Details

Autor(en) / Beteiligte

• Oshima, Megumi
• di Pauli von Treuheim, Theodor
• Carroll, Julia
• Hanlon, Roger T.
• Walters, Edgar T.
• Crook, Robyn J.

Titel

Peripheral injury alters schooling behavior in squid, Doryteuthis pealeii

Ist Teil von

• Behavioural processes, 2016-07, Vol.128, p.89-95

Ort / Verlag

Netherlands: Elsevier B.V

Erscheinungsjahr

2016

Link zum Volltext

Quelle

MEDLINE

Beschreibungen/Notizen

• •Squid with acute injuries are more likely to school with conspecifics.•Squid injured 6–24 hours earlier were more likely to school when a predator cue was present.•Position within school groups was affected by the time since injury and the type of potential predatory threat.•No evidence that squid orient visible wounds away from perceived threats. Animals with detectable injuries are at escalated threat of predation. The anti-predation tactic of schooling reduces individual predation risk overall, but it is not known how schooling behavior affects injured animals, or whether risks are reduced equally for injured animals versus other school members. In this laboratory study we examined the effects of minor fin injury on schooling decisions made by squid. Schooling behavior of groups of squid, in which one member was injured, was monitored over 24h. Injured squid were more likely to be members of a school shortly after injury (0.5–2h), but there were no differences compared with sham-injured squid at longer time points (6–24h). Overall, the presence of an injured conspecific increased the probability that a school would form, irrespective of whether the injured squid was a member of the school. When groups containing one injured squid were exposed to a predator cue, injured squid were more likely to join the school, but their position depended on whether the threat was a proximate visual cue or olfactory cue. We found no evidence that injured squid oriented themselves to conceal their injury from salient threats. Overall we conclude that nociceptive sensitization after injury changes grouping behaviors in ways that are likely to be adaptive.