Agglutinated abyssal foraminifers of the equatorial pacific

Burmistrova, I. I.; Khusid, T. A.; Belyaeva, N. V.; Chekhovskaya, M. P.

doi:10.1134/s0001437007060070

Cited by 10 publications

(6 citation statements)

References 17 publications

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“…Lagenammina atlantica was observed in high density during summer at Res station. This taxon is frequently found in the northeastern Adriatic Sea (Sabbatini et al, 2010) and is considered a passive detritivore organism consuming diatoms and bacteria (Burmistrova et al, 2007). This high density during summer could suggest that this species only found these optimal conditions during this season.…”

Section: Species Responses To Environmental Conditionsmentioning

confidence: 98%

Seasonal response of benthic foraminifera to anthropogenic pressure in two stations of the Gulf of Trieste (northern Adriatic Sea, Italy): the marine protected area of Miramare versus the Servola water sewage outfall

et al. 2019

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A seasonal survey of living benthic foraminifera was performed in 2013 in the Gulf of Trieste (N Adriatic Sea) to compare two marine coastal sites with different degrees of anthropogenic influence. An assessment of ecological quality statuses showed that the station located near the end of an urban pipeline (Ser station), has worse ecological conditions than the site located in a protected marine area (Res station) all year around. Stressed conditions at Ser station were mainly related to high contents of total organic carbon (TOC) and Zn in the bioavailable fraction, which were a limiting factor for the studied foraminiferal communities. Ammonia tepida, Bolivina spp., and Bulimina spp., which characterised this station, were the most tolerant taxa of the studied assemblage. Conversely, Elphidium spp., H. depressula, N. iridea, Quiqueloculina spp., R. nana and Textularia spp., could be considered less tolerant species as they benefitted from the less stressful conditions recorded at Res station, despite slightly higher concentrations of some potentially toxic elements (PTEs), especially Pb, being recorded in this station in comparison to Ser station. Furthermore, foraminiferal assemblages were found to be quite resilient over an annual cycle, being able to recover from a seasonal unbalanced state to a mature one. The beginning of spring and latest summer would be the best period to assess the ecological quality status to avoid any under- or overestimation of the health of the environment.

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Section: Species Responses To Environmental Conditionsmentioning

confidence: 98%

Seasonal response of benthic foraminifera to anthropogenic pressure in two stations of the Gulf of Trieste (northern Adriatic Sea, Italy): the marine protected area of Miramare versus the Servola water sewage outfall

et al. 2019

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“…Saidova (1974Saidova ( , 2000 also described different associations of foraminifera, related to seafloor topography within a 23 × 23 km area at the western end of the CCZ (Appendix B; Supplementary Material). A later Russian contribution (Burmistrova et al, 2007) summarizes the distribution of agglutinated species in samples from three areas, two in the central part of the CCZ (4918-4970 m depth) and the third to the east of the CCZ in the Guatemala Basin (3350-4040 m). Fifty of the 68 species listed are recorded from the two CCZ areas.…”

Section: Other Foraminiferamentioning

confidence: 99%

The Biodiversity and Distribution of Abyssal Benthic Foraminifera and Their Possible Ecological Roles: A Synthesis Across the Clarion-Clipperton Zone

et al. 2021

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Benthic foraminiferal research in the North Pacific has a long history, with works published over a century ago providing important information about the taxonomy and distribution of morphospecies. These studies focused mainly on areas outside the Clarion-Clipperton Zone (CCZ). Our knowledge of foraminiferal faunas within the CCZ originates largely from recent baseline investigations related to likely future seabed mining of the polymetallic nodule deposits. These have revealed highly diverse assemblages of sediment-dwelling morphospecies among the meiofauna and macrofauna, as well as megafaunal xenophyophores and nodule-attached fauna. Morphological analyses have been complemented by metabarcoding studies that yielded even higher numbers of molecular species (Operational Taxonomic Units - OTUs). Monothalamids, the vast majority undescribed, constitute a substantial proportion of both morphological and molecular datasets, with multichambered agglutinated and calcareous foraminifera being less common. Their importance in this abyssal (>4,000 m depth) habitat likely reflects food limitation combined with carbonate dissolution close to and below the carbonate compensation depth. Literature records, supported in a few cases by genetic data, suggest that many morphospecies found in the CCZ have wide geographical distributions across the Pacific abyss and in other oceans. At smaller spatial scales (several 100s of kilometers) there is a general uniformity in assemblage composition. Nevertheless, many morphospecies are too rare to conclude anything about their geographical distributions. Similarly, the part played by benthic foraminifera in CCZ ecosystems is largely a matter of speculation, although their abundance across different size classes suggests that it is significant. Meiofauna-sized taxa that consume freshly-deposited organic detritus may be important in carbon cycling, particularly at the shallower, more eutrophic eastern end of the CCZ. Megafaunal xenophyophores can provide habitat structure for other organisms, potentially enhancing benthic biodiversity. Foraminifera of all sizes could be among the earliest recolonisers of disturbed or redeposited sediments. Their potential contributions in terms of both ecology and biodiversity make these protists significant members of benthic communities in the CCZ.

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“…Our samples also yielded small, multichambered foraminfera that are similar to those reported in previous studies of modern abyssal benthic foraminifera. They include agglutinated species (e.g., Cribrostomoides subglobosum, Cyclammina trullisata, Cystammina galatea, Cystammina pauciloculata, Deuterammina grahami, Glomospira spp., Hormosinella ovicula, Hyperammina cylindrica, Lagenammina difflugiformis, Paratrochammina scotiaensis, Reophax scorpiurus, Spiroplectammina subcylindrica, Hormosinella distans, Veleroninoides wiesneri), and calcareous species [Epistominella exigua, Nuttallides umbonatus, Cibicidoides mundulus (as C. cf mundulus), Fissurina staphyllearia and Melonis pompiliodes] previously reported from abyssal depths in the North and equatorial Pacific by authors such as Smith (1973), Burministrova et al (2007), and Enge et al (2012). Many of these are well-known morphospecies that are widely distributed in modern ocean basins (Gooday and Jorissen, 2012;Holbourn et al, 2013).…”

Section: Comparison With Modern Abyssal Assemblagesmentioning

confidence: 99%

The Contribution of Fine Sieve Fractions (63–150 μm) to Foraminiferal Abundance and Diversity in an Area of the Eastern Pacific Ocean Licensed for Polymetallic Nodule Exploration

Gooday

Goineau

2019

Front. Mar. Sci.

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The sieve mesh sizes used in benthic foraminiferal studies exert a strong influence on faunal densities and composition. We examined the consequences of including finer (63-150 µm) size classes in a study of Rose Bengal stained ('live') and dead foraminifera in 5 Megacorer samples (0-1 cm layer) from abyssal sites in the eastern Clarion-Clipperton Zone (CCZ; equatorial Pacific), a region with commercially significant deposits of polymetallic nodules. More than 60% of intact specimens originated from the finer (<150 µm) fractions, with over half being picked from 63 to 125 µm residues. Test fragments, mainly agglutinated tubes, were also abundant but were more evenly distributed between coarser and finer residues. The two fractions yielded the same main groups (a mixture of formal taxa and informal groupings) and were dominated by single-chambered forms ('monothalamids'), the majority undescribed. Some were disproportionately abundant in finer fractions: rotaliids in the stained ('live'), textulariids in the dead, and trochamminids, Lagenammina spp., Nodellum-like forms, saccamminids and spheres in both assemblages. However, the most striking difference was the much greater abundance of tiny, largely undescribed spherical agglutinated morphotypes in the <150-µm fractions. Our 5 samples yielded 462 morphospecies, of which 313 occurred in <150-µm fraction and 170 were confined to this fraction. Twelve of the 31 top-ranked species in the stained assemblage were more or less limited (>90%) to the finer fractions; the corresponding number for the stained + dead assemblage was 12 out of 35. Of the 46 most abundant species in the stained + dead assemblage, 35 were monothalamids (mainly spheres, Lagenammina spp., Nodellum-like forms, and saccamminids), the remainder being rotaliids (3), hormosinids (3), trochamminids (3) and textulariids (2). By far the most abundant species overall, a tiny agglutinated sphere, was almost entirely confined to the finer fractions. Although small foraminifera that pass through a 150-µm screen are time-consuming to analyze, they constitute an important

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Agglutinated abyssal foraminifers of the equatorial pacific

Cited by 10 publications

References 17 publications

Seasonal response of benthic foraminifera to anthropogenic pressure in two stations of the Gulf of Trieste (northern Adriatic Sea, Italy): the marine protected area of Miramare versus the Servola water sewage outfall

Seasonal response of benthic foraminifera to anthropogenic pressure in two stations of the Gulf of Trieste (northern Adriatic Sea, Italy): the marine protected area of Miramare versus the Servola water sewage outfall

The Biodiversity and Distribution of Abyssal Benthic Foraminifera and Their Possible Ecological Roles: A Synthesis Across the Clarion-Clipperton Zone

The Contribution of Fine Sieve Fractions (63–150 μm) to Foraminiferal Abundance and Diversity in an Area of the Eastern Pacific Ocean Licensed for Polymetallic Nodule Exploration

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