The Role of Learning in Fish Orientation

Odling-Smee, Lucy; Simpson, Stephen D.; Braithwaite, Valerie

doi:10.1002/9780470996058.ch7

Cited by 35 publications

(36 citation statements)

References 113 publications

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“…Downstream migration behaviour is crucial in the life cycle of salmon, and the timing and intensity of the migration is adaptive as it impacts survival and fitness of the fish626. An emotional adaptation27, where selection acts on anxiety phenotypes that generates a migration response matching the specific risk conditions prevailing in the river or estuary, is an intriguing and novel thought that complement current research stating migration as strongly governed by the cognitive ability and personality of fish1128.…”

Section: Discussionmentioning

confidence: 88%

GABAergic anxiolytic drug in water increases migration behaviour in salmon

et al. 2016

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Migration is an important life-history event in a wide range of taxa, yet many migrations are influenced by anthropogenic change. Although migration dynamics are extensively studied, the potential effects of environmental contaminants on migratory physiology are poorly understood. In this study we show that an anxiolytic drug in water can promote downward migratory behaviour of Atlantic salmon (Salmo salar) in both laboratory setting and in a natural river tributary. Exposing salmon smolt to a dilute concentration of a GABAA receptor agonist (oxazepam) increased migration intensity compared with untreated smolt. These results implicate that salmon migration may be affected by human-induced changes in water chemical properties, such as acidification and pharmaceutical residues in wastewater effluent, via alterations in the GABAA receptor function.

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Section: Discussionmentioning

confidence: 88%

GABAergic anxiolytic drug in water increases migration behaviour in salmon

et al. 2016

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“…In birds and mammals, the size of the hippocampus is associated with residence in structurally complex habitats and food caching (Sherry, 1998). Strictly limnetic British Columbian populations of G. aculeatus are less likely to use spatial cues than benthics to forage (Odling‐Smee & Braithwaite, 2003a; Odling‐Smee et al , 2008). Alaskan generalist populations are not as specialized for planktivory as limnetic populations in British Columbia (J. Baker & S. Foster pers.…”

Section: Discussionmentioning

confidence: 99%

Variation of telencephalon morphology of the threespine stickleback (Gasterosteus aculeatus) in relation to inferred ecology

Park

Bell

2010

J of Evolutionary Biology

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We tested the hypothesis that increased telencephalon size has evolved in threespine stickleback fish (Gasterosteus aculeatus) from structurally complex habitats using field‐caught samples from one sea‐run (ancestral) and 18 ecologically diverse freshwater (descendant) populations. Freshwater habitats ranged from shallow, structurally complex lakes with benthic‐foraging stickleback (benthics), to deeper, structurally simple lakes in which stickleback depend more heavily on plankton for prey (generalists). Contrary to our expectations, benthics had smaller telencephala than generalists, but the shape of the telencephalon of the sea‐run and benthic populations were more convex laterally. Convex telencephalon shape may indicate enlargement of the dorsolateral region, which is homologous with the tetrapod hippocampus. Telencephalon morphology is also sexually dimorphic, with larger, less convex telencephala in males. Freshwater stickleback from structurally complex habitats have retained the ancestral telencephalon morphology, but populations that feed more in open habitats on plankton have evolved larger, laterally concave telencephala.

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“…Observations of other salmonid species indicate that juvenile salmonids also use olfactory information to help them locate their home areas in streams. Fish may rely on a combination of several cues, such as landmarks, water temperature, light levels, or vegetation, in addition to odours (Odling-Smee & Braithwaite 2003). Furthermore, Halvorsen & Stabell (1990) found that fewer brown trout with experimentally removed olfactory organs returned to their home ranges within a stream than did sham-operated control fish.…”

Section: Sampling Stationmentioning

confidence: 99%