Abstract
Successful invasive species compete for the same available resources with related native species, frequently driving the latter to the cusp of extirpation because of a lack of adaptive response. In this paper we analysed the behavioural relationships between two species of crayfish, the native Astacus leptodactylus and the invasive Orconectes limosus in an ongoing invasion process in the Lower Danube, in Eastern Europe. We tested the species’ ability to acquire shelter and food in laboratory experiments in both intra- and interspecific confrontations. The dominant behaviour of the invasive species is obvious even towards its own congeners, while the native species display a more tolerant conspecific behaviour. With respect to interspecific confrontation, the invasive crayfish males and females were inclined to sex-specific dominance regarding shelters. A roughly balanced behaviour was noted for intersexual confrontations. The results of this study also highlight that the occupancy of a shelter is more disputed than food resources, which appear to be opportunistically acquired. In the context of the current invasion process, we hypothesised that the effect caused by interference competition might lead to a decline of the native species. Further investigations may reveal if there is any hope for recovery of the native species.
Acknowledgements
This work was supported by a grant of the Romanian National Authority for Scientific Research and Innovation, CNCS – UEFISCDI, project number PN-II-RU-TE-2014-4-0785. The authors would like to thank Claudia Zaharia for the valuable advice and support in the writing of this manuscript and Paul Richard Nicolau for providing A. leptodactylus individuals involved in the experiment.
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© 2017 Institute of Zoology, Slovak Academy of Sciences
Articles in the same Issue
- Cellular and Molecular Biology
- Two nuclei inside a single cardiac muscle cell. More questions than answers about the binucleation of cardiomyocytes
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Articles in the same Issue
- Cellular and Molecular Biology
- Two nuclei inside a single cardiac muscle cell. More questions than answers about the binucleation of cardiomyocytes
- Cellular and Molecular Biology
- Purification and characterization of α-L-arabinofuranosidases from Geobacillus stearothermophilus strain 12
- Botany
- Impact of vegetation on flow in a lowland stream during the growing season
- Zoology
- Soil moisture distribution mapping in topsoil and its effect on maize yield
- Botany
- Influence of beech and spruce sub-montane forests on snow cover in Poľana Biosphere Reserve
- Botany
- Seedling emergence through soil surface seals under laboratory conditions: effect of mechanical impedance and seal moisture
- Botany
- Overexpression of Arabidopsis ICR1 gene affects vegetative growth and anthesis
- Zoology
- Experimental evidence of the successful invader Orconectes limosus outcompeting the native Astacus leptodactylus in acquiring shelter and food
- Zoology
- Temporary deleterious mass mutations relate to originations of cockroach families
- Zoology
- Dynamics of the bird communities in two fragments of Atlantic Forest in São Paulo, Brazil
- Zoology
- Morpho-metric analysis of the insular and mainland Rattus in Tunisia
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- The role of melatonin and carnosine in prevention of oxidative intestinal injury induced by gamma irradiation in rats
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- The in vitro effect of poly (I:C) on cell morphology of a metastatic pharyngeal cell line
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