In situ and experimental evidence for effects of elevated pH on protistan and metazoan grazers

Benni W. Hansen*, Christian M.B. Andersen, Per J. Hansen, Torkel Gissel Nielsen, Bent Vismann, Peter Tiselius

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Plankton succession was studied in a hyper-eutrophic stratified estuary, Mariager Fjord, Denmark. Above the pycnocline (15 m) pH increased from 8.5 to 9.2 and the oxygen increased to super saturation after 5 d of sunny weather due to high primary production. The protistan grazers were dominated by heterotrophic dinoflagellates and mixotrophic and heterotrophic ciliates. Metazooplankton was dominated by meroplankton, rotifers and the copepod, Acartia tonsa, all with a relatively low biomass. Cirriped nauplii occupied the upper strata while polychaete larvae populated the whole water column. Bivalve larvae occurred occasionally above the pycnocline even at very high pH. In pH challenge experiments, the mixotrophic ciliate Mesodinium rubrum was the least pH tolerant species, followed by Strombidium spp., which did not cope well with seawater pH > 8.5. Some heterotrophic dinoflagellates were more tolerant with net growth at pH > 9. The predominant rotifer Synchaeta sp. tolerated up to pH 9.5 and the copepod survived pH 10 but stopped producing eggs at pH 9.5 with unaffected egg hatching success. The polychaete and cirriped larvae tolerated pH 9.5, but bivalve larvae showed decreased survival already at pH 8.5. In situ distribution patterns and pH challenge experiments suggest that pH indeed contribute to structuring zooplankton distribution.
Original languageEnglish
JournalJOURNAL OF PLANKTON RESEARCH
Volume41
Issue number3
Pages (from-to)257-271
ISSN0142-7873
DOIs
Publication statusPublished - 2019

Keywords

  • Mariager Fjord
  • Eutrophication
  • Structuring factor
  • Zooplankton
  • Incubation experiments

Cite this

Hansen, Benni W. ; Andersen, Christian M.B. ; Hansen, Per J. ; Nielsen, Torkel Gissel ; Vismann, Bent ; Tiselius, Peter. / In situ and experimental evidence for effects of elevated pH on protistan and metazoan grazers. In: JOURNAL OF PLANKTON RESEARCH. 2019 ; Vol. 41, No. 3. pp. 257-271.
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abstract = "Plankton succession was studied in a hyper-eutrophic stratified estuary, Mariager Fjord, Denmark. Above the pycnocline (15 m) pH increased from 8.5 to 9.2 and the oxygen increased to super saturation after 5 d of sunny weather due to high primary production. The protistan grazers were dominated by heterotrophic dinoflagellates and mixotrophic and heterotrophic ciliates. Metazooplankton was dominated by meroplankton, rotifers and the copepod, Acartia tonsa, all with a relatively low biomass. Cirriped nauplii occupied the upper strata while polychaete larvae populated the whole water column. Bivalve larvae occurred occasionally above the pycnocline even at very high pH. In pH challenge experiments, the mixotrophic ciliate Mesodinium rubrum was the least pH tolerant species, followed by Strombidium spp., which did not cope well with seawater pH > 8.5. Some heterotrophic dinoflagellates were more tolerant with net growth at pH > 9. The predominant rotifer Synchaeta sp. tolerated up to pH 9.5 and the copepod survived pH 10 but stopped producing eggs at pH 9.5 with unaffected egg hatching success. The polychaete and cirriped larvae tolerated pH 9.5, but bivalve larvae showed decreased survival already at pH 8.5. In situ distribution patterns and pH challenge experiments suggest that pH indeed contribute to structuring zooplankton distribution.",
keywords = "Mariager Fjord, Eutrophication, Structuring factor, Zooplankton, Incubation experiments",
author = "Hansen, {Benni W.} and Andersen, {Christian M.B.} and Hansen, {Per J.} and Nielsen, {Torkel Gissel} and Bent Vismann and Peter Tiselius",
year = "2019",
doi = "10.1093/plankt/fbz020",
language = "English",
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In situ and experimental evidence for effects of elevated pH on protistan and metazoan grazers. / Hansen, Benni W.; Andersen, Christian M.B.; Hansen, Per J.; Nielsen, Torkel Gissel; Vismann, Bent; Tiselius, Peter.

In: JOURNAL OF PLANKTON RESEARCH, Vol. 41, No. 3, 2019, p. 257-271.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - In situ and experimental evidence for effects of elevated pH on protistan and metazoan grazers

AU - Hansen, Benni W.

AU - Andersen, Christian M.B.

AU - Hansen, Per J.

AU - Nielsen, Torkel Gissel

AU - Vismann, Bent

AU - Tiselius, Peter

PY - 2019

Y1 - 2019

N2 - Plankton succession was studied in a hyper-eutrophic stratified estuary, Mariager Fjord, Denmark. Above the pycnocline (15 m) pH increased from 8.5 to 9.2 and the oxygen increased to super saturation after 5 d of sunny weather due to high primary production. The protistan grazers were dominated by heterotrophic dinoflagellates and mixotrophic and heterotrophic ciliates. Metazooplankton was dominated by meroplankton, rotifers and the copepod, Acartia tonsa, all with a relatively low biomass. Cirriped nauplii occupied the upper strata while polychaete larvae populated the whole water column. Bivalve larvae occurred occasionally above the pycnocline even at very high pH. In pH challenge experiments, the mixotrophic ciliate Mesodinium rubrum was the least pH tolerant species, followed by Strombidium spp., which did not cope well with seawater pH > 8.5. Some heterotrophic dinoflagellates were more tolerant with net growth at pH > 9. The predominant rotifer Synchaeta sp. tolerated up to pH 9.5 and the copepod survived pH 10 but stopped producing eggs at pH 9.5 with unaffected egg hatching success. The polychaete and cirriped larvae tolerated pH 9.5, but bivalve larvae showed decreased survival already at pH 8.5. In situ distribution patterns and pH challenge experiments suggest that pH indeed contribute to structuring zooplankton distribution.

AB - Plankton succession was studied in a hyper-eutrophic stratified estuary, Mariager Fjord, Denmark. Above the pycnocline (15 m) pH increased from 8.5 to 9.2 and the oxygen increased to super saturation after 5 d of sunny weather due to high primary production. The protistan grazers were dominated by heterotrophic dinoflagellates and mixotrophic and heterotrophic ciliates. Metazooplankton was dominated by meroplankton, rotifers and the copepod, Acartia tonsa, all with a relatively low biomass. Cirriped nauplii occupied the upper strata while polychaete larvae populated the whole water column. Bivalve larvae occurred occasionally above the pycnocline even at very high pH. In pH challenge experiments, the mixotrophic ciliate Mesodinium rubrum was the least pH tolerant species, followed by Strombidium spp., which did not cope well with seawater pH > 8.5. Some heterotrophic dinoflagellates were more tolerant with net growth at pH > 9. The predominant rotifer Synchaeta sp. tolerated up to pH 9.5 and the copepod survived pH 10 but stopped producing eggs at pH 9.5 with unaffected egg hatching success. The polychaete and cirriped larvae tolerated pH 9.5, but bivalve larvae showed decreased survival already at pH 8.5. In situ distribution patterns and pH challenge experiments suggest that pH indeed contribute to structuring zooplankton distribution.

KW - Mariager Fjord

KW - Eutrophication

KW - Structuring factor

KW - Zooplankton

KW - Incubation experiments

U2 - 10.1093/plankt/fbz020

DO - 10.1093/plankt/fbz020

M3 - Journal article

VL - 41

SP - 257

EP - 271

JO - Journal of Plankton Research

JF - Journal of Plankton Research

SN - 0142-7873

IS - 3

ER -