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Local adaptation to UV radiation in zooplankton : a behavioral and physiological approach

Fernández, Carla E. LU ; Campero, Melina ; Bianco, Giuseppe LU ; Ekvall, Mikael T. LU ; Rejas, Danny ; Uvo, Cintia B. LU and Hansson, Lars Anders LU (2020) In Ecosphere 11(4).
Abstract

Ultraviolet radiation (UVR) is recognized as a driving force for phenotypic divergence. Here, we aim at assessing the ability of zooplankton to induce UVR tolerance and disentangle the relative importance of local adaptations behind the expression of such tolerance. Two populations of Daphnia pulex, derived from environments strongly differing in UVR conditions, were exposed to UVR for 70 d to induce production of photo-protective compounds and changes in behavioral responses. We expected greater tolerance to UVR in individuals from the high-UVR (H-U) environment as well as a refuge demand inversely related to the level of pigmentation. However, the complementarity between physiological and behavioral strategies was only observed on... (More)

Ultraviolet radiation (UVR) is recognized as a driving force for phenotypic divergence. Here, we aim at assessing the ability of zooplankton to induce UVR tolerance and disentangle the relative importance of local adaptations behind the expression of such tolerance. Two populations of Daphnia pulex, derived from environments strongly differing in UVR conditions, were exposed to UVR for 70 d to induce production of photo-protective compounds and changes in behavioral responses. We expected greater tolerance to UVR in individuals from the high-UVR (H-U) environment as well as a refuge demand inversely related to the level of pigmentation. However, the complementarity between physiological and behavioral strategies was only observed on animals from the Low-UVR environment (L-U). L-U animals developed photo-protective compounds and decreased their refuge demand when re-exposed to UVR, that is, tolerated more UVR, compared to their control siblings. Conversely, UVR-exposed individuals from the H-U environment even having developed higher levels of photo-protective compounds increased their refuge demand staying deeper in the water column compared to the control animals, likely expressing an evolutionary memory to seek refuge in deeper waters irrespective of the UVR level. Stronger changes were observed in the H-U population compared to the L-U population; thus, our results suggest that although changes in tolerance after UVR exposure were evident for both populations, the strength of the inductions was more related to local adaptation independently of the rearing environment, showing that UVR tolerance is dependent on the evolutionary history of each population.

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author
; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Daphnia, evolutionary memory, local adaptation, photo-protection, ultraviolet radiation, vertical migration
in
Ecosphere
volume
11
issue
4
article number
e03081
publisher
Ecological Society of America
external identifiers
  • scopus:85084448855
ISSN
2150-8925
DOI
10.1002/ecs2.3081
language
English
LU publication?
yes
id
2fa251b0-3d8d-41c0-966c-fc8586257517
date added to LUP
2020-05-22 11:29:10
date last changed
2021-04-16 14:04:31
@article{2fa251b0-3d8d-41c0-966c-fc8586257517,
  abstract     = {<p>Ultraviolet radiation (UVR) is recognized as a driving force for phenotypic divergence. Here, we aim at assessing the ability of zooplankton to induce UVR tolerance and disentangle the relative importance of local adaptations behind the expression of such tolerance. Two populations of Daphnia pulex, derived from environments strongly differing in UVR conditions, were exposed to UVR for 70 d to induce production of photo-protective compounds and changes in behavioral responses. We expected greater tolerance to UVR in individuals from the high-UVR (H-U) environment as well as a refuge demand inversely related to the level of pigmentation. However, the complementarity between physiological and behavioral strategies was only observed on animals from the Low-UVR environment (L-U). L-U animals developed photo-protective compounds and decreased their refuge demand when re-exposed to UVR, that is, tolerated more UVR, compared to their control siblings. Conversely, UVR-exposed individuals from the H-U environment even having developed higher levels of photo-protective compounds increased their refuge demand staying deeper in the water column compared to the control animals, likely expressing an evolutionary memory to seek refuge in deeper waters irrespective of the UVR level. Stronger changes were observed in the H-U population compared to the L-U population; thus, our results suggest that although changes in tolerance after UVR exposure were evident for both populations, the strength of the inductions was more related to local adaptation independently of the rearing environment, showing that UVR tolerance is dependent on the evolutionary history of each population.</p>},
  author       = {Fernández, Carla E. and Campero, Melina and Bianco, Giuseppe and Ekvall, Mikael T. and Rejas, Danny and Uvo, Cintia B. and Hansson, Lars Anders},
  issn         = {2150-8925},
  language     = {eng},
  month        = {04},
  number       = {4},
  publisher    = {Ecological Society of America},
  series       = {Ecosphere},
  title        = {Local adaptation to UV radiation in zooplankton : a behavioral and physiological approach},
  url          = {http://dx.doi.org/10.1002/ecs2.3081},
  doi          = {10.1002/ecs2.3081},
  volume       = {11},
  year         = {2020},
}