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Terrestrial support of zooplankton biomass in northern rivers (invited)

Author:
  • Martin Berggren
  • Per Bengtson
  • Ana Soares
  • Jan Karlsson
Publishing year: 2018
Language: English
Pages:
Document type: Conference paper: abstract

Abstract english

The contribution of terrestrially-derived carbon to micro-crustacean zooplankton biomass (i.e. allochthony) has been previously studied in lakes and reservoirs, but little is known about allochthony in rivers. We hypothesized that restricted selective grazing in turbulent environments such as rivers would decouple zooplankton from specific microbial and algal food resources, such that their allochthony would mirror the allochthonous contribution to the bulk particle pool. Allochthony was analyzed in 13 widely distributed Swedish rivers, using a dual-isotope mixing model. Zooplankton biomasses were generally low, and allochthony in different micro-crustacean groups (Cladocera, Cyclopoida, Calanoida) varied from 2% to 77%. As predicted, there were no correlations between allochthony and variables such as Chlorophyll-a or bacterial production. Instead, allochthony was similar to the terrestrial contribution in the particulate organic matter, with relationships close to 1:1. The total zooplankton community allochthony was strongly related to the ecosystem metabolic balance between production and respiration, which in turn was dependent upon the ratio between total autochthonous organic carbon concentrations and water color. Our study suggests that micro-crustacean allochthony is regulated differently in rivers compared to in lacustrine systems.

Keywords

  • Biological Sciences

Other

ASLO Summer Meeting 2018
2018-06-10 - 2018-06-15
Victoria, Canada
Published
Per Bengtson
E-mail: per [dot] bengtson [at] biol [dot] lu [dot] se

Researcher

MEMEG

+46 46 222 37 60

E-F212

Sölvegatan 37, Lund

50

Research group

Microbial Ecology

Projects

Doctoral students and postdocs

PhD students, main supervisor

 

PhD students, assistant supervisor

Jian Li

Experimental setup