayfish impacts on a benthic community?

Wellnitz

Frase

Gapinski

et al. 2019

Journal of Freshwater Ecology

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“…Freshwater crayfish affect nearly every trophic level of their habitat and influence their structural environment due to their burrowing activity. Therefore, these largest invertebrates of freshwater bodies are called "keystone species" and "ecosystem engineers" (Weinländer and Füreder 2016). Due to decreasing populations, the habitat directive protects all native freshwater crayfish species in Europe (European Communities 1992).…”

Section: Introductionmentioning

confidence: 99%

Noble Crayfish Are More Sensitive to Terbuthylazine than Parthenogenetic Marbled Crayfish

Laurenz

Lietz

Brendelberger

et al. 2020

Water Air Soil Pollut

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We investigated the sensitivity of two freshwater crayfish species (Astacus astacus and Procambarus virginalis) during embryonic development to chronic exposure to the herbicide terbuthylazine under laboratory conditions. The assessed parameters included time of embryonic development, survival rate, hatching weight and histopathology of hepatopancreas. LC50 (median lethal concentration) and ED50 (median effective concentration) were estimated. We were able to determine effects of terbuthylazine for every investigated parameter. For noble crayfish, the LC50 value after 45 days was 0.11 mg/L, and the histology of the hepatopancreas showed effects starting from 0.025 mg/L. Other parameters revealed effects starting at concentrations of 1.6 mg/L for weight and 6.4 mg /L for embryonic development time and hatching rate. Marbled crayfish only showed effects concerning the hatching rate and survival rate at concentrations without a clear dose-effects curve. As a conclusion, our data shows the risk of terbuthylazine in existing concentrations in freshwater ecosystems to non-target organisms and also the need of toxicological studies on directly affected species in addition to the use of model organisms.

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“…The trade in crayfish for aquarium pets has a disproportionate potential for significant scientific and ecological effects (Faulkes, 2015a). Crayfish are keystone species that act as ecosystem engineers (Creed, 1994;Momot, 1995;Nyström et al, 1996;Usio et al, 2009;Weinländer and Füreder, 2016), so the biological and economic effects of introductions of nonindigenous crayfish species to new locations are often substantial. The economic impacts of crayfish introductions have generally been negative (Twardochleb et al, 2013).…”

mentioning

confidence: 99%

Prohibiting pet crayfish does not consistently reduce their availability online

Faulkes

2018

Nauplius

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The pet trade is a significant source of introductions of non-indigenous aquatic species, such as crayfish. To test whether legislation that regulates the ownership of ornamental animals for aquariums had the desired effect of reducing the availability of those pets, classified advertising websites were monitored for sales of crayfish in jurisdictions with and without legislation regulating the ownership of crayfish. Advertisements from Canadian provinces with legislation against owning crayfish were compared to provinces without such legislation. The population adjusted number of advertisements for crayfish, and number of distinct sellers of crayfish, was significantly lower in one of two provinces that prohibited crayfish compared to provinces that permitted crayfish. This mixed outcome suggests that legislation alone does not consistently reduce online trade in crayfish.

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Native and alien crayfish species: do their trophic roles differ?

Cited by 13 publications

References 55 publications

Does stream current modify crayfish impacts on a benthic community?

Does stream current modify crayfish impacts on a benthic community?

Noble Crayfish Are More Sensitive to Terbuthylazine than Parthenogenetic Marbled Crayfish

Prohibiting pet crayfish does not consistently reduce their availability online

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