Autumnal bottom-up and top-down impacts of Cyanea capillata: A mesocosm study

Aino Hosia*, Christina B. Augustin, Julie Dinasquet, Lena Granhag, Maria L. Paulsen, Lasse Riemann, Janne Markus Rintala, Outi Setälä, Julia Talvitie, Josefin Titelman

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)

Abstract

Jellyfish are effective predators on mesozooplankton and release large amounts of dissolved organic matter. Nevertheless, jellyfish initiated trophic cascades and bottom-up influences impacting lower trophic levels have received limited attention. We conducted a mesocosm experiment to quantify simultaneous top-down and bottom-up effects of a common jellyfish, Cyanea capillata, in a natural plankton community during autumn. Treatments were 0, 2 or 5 jellyfish per 2.5 m3 mesocosm, four replicates each, with initial additions of inorganic nutrients. Primary and bacterial production, species abundance and composition of several trophic levels and nutrient and carbon dynamics were followed during the 8-day experiment. Multivariate statistics and generalized additive mixed modelling were applied to test whether jellyfish carbon concentration (0-1.26 mg jellyC L-1) in the mesocosms affected the variables monitored. Unexpected negligible predatory impact of jellyfish on mesozooplankton was observed, potentially related to jellyfish senescence. Community compositions of bacteria, phytoplankton and mesozooplankton changed with time, but did not differ between treatments. However, nutrient regeneration by jellyfish was evident, and jellyfish had a positive impact on total and specific bacterial production, total primary production and the >10 μm chlorophyll a fraction. Bottom-up influences from abundant jellyfish could thus stimulate productivity in nutrient depleted autumnal surface waters.

Original languageEnglish
Pages (from-to)1042-1055
Number of pages14
JournalJOURNAL OF PLANKTON RESEARCH
Volume37
Issue number5
DOIs
Publication statusPublished - 10 Dec 2014
MoE publication typeA1 Journal article-refereed

Keywords

  • food web
  • gelatinous zooplankton
  • productivity
  • trophic interactions
  • trophodynamics

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