Sammanfattning

Invasive species are considered as one of the major threats for biodiversity worldwide. The Ponto-Caspian species Dikerogammarus villosus, for instance, spread throughout continental Europe and was recorded for the first time also within Lake Constance in 2003. Although D. villosus is a highly competitive species it was not capable of replacing the native Ganunarus roeselii completely in this ecosystem, especially in the riparian zones of the highly agriculturally used island "Reichenau". As differences in pesticide sensitivity between both amphipod species may explain their distribution, the present study assessed the implication of the highly toxic pyrethroid lambda-cyhalothrin, which is authorized for application in the Lake Constance region, assuming the invasive species being more sensitive than the native one. However, both the feeding activity bioassays, which measured the leaf consumption over 7 d (n = 20), as well as the predation bioassay, which measured the predation rate upon Baetis nymphs in concert with the feeding activity on leaf material over 96 h (n = 13), revealed an up to 5-fold higher tolerance of D. villosus towards lambda-cyhalothrin. These results suggest the investigated insecticide not being the trigger for the observed distribution pattern of both amphipod species. Hence, other factors like the diversity of habitat structures or the levels of ammonia may have facilitated the coexistence. Nevertheless, the present study uncovered a high leaf-shredding efficacy of the invasive species D. villosus suggesting that its role in the leaf decomposition process may have been underestimated in the past. (C) 2013 Elsevier Ltd. All rights reserved.

Nyckelord

Functional feeding group; Insecticide; Leaf litter decomposition; Ecosystem function; Predator-prey interaction; Freshwater biodiversity

Publicerad i

Chemosphere
2013, Volym: 92, nummer: 5, sidor: 483-489
Utgivare: PERGAMON-ELSEVIER SCIENCE LTD

SLU författare

• Bundschuh, Mirco

  • Institutionen för vatten och miljö, Sveriges lantbruksuniversitet
    

Globala målen

Säkerställa tillgången till och en hållbar förvaltning av vatten och sanitet för alla
Skydda, återställa och främja ett hållbart nyttjande av landbaserade ekosystem, hållbart bruka skogar, bekämpa ökenspridning, hejda och vrida tillbaka markförstöringen samt hejda förlusten av biologisk mångfald


UKÄ forskningsämne

Annan biologi


Publikationens identifierare

DOI: https://doi.org/10.1016/j.chemosphere.2013.01.106

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/50479