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Numerical and functional responses to the presence of a competitor – the case of Aggregata sp. (Apicomplexa: Aggregatidae) and Octopicola superba (Copepoda: Octopicolidae)

Published online by Cambridge University Press:  22 October 2013

F. I. CAVALEIRO  and
M. J. SANTOS
F. I. CAVALEIRO*
Affiliation:
Faculdade de Ciências, Departamento de Biologia, Universidade do Porto, Rua do Campo Alegre, s/n, Edifício FC4, 4169-007 Porto, Portugal CIIMAR/CIMAR – Centro Interdisciplinar de Investigação Marinha e Ambiental, Universidade do Porto, Rua dos Bragas 289, 4050-123 Porto, Portugal
M. J. SANTOS
Affiliation:
Faculdade de Ciências, Departamento de Biologia, Universidade do Porto, Rua do Campo Alegre, s/n, Edifício FC4, 4169-007 Porto, Portugal CIIMAR/CIMAR – Centro Interdisciplinar de Investigação Marinha e Ambiental, Universidade do Porto, Rua dos Bragas 289, 4050-123 Porto, Portugal
*
* Corresponding author: Faculdade de Ciências, Departamento de Biologia, Universidade do Porto, Rua do Campo Alegre, s/n, Edifício FC4, 4169-007 Porto, Portugal. E-mail: francisca.cavaleiro@gmail.com
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Summary

Evidence of interference competition between the eimeriorin coccidian Aggregata sp. and the octopicolid copepod Octopicola superba at the level of the gills of naturally infected Octopus vulgaris is evaluated. Numerical and functional responses are considered for analysis, and the fundamental and realized spatial niches (FSNs and RSNs) are measured as part of the study. While it was not possible to measure the FSN of Aggregata sp., the analysis of the infection levels of O. superba recorded for non-concomitantly and concomitantly infected hosts suggests that the gills and body skin constitute, respectively, the main and accessory sites of infection of the parasite. According to the evidence found, the gills function mainly as an accessory site of infection of Aggregata sp., in specimens in which the caecum and intestine are massively infected. Evidence for a negative interaction between Aggregata sp. and O. superba has been found while controlling for a potential confounding effect of host size. Furthermore, the presence of O. superba on gill lamellae appears to have been negatively affected by the presence of Aggregata sp., while this latter remained mostly undisturbed. The mean number of oocysts of Aggregata sp. in the gills was higher in spring and summer, which were also the seasons presenting the broadest RSN for O. superba.

Keywords

Aggregata sp.Octopicola superbaOctopus vulgarisnon-concomitantly and concomitantly infected hostsfundamental spatial nicherealized spatial nichenumerical and functional evidence of interference competitiongills
Type
Research Article
Information
Parasitology , Volume 141 , Issue 2 , February 2014 , pp. 216 - 226
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Copyright
Copyright © Cambridge University Press 2013 

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