Feeding, growth and metabolism of the marine heterotrophic dinoflagellate Gyrodinium dominans

Claire Schmoker, Peter Thor, Santiago Hernández-león, Benni Winding Hansen

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

Rates of grazing, growth, and respiration were studied in the heterotrophic dinoflagellate Gyrodinium dominans experiencing a single pulse of prey. Additionally, rates of grazing and growth were compared to those of G. dominans growing with constant concentrations of prey. The maximal specific growth rates of G. dominans with a single pulse of prey were similar to those observed when G. dominans was acclimated to constant levels of prey. Thus, our results support the hypothesis that the growth of G. dominans responds quickly to changes in the abundance of prey. Moreover, growth rates were negative when concentrations of prey were low; this would suggest that G. dominans is adapted to eutrophic conditions. Respiration rates were higher than growth rates when G. dominans was fed a single pulse of prey, and we hypothesize that the ability to respond numerically to a changing abundance of prey may inflict high metabolic costs. Gross growth efficiencies (GGEs), determined for G. dominans in both food availability conditions, were within the range of values reported for other heterotrophic protozoans, and while GGE decreased when concentrations of food were high in organisms fed a single pulse of food, the opposite was observed in organisms acclimatized to a constant level of food.


OriginalsprogEngelsk
TidsskriftAquatic Microbial Ecology
Vol/bind65
Udgave nummer1
Sider (fra-til)65-73
ISSN0948-3055
DOI
StatusUdgivet - 2011

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    Schmoker, Claire ; Thor, Peter ; Hernández-león, Santiago ; Hansen, Benni Winding. / Feeding, growth and metabolism of the marine heterotrophic dinoflagellate Gyrodinium dominans. I: Aquatic Microbial Ecology. 2011 ; Bind 65, Nr. 1. s. 65-73.
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    abstract = "Rates of grazing, growth, and respiration were studied in the heterotrophic dinoflagellate Gyrodinium dominans experiencing a single pulse of prey. Additionally, rates of grazing and growth were compared to those of G. dominans growing with constant concentrations of prey. The maximal specific growth rates of G. dominans with a single pulse of prey were similar to those observed when G. dominans was acclimated to constant levels of prey. Thus, our results support the hypothesis that the growth of G. dominans responds quickly to changes in the abundance of prey. Moreover, growth rates were negative when concentrations of prey were low; this would suggest that G. dominans is adapted to eutrophic conditions. Respiration rates were higher than growth rates when G. dominans was fed a single pulse of prey, and we hypothesize that the ability to respond numerically to a changing abundance of prey may inflict high metabolic costs. Gross growth efficiencies (GGEs), determined for G. dominans in both food availability conditions, were within the range of values reported for other heterotrophic protozoans, and while GGE decreased when concentrations of food were high in organisms fed a single pulse of food, the opposite was observed in organisms acclimatized to a constant level of food.",
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    Feeding, growth and metabolism of the marine heterotrophic dinoflagellate Gyrodinium dominans. / Schmoker, Claire; Thor, Peter; Hernández-león, Santiago; Hansen, Benni Winding.

    I: Aquatic Microbial Ecology, Bind 65, Nr. 1, 2011, s. 65-73.

    Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

    TY - JOUR

    T1 - Feeding, growth and metabolism of the marine heterotrophic dinoflagellate Gyrodinium dominans

    AU - Schmoker, Claire

    AU - Thor, Peter

    AU - Hernández-león, Santiago

    AU - Hansen, Benni Winding

    PY - 2011

    Y1 - 2011

    N2 - Rates of grazing, growth, and respiration were studied in the heterotrophic dinoflagellate Gyrodinium dominans experiencing a single pulse of prey. Additionally, rates of grazing and growth were compared to those of G. dominans growing with constant concentrations of prey. The maximal specific growth rates of G. dominans with a single pulse of prey were similar to those observed when G. dominans was acclimated to constant levels of prey. Thus, our results support the hypothesis that the growth of G. dominans responds quickly to changes in the abundance of prey. Moreover, growth rates were negative when concentrations of prey were low; this would suggest that G. dominans is adapted to eutrophic conditions. Respiration rates were higher than growth rates when G. dominans was fed a single pulse of prey, and we hypothesize that the ability to respond numerically to a changing abundance of prey may inflict high metabolic costs. Gross growth efficiencies (GGEs), determined for G. dominans in both food availability conditions, were within the range of values reported for other heterotrophic protozoans, and while GGE decreased when concentrations of food were high in organisms fed a single pulse of food, the opposite was observed in organisms acclimatized to a constant level of food.

    AB - Rates of grazing, growth, and respiration were studied in the heterotrophic dinoflagellate Gyrodinium dominans experiencing a single pulse of prey. Additionally, rates of grazing and growth were compared to those of G. dominans growing with constant concentrations of prey. The maximal specific growth rates of G. dominans with a single pulse of prey were similar to those observed when G. dominans was acclimated to constant levels of prey. Thus, our results support the hypothesis that the growth of G. dominans responds quickly to changes in the abundance of prey. Moreover, growth rates were negative when concentrations of prey were low; this would suggest that G. dominans is adapted to eutrophic conditions. Respiration rates were higher than growth rates when G. dominans was fed a single pulse of prey, and we hypothesize that the ability to respond numerically to a changing abundance of prey may inflict high metabolic costs. Gross growth efficiencies (GGEs), determined for G. dominans in both food availability conditions, were within the range of values reported for other heterotrophic protozoans, and while GGE decreased when concentrations of food were high in organisms fed a single pulse of food, the opposite was observed in organisms acclimatized to a constant level of food.

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