Determining the strength of exploitative competition from an introduced fish:roles of density, biomass and body size

Britton, J. Robert and Cucherousset, J and Grey, Jonathan and Gozlan, R. E. (2011) Determining the strength of exploitative competition from an introduced fish:roles of density, biomass and body size. Ecology of Freshwater Fish, 20 (1). pp. 74-79. ISSN 1600-0633

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Abstract

As species introductions can result in increased resource competition for coexisting species in the receiving ecosystems, the effects of increased exploitative competition for limited food resources from an introduced fish (Pseudorasbora parva) on a coexisting fish (Cyprinus carpio) were tested experimentally using a substitutive–additive design. Additive treatments revealed that the growth of C. carpio was significantly suppressed following the introduction of P. parva with the magnitude of growth suppression directly proportional to P. parva density and biomass. A substitutive treatment that tested for the effect of intraspecific competition revealed that when C. carpio were introduced at a similar biomass to P. parva, there was no significant difference in the extent of the suppressed growth. At the same density, however, the effect of C. carpio (higher biomass) on growth was significantly above that of P. parva (lower biomass). This was independent of the initial body sizes of the introduced fishes. Thus, the interspecific competition imposed by P. parva was only as strong as the intraspecific competition of C. carpio when present at a similar biomass.

Item Type:
Journal Article
Journal or Publication Title:
Ecology of Freshwater Fish
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1100/1104
Subjects:
ID Code:
74640
Deposited By:
Deposited On:
13 Jul 2015 15:38
Refereed?:
Yes
Published?:
Published
Last Modified:
27 Oct 2020 05:00