Journal Article

The role of ultraviolet radiation in the diel vertical migration of zooplankton: an experimental test of the transparency-regulator hypothesis

Taylor H. Leach, Craig E. Williamson, Nora Theodore, Janet M. Fischer and Mark H. Olson

in Journal of Plankton Research

Volume 37, issue 5, pages 886-896
Published in print September 2015 | ISSN: 0142-7873
Published online August 2015 | e-ISSN: 1464-3774 | DOI: https://dx.doi.org/10.1093/plankt/fbv061
The role of ultraviolet radiation in the diel vertical migration of zooplankton: an experimental test of the transparency-regulator hypothesis

More Like This

Show all results sharing these subjects:

  • Marine and Estuarine Biology
  • Zoology and Animal Sciences

GO

Show Summary Details

Preview

Zooplankton diel vertical migration (DVM) is often explained as a balance between predator avoidance and resource acquisition. However, recent studies suggest that ultraviolet radiation (UV) may also be important in driving zooplankton DVM in some systems. Williamson et al. ( Williamson et al., 2011) proposed the “transparency-regulator hypothesis,” which integrates UV into our current understanding of the drivers of DVM and predicts that the relative roles of UV and visual predation pressure will vary systematically across a gradient of lake transparency. To assess this hypothesis, we conducted in situ mesocosm experiments in five different lakes: two lakes without fish and three lakes with fish that spanned a range of UV and visible light transparency. We used an open-bottomed mesocosm design that allowed for the direct manipulation of UV that did not constrain visual predators or the amplitude or timing of natural migrations. Consistent with the transparency-regulator hypothesis, we found that UV is an important driver of Daphnia DVM in highly UV transparent lakes with and without fish but not in low transparency systems. Our results also suggest that UV and visual predation pressure may interact in systems of intermediate transparency.

Keywords: ultraviolet radiation; diel vertical migration; zooplankton ecology

Journal Article.  6970 words.  Illustrated.

Subjects: Marine and Estuarine Biology ; Zoology and Animal Sciences

Full text: subscription required

How to subscribe Recommend to my Librarian

Users without a subscription are not able to see the full content. Please, subscribe or login to access all content.