Artificial Light at Night (ALAN) negatively affects the settlement success of two prominent intertidal barnacles in the southeast Pacific

May 6, 2021Marine pollution bulletin

Artificial Light at Night Reduces Settlement Success of Two Common Southeast Pacific Intertidal Barnacles

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Abstract

The density of late settlers (post-metamorphosis spats) was significantly lower in ALAN plates than in control plates for both barnacle species.

  • Day/night cycles are important for coastal processes and may be altered by Artificial Light at Night (ALAN).
  • Notochthamalus scabrosus and Jehlius cirratus were studied to assess the impact of ALAN on barnacle settlement rates.
  • Early settlers (pre-metamorphosis cyprids) showed no change in density under ALAN conditions.
  • ALAN exposure appears to negatively affect the settlement process of late settlers in both barnacle species.

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