期刊
BRAIN BEHAVIOR AND EVOLUTION
卷 81, 期 2, 页码 86-92出版社
KARGER
DOI: 10.1159/000345945
关键词
Brain size; Allometry; Isometry; Miniaturization; Trichogramma evanescens
资金
- NWO/ALW [820.01.012]
- PERC [31.840.10154]
Throughout the animal kingdom, Hailer's rule holds that smaller individuals have larger brains relative to their body than larger-bodied individuals. Such brain-body size allometry is documented for all animals studied to date, ranging from small ants to the largest mammals. However, through experimental induction of natural variation in body size, and 3-D reconstruction of brain and body volume, we here show an isometric brain-body size relationship in adults of one of the smallest insect species on Earth, the parasitic wasp Trichogramma evanescens. The relative brain volume constitutes on average 8.2% of the total body volume. Brain-body size isometry may be typical for the smallest species with a rich behavioural and cognitive repertoire: a further increase in expensive brain tissue relative to body size would be too costly in terms of energy expenditure. This novel brain scaling strategy suggests a hitherto unknown flexibility in neuronal architecture and brain modularity. Copyright (C) 2013 S. Karger AG, Basel
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