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Effects of the proximal factors on the diel vertical migration of zooplankton in a plateau meso-eutrophic Lake Erhai, China

Cuilin Hu, Shengrui Wang, Longgen Guo, Ping Xie
  • Cuilin Hu
    Huagzhong Agriculture University, China
  • Shengrui Wang
    Chinese Research Academy of Environment Sciences, China
  • Longgen Guo
    Chinese Academy of Sciences, China

Abstract

To study the proximal factors inducing diel vertical migration (DVM) in large and small zooplankton species in a plateau lake in China, we investigated the DVM of crustacean zooplankton in lake Erhai bimonthly from November 2009 to September 2010. We hypothesized that the factors affecting DVM behaviour in different-sized zooplankton were different. A linear regression was used to assess the relationships between environmental variables and the vertical distribution of zooplankton. All crustacean zooplankton exhibited normal DVM patterns (down during the day, up at night) across sampling months. The weighted mean depth (WMD) of all zooplankton did not show a significant correlation with the WMD of the dominant phytoplankton and chlorophyll-a. However, a negative relationship was observed between the distribution of zooplankton and water temperature in January, March, and July 2010, but the relationship was relatively weak (R2 between 0.1 and 0.4). The vertical distribution of zooplankton was primarily affected by water transparency (P0.05), whereas the factors inducing DVM behaviour differed between large and small zooplankton. Predation avoidance and phototactic behaviour may be the dominant factors influencing DVM of large species, whereas only phototaxis contributed to the migratory behaviour of small species.

Keywords

Weighted mean depth; zooplankton; Lake Erhai; diel vertical migration; water transparency.

Supporting Agencies

the National Major Technology Projects of the Water Pollution Control and Management and the National Nature Science Foundation

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Submitted: 2013-02-01 04:26:44
Published: 2014-03-26 13:34:03
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Copyright (c) 2014 Cuilin Hu, Shengrui Wang, Longgen Guo, Ping Xie

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