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Heavy loads of parasitic freshwater pearl mussel (Margaritifera margaritifera L.) larvae impair foraging, activity and dominance performance in juvenile brown trout (Salmo trutta L.)

Artikel i vetenskaplig tidskrift
Författare Karl Filipsson
Tina Petersson
Johan Höjesjö
John J. Piccolo
Joacim Näslund
Niklas Wengström
E. Martin Österling
Publicerad i Ecology of Freshwater Fish
Volym 27
Nummer/häfte 1
Sidor 70-77
ISSN 0906-6691
Publiceringsår 2018
Publicerad vid Institutionen för biologi och miljövetenskap
Sidor 70-77
Språk en
Länkar doi.org/10.1111/eff.12324
Ämnesord Behaviour, Brown trout, Glochidia, Host, Parasite
Ämneskategorier Limnisk ekologi, Etologi och beteendeekologi, Ekologi

Sammanfattning

© 2016 John Wiley & Sons A/S.The life cycle of the endangered freshwater pearl mussel (Margaritifera margaritifera) includes a parasitic larval phase (glochidia) on the gills of a salmonid host. Glochidia encystment has been shown to affect both swimming ability and prey capture success of brown trout (Salmo trutta), which suggests possible fitness consequences for host fish. To further investigate the relationship between glochidia encystment and behavioural parameters in brown trout, pairs (n = 14) of wild-caught trout (infested vs. uninfested) were allowed to drift feed in large stream aquaria and foraging success, activity, agonistic behaviour and fish coloration were observed. No differences were found between infested and uninfested fish except for in coloration, where infested fish were significantly darker than uninfested fish. Glochidia load per fish varied from one to several hundred glochidia, however, and high loads had significant effects on foraging, activity and behaviour. Trout with high glochidia loads captured less prey, were less active and showed more subordinate behaviour than did fish with lower loads. Heavy glochidia loads therefore may negatively influence host fitness due to reduced competitive ability. These findings have implications not only for management of mussel populations in the streams, but also for captive breeding programmes which perhaps should avoid high infestation rates. Thus, low levels of infestation on host fish which do not affect trout behaviour but maintains mussel populations may be optimal in these cases.

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