Relative telencephalon size does not affect collective motion in the guppy (Poecilia reticulata)

• Collective motion is common across all animal taxa, from swarming insects to schools of fish. The collective motion requires intricate behavioral integration among individuals, yet little is known about how evolutionary changes in brain morphology influence the ability for individuals to coordinate behavior in groups. In this study, we utilized guppies that were selectively bred for relative telencephalon size, an aspect of brain morphology that is normally associated with advanced cognitive functions, to examine its role in collective motion using an open-field assay. We analyzed high-resolution tracking data of same-sex shoals consisting of 8 individuals to assess different aspects of collective motion, such as alignment, attraction to nearby shoal members, and swimming speed. Our findings indicate that variation in collective motion in guppy shoals might not be strongly affected by variation in relative telencephalon size. Our study suggests that group dynamics in collectively moving animals are likely not driven by advanced cognitive functions but rather by fundamental cognitive processes stemming from relatively simple rules among neighboring individuals. Collective motion occurs when animals coordinate their movement in schools, flocks, or herds. Using an experimental approach, we show that the size of the cognitive center in the vertebrate brain, the telencephalon, does not influence the ability to coordinate movement in single-sex guppy shoals artificially selected to have large or small telencephalon size. Advanced cognitive functions are likely not used during coordination of movements in guppy shoals.

Ämnesord

NATURVETENSKAP  -- Biologi -- Zoologi (hsv//swe)

NATURAL SCIENCES  -- Biological Sciences -- Zoology (hsv//eng)

Nyckelord

collective motion

guppy

telencephalon

Publikations- och innehållstyp

ref (ämneskategori)

art (ämneskategori)