UV-B-tolerance of alpine and arctic Daphnia

Zellmer, Iris D.

doi:10.1007/bf00032007

Cited by 35 publications

(15 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Our results suggested some variability in susceptibility between pigmented populations, but failed to show any strong effect of post-irradiation light repair, in contrast to the findings of Siebeck & Bohm (1994). The laboratory experiments demonstrated the lower UV-B susceptibility of melanized Daphnia, supporting the findings of Hebert & Emery (1990), Zellmer (1995) and Hessen (1996), and the prediction that heavily melanized individuals in the shallowest locality are most tolerant to UV (Fig. 3).…”

Section: Discussionsupporting

confidence: 86%

See 1 more Smart Citation

UV-B susceptibility and photoprotection of Arctic Daphnia morphotypes

et al. 1999

View full text Add to dashboard Cite

UV-B tolerance and susceptibility of high Arctic morphotypes of tte Daphnia pulexl D. tenebrosa complex were assessed by in situ experiments at Ny-Alesund, Svalbard (79"N). Animals from local ponds were exposed to ambient light plus additional UV-B from lamps in a greenhouse facility. Taxonomic affinities did not appear as major determinants of UV susceptibility, but a major difference in UV-B tolerance was seen between morphotypes with pigmented carapaces and those without, the latter being far more susceptible. Assays on levels of carotene and the anti-oxidant enzymes catalase and superoxide dismutase did not reveal clear-cut differences between populations, and could not account for the higher tolerance in pigmented populations. Levels of glutathione transferase were higher in the transparent population, however. In the absence of blue light and UV, laboratory reared animals did not reconstitute their carapace melanization after moulting, indicating that short-wave light is the cue for melanin synthesis. Tests on melanized individuals and individuals of the same population reared indoors through 1-2 moults supported the major role of melanin for UV protection. Periods with high UV exposure during hatching of ephippia could induce shifts in morphotype or clonal dominance.

show abstract

Section: Discussionsupporting

confidence: 86%

“…comprise a species complex with astonishing clonal complexity and genetic variability (Weider, Beaton et al 1987;Hobzk & Wolf 1991;Colboume et al 1998). Most remarkable is the co-existence of morphotypes with and without carapace melanization (Hebert & Emery 1990;Zellmer 1995;Hessen 1996). Highly light-exposed Daphnia populations Table 1.…”

Section: Introductionmentioning

confidence: 99%

UV-B susceptibility and photoprotection of Arctic Daphnia morphotypes

et al. 1999

View full text Add to dashboard Cite

show abstract

“…1). This could be due to the more severe UVR effects on dividing cells in the offspring (Zellmer 1995) or a generally more explorative behavior of older individuals. The refuge demand, that is, the overall escape behavior, was highly repeatable within individuals when analyzing mothers and daughters together (Table 1), suggesting individual consistency, that is, that some individuals are more risk taking than others over consecutive exposures.…”

Section: Discussionmentioning

confidence: 99%

Context‐dependent individual behavioral consistency in Daphnia

et al. 2017

View full text Add to dashboard Cite

The understanding of consistent individual differences in behavior, often termed "personality,"for adapting and coping with threats and novel environmental conditions has advanced considerably during the last decade. However, advancements are almost exclusively associated with higher-order animals, whereas studies focusing on smaller aquatic organisms are still rare. Here, we show individual differences in the swimming behavior of Daphnia magna, a clonal freshwater invertebrate, before, during, and after being exposed to a lethal threat, ultraviolet radiation (UVR). We show consistency in swimming velocity among both mothers and daughters of D. magna in a neutral environment, whereas this pattern breaks down when exposed to UVR. Our study also, for the first time, illustrates how the ontogenetic development in swimming and refuge-seeking behavior of young individuals eventually approaches that of adults. Overall, we show that aquatic invertebrates are far from being identical robots, but instead they show considerable individual differences in behavior that can be attributed to both ontogenetic development and individual consistency. Our study also demonstrates, for the first time, that behavioral consistency and repeatability, that is, something resembling "personality," is context and state dependent in this zooplankter taxa.

show abstract

“…wavelengths >295 nm) the potential DNA damage increases exponentially with decreasing wavelength. Many studies have shown reduced survival in different zooplankton species after UVR exposure (19)(20)(21). However, the response to UVR shows enormous variability among species (20,(22)(23)(24)(25)(26), life stages (21,27), pigmented morphs (compared with nonpigmented morphs) (28) and even within single species (24,29,30).…”

Section: Uvr Effects On Zooplankton and Counteracting Strategiesmentioning

confidence: 99%

UV Radiation as a Potential Driving Force for Zooplankton Community Structure in Patagonian Lakes

Marinone

Marque

Suárez

et al. 2006

Photochem & Photobiology

View full text Add to dashboard Cite

This article explores the potential role of UV radiation (UVR) as an influence on zooplankton communities. In the first section we provide a general overview of UVR effects on freshwater zooplankton, with an emphasis on Argentine and Chilean environments. In the second section we present the results of a survey involving 53 temperate lakes across a gradient of UVR exposure to determine patterns of species richness and specific diversity. These community characteristics decreased at high potential UVR exposure (i.e. high mean water column irradiance or low lake optical density). A threshold value of mean water column irradiance of approximately 10% of the surface level seems to limit both richness and diversity to minimum values. On the basis of the collected evidence it is not possible to definitely conclude that UVR rather than another covarying factor is responsible for the decrease in specific diversity observed at the lowest end of lake optical depth. However, lakes with values above the previous threshold are likely to exhibit highly depauperate zooplankton communities regardless of the mechanism. As a cautionary note we suggest that changes in the optical characteristics (i.e. changes due to atmospheric conditions, precipitation patterns or vertical displacement of the tree line) may result in sudden shifts in zooplankton community structure.

show abstract

UV-B-tolerance of alpine and arctic Daphnia

Cited by 35 publications

References 9 publications

UV-B susceptibility and photoprotection of Arctic Daphnia morphotypes

UV-B susceptibility and photoprotection of Arctic Daphnia morphotypes

Context‐dependent individual behavioral consistency in Daphnia

UV Radiation as a Potential Driving Force for Zooplankton Community Structure in Patagonian Lakes

Contact Info

Product

Resources

About