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2017 ; 116
(6
): 1653-1663
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Consequences of eye fluke infection on anti-predator behaviours in invasive round
gobies in Kalmar Sound
#MMPMID28386680
Flink H
; Behrens JW
; Svensson PA
Parasitol Res
2017[Jun]; 116
(6
): 1653-1663
PMID28386680
show ga
Larvae of the eye fluke, Diplostomum, emerge from snails and infect fish by
penetrating skin or gills, then move to the lens where they may impair the vision
of the fish. For the fluke to reproduce, a bird must eat the infected fish, and
it has been suggested that they therefore actively manipulate the fish's
behaviour to increase the risk of predation. We found that round gobies Neogobius
melanostomus, a species that was recently introduced to the Kalmar Sound of the
Baltic Sea, had an eye fluke prevalence of 90-100%. We investigated how the
infection related to behavioural variation in round gobies. Our results showed
that the more intense the parasite-induced cataract, the weaker the host's
response was to simulated avian attack. The eye flukes did not impair other
potentially important anti-predator behaviours, such as shelter use, boldness and
the preference for shade. Our results are in accordance with the suggestion that
parasites induce changes in host behaviour that will facilitate transfer to their
final host.