Low-latitude zooplankton pigmentation plasticity in response to multiple threats

Research output: Contribution to journalArticle

Abstract

Crustacean copepods in high-latitude lakes frequently alter their pigmentation facultatively to defend themselves against prevailing threats, such as solar ultraviolet radiation (UVR) and visually oriented predators. Strong seasonality in those environments promotes phenotypic plasticity. To date, no one has investigated whether low-latitude copepods, experiencing continuous stress from UVR and predation threats, exhibit similar inducible defences. We here investigated the pigmentation levels of Bahamian 'blue hole' copepods, addressing this deficit. Examining several populations varying in predation risk, we found the lowest levels of pigmentation in the population experiencing the highest predation pressure. In a laboratory experiment, we found that, in contrast with our predictions, copepods from these relatively constant environments did show some changes in pigmentation subsequent to the removal of UVR; however, exposure to water from different predation regimes induced minor and idiosyncratic pigmentation change. Our findings suggest that low-latitude zooplankton in inland environments may exhibit reduced, but non-zero, levels of phenotypic plasticity compared with their high-latitude counterparts.

Details

Authors
Organisations
External organisations
  • Institute of Hydrobiology, Chinese Academy of Sciences
  • North Carolina State University
  • Karlstad University
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Ecology

Keywords

  • Calanoida, Colorimetric method, Cyclopoida, Freshwater, Predation, Ultraviolet radiation
Original languageEnglish
Article number190321
JournalRoyal Society Open Science
Volume6
Issue number7
Publication statusPublished - 2019 Jul 1
Publication categoryResearch
Peer-reviewedYes