First Occurrence of the Round Goby, &lt;em&gt;Neogobius melanostomus&lt;/em&gt;, in the St. Lawrence River at Cornwall, Ontario

Hickey, M. Brian C.; Fowlie, Adrienne R.

doi:10.22621/cfn.v119i4.212

Cited by 10 publications

(2 citation statements)

References 5 publications

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“…Sites were selected according to water conductivity, bottom substrate type and the presence of the round goby. The round goby is a widespread non‐native species originating from the Ponto Caspian region that was introduced in the St. Lawrence River (Hickey & Fowlie, 2005). Round goby density varies in the USLR according to physiological limiting factors, such as water conductivity and is absent from the Ottawa River (Astorg et al., 2021).…”

Section: Methodsmentioning

confidence: 99%

Ecological impact of a generalist invader in the aquatic food web is mediated by environmental context

Charette,

Derry

2024

Freshwater Biology

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Freshwater ecosystems are threatened by the introduction of invasive species. Generalist invaders often compete with native species for shared resources, resulting in possible native species niche displacement. However, environmental heterogeneity may modulate the level of individual specialisation in invasive species, altering the outcome of interspecific competition between invasive and native species. The objectives of our study were to (1) evaluate the environmental context of dietary specialisation and trophic position of an invasive species according to the Environmental Matching Hypothesis (EMH), and (2) consider how the environmental context of invasive species dietary resource use may influence the dietary niche of native species competing for similar resources. Resource use, trophic position and dietary niche were determined using gut content and stable isotope analyses for the invasive round goby (Negobius melanostomus) and the native yellow perch (Perca flavescens), along environmental gradients in an invaded fluvial ecosystem. Our results were in support of EMH for the invader diet and resource specialisation, but not trophic position. Under environmental conditions of high water‐conductivity, round gobies were generalists feeding mostly on pelagic prey. Under more challenging environmental conditions of low water‐conductivity, the invader specialised on preferred high‐quality benthic prey. The ecological impact of the round goby was greatest at low water‐conductivity sites where the invader was a benthic specialist; there was a greater relative dietary niche overlap between the invader and the native species. Our study uniquely illustrates how invasive species’ resource specialisation can be modulated by spatial environmental heterogeneity within ecosystems, and how this can subsequently alter the ecological impact of the invader on native species in aquatic food webs.

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Section: Methodsmentioning

confidence: 99%

Ecological impact of a generalist invader in the aquatic food web is mediated by environmental context

Charette,

Derry

2024

Freshwater Biology

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“…This gastropod does not have a pelagic larval phase: egg masses are deposited on the substrate, and juveniles move from the substrate to the macro-algal substrate (Pinel-Alloul & Magnin, 1973). Part of the range of A. limosus has been invaded by the round goby (Neogobius melanostomus ), a molluscivorous fish, from the lower Great Lakes and running downstream throughout the Upper St. Lawrence River (Hickey & Fowlie, 2005). Amnicola limosus is commonly found in the stomach contents of round gobies, and following the goby invasion of Lake Saint-Louis, A. limosuspopulations experienced a 0.5-1 mm reduction in shell size .…”

Section: Introductionmentioning

confidence: 99%

Limited migration from physiological refugia constrains the rescue of native gastropods facing an invasive predator

Salamon,

Astorg,

Paccard

et al. 2023

Preprint

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Biological invasions have caused the loss of freshwater biodiversity worldwide. The interplay between adaptive responses and demographic characteristics is expected to be important for the resilience of populations to biological invasions, but the interaction between these factors is poorly understood. The native freshwater gastropod Amnicola limosus is distributed along spatial variation in impact from an invasive molluscivorous fish (Neogobius melanostomus), as well as in calcium concentration, which limits the distribution of this invader and thus provides refuges for the gastropods. We investigated if refuge populations could provide migrants to declining invaded gastropod populations through gene flow (i.e., demographic rescue), which could also help maintain genetic diversity (i.e., genetic rescue). We also tested for genetic adaptation of A. limosus to the invasive predator and the low calcium habitats. We conducted pooled whole-genome sequencing of twelve gastropod populations from the Upper St. Lawrence River, complemented with a laboratory reciprocal transplant of wild F0 A. limosus to measure survival and fecundity in treatments of water calcium concentration (low/high) and round goby cue (present/absent). We found that gene flow is restricted from the low-calcium uninvaded refugia towards high-calcium invaded populations, implying that the potential for demographic and genetic rescue is limited. We also detected signatures of divergent selection between habitat types and evidence of low fitness of individuals from refugia populations in both habitat types, which could be either a cause or consequence of the population structure between habitat types and highlights the potential conflict between demographic/genetic rescue and adaptation.

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Mercury Concentrations in Sentinel Fish Exposed to Contaminated Sediments Under a Natural Recovery Strategy Within the St. Lawrence River Area of Concern at Cornwall, Ontario, Canada

Lapointe

Ridal

2018

Arch Environ Contam Toxicol

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Legacy mercury (Hg) sediment deposits are a long-term issue within the St. Lawrence River (Cornwall) area of concern with three depositional areas along the Cornwall, ON waterfront containing sediments that exceed the Ontario Sediment Quality Guidelines for Hg. Assessing the bioavailability of these Hg-contaminated sediments plays a crucial role in evaluating the effectiveness of the Cornwall Sediment Strategy based on a natural recovery approach. We collected specimens of fallfish (Semotilus corporalis), round goby (Neogobius melanostomus), and yellow perch (Perca flavescens) to assess spatial and temporal trends of Hg concentrations in various areas along the Cornwall waterfront, including zones of contaminated sediments and non-contaminated reference sites. This study revealed that (1) Hg concentrations in fish collected from the contaminated zones remain greater than those of fish from non-impacted locations, indicating that natural recovery is not yet achieved, (2) total Hg concentrations in yellow perch collected in 2016 were greater than those obtained during a previous assessment, indicating a reversal of the previously observed long-term declines, and (3) total Hg concentrations in yellow perch collected at the outlet of Gray's Creek compared with yellow perch from contaminated zones, suggesting other important inputs of Hg to the ecosystem than the legacy contaminated sediments.

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First Occurrence of the Round Goby, <em>Neogobius melanostomus</em>, in the St. Lawrence River at Cornwall, Ontario

Cited by 10 publications

References 5 publications

Ecological impact of a generalist invader in the aquatic food web is mediated by environmental context

Ecological impact of a generalist invader in the aquatic food web is mediated by environmental context

Limited migration from physiological refugia constrains the rescue of native gastropods facing an invasive predator

Mercury Concentrations in Sentinel Fish Exposed to Contaminated Sediments Under a Natural Recovery Strategy Within the St. Lawrence River Area of Concern at Cornwall, Ontario, Canada

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