The impact of food quantity on UV-B tolerance and recovery from UV-B damage in Daphnia pulex

Zellmer, Iris D.

doi:10.1007/bf00016876

Cited by 22 publications

(20 citation statements)

References 10 publications

(9 reference statements)

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“…Considering these arguments, we suggest that UVR avoidance by vertical displacement may be more efficiently achieved in deep, stratified lakes than in shallow, continuously mixed ones. Of course, such a conclusion remains to be tested, and we acknowledge the fact that other factors, such as a better nutritional status, may contribute to UVR tolerance (Zellmer 1996).…”

Section: Physiological and Behavioral Responses To Par And Uvr-mentioning

confidence: 97%

Surface avoidance by freshwater zooplankton: Field evidence on the role of ultraviolet radiation

Alonso

Rocco

Barriga

et al. 2004

Limnology & Oceanography

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The avoidance of surface waters by crustacean zooplankton is a common phenomenon both in marine and freshwaters. The contemporary paradigm interprets such behavior as an antipredator strategy. However, the phenomenon has also been reported in predator-free environments, which suggests that other variables may contribute to this depth-selection behavior. We investigated the possibility that ultraviolet radiation (UVR) could influence the avoidance of surface waters in three interconnected lakes differing in their transparency. Each lake was sampled 17 or 18 times. In the two most transparent lakes, the percentage of the population occurring in the surface layer decreased during spring and summer, but this pattern was not observed in the less transparent lake. Such differences in the patterns of surface-water avoidance were unrelated to the abundance and vertical distribution of the dominant planktivores (early stages of galaxiid fishes) as well as to temperature and food availability. They were inversely related, however, to the average UVR levels within the surface layer. A UV avoidance strategy was predicted for the copepod Boeckella gracilipes, on account of its low UV tolerance and lack of photoprotective compounds. Our results support this prediction and strongly suggest that surface avoidance by freshwater Patagonian zooplankton is not just a byproduct benefit of an antipredator behavior but is a direct response to high UVR levels.

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Section: Physiological and Behavioral Responses To Par And Uvr-mentioning

confidence: 97%

Surface avoidance by freshwater zooplankton: Field evidence on the role of ultraviolet radiation

Alonso

Rocco

Barriga

et al. 2004

Limnology & Oceanography

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“…Therefore, herbivore consumers living in transparent lakes would be constrained by poor stoichiometric food quality and would also be exposed to a potentially hazardous UVR regime. Early studies on Daphnia pulex have suggested that better nutritional status may contribute to a greater UVR tolerance (Zellmer 1996). Andean lakes are characterized by the high transparency and high UVR penetration (Morris et al 1995).…”

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confidence: 99%

Living in transparent lakes: Low food P:C ratio decreases antioxidant response to ultraviolet radiation in Daphnia

Balseiro

Souza

Modenutti

et al. 2008

Limnology & Oceanography

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We experimentally tested the effect of food quality (phosphorus [P] : carbon [C] ratio) on the response of antioxidant enzymes to ultraviolet radiation (UVR) in Daphnia commutata fed with Chlamydomonas reinhardtii. Algal cultures were grown at different concentrations of phosphorus and light intensities, resulting in significant differences in the P : C ratios (mmol P?[mmol C] 21 ; 6.05, 1.70, and 0.83). After 12 d of D. commutata growth under these three food quality treatments, we observed significant differences in individual biomass and protein content of Daphnia. Subsequently, we carried out an ultraviolet exposure experiment to determine if stoichiometric constraints imposed would limit enzymatic defenses against UVR oxidative stress. The UVR-exposure experiment consisted of a factorial design with three levels of food P : C (low, medium, and high) and two levels of UVR (exposed and protected). The activities of glutathione S-transferases (GST) and catalase (CAT), enzymes involved in protection and repair of damage caused by UVR, were determined. Enzyme activities in the animals exposed to or protected from UVR showed a direct relationship with food P : C ratio that fit exponential models. Although GST and CAT differed slightly in their response to UVR, both enzymes were significantly affected by food quality: In low P : C treatments, there was significantly lower enzyme activity in response to UVR for both enzymes. Low food quality (less P for biosynthesis) may also impose a weaker antioxidant response on the organisms, a response of considerable ecological relevance in transparent Andean lakes which combine high UVR intensities with low seston P : C ratios.

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“…Our estimate of the relative lethal dose for D. magna was higher than that of Hurtubise et al (1998). This variation could be due to our different experimental set up or differences in food quality, which are known to influence UVB tolerance of cladocerans (Zellmer 1996). Also respiration rates (Fischer et al 2006) and temperature (Moresino, and Helbling 2010) can affect the lethal UVB dose.…”

Section: Discussionmentioning

confidence: 99%

Ostracod valves as efficient UV protection

et al. 2012

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The impact of food quantity on UV-B tolerance and recovery from UV-B damage in Daphnia pulex

Cited by 22 publications

References 10 publications

Surface avoidance by freshwater zooplankton: Field evidence on the role of ultraviolet radiation

Surface avoidance by freshwater zooplankton: Field evidence on the role of ultraviolet radiation

Living in transparent lakes: Low food P:C ratio decreases antioxidant response to ultraviolet radiation in Daphnia

Ostracod valves as efficient UV protection

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