Toward a more comprehensive theory of zooplankton diel vertical migration: Integrating ultraviolet radiation and water transparency into the biotic paradigm

• DOI: 10.4319/lo.2011.56.5.1603
• Publication Date: 2011-07-22T19:27:49Z
• Authors: Craig E. Williamson; Janet M. Fischer; Stephen M. Bollens; Erin P. Overholt; Joanne K. Brecken...
• Keywords: Biotic component; Diel vertical migration

The current prevailing theory of diel vertical migration (DVM) zooplankton is focused largely on two biotic drivers: food and predation. Yet recent evidence suggests that abiotic drivers such as damaging ultraviolet (UV) radiation temperature are also important. Here we integrate knowledge the effects factors DVM with biologically based paradigm to develop a more comprehensive framework for understanding in zooplankton. We focus “normal” (down during day, up at night) holoplanktonic, primarily herbivorous This new transparency‐regulator hypothesis differentiates between structural , food, vary little over 24‐h period dynamic UV visual predation, show strong variation period. emphasizes central role water transparency regulating these major DVM. In less transparent systems, often optimal surface waters, predators abundant, levels low. contrast, thermal gradients tend be gradual, quality quantity higher deeper predator abundance lower waters. provides versatile theoretical explain across waters differing transparency. enables clearer predictions how wide range ongoing transparency‐altering local, regional, global environmental changes can expected influence patterns both inland oceanic world.