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Behavioural responses to co-occurring threats of predation and ultraviolet radiation in Daphnia

Ekvall, Mikael T. LU ; Sha, Yongcui LU ; Palmér, Tobias LU ; Bianco, Giuseppe LU ; Bäckman, Johan LU ; Åström, Kalle LU and Hansson, Lars Anders LU (2020) In Freshwater Biology
Abstract

Organisms in the wild are faced with multiple threats and a common response is a change in behaviour. To disentangle responses to several threats, we exposed two differently sized species of the freshwater invertebrate Daphnia to solar ultraviolet radiation (UVR) and predation from either moving pelagic or benthic ambush predators. Using an advanced nanotechnology-based method, we tracked the three-dimensional movements of those mm-sized animals at the individual level. Each behavioural trial was performed both under conditions resembling night (no UVR) and day (UVR) and we examined patterns of the depth distribution and swimming speed by Daphnia across three treatments: no predator (control); bottom-dwelling damselfly (Calopteryx sp.);... (More)

Organisms in the wild are faced with multiple threats and a common response is a change in behaviour. To disentangle responses to several threats, we exposed two differently sized species of the freshwater invertebrate Daphnia to solar ultraviolet radiation (UVR) and predation from either moving pelagic or benthic ambush predators. Using an advanced nanotechnology-based method, we tracked the three-dimensional movements of those mm-sized animals at the individual level. Each behavioural trial was performed both under conditions resembling night (no UVR) and day (UVR) and we examined patterns of the depth distribution and swimming speed by Daphnia across three treatments: no predator (control); bottom-dwelling damselfly (Calopteryx sp.); and fish (stickleback, Pungitius pungitius) predators. We also quantified the actual predation rate by the two predators on the two Daphnia species, Daphnia manga and Daphnia pulex. We show that individual Daphnia are able to identify predators with different feeding habitats, rank multiple and simultaneously occurring risks and respond in accordance with the actual threat; complex responses that are generally associated with larger animals. In a broader context, our results highlight and quantify how a cocktail of everyday threats is perceived and handled by invertebrates, which advances our understanding of species distribution in space and time, and thereby of population dynamics and ecosystem function in natural ecosystems.

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author
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organization
publishing date
type
Contribution to journal
publication status
epub
subject
keywords
Daphnia magna, Daphnia pulex, multiple threats, risk assessment, zooplankton
in
Freshwater Biology
publisher
Wiley-Blackwell
external identifiers
  • scopus:85083798900
ISSN
0046-5070
DOI
10.1111/fwb.13516
language
English
LU publication?
yes
id
ccf73ad7-9584-4696-ab70-e7ffee2b2e37
date added to LUP
2020-05-27 15:15:55
date last changed
2020-05-28 01:58:17
@article{ccf73ad7-9584-4696-ab70-e7ffee2b2e37,
  abstract     = {<p>Organisms in the wild are faced with multiple threats and a common response is a change in behaviour. To disentangle responses to several threats, we exposed two differently sized species of the freshwater invertebrate Daphnia to solar ultraviolet radiation (UVR) and predation from either moving pelagic or benthic ambush predators. Using an advanced nanotechnology-based method, we tracked the three-dimensional movements of those mm-sized animals at the individual level. Each behavioural trial was performed both under conditions resembling night (no UVR) and day (UVR) and we examined patterns of the depth distribution and swimming speed by Daphnia across three treatments: no predator (control); bottom-dwelling damselfly (Calopteryx sp.); and fish (stickleback, Pungitius pungitius) predators. We also quantified the actual predation rate by the two predators on the two Daphnia species, Daphnia manga and Daphnia pulex. We show that individual Daphnia are able to identify predators with different feeding habitats, rank multiple and simultaneously occurring risks and respond in accordance with the actual threat; complex responses that are generally associated with larger animals. In a broader context, our results highlight and quantify how a cocktail of everyday threats is perceived and handled by invertebrates, which advances our understanding of species distribution in space and time, and thereby of population dynamics and ecosystem function in natural ecosystems.</p>},
  author       = {Ekvall, Mikael T. and Sha, Yongcui and Palmér, Tobias and Bianco, Giuseppe and Bäckman, Johan and Åström, Kalle and Hansson, Lars Anders},
  issn         = {0046-5070},
  language     = {eng},
  month        = {04},
  publisher    = {Wiley-Blackwell},
  series       = {Freshwater Biology},
  title        = {Behavioural responses to co-occurring threats of predation and ultraviolet radiation in Daphnia},
  url          = {http://dx.doi.org/10.1111/fwb.13516},
  doi          = {10.1111/fwb.13516},
  year         = {2020},
}