Invasive gibel carp use vacant space and occupy lower trophic niche compared to endangered native crucian carp

Tapkir, Sandip D.; Thomas, Kiran; Kalous, Lukáš; Vašek, Mojmír; Meador, Travis B.; Šmejkal, Marek

doi:10.1007/s10530-023-03081-9

Cited by 8 publications

(9 citation statements)

References 86 publications

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“…Furthermore, being an apex predator itself, along with the absence of other predators such as sharks that are long been locally extinct in the region (Cardeñosa et al, 2022), implies that there is essentially no restraint to TGGG population growth through top-down control in the food chain (Baum & Worm, 2009). The TGGG occupation on vacant dietary niches among local species suggests an additional potential of introduction success, as unoccupied niches are found to be linked with successful establishment of introduced species in aquatic ecosystem (González-del-Pliego et al, 2023; Tapkir et al, 2023). Together with evidence from laboratory settings that TGGG can produce viable F2 offspring (Ching et al, 2018), there is potential for the establishment of TGGG locally.…”

Section: Discussionmentioning

confidence: 99%

Distinct resource utilization by introduced man-made grouper hybrid: an overlooked anthropogenic impact from a longstanding religious practise

Chung,

Schunter

2023

Preprint

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Anthropogenic activities, such as non-native aquaculture species introduction have been considerably altering trophic interactions in marine ecosystems. The hybrid grouper (TGGG), an aquaculture product originated from artificial F1 crossbreed between Epinephelus fuscoguttatus and E. lanceolatus, have been released in the wild through religious activities, raising concerns about this man-made introduced species. The carnivorous diet, together with large body size inherited from the parental species have made TGGG a candidate that could pose significant impacts to the marine ecosystem. Yet, little is known about the diet composition of TGGG upon release into the natural environment, and any dietary overlap or partition with closely related endemic species. Here, we deploy gut content DNA metabarcoding to determine the prey richness and dietary niche of wild caught TGGG and compare with four native grouper species (Epinephelus awoara, E. bleekeri, E. coioides and E. quoyanus). The TGGG exhibited six unique prey taxa with teleosts being the major taxa preyed upon followed by crustaceans and cephalopods and displayed significant lower mean number of pray taxa compared to other groupers. The TGGG exhibits a significantly different diet composition, possibly indicating a diet transitioning and acquiring new feeding behavior. This study provides a comprehensive analysis with high taxonomic resolution on the diet of artificial hybrids in the wild, suggesting possibility of introduction success if release events persist. Finally, these findings provide new information on how local trophic dynamics are impacted by under-investigated release of animals through religious practices.

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Section: Discussionmentioning

confidence: 99%

Distinct resource utilization by introduced man-made grouper hybrid: an overlooked anthropogenic impact from a longstanding religious practise

Chung,

Schunter

2023

Preprint

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“…However, the very few reported weight-based concentrations of MPs, regardless of the matrix, were higher or similar to those used in the present study, and we thus believe that our exposure concentrations can be considered relevant and useful, particularly for foundational studies such as the present one. In order to more accurately replicate the experimental conditions such as concentration and modes of ingestion in the wild, a more natural scenario and typical ingestion of filter feeders like Daphnia can be developed for future work based on these behavioural experiments.With respect to the studied species, it may be expected that native crucian carp receives a slightly higher dose of contaminants than gibel carp since the trophic position of crucian carp is higher (feeding solely on zooplankton and benthic invertebrate prey) (Batel et al, 2016;Farrell and Nelson, 2013;Setälä et al, 2014), while part of the gibel carp diet consists of plant material (de Meo et al, 2022;Özdilek and Jones, 2014;Tapkir et al, 2023).…”

Section: Relevance For Species and Environmentmentioning

confidence: 99%

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

Gorule,

Šmejkal,

Tapkir

et al. 2024

Science of The Total Environment

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“…Subsequently, the scales and fin clips were oven-dried at 60 °C for 24 h. Due to the small size of some fish scales and fin clips and their limited number available for analysis, they were not homogenised into a powder, as this would lead to the loss of some of the valuable material. Instead, the samples were cut into fine slices (like a pie) and 0.363-1.084 mg of the sample was then weighed into a tin capsule (Tapkir et al 2023). Since a comparative analysis of acidified freshwater fish scales did not show a substantial effect of the inorganic C fraction on the resulting δ 13 C values of total C versus organic C in fish scales (Ventura and Jeppesen 2010), we decided not to decalcify our scale samples by acid treatment.…”

Section: Stable Isotope Analysismentioning

confidence: 99%

“…iv. Finally, we expected that, due to increased competition over shared resources with the presence of a third fish species in the community, the gibel carp (Tapkir et al 2023), the overlap of the isotopic niches of crucian carp and topmouth gudgeon will be larger.…”

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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Invasive gibel carp use vacant space and occupy lower trophic niche compared to endangered native crucian carp

Cited by 8 publications

References 86 publications

Distinct resource utilization by introduced man-made grouper hybrid: an overlooked anthropogenic impact from a longstanding religious practise

Distinct resource utilization by introduced man-made grouper hybrid: an overlooked anthropogenic impact from a longstanding religious practise

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

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

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