Heterogeneity of environments in a coastal lagoon mouth by the comparison between living and dead benthic foraminiferal assemblages (Ria de Aveiro Portugal)

Martins, Maria Virgínia Alves; Hohenegger, Johann; Frontalini, Fabrizio; Laut, Lázaro; Miranda, Paulo; Rodrigues, Maria Antonieta da Conceição; Duleba, Wânia; Geraldes, Mauro César; Rocha, Fernando

doi:10.1016/j.ecss.2018.08.018

Cited by 9 publications

(4 citation statements)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The living strategy of foraminifera also plays a role, for example epibenthic foraminifera, living at the sediment-water interface, are particularly prone to transport (Jorissen and Whittling, 1999;Murray, 2006). In areas dominated by strong current regimes, such as estuaries or coastal lagoon mouths, differences between DAs and LAs are known to be considerable (Alve and Murray, 1995;Martins et al, 2018). Therefore, this study documents, for the first time, the differences between LAs and DAs and the impact of current dynamics on foraminiferal distributions in a CWC environment.…”

Section: Introductionmentioning

confidence: 63%

“…A number of these have been proposed to explain differences between living foraminiferal (biocoensis) assemblages (LAs) and dead foraminiferal (thanatocoensis) assemblages (DAs) at the sediment surface (Murray, 2006 and references therein). Life processes, such as species-specific reproduction rates and seasonality, explain in part these disparities (Murray, 2006;Martins et al, 2018). Post-mortem processes, such as test transport, physical breakage, dissolution, bioerosion and bioturbation also have an important impact.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Impact of bottom water currents on benthic foraminiferal assemblages in a cold-water coral environment: The Moira Mounds (NE Atlantic)

Fentimen

Rüggeberg

et al. 2020

Marine Micropaleontology

View full text Add to dashboard Cite

Strong bottom currents play a key role in cold-water coral environments by shaping their morphology and providing the necessary food for the corals to thrive. This study investigates the differences between living and dead benthic foraminiferal assemblages in such environments, more precisely on the Moira Mounds (NE Atlantic). A specific focus is to understand the role of currents and their influence on the taphonomy of benthic foraminiferal assemblages. Here, we analyze high-resolution sediment grain size distributions coupled with benthic foraminiferal assemblage composition to assess how much deep-sea bottom currents affect benthic foraminiferal assemblages. We suggest that the dead benthic foraminiferal assemblage consists of a reworked glacial fauna associated with contemporary species. Reworked glacial species (Elphidium excavatum, Sigmoilopsis schlumbergeri) are the most abundant. Dominant species that are present almost exclusively in the living assemblage (Alabaminella weddellensis, Nonionella iridea, Trifarina spp.) are associated with high phytodetritus input, possibly as a response to the later phase of the North-east Atlantic spring bloom. Dead assemblages are further characterized by the scarcity of organic-walled agglutinated foraminifera in comparison to living assemblages. Sediment grain size distributions show that the downslope Moira Mounds consist of well-sorted fine sand, typical of contourite deposits in the area. Grain size distributions and the average Shannon diversity of living and dead foraminiferal assemblages indicate that the coral cover offers a sheltered environment, baffling eroded sediment and preventing post-mortem transport of dead foraminifera. We conclude that cold-water coral environments provide a valuable paleoenvironmental archive by trapping sediment in an otherwise non-depositional system.

show abstract

Section: Introductionmentioning

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Impact of bottom water currents on benthic foraminiferal assemblages in a cold-water coral environment: The Moira Mounds (NE Atlantic)

Fentimen

Rüggeberg

et al. 2020

Marine Micropaleontology

View full text Add to dashboard Cite

show abstract

“…These species have short life cycles and they are able to rapidly increase their abundance when the environmental conditions are favourable (Martins et al, 2018). Permanently attached forms belonging to morphotype A (permanently attached forms), A* (long-living sessile attached forms) and SB (sessile, symbiont bearing) were poorly represented in all the investigated samples.…”

Section: Epiphytic Assemblagesmentioning

confidence: 98%

“…The dissimilarity between living and dead benthic foraminiferal assemblages in the shallow coastal area of Esperance Bay could be attributed to processes of sedimentary dynamic and the instability of physicochemical parameters that are unfavorable factors for the development of large living foraminiferal communities. The relationship between dead and living assemblages has not been fully understood yet, due to the small number of investigations (Dimiza et al, 2016;Martins et al, 2016Martins et al, , 2018Martins et al, , 2019a.…”

Section: Samples For Foraminiferal Investigation Were Preserved In Etmentioning

confidence: 99%

Foraminiferal biotopes in a shallow continental shelf environment: Esperance Bay (southwestern Australia)

Buosi

Tecchiato²,

Ibba

et al. 2020

Journal of Sea Research

View full text Add to dashboard Cite

The Great Australian Bight is a large carbonate cold water environment located on the central and western portions of the southern Australia. Seagrasses (Posidonia sp.) and macroalgae benthic habitats are widely distributed in the shallow water environment of southern Australia, contributing to the carbonate factory. This study investigated the distribution of modern benthic foraminiferal assemblages in the microtidal wave-dominated inner-shelf of Esperance Bay (southwestern Australia), that lies on the western margin of the Great Australian Bight. Benthic foraminifera were taxonomically identified and biotic parameters (species richness, density, Fisher-α index, Shannon-Weaver index, dominance) were calculated. Multivariate analyses (Hierarchical Cluster Analysis, Principal Component Analysis) were performed to understand foraminiferal distribution in the context of environmental conditions. Four main foraminiferal assemblages have been recognized: (I) a nearshore assemblage of dense seagrass meadow, dominated by Lamellodiscorbis dimidiatus, Elphidium craticulatum, Elphidium crispum, Cibicides lobatulus, II) a second assemblage associated with unvegetated seabed (approximately 30 m depth) with Lamellodiscorbis dimidiatus, Elphidium crispum, Quinqueloculina disparilis, III) a third assemblage in the central sector of the bay, characterized by a discontinuous and mixed seagrass-algae coverage with Lamellodiscorbis dimidiatus, Elphidium crispum, Elphidium macellum, Cibicides refulgens, and Quinqueloculina poeyana, and IV) an epiphytic assemblage of transitional zone from the coastline to the upper limit of a mixed seagrass-algae meadow, dominated by Elphidium crispum, Chrysalidinella dimorpha, Planulinoides biconcava, Planoglabratella opercularis, Rugobolivinella elegans. The spatial distribution of the four assemblages appears closely related to sediment texture, seagrass cover and depth, but it is also influenced by the shoreface morphology and the hydrodynamic energy. The understanding of the ecological parameters that influence benthic foraminiferal distribution, composition and assemblage structure within seagrass meadows is useful for paleoecological and paleoenvironmental interpretations.

show abstract

Spatial Heterogeneity of Marine Environment Changes: A Case Study in Laizhou Bay and Its Adjacent Waters, China

Wang

et al. 2021

J. Ocean Univ. China

View full text Add to dashboard Cite

Heterogeneity of environments in a coastal lagoon mouth by the comparison between living and dead benthic foraminiferal assemblages (Ria de Aveiro Portugal)

Cited by 9 publications

References 62 publications

Impact of bottom water currents on benthic foraminiferal assemblages in a cold-water coral environment: The Moira Mounds (NE Atlantic)

Impact of bottom water currents on benthic foraminiferal assemblages in a cold-water coral environment: The Moira Mounds (NE Atlantic)

Foraminiferal biotopes in a shallow continental shelf environment: Esperance Bay (southwestern Australia)

Spatial Heterogeneity of Marine Environment Changes: A Case Study in Laizhou Bay and Its Adjacent Waters, China

Contact Info

Product

Resources

About