The invasive New Zealand mudsnail, Potamopyrgus antipodarum, is an effective grazer of algae and altered the assemblage of diatoms more than native grazers

Krist, Amy C.; Charles, Caroline C.

doi:10.1007/s10750-012-1138-5

Cited by 23 publications

(16 citation statements)

References 32 publications

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“…In our simulations, the presence of nonnative snails rerouted basal energy away from native aquatic invertebrates, which in turn lowered fish biomass by reducing the availability of their preferred (and higher quality) aquatic invertebrate prey. This finding is supported by empirical studies, which show that New Zealand mudsnails can numerically dominate aquatic invertebrate assemblages, and consume a significant portion of basal primary production (Hall et al 2003, Krist andCharles 2012). Similar results have also been observed for other nonnative aquatic invertebrates (Johnson et al 2009).…”

Section: Effects Of Food Web Structuresupporting

confidence: 55%

Incorporating food web dynamics into ecological restoration: a modeling approach for river ecosystems

Bellmore

Benjamin

Newsom

et al. 2017

Ecological Applications

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Restoration is frequently aimed at the recovery of target species, but also influences the larger food web in which these species participate. Effects of restoration on this broader network of organisms can influence target species both directly and indirectly via changes in energy flow through food webs. To help incorporate these complexities into river restoration planning, we constructed a model that links river food web dynamics to in-stream physical habitat and riparian vegetation conditions. We present an application of the model to the Methow River, Washington, USA, a location of on-going restoration aimed at recovering salmon. Three restoration strategies were simulated: riparian vegetation restoration, nutrient augmentation via salmon carcass addition, and side channel reconnection. We also added populations of nonnative aquatic snails and fish to the modeled food web to explore how changes in food web structure mediate responses to restoration. Simulations suggest that side channel reconnection may be a better strategy than carcass addition and vegetation planting for improving conditions for salmon in this river segment. However, modeled responses were strongly sensitive to changes in the structure of the food web. The addition of nonnative snails and fish modified pathways of energy through the food web, which negated restoration improvements. This finding illustrates that forecasting responses to restoration may require accounting for the structure of food webs, and that changes in this structure, as might be expected with the spread of invasive species, could compromise restoration outcomes. Unlike habitat-based approaches to restoration assessment that focus on the direct effects of physical habitat conditions on single species of interest, our approach dynamically links the success of target organisms to the success of competitors, predators, and prey. By elucidating the direct and indirect pathways by which restoration affects target species, dynamic food web models can improve restoration planning by fostering a deeper understanding of system connectedness and dynamics.

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Section: Effects Of Food Web Structuresupporting

confidence: 55%

Incorporating food web dynamics into ecological restoration: a modeling approach for river ecosystems

Bellmore

Benjamin

Newsom

et al. 2017

Ecological Applications

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“…and Brachycentrus sp. (Krist & Charles, ). Ephemerella , though, was also an effective grazer and likely competes with Potamopyrgus for periphyton in this catchment (Krist & Charles, ).…”

Section: Discussionmentioning

confidence: 99%

The roles of resource availability and competition in mediating growth rates of invasive and native freshwater snails

Riley

Dybdahl

2015

Freshwater Biology

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Summary The classic paradigm in community ecology is that competition structures communities, limiting the number of species that can coexist. Under this paradigm, highly diverse communities should be biotically resistant to invasion. However, the importance of biotic resistance in repelling invasions might depend on resources because high resource availability can increase growth rates of invasive species and either reduce or increase competitive effects of invasive species on native community members. We tested how experimentally altered resource levels affected growth rates of an invasive (Potamopyrgus antipodarum) and a native snail (Pyrgulopsis robusta) and interspecific competition between them. Potamopyrgus and Pyrgulopis are the dominant macroinvertebrates in streams within the range of the locally endemic Pyrgulopsis in Wyoming, U.S.A. In the absence of competition, we found that Potamopyrgus always grew faster than Pyrgulopsis at both high and low resource levels. In the presence of interspecific competition, Potamopyrgus growth rates were not affected by resource levels or the biomass of Pyrgulopsis competitors. On the other hand, Pyrgulopsis grew slower at low resource levels and especially when the biomass of Potamopyrgus competitors was high. These results indicate that negative effects of Potamopyrgus on Pyrgulopsis growth rates were stronger at low resource levels. In contrast, Pyrgulopsis did not reduce Potamopyrgus growth under any resource scenario. Thus, increased resource availability seems to mitigate strong competitive effects of Potamopyrgus on the native snail in this stream.

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“…and a native mayfly nymph (Ephemerella sp. ), which may, in part, explain why this invasive snail has done so well in waters in the western United States (Krist and Charles, 2012). The retreat weaving midge, Pseudochironomus richardsoni Malloch influenced the composition and abundance of epiphytic algal assemblages, and seasonal shifts in the epiphytes influenced food quality and quantity available for grazing .…”

Section: Trophic Interactions Trophic Interactionsmentioning

confidence: 99%

Substratum‐Associated Microbiota

Furey¹,

Liess²

2013

Water Environment Research

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The invasive New Zealand mudsnail, Potamopyrgus antipodarum, is an effective grazer of algae and altered the assemblage of diatoms more than native grazers

Cited by 23 publications

References 32 publications

Incorporating food web dynamics into ecological restoration: a modeling approach for river ecosystems

Incorporating food web dynamics into ecological restoration: a modeling approach for river ecosystems

The roles of resource availability and competition in mediating growth rates of invasive and native freshwater snails

Substratum‐Associated Microbiota

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