Effect of UV radiation on habitat selection by Girella laevifrons and Graus nigra (Kyphosidae)

Abstract

The effect of UV radiation on habitat use of two species of intertidal fishes that inhabit the same pools but exhibit different activity levels and diets was measured: the highly active omnivorous Girella laevifrons and the cryptic carnivorous Graus nigra. Individuals of each species were acclimated to a tank divided in three sections with different illumination; no light (NL), ultraviolet light (UV) and white light (WL), and the time spent and number of visits to each section were recorded. Although both species preferred the NL section, G. laevifrons spent more time in UV and less time in WL compared with G. nigra; G. laevifrons also displayed higher number of visits to UV, suggesting a different tendency in space use in response to UV exposure in intertidal fishes.

Adverse Effects of Ultraviolet Radiation on Growth, Behavior, Skin Condition, Physiology, and Immune Function in Gilthead Seabream (Sparus aurata)

“…The present study also showed that seabream juveniles tried to avoid UVB exposure, especially during the afternoon period (8-16 days -UVB-H, 26-40 days -UVB-M). Previous studies have shown that fish generally adopt a UVB avoidance strategy to escape radiation exposure (Kelly and Bothwell, 2002;Sucré et al, 2012;Pulgar et al, 2015;Vargas et al, 2018). The UVB avoidance strategy can be triggered by the early perception of skin damage, or due to UVB detection in the eyes by UVsensitive retinal photoreceptors, as suggested by Alemanni et al (2003) and Sharma et al (2007).…”

“…Moreover, the severe lesions (e.g., desquamation, necrosis, sloughing of the skin) observed in juveniles in this study corroborate our hypothesis that seabream is susceptible to standard underwater UVB levels from the Red Sea, and also from the Mediterranean, especially during the summer months. As mentioned in the section above, fish also avoid UVB exposure as a strategy to cope with overexposure (Fukunishi et al, 2006;Pulgar et al, 2015;Valiñas and Walter Helbling, 2016). However, when confined, such as occurs with S. aurata in aquaculture cages, fish cannot avoid UVB exposure by moving to lower depths or by sheltering.…”

“…A limited number of studies have reported changes in behavior due to UVB exposure. Restless behavior, an increase or decrease in swimming activity, a reduction of predatory performance, and preference for habitat selection are some of the reported behavioral changes observed in UVBexposed fish (Alemanni et al, 2003;Pulgar et al, 2015;Seebacher et al, 2016;Valiñas and Walter Helbling, 2016).…”

Efecto del endoparásito Prosorhynchoides sp. (Trematoda: Bucephalidae) en la capacidad de nado sostenido del baunco Girella laevifrons (Osteichthyes: Kyphosidae)

“…Promedio ± desviación estándar de las variables biológicas medidas en juveniles de baunco Girella laevifrons / Mean values ± standard deviation of biological variables measured in juvenile fish of Girella laevifrons Los resultados de estos experimentos sugieren que los parásitos tienen un efecto negativo en la capacidad de nado de G. laevifrons, debido a que el tiempo de nado sostenido fue significativamente menor en PP que en PNP. G. laevifrons es capaz de resistir distintos estresores, tales como factores ambientales, antrópicos y/o ecológicos (Carrasco-Malio et al 2014, Pulgar et al 2014, por lo tanto la manipulación adicional en los PP, al momento de infectarlos con cercarias, podría tener poco efecto en la capacidad de nado, y no invalidaría la comparación entre ambos grupos de peces (PP y PNP). Además, el tiempo de nado no se correlacionó con la abundancia de parásitos; peces que tenían pocas metacercarias (abundancia mínima encontrada= 9) mostraron similar tiempo de nado que aquellos que tenían muchas metacercarias (más de 200).…”

The relationship between UV-irradiance, photoprotective compounds and DNA damage in two intertidal invertebrates with contrasting mobility characteristics

“…sessile versus mobile) and either the presence or absence of a physical covering, offering protection to soft tissues of the body against UV-R [40,84,85]. For example, some planktonic organisms display negative photo-taxis, resulting in vertical migrations during high irradiance periods from surface to deeper waters, and vice versa, during the night [43,44].…”