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Inhibition of copepod feeding by exudates and transparent exopolymer particles (TEP) derived from a Phaeocystis globosa dominated phytoplankton community. / Dutz, Jörg; Klein Breteler, W.C.M.; Kramer, G.

In: Harmful Algae, Vol. 4, No. 5, 2005, p. 929-940.

Publication: Research - peer-reviewJournal article – Annual report year: 2005

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Dutz, Jörg; Klein Breteler, W.C.M.; Kramer, G. / Inhibition of copepod feeding by exudates and transparent exopolymer particles (TEP) derived from a Phaeocystis globosa dominated phytoplankton community.

In: Harmful Algae, Vol. 4, No. 5, 2005, p. 929-940.

Publication: Research - peer-reviewJournal article – Annual report year: 2005

Bibtex

@article{d390a421f9af4d47b0ca0b99b350ff7b,
title = "Inhibition of copepod feeding by exudates and transparent exopolymer particles (TEP) derived from a Phaeocystis globosa dominated phytoplankton community",
publisher = "Elsevier BV",
author = "Jörg Dutz and {Klein Breteler}, W.C.M. and G. Kramer",
year = "2005",
doi = "10.1016/j.hal.2004.12.003",
volume = "4",
number = "5",
pages = "929--940",
journal = "Harmful Algae",
issn = "1568-9883",

}

RIS

TY - JOUR

T1 - Inhibition of copepod feeding by exudates and transparent exopolymer particles (TEP) derived from a Phaeocystis globosa dominated phytoplankton community

A1 - Dutz,Jörg

A1 - Klein Breteler,W.C.M.

A1 - Kramer,G.

AU - Dutz,Jörg

AU - Klein Breteler,W.C.M.

AU - Kramer,G.

PB - Elsevier BV

PY - 2005

Y1 - 2005

N2 - We investigated if (1) dissolved compounds excreted by Phaeocystis globosa and (2) transparent exopolymer particles (TEP) formed from carbohydrates excreted into the water affect the feeding of nauplii and females of the calanoid copepod Temora longicornis during a P. globosa bloom. Copepod grazing on the diatom Thalassiosira weissflogii in the presence of these possible grazing deterrents was measured during three successive weeks of a mesocosm study, simulating the development of a P. globosa bloom. Our results demonstrate no indication for the presence of feeding deterrents in the dissolved phase, but a strong inhibitory effect of transparent exopolymer particles (TEP) on the consumption of algae by both nauplii and adult copepods. The inhibitory effect of TEP was connected to the accumulation of DOM during the progress of the bloom. We suggest that a reduction in the grazing pressure of zooplankton may increase the survival of the liberated single cells during disruption of colonies and allow seeding populations to persist. Furthermore, P. globosa reduces the trophic efficiency of the food web not only by withdrawal of its colonies from grazing but also by a relaxation of the grazing pressure on co-occurring phytoplankton and by alteration of the food web structure via TEP production.

AB - We investigated if (1) dissolved compounds excreted by Phaeocystis globosa and (2) transparent exopolymer particles (TEP) formed from carbohydrates excreted into the water affect the feeding of nauplii and females of the calanoid copepod Temora longicornis during a P. globosa bloom. Copepod grazing on the diatom Thalassiosira weissflogii in the presence of these possible grazing deterrents was measured during three successive weeks of a mesocosm study, simulating the development of a P. globosa bloom. Our results demonstrate no indication for the presence of feeding deterrents in the dissolved phase, but a strong inhibitory effect of transparent exopolymer particles (TEP) on the consumption of algae by both nauplii and adult copepods. The inhibitory effect of TEP was connected to the accumulation of DOM during the progress of the bloom. We suggest that a reduction in the grazing pressure of zooplankton may increase the survival of the liberated single cells during disruption of colonies and allow seeding populations to persist. Furthermore, P. globosa reduces the trophic efficiency of the food web not only by withdrawal of its colonies from grazing but also by a relaxation of the grazing pressure on co-occurring phytoplankton and by alteration of the food web structure via TEP production.

U2 - 10.1016/j.hal.2004.12.003

DO - 10.1016/j.hal.2004.12.003

JO - Harmful Algae

JF - Harmful Algae

SN - 1568-9883

IS - 5

VL - 4

SP - 929

EP - 940

ER -