New species, new story: The impact of invasive non-host predators on host-trematode interactions

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60077344%3A_____%2F23%3A00580599" target="_blank" >RIV/60077344:_____/23:00580599 - isvavai.cz</a>

Výsledek na webu

<a href="https://onlinelibrary.wiley.com/doi/10.1111/fwb.14155" target="_blank" >https://onlinelibrary.wiley.com/doi/10.1111/fwb.14155</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1111/fwb.14155" target="_blank" >10.1111/fwb.14155</a>

Jazyk výsledku

angličtina

Název v původním jazyce

New species, new story: The impact of invasive non-host predators on host-trematode interactions

Popis výsledku v původním jazyce

Predation is considered one of the key drivers shaping the relationships between animals. There is increasing evidence that non-host aquatic taxa use free-living parasite stages as prey, including motile cercariae of digenean trematodes. However, species-specific predator differences in cercarial consumption are poorly understood, especially when invasive consumers are involved. We used experimental approaches to investigate the possible predator-induced reduction in trematode-host encounters in freshwater benthic communities. Four gammarid species, two native European (Gammarus jazdzewskii and G. pulex) and two invasive Ponto-Caspian (Dikerogammarus villosus and Pontogammarus robustoides), were selected as predators of echinostomatid cercariae (Echinoparyphium aconiatum). We hypothesised that (i) all predators will prey on cercariae, but the amount of prey consumed will vary, the invaders will be more voracious than native species, and (ii) the effect of predator-induced dilution of cercariae will depend on the environmental condition, i.e., the presence of the natural target host (the planorbid snail Planorbarius corneus) and alternative food resource, the exposure of predators to these two basic environmental factors will reduce their consumption rates of cercariae. The extent of the dilution effect caused by gammarids was highly predator species-dependent and also varied depending on experimental conditions. Overall, all gammarids preyed on cercariae and reduced infection levels in the target snail host, but the invaders were more efficient than the native species. Furthermore, decreased consumption rates of cercarial prey were observed in the presence of both the target snail hosts and alternative food resources, except for invasive P. robustoides consuming more cercariae when a snail host was present. The observed differences among predators in the consumption of cercariae may be a result of complex interaction traits of parasites, predators and target hosts, such as different predatory behaviour of invasive and native amphipods, change in parasite behaviour in response to the presence/chemical signals of the target host and a predator-induced ecology of fear interfering with the dilution effect of parasites. We provided evidence that gammarids can cause a significant reduction in parasite-host encounters. The high consumption rates, especially in the presence of easily available alternative food resources, emphasise the importance of free-living cercariae as an energy resource in aquatic food webs. The observed predator differences in the consumption of cercariae are further evidence of the higher competitive ability of invasive species. Simultaneously, our results indicate that the appearance of new predators in the environment may interfere with established host-parasite interactions.

Název v anglickém jazyce

New species, new story: The impact of invasive non-host predators on host-trematode interactions

Popis výsledku anglicky

Predation is considered one of the key drivers shaping the relationships between animals. There is increasing evidence that non-host aquatic taxa use free-living parasite stages as prey, including motile cercariae of digenean trematodes. However, species-specific predator differences in cercarial consumption are poorly understood, especially when invasive consumers are involved. We used experimental approaches to investigate the possible predator-induced reduction in trematode-host encounters in freshwater benthic communities. Four gammarid species, two native European (Gammarus jazdzewskii and G. pulex) and two invasive Ponto-Caspian (Dikerogammarus villosus and Pontogammarus robustoides), were selected as predators of echinostomatid cercariae (Echinoparyphium aconiatum). We hypothesised that (i) all predators will prey on cercariae, but the amount of prey consumed will vary, the invaders will be more voracious than native species, and (ii) the effect of predator-induced dilution of cercariae will depend on the environmental condition, i.e., the presence of the natural target host (the planorbid snail Planorbarius corneus) and alternative food resource, the exposure of predators to these two basic environmental factors will reduce their consumption rates of cercariae. The extent of the dilution effect caused by gammarids was highly predator species-dependent and also varied depending on experimental conditions. Overall, all gammarids preyed on cercariae and reduced infection levels in the target snail host, but the invaders were more efficient than the native species. Furthermore, decreased consumption rates of cercarial prey were observed in the presence of both the target snail hosts and alternative food resources, except for invasive P. robustoides consuming more cercariae when a snail host was present. The observed differences among predators in the consumption of cercariae may be a result of complex interaction traits of parasites, predators and target hosts, such as different predatory behaviour of invasive and native amphipods, change in parasite behaviour in response to the presence/chemical signals of the target host and a predator-induced ecology of fear interfering with the dilution effect of parasites. We provided evidence that gammarids can cause a significant reduction in parasite-host encounters. The high consumption rates, especially in the presence of easily available alternative food resources, emphasise the importance of free-living cercariae as an energy resource in aquatic food webs. The observed predator differences in the consumption of cercariae are further evidence of the higher competitive ability of invasive species. Simultaneously, our results indicate that the appearance of new predators in the environment may interfere with established host-parasite interactions.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10617 - Marine biology, freshwater biology, limnology

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Freshwater Biology

ISSN

0046-5070

e-ISSN

1365-2427

Svazek periodika

68

Číslo periodika v rámci svazku

JULY

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

12

Strana od-do

1602-1613

Kód UT WoS článku

001035448300001

EID výsledku v databázi Scopus

2-s2.0-85165679761