, Volume 709, Issue 1, pp 27–39 | Cite as

Does the fish presence influence the diurnal vertical distribution of zooplankton in high transparency lakes?

  • Rocco Tiberti
  • Rocco Iacobuzio
Primary Research Paper


The avoidance of visually feeding fish has long been considered as the primary driver of diel vertical migration of zooplankton. The diurnal vertical distribution of Cyclops gr. abyssorum, Arctodiaptomus alpinus, and Daphnia gr. longispina from 13 alpine lakes with fish (Salvelinus fontinalis) and without, was compared in order to understand whether fish in transparent lakes reduce the presence of large zooplankton from the irradiated zone. We used the light level at each sampling depth and the size of each specimen as proxies of predation risk, and we tested two predictions: (P1) the relative abundance of zooplankton in the well-lit surface waters vs. the darker waters will be greater in fishless lakes; (P2) the size of zooplankton in the well-lit surface waters vs. the deeper, darker waters will be greater in fishless lakes. We did not find any evidence of the validity of P1, but we confirmed P2 for Arctodiaptomus alpinus. These results support with new field data the Transparency Regulator Hypothesis, which argues that in transparent lakes, fish predation is less important for the vertical distribution of zooplankton than ultraviolet radiation, and further suggest that zooplankton size rather than vertical distribution may be more effective against visual predators in transparent lakes.


Alpine lakes Introduced fish Gran Paradiso National Park Transparency Regulator Hypothesis Vertical Migration 



We thank Achaz von Hardenberg, Bruno Bassano (Gran Paradiso National Park), and Giuseppe Bogliani (University of Pavia) for their support and contributions to the research program. We thank Cristiana Callieri and Roberto Bertone (ISE-CNR) for lending us the light meter, and Andrew Sturgeon for his kind revision of the manuscript. Logistic support and funding for this research was provided by the Gran Paradiso National Park within the framework of the FP7 ACQWA Project (Assessment of Climatic change and impacts on the Quantity and quality of Water), Grant Agreement No. 212250.


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Copyright information

© Springer Science+Business Media Dordrecht 2012

Authors and Affiliations

  1. 1.DSTA, Dipartimento di Scienze della Terra e dell’AmbienteUniversity of PaviaPaviaItaly
  2. 2.Alpine Wildlife Research CentreValsavarencheItaly

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