Do Males Bite Females' Antennae to Coerce Copulation or to Continue Mate Guarding in Oiceoptoma subrufum (Coleoptera: Silphinae)?

Sumitomo, Hiroyuki; Shiraishi, Kyosuke; Hirota, Tadao

doi:10.2108/zs130255

Cited by 1 publication

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“…Statistical analyses of the behavioural experiments were carried out using a generalized linear mixed model (GLMM) with binomial errors using r 2.14.1 (see Sumitomo et al ., ). For the phototaxis preference of LD animals, the model used the individual ID as a random factor and exit as an independent variable.…”

Section: Methodsmentioning

confidence: 97%

Cyclic AMP‐regulated opposing and parallel effects of serotonin and dopamine on phototaxis in the Marmorkrebs (marbled crayfish)

Shiratori

Suzuki

Momohara

et al. 2017

Eur J of Neuroscience

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Phototactic behaviours are observed from prokaryotes to amphibians and are a basic form of orientation. We showed that the marbled crayfish displays phototaxis in which the behavioural response reversed from negative to positive depending on external light conditions. Animals reared in a 12-L/12-D light cycle showed negative phototaxis during daytime and positive phototaxis during night-time. Animals reared under constant light conditioning showed negative phototaxis during day- and night-time, while animals reared under constant dark conditioning showed positive phototaxis during day- and night-time. Injection of serotonin leads to a reversal of negative to positive phototaxis in both light/dark-reared and light/light-reared animals while injection of dopamine induced reversed negative phototaxis in dark/dark-reared animals. Four hours of dark adaptation were enough for light/dark-reared animals to reverse phototaxis from negative to positive. Injection of a serotonin 5HT receptor antagonist blocked the reverse phototaxis while serotonin 5HT receptor antagonists had no effects. Similarly, dark/dark-reared animals reversed to showing negative phototaxis after 4 h of light adaptation. Injection of a dopamine DA receptor antagonist blocked this reverse phototaxis, while dopamine DA receptor antagonists had no effects. Injection of a cAMP analogue into light/dark-reared animals blocked reverse phototaxis after dark adaptation, while adenylate cyclase inhibitor in dark/dark-reared animals blocked reverse phototaxis after light adaptation. These results strongly suggest that serotonin mediates positive phototaxis owing to decreased cAMP levels, while dopamine-mediated negative phototaxis occurs due to increased cAMP levels. Supporting this, the ratio of serotonin to dopamine in the brain was much higher in dark/dark-reared than light/dark-reared animals.

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Section: Methodsmentioning

confidence: 97%