Long-term sublethal exposure to polyethylene and tire wear particles: Effects on risk-taking behaviour in invasive and native fish

Gorule, Pankaj A.; Šmejkal, Marek; Tapkir, Sandip; Stepanyshyna, Yevdokiia; Stejskal, Vlastimil; Follesa, Maria Cristina; Cau, Alessandro

doi:10.1016/j.scitotenv.2023.168233

Cited by 6 publications

(1 citation statement)

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“…Wetlands have been disconnected from the river main channels by river floodplain canalisation and land conversion, while the construction of dams has resulted in the loss of natural flow dynamics (Grizzetti et al 2017;Hayes et al 2018). Pollution and eutrophication of these ecosystems further degrade their functioning (Kingsford et al 2016) and can act in synergy with other stressors, negatively impacting native species (Gorule et al 2024). Furthermore, wetland ecosystems often harbour invasive species (Glińska-Lewczuk et al 2016) and many freshwater fish species which have adapted to these conditions are at risk of severe decline (Sayer et al 2011;Van Wichelen et al 2022).…”

Section: Introductionmentioning

confidence: 99%

Isotopic niches reveal the impact of topmouth gudgeon and gibel carp on native crucian carp

Šmejkal,

Thomas,

Šmejkalová

et al. 2024

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Invasive species pose a major threat to natural ecosystems and directly outcompete many native species, placing them at imminent threat of extinction. The topmouth gudgeon (Pseudorasbora parva) is on the EU’s blacklist of invasive freshwater species and threatens biodiversity, especially in wetland and floodplain ecosystems, aquacultures and village ponds. The crucian carp (Carassius carassius) is native to Europe and its populations have declined in large part of its native range, with invasive gibel carp (C. gibelio) suspected as a major cause of its decline. Invasions by topmouth gudgeon have been implicated in the decline of crucian carp populations but this still needs to be verified. The aim of this study was to evaluate by the experimental approach the competitive interaction between the two species, topmouth gudgeon and crucian carp, focusing on isotopic niche sizes and their overlap in syntopy. A four-month mesocosm experiment was performed to determine the isotopic niche of crucian carp and topmouth gudgeon living alone and in syntopy. Additionally, stable isotope data were collected at the sites where the two species co-occur to compare niche sizes and overlaps. Experimental data showed that the isotopic space of topmouth gudgeon responded more flexibly (reducing niche size at syntopy) than that of the crucian carp and confirmed a high isotopic niche overlap between the species. Field studies have shown that topmouth gudgeon has invaded the isotopic niche of the crucian carp, especially when another invasive species, the gibel carp, lived in the community (25% at 40% ellipse area and 50% at 95% ellipse area). When only the topmouth gudgeon and crucian carp were present in the field, the overlap was lower (3% and 48%, respectively) and directional overlap modelling showed that the crucian carp was more likely to invade the isotopic niche of topmouth gudgeon than vice versa. The data indicated that competition between crucian carp and topmouth gudgeon is likely, especially in syntopy with other invasive species. This study shows that the feeding plasticity of topmouth gudgeon likely facilitates its establishment outside its native range and, due to high isotopic niche overlap, threatens native fish with similar feeding ecology with competitive displacement.

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