Baseline survey of the fish fauna of a highly eutrophic estuary and evidence for its colonisation by Goldfish (Carassius auratus)

Tweedley, J.R.; Hallett, C.S.; Beatty, S.J.

doi:10.1007/s40071-017-0174-1

Cited by 8 publications

(3 citation statements)

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“…carassius (Knytl et al, 2018). If that is the case, these may represent actual detections of introduced feral goldfish in the tidal Thames, which is plausible due to this species tolerance of saltwater (Tweedley et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

Biodiversity assessment across a dynamic riverine system: A comparison of eDNA metabarcoding versus traditional fish surveying methods

et al. 2021

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While many studies have considered the ability of eDNA to assess animal communities in lacustrine settings, fewer have considered riverine systems, particularly those spanning the environmental gradients present in large river basins. Such dynamic systems are challenging for eDNA biomonitoring due to differing eDNA transport distances in rivers and the effects of river chemistry. To address this challenge, we focused on the Thames River system, UK, which has exceptional historical fish records providing a baseline to test the accuracy of eDNA metabarcoding in recovering fish community structure across both fresh and tidal zones. Two primer sets targeting 12S and CO1 regions were used to capture fish communities across the Thames catchment, from the upper freshwaters to the mid estuary. eDNA was collected at 35 sites, 14 of which were simultaneously paired with traditional fish surveys for direct comparison. We demonstrated that eDNA metabarcoding consistently detected more freshwater species than traditional methods, despite extensive sampling effort using the latter. In contrast, metabarcoding did not perform as well as traditional approaches in estuarine waters, although results included the novel detection of the protected sea lamprey. We further demonstrated that minor variations in the recovery of all approaches would not impact on the assessment of simple ecological models of community structure and, thus, some variability between approaches should not be viewed as a serious hindrance to uptake. Rather, our findings support a growing consensus that eDNA can reliably detect fish communities across dynamic freshwater habitats.

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Section: Discussionmentioning

confidence: 99%

Biodiversity assessment across a dynamic riverine system: A comparison of eDNA metabarcoding versus traditional fish surveying methods

et al. 2021

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“…As the oldest known ornamental fish (Roos, 2019), goldfish have been introduced across six continents. Goldfish can grow relatively large (>40 cm) and have a generalist omnivore diet; high fecundity; and high salinity, temperature and pollutant tolerances (Jia et al, 2019; Lorenzoni et al, 2007; Schofield et al, 2006; Spotila et al, 1979), which allow them to thrive in numerous lotic and lentic habitats, including brackish and highly disturbed waters (Tweedley et al, 2017). Through consumptive effects, bioturbation and nutrient excretion, goldfish can facilitate a shift from clearer, macrophyte‐dominated water to more turbid, muddy conditions (Razlutskij et al, 2021; Richardson et al, 1995).…”

Section: Introductionmentioning

confidence: 99%

Non‐native fish facilitate non‐native snails and alter food web structure in experimental pond communities

2023

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1. Contemporary ecosystems commonly support multiple non-native species, which can alter community structure and directly or indirectly interact with one another. Novel interactions between invasive species can result in the facilitation or suppression of one or both invaders, making it important to understand the underlying mechanisms that affect invasion outcomes. Goldfish Carassius auratus and Chinese mystery snails Cipangopaludina chinensishave been introduced widely through the aquarium trade and co-occur in their non-native ranges. We used an outdoor mesocosm experiment to assess separate and combined effects of goldfish and mystery snails on urban pond community structure and to investigate whether goldfish and mystery snails affected one another positively, neutrally or negatively. We predicted that the distinct trophic levels of each species and the anti-predator traits of mystery snails would lead to positive interactions between invaders and synergistic effects on the aquatic community.3. Goldfish directly increased turbidity and decreased filamentous algae, zooplankton, juvenile native snails and survival of amphibians via consumptive effects. Goldfish indirectly increased periphyton, phytoplankton and body size of surviving native green frogs Lithobates clamitans through trophic cascades and/or release from competition. Mystery snails had more subtle effects including reducing growth rates of native grey tree frogs Hyla versicolor, likely through competitive interactions.4. With goldfish present, mystery snails showed increased reproductive success (higher biomass of juveniles), likely due to indirect competitive release from other herbivores. In contrast to their effects on native snails, goldfish did not consume juvenile mystery snails, likely due to their unique traits (e.g. large size and shell thickness). Mystery snails slightly reduced goldfish growth but did not affect their survival.5. These results suggest unidirectional facilitation between invaders via indirect changes in the food web. Overall, our study found strong direct and indirect effects of invasive aquarium species, particularly goldfish, and provides

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“…Bunbury (e.g. Veale et al, 2014;Potter et al, 2016;Valesini et al, 2018), less focus has been 50 placed on smaller, more regional estuaries (Tweedley et al, 2017a;. 51…”

Section: Introduction 33mentioning

confidence: 99%

Baseline survey of the fish and invertebrate fauna of Hill Inlet, the northernmost estuary in south-western Australia

Tweedley

Sama

Poh

et al. 2020

Preprint

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10Microtidal estuaries in Mediterranean climates are particularly vulnerable to the effects of 11 anthropogenic degradation. This study provides the first data on the fish and benthic 12 macroinvertebrate fauna of Hill Inlet, the northernmost estuary in south-western Australia. 13Sampling was conducted in June 2019 (Austral winter), when water levels were very high due 14to recent heavy rainfall and the bar at the mouth of the estuary was intact. Surface salinities 15 were oligohaline and declined along the longitudinal axis, ranging from 12 to 3. A marked 16 halocline was present at most sites, resulting in pronounced hypoxia. High water levels 17 precluded the use of a seine net at some sites to sample the nearshore fish fauna, however, two 18 species were recorded (Pseudogobius olorum and Acanthopagrus butcheri), both of which 19 complete their life-cycle within the estuary. Deeper, offshore waters, sampled using gill nets, 20 yielded only four species (Mugil cephalus, A. butcheri, Adrichetta forsteri and Pomatomus 21 saltatrix), due to the bar at the mouth of the estuary being closed prior to sampling thus limiting 22 recruitment from marine species. Ten benthic macroinvertebrates species were collected, 23 representing mainly polychaetes, molluscs and crustaceans. The low number of species was 24 likely caused by the hypoxia present throughout most of the bottom waters. Although these 25 data represent a benchmark against which future changes can be detected, it is recommended 26 that additional sampling is conducted when water levels are lower and the bar has been open 27 to provide a more holistic assessment of the fauna of Hill Inlet. 28 29Running head: Fish and invertebrate fauna of Hill Inlet 30

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Baseline survey of the fish fauna of a highly eutrophic estuary and evidence for its colonisation by Goldfish (Carassius auratus)

Cited by 8 publications

References 50 publications

Biodiversity assessment across a dynamic riverine system: A comparison of eDNA metabarcoding versus traditional fish surveying methods

Biodiversity assessment across a dynamic riverine system: A comparison of eDNA metabarcoding versus traditional fish surveying methods

Non‐native fish facilitate non‐native snails and alter food web structure in experimental pond communities

Baseline survey of the fish and invertebrate fauna of Hill Inlet, the northernmost estuary in south-western Australia

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