Constant illumination reduces circulating melatonin and impairs immune function in the cricket Teleogryllus commodus.

摘要: Exposure to constant light has a range of negative effects on behaviour and physiology, including reduced immune function in both vertebrates invertebrates. It is proposed that the associated suppression melatonin (a ubiquitous hormone powerful antioxidant) response presence at night could be an underlying mechanistic link driving changes function. Here, we investigated relationship between illumination, function, using model invertebrate species, Australian black field cricket, Teleogryllus commodus. Crickets were reared under either 12 h light: dark regimen or 24 regimen. Circulating concentration (haemocyte concentration, lytic activity phenoloxidase (PO) activity) assessed individual adult crickets through analysis haemolymph. Constant illumination had impact haemocyte concentrations activity, but its effect PO was less apparent. Our data provide first evidence, our knowledge, exposure variation model, while also highlighting potential complexity following illumination. This study provides insight into possible artificial night-time lighting physiology invertebrates, whether lower potentially more ecologically relevant levels produce comparable results, as been reported several vertebrate taxa, remains tested.