Abstract
Animals use cues from a range of sensory modalities to discriminate stimuli and as predictors of reward. Whilst there is appreciable variation in the cognitive performance of animals, we know surprisingly little about the extent to which learning varies among individuals across different sensory modalities. Do individuals that are good at learning in one sensory modality also perform well in another (performance is correlated between modalities), or do individuals demonstrate specialisation in learning performance in one modality (trading-off performance between modalities)? We tested these hypotheses by examining the performance of 76 Bombus terrestris workers, from four colonies, in both an odour-and visual learning task. Olfactory learning was assessed using proboscis extension reflex (PER) conditioning and visual (colour) learning was examined using a well-established free-flying paradigm. Our results showed neither a correlation, nor a trade-off, in individual performance for learning tasks using different sensory modalities. However, there was considerable variation among workers within each colony in their performance in both learning tasks. This extent of interindividual variation in learning ability across sensory modalities could be adaptive for colonies dealing with changeable foraging conditions. There was also significant intercolony variation in final task performance level in the olfactory learning task, and both the strength and persistence of blue preference in the colour learning task. This is the first study to demonstrate variation in olfactory learning performance across multiple bumblebee colonies using PER conditioning, suggesting this is an effective paradigm for assessing associative olfactory learning performance both within and among colonies.
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Acknowledgments
We thank Mark Brown, Gemma Baron, Lisa Evans and Dara Stanley for the comments and Oscar Ramos-Rodriguez for the technical assistance, Syngenta Bioline Bees for supplying the colonies and Andre Riveros for the helpful advice about PER with bumblebees. KES was supported by a Crosslands Research Scholarship and the Atkins bequest from Royal Holloway University of London.
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KES carried-out the experiment and statistical analyses, KES & NER conceived the project, designed the experiment and wrote the paper.
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Communicated by M. Giurfa
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Smith, K.E., Raine, N.E. A comparison of visual and olfactory learning performance in the bumblebee Bombus terrestris . Behav Ecol Sociobiol 68, 1549–1559 (2014). https://doi.org/10.1007/s00265-014-1765-0
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DOI: https://doi.org/10.1007/s00265-014-1765-0