Defining past ecological status and in situ reference conditions using benthic foraminifera: A case study from the Oslofjord, Norway

Dolven, Jane K.; Alve, Elisabeth; Rygg, Brage; Magnusson, Jan

doi:10.1016/j.ecolind.2012.12.031

Cited by 79 publications

(58 citation statements)

References 30 publications

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“…Based on data from Husum and Alve (2006), the total carbon accumulation rate (an over estimate of organic carbon flux) in fjords on the Skagerrak coasts is 8-185 g C m −2 yr −1 . The data from the study of five localities in the inner Oslofjord by Dolven et al (2013) show an organic carbon accumulation of 14-60 g C m −2 yr −1 . The C/N ratios for the study sites of Dolven et al (2013) range from 9 to 12 (Alve, unpublished data) as there are no major rivers entering the inner Oslofjord.…”

Section: Comparison Of Carbon Sources and Accumulation With Other Fjordsmentioning

confidence: 99%

“…Finally, recent studies have shown the potential of benthic foraminifera in environmental monitoring, using the same quantitative approaches as in conventional monitoring based on macro-invertebrates. The fossilizable nature of the foraminiferal tests means they can be used not only in monitoring over space (Bouchet et al, 2012) but also time (Dolven et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

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Spatial and temporal organic carbon burial along a fjord to coast transect: A case study from Western Norway

et al. 2017

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We investigated spatial and temporal changes in accumulation rate and source of organic carbon on a gradient along the Lysefjord and the more coastal Høgsfjord, Western Norway. This was achieved through analysis of total organic carbon and nitrogen content of sediment cores, which were radiometrically dated to the early 19th and 20th centuries for the Høgsfjord and Lysefjord, respectively. Benthic foraminifera (protists) were utilized to determine changes in organic carbon supply and Ecological Quality Status (EcoQS) by their accumulation rate (benthic foraminiferal accumulation rate (BFAR)), assemblage composition, species diversity, individual species responses and the composition of stable carbon isotopes of the tests (shells) of Cassidulina laevigata, Hyalinea balthica and Melonis barleeanus. Organic carbon accumulation rates were greatest closest to the river Lyse at the head of the Lysefjord (83-171 g C m −2 yr −1 ). The organic carbon at the head of the fjord is mainly terrestrial in origin, and this terrestrial influence becomes progressively less seaward. The δ 13 C in H. balthica tests as well as the benthic foraminiferal assemblage composition also showed a clear fjord to coast gradient. Organic carbon accumulation rates were lower and less variable at the seaward study sites (13-61 g C m −2 yr −1 ). We observe no temporal trend in organic carbon, carbon isotopes, EcoQS or foraminiferal assemblage composition in the Lysefjord. In contrast, in the Høgsfjord, there seems to have been an increase in organic carbon accumulation rates during the 1940s. Subsequent accumulation rates are stable. The foraminiferal assemblages in the surface sediments reflect a recent transition from good/moderate to moderate/bad EcoQS.

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Section: Comparison Of Carbon Sources and Accumulation With Other Fjordsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Spatial and temporal organic carbon burial along a fjord to coast transect: A case study from Western Norway

et al. 2017

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“…Today, the accurate localization is of high value for documenting species distributions in the 1950s, thus providing a reference base for present and future studies of species changes and the composition of species communities. The Oslofjord, in particular, has been strongly influenced by pollution and human activities, with maximal impact during the 1970-80s, when efforts to clean effluent discharges were implemented (Rosenberg et al 1987;Dolven et al 2013). All data that can be used to document the environmental status in earlier periods will be invaluable for present environmental assessments and for efforts to keep the fjord healthy with high biodiversity and a variety of species assemblages.…”

Section: Discussionmentioning

confidence: 99%

“…In the Oslofjord and coastal waters of the Skagerrak, environmental changes over eight to ten decades and more have been investigated from time series on shallow-water fish fauna (Fromentin et al 1997;Johannessen et al 2012), repeated sampling of Petersen's (1915) early softbottom studies (Rosenberg et al 1987) and reconstruction of past foraminiferal species assemblages (Dolven et al 2013). The collections of benthic fauna from the 1950s may supplement these studies by providing data for numerous species and a number of habitats that are not included in the presently examined historic data sets.…”

Section: Discussionmentioning

confidence: 99%

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Mapping of marine benthic invertebrates in the Oslofjord and the Skagerrak: sampling data of museum collections from 1950-1955 and from recent investigations

et al. 2015

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Oug E, Christiansen ME, Dobbe K, Rønning AH, Bakken T, Kongsrud JA. 2015. Mapping of marine benthic invertebrates in the Oslofjord and the Skagerrak: sampling data of museum collections from 1950-1955 and from recent investigations. Fauna norvegica 35: 35-45.Data from large sampling programmes for the mapping of marine invertebrates in the Oslofjord, Norway, and the Skagerrak, spanning more than six decades, are compiled and digitized to provide easy access in modern data repositories. Two sampling programmes undertaken in the period 1950-55 are still the most extensive mapping of marine benthic fauna in the area. Information from a total of more than 900 localities, or sampling events, covering all benthic habitats in the Oslofjord and coastal waters to Kvitsøy in Rogaland county, have been carefully digitized from field notes, original sea charts, and primary observations from sample handling in the field. Geographical coordinates referred to WGS84 chart datum have been fixed with a general accuracy of 20 m in the Oslofjord and 100-250 m in coastal areas, based on precise map sketches with cross-bearings to land objects and chart annotations. Most samples were collected using triangular, Agassiz and lightweight dredges. The collected material has been deposited in the collections of the Natural History Museum, University of Oslo. Two recent projects, 'Polyskag' and 'Bioskag' (2006-2014), are briefly described. The projects focused on the diversity of marine bristle worms (Polychaeta), inter alia providing material for molecular genetic analyses. Type localities for early described species and generally understudied biotopes were visited. The data from the 1950s, together with recent studies, constitute a considerable resource for studies of biodiversity, facilitated through the sharing of species records from the museum collections in modern data repositories. The accurate positioning of sampling localities in the 1950s is of particular value for documenting species distributions over long time spans, thus providing a reference base for studying present and future species changes and assessing the effects of human influence and environmental changes in the Oslofjord and the Skagerrak.

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Foraminifers (Benthic)

Binczewska¹,

Asteman²,

Farmer³

2015

Encyclopedia of Marine Geosciences

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Defining past ecological status and in situ reference conditions using benthic foraminifera: A case study from the Oslofjord, Norway

Cited by 79 publications

References 30 publications

Spatial and temporal organic carbon burial along a fjord to coast transect: A case study from Western Norway

Spatial and temporal organic carbon burial along a fjord to coast transect: A case study from Western Norway

Mapping of marine benthic invertebrates in the Oslofjord and the Skagerrak: sampling data of museum collections from 1950-1955 and from recent investigations

Foraminifers (Benthic)

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