Experimental evidence of chemical attraction in the mutualistic zebra mussel-killer shrimp system

PeerJ

article

Matteo Rolla¹  Sofia Consuegra¹  Eleanor Carrington¹  David J. Hall²  Carlos Garcia de Leaniz¹ 

[1] Department of BioSciences, Centre for Sustainable Aquatic Research, Swansea University;Cardiff Harbour Authority

关键词: Synergy;    Invasive species;    Zebra mussel;    Killer shrimp;    Kairomones;    Invasion meltdown;    Sympatry;    Group behaviour;    Chemical attraction;    Invasion facilitation;   

DOI  :  10.7717/peerj.8075

学科分类：社会科学、人文和艺术（综合）

来源: Inra

【 摘 要 】

Invasion facilitation, whereby one species has a positive effect on the establishment of another species, could help explain the rapid colonisation shown by some freshwater invasive species, but the underlying mechanisms remain unclear. We employed two-choice test arenas to test whether the presence of zebra mussel (Dreissena polymorpha) could facilitate the establishment of the killer shrimp (Dikerogammarus villosus). Killer shrimp preferred to settle on mats of zebra mussel, but this was unrelated to mat size, and was not different from attraction shown to artificial grass, suggesting that zebra mussel primarily provides substrate and refuge to the killer shrimp. Killer shrimp were strongly attracted to water scented by zebra mussel, but not to water scented by fish. Chemical attraction to the zebra mussel’s scent did not differ between sympatric and allopatric populations of killer shrimp, suggesting that chemical attraction is not an acquired or learned trait. Our study shows, for the first time, chemical attraction between two highly invasive freshwater species, thereby providing a plausible mechanism for invasion facilitation. This has implications for managing the spread of killer shrimp, and perhaps other freshwater invasive species, because chemical attraction could significantly increase establishment success in mutualistic systems. Failure to consider invasion facilitation may underestimate the risk of establishment, and likely also the impact of some aquatic invaders.

【 授权许可】

CC BY