Consistent patterns of trophic niche specialisation in host populations infected with a non-native copepod parasite.

Pegg, J., Andreou, D., Williams, C.F. and Britton, J.R., 2017. Consistent patterns of trophic niche specialisation in host populations infected with a non-native copepod parasite. Parasitology. (In Press)

Full text available as:

[img] PDF
E briani Parasitology_accepted.pdf - Accepted Version
Restricted to Repository staff only
Available under License Creative Commons Attribution Non-commercial No Derivatives.

298kB

Abstract

Populations of generalist species often comprise of smaller sub-sets of relatively specialised individuals whose niches comprise small sub-sets of the overall population niche. Here, the role of parasite infections in trophic niche specialisation was tested using five wild fish populations infected with the non-native parasite Ergasilus briani, a copepod parasite with a direct lifecycle that infects the gill tissues of fish hosts. Infected and uninfected fishes were sampled from the same habitats during sampling events. Prevalence in the host populations ranged between 16 and 67 %, with parasite abundances of up to 66 parasites per fish. Although pathological impacts included hyperplasia and localised haemorrhaging of gill tissues, there were no significant differences in the length, weight and condition of infected and uninfected fishes. Stable isotope analyses (δ13C, δ15N) revealed that the trophic niche of infected fishes, measured as standard ellipse area (i.e. the isotopic niche), was consistently and significantly smaller compared to uninfected conspecifics. These niches of infected fishes always sat within that of uninfected fish, suggesting trophic specialisation in hosts. These results suggested trophic specialisation is a potentially important non-lethal consequence of parasite infection that results from impaired functional traits of the host.

Item Type:Article
ISSN:0031-1820
Uncontrolled Keywords:Non-native parasite; stable isotope analysis; Rutilus rutilus; Abramis brama; niche constriction; Ergasilus briani
Subjects:UNSPECIFIED
Group:Faculty of Science & Technology
ID Code:26374
Deposited By: Unnamed user with email symplectic@symplectic
Deposited On:18 Jan 2017 13:48
Last Modified:18 Jan 2017 13:48

Downloads

Downloads per month over past year

More statistics for this item...
Repository Staff Only -