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Combined effects of flow condition and parasitism on shoaling behaviour of female guppies Poecilia reticulata

Hockley, Frances Anne, Wilson, Catherine, Graham, Nicola and Cable, Joanne 2014. Combined effects of flow condition and parasitism on shoaling behaviour of female guppies Poecilia reticulata. Behavioral Ecology and Sociobiology 68 (9) , pp. 1513-1520. 10.1007/s00265-014-1760-5

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Abstract

Group living in fish can provide benefits of protection from predators and some parasites, more efficient foraging for food, increased mating opportunities and enhanced energetic benefit when swimming. For riverine species, shoaling behaviour can be influenced by various environmental stressors, yet little is known how flow rate might influence the shoaling of diseased fish shoals. In view of the increasingly unpredictable flow rates in streams and rivers, this study aimed to assess the combined effect of flow condition and parasitism on the shoaling behaviour of a model fish species. Shoal size, shoal cohesion and time spent shoaling of female guppies Poecilia reticulata were compared when infected with the directly transmitted ectoparasite Gyrodactylus turnbulli under flow and static conditions. Flow condition was an important factor in influencing shoaling behaviour of guppies with the fish forming larger shoals in the absence of flow. When a shoal member was infected with G. turnbulli, shoal cohesion was reduced, but the magnitude of this effect was dependent on flow condition. In both flow and static conditions, bigger fish formed larger shoals than smaller counterparts. Future changes to stream hydrology with more frequent flooding and drought events will affect the shoaling tendency of fish. During high-flow events, diseased fish may not be able to keep up with shoal mates and therefore have a higher risk of predation. Additionally, these findings may be important for aquaria and farmed species where an increase in flow rate may reduce aggregation in fish.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Engineering
Uncontrolled Keywords: Cohesion; Flow rate; Flume; Nearest neighbour distance; Shoal size; Social groups
Publisher: Springer
ISSN: 0340-5443
Funders: BBSRC
Date of First Compliant Deposit: 30 March 2016
Date of Acceptance: 17 June 2014
Last Modified: 16 Mar 2020 14:12
URI: http://orca-mwe.cf.ac.uk/id/eprint/61772

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