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Handedness and individual roll-angle specialism when plunge diving in the northern gannet. | LitMetric

Handedness and individual roll-angle specialism when plunge diving in the northern gannet.

Biol Lett

School of Biological, Earth and Environmental Sciences (BEES), University College Cork, Cork T23 N73K, Ireland.

Published: September 2023

AI Article Synopsis

  • Many vertebrates exhibit lateralized behavior, or handedness, which is linked to brain lateralization and influences functions like movement and decision-making.
  • A study on 51 northern gannets found that during plunge dives, 51% of the birds preferred rolling to the left, while 43% favored the right, with 6% showing no preference.
  • The research demonstrated that individual gannets consistently preferred their dive roll direction and angle over time, marking the first evidence of lateralization during prey capture in seabirds and providing a framework for future studies on behavioral lateralization.

Article Abstract

Many vertebrates show lateralized behaviour, or handedness, where an individual preferentially uses one side of the body more than the other. This is generally thought to be caused by brain lateralization and allows functional specializations such as sight, locomotion, and decision-making among other things. We deployed accelerometers on 51 northern gannets, , to test for behavioural lateralization during plunge dives. When plunge diving, gannets 'roll' to one side, and standard indices indicated that 51% of individuals were left-sided, 43% right-sided, and 6% 'non-lateralized'. Lateralization indices provide no measure of error and do not account for environmental covariance, so we conducted two repeatability analyses on individuals' dive roll direction and angle. Dive side lateralization was highly repeatable among individuals over time at the population level ( = 0.878, < 0.001). Furthermore, roll angle was also highly repeatable in individuals ( = 0.751, < 0.001) even after controlling for lateralized state. Gannets show individual specializations in two different parts of the plunge diving process when attempting to catch prey. This is the first demonstration of lateralization during prey capture in a foraging seabird. It is also one of the few demonstrations of behavioural lateralization in a mixed model approach, providing a structure for further exploring behavioural lateralization.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10480694PMC
http://dx.doi.org/10.1098/rsbl.2023.0287DOI Listing

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