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Cascading effects of the ctenophore Mnemiopsis leidyi on the planktonic food web in a nutrient-limited estuarine system

Artikel i vetenskaplig tidskrift
Författare Julie Dinasquet
Josefin Titelman
Lene Friis Møller
O Setälä
Lena Granhag
T Andersen
U Båmstedt
Matilda Haraldsson
A Hosia
T Katajisto
T Kragh
J Kuparinen
ML Schrøter
M Søndergaard
Peter Tiselius
L Riemann
Publicerad i Marine Ecology Progress Serie
Volym 460
Sidor 49-61
ISSN 0171-8630
Publiceringsår 2012
Publicerad vid Institutionen för biologi och miljövetenskap
Sidor 49-61
Språk en
Länkar dx.doi.org/10.3354/meps09770
Ämnesord Bacterioplankton, Nanoflagellates, Microbial loop, Trophic levels, Ciliates, Baltic Sea
Ämneskategorier Marin ekologi

Sammanfattning

Increasing biomasses of gelatinous zooplankton presumably have major implications for the structure and function of marine food webs at large; however, current data on lower trophic levels are scarce, as most studies have focused on the immediate effects on zooplankton and fish larvae only. We examined the short-term impact of larvae and adults of the invasive ctenophore Mnemiopsis leidyi on a summer planktonic food web in the estuarine southern Baltic Sea, with special emphasis on the microbial loop. Grazing by M. leidyi reduced the mesozooplankton biomass, followed by increased dinoflagellate biomass in treatments with M. leidyi. While chlorophyll a increased most in the treatments with M. leidyi, small phytoplankton and ciliates decreased in all treatments. M. leidyi had a slight effect on bacterial abundance, but not on bacterial production, ectoenzymatic activities, or community composition. Undetectable levels of phosphate and a gradual accumulation of dissolved organic carbon during the experiment suggested a malfunctioning microbial loop scenario. The experiment shows that direct and indirect short-term effects of M. leidyi on the estuarine food web are limited to higher trophic levels and indicates that top-down and bottom-up consequences of M. leidyi expansions on the microbial loop will likely depend on local nutrient conditions.

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