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Disentangling population strategies of two cladocerans adapted to different ultraviolet regimes

Fernández, Carla Eloisa LU ; Campero, Melina; B Uvo, Cintia LU and Hansson, Lars-Anders LU (2018) In Ecology and Evolution
Abstract
Zooplankton have evolved several mechanisms to deal with environmental threats, such as ultraviolet radiation (UVR), and in order to identify strategies inherent to organisms exposed to different UVR environments, we here examine life-history traits of two lineages of Daphnia pulex. The lineages differed in the UVR dose they had received at their place of origin from extremely high UVR stress at high-altitude Bolivian lakes to low UVR stress near the sea level in temperate Sweden. Nine life-history variables of each lineage were analyzed in laboratory experiments in the presence and the absence of sub-lethal doses of UVR (UV-A band), and we identified trade-offs among variables through structural equation modeling (SEM). The UVR treatment... (More)
Zooplankton have evolved several mechanisms to deal with environmental threats, such as ultraviolet radiation (UVR), and in order to identify strategies inherent to organisms exposed to different UVR environments, we here examine life-history traits of two lineages of Daphnia pulex. The lineages differed in the UVR dose they had received at their place of origin from extremely high UVR stress at high-altitude Bolivian lakes to low UVR stress near the sea level in temperate Sweden. Nine life-history variables of each lineage were analyzed in laboratory experiments in the presence and the absence of sub-lethal doses of UVR (UV-A band), and we identified trade-offs among variables through structural equation modeling (SEM). The UVR treatment was detrimental to almost all life-history variables of both lineages; however, the Daphnia historically exposed to higher doses of UVR (HighUV) showed a higher overall fecundity than those historically exposed to lower doses of UVR (LowUV). The total offspring and ephippia production, as well as the number of clutches and number of offspring at
first reproduction, was directly affected by UVR in both lineages. Main differences between lineages involved indirect effects that affected offspring production as the age at first reproduction. We here show that organisms within the same species have developed different strategies as responses to UVR, although no increased physiological tolerance or plasticity was shown by the HighUV lineage. In addition to known tolerance strategies to UVR, including avoidance, prevention, or repairing of damages, we here propose a population strategy that includes early reproduction and high fertility, which we show compensated for the fitness loss imposed by UVR stress. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
epub
subject
keywords
Cladocera, Daphnia, Life-history traits, Stress, Structural equation modeling, Ultraviolet radiation
in
Ecology and Evolution
pages
11 pages
publisher
Wiley-Blackwell
external identifiers
  • scopus:85040726009
ISSN
2045-7758
DOI
language
English
LU publication?
yes
id
de26276e-2b2b-4361-8896-f61dd4677242
date added to LUP
2018-01-19 10:51:56
date last changed
2018-05-29 09:18:58
@article{de26276e-2b2b-4361-8896-f61dd4677242,
  abstract     = {Zooplankton have evolved several mechanisms to deal with environmental threats, such as ultraviolet radiation (UVR), and in order to identify strategies inherent to organisms exposed to different UVR environments, we here examine life-history traits of two lineages of Daphnia pulex. The lineages differed in the UVR dose they had received at their place of origin from extremely high UVR stress at high-altitude Bolivian lakes to low UVR stress near the sea level in temperate Sweden. Nine life-history variables of each lineage were analyzed in laboratory experiments in the presence and the absence of sub-lethal doses of UVR (UV-A band), and we identified trade-offs among variables through structural equation modeling (SEM). The UVR treatment was detrimental to almost all life-history variables of both lineages; however, the Daphnia historically exposed to higher doses of UVR (HighUV) showed a higher overall fecundity than those historically exposed to lower doses of UVR (LowUV). The total offspring and ephippia production, as well as the number of clutches and number of offspring at<br/>first reproduction, was directly affected by UVR in both lineages. Main differences between lineages involved indirect effects that affected offspring production as the age at first reproduction. We here show that organisms within the same species have developed different strategies as responses to UVR, although no increased physiological tolerance or plasticity was shown by the HighUV lineage. In addition to known tolerance strategies to UVR, including avoidance, prevention, or repairing of damages, we here propose a population strategy that includes early reproduction and high fertility, which we show compensated for the fitness loss imposed by UVR stress.},
  author       = {Fernández, Carla Eloisa and Campero, Melina and B Uvo, Cintia and Hansson, Lars-Anders},
  issn         = {2045-7758},
  keyword      = {Cladocera,Daphnia,Life-history traits,Stress,Structural equation modeling,Ultraviolet radiation},
  language     = {eng},
  month        = {01},
  pages        = {11},
  publisher    = {Wiley-Blackwell},
  series       = {Ecology and Evolution},
  title        = {Disentangling population strategies of two cladocerans adapted to different ultraviolet regimes},
  url          = {http://dx.doi.org/},
  year         = {2018},
}