Invertebrate re-colonisation in Mariager Fjord (Denmark) after severe hypoxia. I. Zooplankton and settlement.

Benni Winding Hansen, Ea Stenalt, Jens Kjerulf Petersen, Christina Ellegaard

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

A severe hypoxic event was observed in the innermost 20 km of the Danish estuary Mariager Fjord during August 1997 where the entire water column was totally anoxic for two weeks causing extinction of almost all metazoa. A sampling programme was initiated the following spring and summer at three stations in the anoxic part of the estuary. We describe the re-colonisation by zooplankton and in particular meroplankton, and the subsequent potential settlement by bivalves, gastropods, polychaetes and cirripeds. Due to extinction of the benthic community the zooplankton organisms were considered recruited entirely from outside the study area. Two water intrusions from the open water Kattegat were identified based on calculations of mass balance of salt and on phytoplankton composition. Rotifers were the first zooplankters to appear followed by cladocerans and copepods. The meroplanktonic bivalve larvae were followed by polychaete larvae, gastropod larvae and last cirriped nauplii, all with a maximum density of 5X103-10X103 individuals m-2 d-1. Due to hypoxia the inner section of Mariager Fjord is susceptible to defaunation regularly, but the benthic diversity is remedied after a surprisingly short time by recolonisation from adjacent sections of the estuary.
Original languageEnglish
JournalOphelia
Volume56
Issue number3
Pages (from-to)197-213
ISSN0078-5326
Publication statusPublished - 2002
Externally publishedYes

Keywords

  • Kattegat North East Atlantic, North Atlantic, Atlantic Ocean
  • Mariager Fjord Denmark, Europe Palearctic region
  • benthic ecology
  • community composition
  • defaunation
  • ecological succession
  • estuaries habitat
  • food limitation
  • hypoxia
  • larval settlement
  • mortality
  • re-colonization
  • species density
  • species diversity
  • water columns
  • Animalia (Animals) - Animalia [33000] zooplankton common meroplankton
  • Animalia (Animals, Invertebrates) - Invertebrata [34000] invertebrate common
  • Annelida Invertebrata Animalia (Animals, Annelids, Invertebrates) - Polychaeta [65500] polychaete common larva
  • Aschelminthes Helminthes Invertebrata Animalia (Animals, Aschelminths, Helminths, Invertebrates) - Rotifera [51600] rotifer common
  • Crustacea Arthropoda Invertebrata Animalia (Animals, Arthropods, Crustaceans, Invertebrates) - Branchiopoda [75102] cladoceran common
  • Crustacea Arthropoda Invertebrata Animalia (Animals, Arthropods, Crustaceans, Invertebrates) - Cirripedia [75108] cirriped common larva nauplius
  • Crustacea Arthropoda Invertebrata Animalia (Animals, Arthropods, Crustaceans, Invertebrates) - Copepoda [75110] copepod common
  • Mollusca Invertebrata Animalia (Animals, Invertebrates, Mollusks) - Gastropoda [61200] gastropod common larva
  • Mollusca Invertebrata Animalia (Animals, Invertebrates, Mollusks) - Pelecypoda [61500] bivalve common larva
  • Plantae (Algae, Microorganisms, Nonvascular Plants, Plants) - Algae [13000] phytoplankton common
  • 07002, Behavioral biology - General and comparative behavior
  • 07003, Behavioral biology - Animal behavior
  • 07506, Ecology: environmental biology - Plant
  • 07508, Ecology: environmental biology - Animal
  • 07510, Ecology: environmental biology - Oceanography and limnology
  • 25502, Development and Embryology - General and descriptive
  • 64001, Invertebrata: comparative, experimental morphology, physiology and pathology - General
  • 64016, Invertebrata: comparative, experimental morphology, physiology and pathology - Aschelminthes
  • 64026, Invertebrata: comparative, experimental morphology, physiology and pathology - Mollusca
  • 64030, Invertebrata: comparative, experimental morphology, physiology and pathology - Annelida
  • 64054, Invertebrata:comparative, experimental morphology, physiology and pathology - Arthropoda: crustacea
  • Ecology, Environmental Sciences
  • simulation model mathematical and computer techniques
  • Behavior
  • Estuarine Ecology

Cite this

Hansen, Benni Winding ; Stenalt, Ea ; Petersen, Jens Kjerulf ; Ellegaard, Christina. / Invertebrate re-colonisation in Mariager Fjord (Denmark) after severe hypoxia. I. Zooplankton and settlement. In: Ophelia. 2002 ; Vol. 56, No. 3. pp. 197-213.
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author = "Hansen, {Benni Winding} and Ea Stenalt and Petersen, {Jens Kjerulf} and Christina Ellegaard",
year = "2002",
language = "English",
volume = "56",
pages = "197--213",
journal = "Ophelia",
issn = "0078-5326",
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Invertebrate re-colonisation in Mariager Fjord (Denmark) after severe hypoxia. I. Zooplankton and settlement. / Hansen, Benni Winding; Stenalt, Ea; Petersen, Jens Kjerulf; Ellegaard, Christina.

In: Ophelia, Vol. 56, No. 3, 2002, p. 197-213.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Invertebrate re-colonisation in Mariager Fjord (Denmark) after severe hypoxia. I. Zooplankton and settlement.

AU - Hansen, Benni Winding

AU - Stenalt, Ea

AU - Petersen, Jens Kjerulf

AU - Ellegaard, Christina

PY - 2002

Y1 - 2002

N2 - A severe hypoxic event was observed in the innermost 20 km of the Danish estuary Mariager Fjord during August 1997 where the entire water column was totally anoxic for two weeks causing extinction of almost all metazoa. A sampling programme was initiated the following spring and summer at three stations in the anoxic part of the estuary. We describe the re-colonisation by zooplankton and in particular meroplankton, and the subsequent potential settlement by bivalves, gastropods, polychaetes and cirripeds. Due to extinction of the benthic community the zooplankton organisms were considered recruited entirely from outside the study area. Two water intrusions from the open water Kattegat were identified based on calculations of mass balance of salt and on phytoplankton composition. Rotifers were the first zooplankters to appear followed by cladocerans and copepods. The meroplanktonic bivalve larvae were followed by polychaete larvae, gastropod larvae and last cirriped nauplii, all with a maximum density of 5X103-10X103 individuals m-2 d-1. Due to hypoxia the inner section of Mariager Fjord is susceptible to defaunation regularly, but the benthic diversity is remedied after a surprisingly short time by recolonisation from adjacent sections of the estuary.

AB - A severe hypoxic event was observed in the innermost 20 km of the Danish estuary Mariager Fjord during August 1997 where the entire water column was totally anoxic for two weeks causing extinction of almost all metazoa. A sampling programme was initiated the following spring and summer at three stations in the anoxic part of the estuary. We describe the re-colonisation by zooplankton and in particular meroplankton, and the subsequent potential settlement by bivalves, gastropods, polychaetes and cirripeds. Due to extinction of the benthic community the zooplankton organisms were considered recruited entirely from outside the study area. Two water intrusions from the open water Kattegat were identified based on calculations of mass balance of salt and on phytoplankton composition. Rotifers were the first zooplankters to appear followed by cladocerans and copepods. The meroplanktonic bivalve larvae were followed by polychaete larvae, gastropod larvae and last cirriped nauplii, all with a maximum density of 5X103-10X103 individuals m-2 d-1. Due to hypoxia the inner section of Mariager Fjord is susceptible to defaunation regularly, but the benthic diversity is remedied after a surprisingly short time by recolonisation from adjacent sections of the estuary.

KW - Kattegat North East Atlantic, North Atlantic, Atlantic Ocean

KW - Mariager Fjord Denmark, Europe Palearctic region

KW - benthic ecology

KW - community composition

KW - defaunation

KW - ecological succession

KW - estuaries habitat

KW - food limitation

KW - hypoxia

KW - larval settlement

KW - mortality

KW - re-colonization

KW - species density

KW - species diversity

KW - water columns

KW - Animalia (Animals) - Animalia [33000] zooplankton common meroplankton

KW - Animalia (Animals, Invertebrates) - Invertebrata [34000] invertebrate common

KW - Annelida Invertebrata Animalia (Animals, Annelids, Invertebrates) - Polychaeta [65500] polychaete common larva

KW - Aschelminthes Helminthes Invertebrata Animalia (Animals, Aschelminths, Helminths, Invertebrates) - Rotifera [51600] rotifer common

KW - Crustacea Arthropoda Invertebrata Animalia (Animals, Arthropods, Crustaceans, Invertebrates) - Branchiopoda [75102] cladoceran common

KW - Crustacea Arthropoda Invertebrata Animalia (Animals, Arthropods, Crustaceans, Invertebrates) - Cirripedia [75108] cirriped common larva nauplius

KW - Crustacea Arthropoda Invertebrata Animalia (Animals, Arthropods, Crustaceans, Invertebrates) - Copepoda [75110] copepod common

KW - Mollusca Invertebrata Animalia (Animals, Invertebrates, Mollusks) - Gastropoda [61200] gastropod common larva

KW - Mollusca Invertebrata Animalia (Animals, Invertebrates, Mollusks) - Pelecypoda [61500] bivalve common larva

KW - Plantae (Algae, Microorganisms, Nonvascular Plants, Plants) - Algae [13000] phytoplankton common

KW - 07002, Behavioral biology - General and comparative behavior

KW - 07003, Behavioral biology - Animal behavior

KW - 07506, Ecology: environmental biology - Plant

KW - 07508, Ecology: environmental biology - Animal

KW - 07510, Ecology: environmental biology - Oceanography and limnology

KW - 25502, Development and Embryology - General and descriptive

KW - 64001, Invertebrata: comparative, experimental morphology, physiology and pathology - General

KW - 64016, Invertebrata: comparative, experimental morphology, physiology and pathology - Aschelminthes

KW - 64026, Invertebrata: comparative, experimental morphology, physiology and pathology - Mollusca

KW - 64030, Invertebrata: comparative, experimental morphology, physiology and pathology - Annelida

KW - 64054, Invertebrata:comparative, experimental morphology, physiology and pathology - Arthropoda: crustacea

KW - Ecology, Environmental Sciences

KW - simulation model mathematical and computer techniques

KW - Behavior

KW - Estuarine Ecology

M3 - Journal article

VL - 56

SP - 197

EP - 213

JO - Ophelia

JF - Ophelia

SN - 0078-5326

IS - 3

ER -