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

TY - JOUR

T1 - Cascading effects of the ctenophore Mnemiopsis leidyi on the planktonic food web in a nutrient limited estuarine system

AU - Dinasquet, Julie Vanessa

AU - Titelman, J.

AU - Møller, L.F.

AU - Setälä, O.

AU - Granhag, L.

AU - Andersen, T.

AU - Båmstedt, U.

AU - Haraldsson, M.

AU - Katajisto, T.

AU - Kragh, Theis

AU - Kuparinen, J.

AU - Schrøter, M.-L.

AU - Søndergaard, Morten

AU - Tiselius, P.

AU - Riemann, Lasse

PY - 2012/7/24

Y1 - 2012/7/24

N2 - 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.

AB - 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.

U2 - 10.3354/meps09770

DO - 10.3354/meps09770

M3 - Journal article

SN - 0171-8630

VL - 460

SP - 49

EP - 61

JO - Marine Ecology - Progress Series

JF - Marine Ecology - Progress Series

ER -