Invertebrate re-colonisation in Mariager Fjord (Denmark) after a severe hypoxia. II. Blue mussels (<i>Mytilus edulis</i>L.)

Petersen, Jens Kjerulf; Stenalt, Ea; Hansen, Benni Winding

doi:10.1080/00785236.2002.10409500

Cited by 19 publications

(8 citation statements)

References 23 publications

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“…Eutrophication is a variable of particular importance in Danish estuaries and a variable causing a wide spectrum of local effects in estuaries, including modification of nutrient availability or light penetration, and occasionally severe hypoxia. Effects range from changes in species composition and diversity of macroalgae (Middelboe et al ., 1998), increased biomass of benthic macrofauna, which reflects secondary production (Josefson & Rasmussen, 2000), and, in some estuaries, complete defaunation due to anoxia (Fallesen et al ., 2000; Hansen et al ., 2002a; Petersen et al ., 2002). It is not known, however, whether there are general long‐term effects of eutrophication on macrofauna species richness in the area.…”

Section: Introductionmentioning

confidence: 99%

Species richness of benthic macrofauna in Danish estuaries and coastal areas

Josefson¹,

Hansen²

2004

Global Ecology and Biogeography

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Aim Cross-system comparisons of species richness of benthic macrofauna and environmental factors were made of estuaries and adjacent sea areas in order to reveal possible regulating factors of estuarine biodiversity.Location Denmark.Methods Annual species abundance and biomass data from four years, from unvegetated soft sea/estuary floors were used from 26 grids, of which 15 were situated in estuaries. Bottom water data for oxygen concentration, salinity, and temperature were obtained from stations in or close to, the grids. Data on nutrient loading, water residence time and morphology were obtained for whole estuaries. Species richness from the grids, standardized to the same sample size, were related to environmental variables using linear regression.Results Species richness was unrelated to oxygen deficiency and productivity, but positively related to salinity. However, an equally high degree of explanation ( R 2 ∼ 0.70) was obtained using a model where richness was positively related to saltwater flux, which was computed from estuary volume and residence time and corrected for freshwater flux. The relationship was present for the dominating groups with pelagic dispersal, Annelida and Mollusca, but not for Crustacea, where recruitment is mainly by benthic pathways. Saltwater flux was strongly positively correlated with salinity, illustrating the high importance of flux from adjacent sea areas for water renewal in Danish estuaries. Similarity of species composition was greater for sites within than between saltwater current pathways, and the increases of richness with saltwater flux and salinity in the estuaries was largely due to marine species occurring in the open sea areas.Conclusion Danish estuaries are largely open systems where a part of estuarine species richness is sustained by dispersal from a species pool in adjacent seas. Results are consistent with the barrier prediction of island biogeography theory, but not the island size prediction.

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Section: Introductionmentioning

confidence: 99%

Species richness of benthic macrofauna in Danish estuaries and coastal areas

Josefson¹,

Hansen²

2004

Global Ecology and Biogeography

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“…These are the pioneering opportunists that invade the area rapidly on reoxygenation, taking advantage of the undecomposed nutrients (Diaz & Rosenberg 1995;Nittrouer et al 1998;Wu 2002). The ubiquitous Mytilus edulis may thus be among the first to invade the deserted bottom after reoxygenation (Jørgensen 1980;Petersen et al 2002). This applies also to Balanus crenatus (White 2001).…”

Section: Hypoxia and Molluscsmentioning

confidence: 99%

Hypoxia in the Eemian: mollusc faunas and sediment mineralogy from Cyprina Clay in the southern Baltic region

Funder¹,

Balić-Žunić

2008

Boreas

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The Cyprina Clay at Mommark, southern Denmark, contains a unique record of a shallow threshold‐controlled fjord environment through an entire interglacial. Today, the area suffers from periodic severe hypoxia, and the Eemian mollusc faunas (dominated by the hypoxia‐tolerant Corbula gibba and Arctica islandica), the sediments' varying content of pyrite, calcite and gypsum, as well as evidence of shell‐dissolution all show that the area also suffered from oxygen stress during the Eemian. A comparison with previous faunal studies on Cyprina Clay indicates that the entire southwestern Baltic region suffered from oxygen stress of varying degree throughout the Eemian. At Mommark, the severity of hypoxia varies inversely with water depth, indicating control by sea level and water depth over the basin threshold. After an early phase of eustatic sea level rise came a prolonged period of isostatic emergence and regression. Although this isostasy pattern is different from the Holocene, the present isostatic uplift of the Baltic entranceways may have the same effect and add to the anthropogene hypoxia threat in the Baltic region.

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“…ciliary feeders like bivalve larvae and ciliates) suffer from food limitation (e.g. Petersen et al, 2002). In late summer, the zooplank-ton community additionally experiences deteriorating environmental conditions including anoxia and sulfide (Fenchel et al, 1995).…”

Section: Introductionmentioning

confidence: 99%

“…The protistan grazers, with short generation times, are dominated by a few completely heterotrophic species. The meroplankton are composed of several taxa (Hansen et al, 2002;Petersen et al, 2002), supplied by local populations and by the import from open water habitats. Predation pressure from pelagic zooplanktivores (fish and jellyfish) is modest and so is diurnal vertical migration due to anoxia below the pycnocline.…”

Section: Introductionmentioning

confidence: 99%

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

Hansen

Andersen

Hansen

et al. 2017

Journal of Plankton Research

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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.

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Invertebrate re-colonisation in Mariager Fjord (Denmark) after a severe hypoxia. II. Blue mussels (Mytilus edulisL.)

Cited by 19 publications

References 23 publications

Species richness of benthic macrofauna in Danish estuaries and coastal areas

Species richness of benthic macrofauna in Danish estuaries and coastal areas

Hypoxia in the Eemian: mollusc faunas and sediment mineralogy from Cyprina Clay in the southern Baltic region

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

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