Behavioural responses of invasive (Gmelinoides fasciatus) and native (Gammarus lacustris) amphipods to predators on different bottom substrates
Laen...
Kuupäev
2023
Kättesaadav alates
Autorid
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Springer Nature
Abstrakt
The amphipod Gmelinoides fasciatus has
invaded and established in numerous large lakes in
Eurasia and, in the process, has displaced the native
amphipod, Gammarus lacustris. The mechanism
behind its invasion success is unclear and remains
an important topic for invasion ecology. Three labo-
ratory experiments were conducted to determine if
superior predator avoidance and different types of
bottom substrate could be important factors contrib-
uting to the invasion success of G. fasciatus. Our
results indicate that, on gravel and sand substrates,
G. fasciatus exhibited superior digging behaviour to
avoid predation by fishes (perch and common roach),
contrary to G. lacustris. On sandy substrate, only 9%
of G. fasciatus individuals were consumed, whereas
G. lacustris were consumed much more intensively at 74%. In addition, G. fasciatus exhibited a more sub-
stantial reduction in activity, where the time spent in
motion reduced from 37.6 to 20.8% compared to G.
lacustris (from 21.8 to 17.4%) when in the presence
of predatory fish kairomones. G. fasciatus movement
speed was also reduced in the presence of kairomones
(from 57.1 to 39.3 mm/s). However, the presence of
kairomones had little effect on digging behaviour of
G. fasciatus. G. fasciatus consistently demonstrated
superior predator avoidance abilities over G. lacus-
tris, suggesting that this mechanism might play an
important role in the invasion success of G. fasciatus.
We would like to thank Henn Timm for assistance in the field and conceptualising ideas. Additional assistance in the field was provided by Mihkel Treufeldt and Ott Mõtus. Mark McCarthy helped to proofread the manu- script. This project was financed by the Estonian Environmental Investment Centre (Project Number 16442) and by Estonian University of Life Sciences (Project Number P190254PKKH). This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 951963. All work was carried out in the Cen- tre for Limnology station of the Estonian University of Life Sciences.
We would like to thank Henn Timm for assistance in the field and conceptualising ideas. Additional assistance in the field was provided by Mihkel Treufeldt and Ott Mõtus. Mark McCarthy helped to proofread the manu- script. This project was financed by the Estonian Environmental Investment Centre (Project Number 16442) and by Estonian University of Life Sciences (Project Number P190254PKKH). This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 951963. All work was carried out in the Cen- tre for Limnology station of the Estonian University of Life Sciences.
Kirjeldus
Märksõnad
macroinvertebrate ecology, freshwater fish, locomotor activity, predator avoidance, kairomones, alien species, articles