Benthic foraminifera assemblages at Great Meteor Seamount

Heinz, Petra; Ruepp, D.; Hemleben, Christoph

doi:10.1007/s00227-003-1257-7

Cited by 29 publications

(15 citation statements)

References 48 publications

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“…This abyssal species is found typically in the carbonate-corrosive (and highly oligotrophic) environment between the calcite lysocline and the CCD, a zone that may coincide approximately with AABW. Sediment characteristics, including the availability of hard substrates such as glacial dropstones and manganese nodules for attached species (Earland, 1934;Veillette et al, 2007), are another factor, although these are generally more important in shallower, more energetic settings than in deeper water (Bergen and O'Neil, 1979;Heinz et al, 2004).…”

Section: Environmental Controls On Foraminiferal Distributionsmentioning

confidence: 99%

Deep-Sea Benthic Foraminifera

Gooday

2019

Encyclopedia of Ocean Sciences

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Section: Environmental Controls On Foraminiferal Distributionsmentioning

confidence: 99%

Deep-Sea Benthic Foraminifera

Gooday

2019

Encyclopedia of Ocean Sciences

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“…This species was not found in the living assemblages off Peru. It is common in the Atlantic Ocean, in particular under the upwelling off NW Africa and Namibia (Caralp et al, 1970;Lutze, 1980;Haake, 1980;Timm, 1992;Schmiedl et al, 1997;Heinz et al, 2004). Due to its infaunal lifestyle, Globobulimina turgida is rarely found living in surface sediment samples.…”

Section: The Role Of Benthic Foraminiferal Denitrification Along the mentioning

confidence: 99%

The role of benthic foraminifera in the benthic nitrogen cycle of the Peruvian oxygen minimum zone

et al. 2013

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The discovery that foraminifera are able to use nitrate instead of oxygen as an electron acceptor for respiration has challenged our understanding of nitrogen cycling in the ocean. It was thought before that only prokaryotes and some fungi are able to denitrify. Rate estimates of foraminiferal denitrification have been very sparse and limited to specific regions in the oceans, not comparing stations along a transect of a certain region. Here, we present estimates of benthic foraminiferal denitrification rates from six stations at intermediate water depths in and below the Peruvian oxygen minimum zone (OMZ). Foraminiferal denitrification rates were calculated from abundance and assemblage composition of the total living fauna in both surface and subsurface sediments, as well as from individual species specific denitrification rates. A comparison with total benthic denitrification rates as inferred by biogeochemical models revealed that benthic foraminifera probably account for the total denitrification in shelf sediments between 80 and 250 m water depth. The estimations also imply that foraminifera are still important denitrifiers in the centre of the OMZ around 320 m (29–50% of the benthic denitrification), but play only a minor role at the lower OMZ boundary and below the OMZ between 465 and 700 m (2–6% of total benthic denitrification). Furthermore, foraminiferal denitrification has been compared to the total benthic nitrate loss measured during benthic chamber experiments. The estimated foraminiferal denitrification rates contribute 2 to 46% to the total nitrate loss across a depth transect from 80 to 700 m, respectively. Flux rate estimates range from 0.01 to 1.3 mmol m⁻² d⁻¹. Furthermore we show that the amount of nitrate stored in living benthic foraminifera (3 to 3955 μmol L⁻¹) can be higher by three orders of magnitude as compared to the ambient pore waters in near-surface sediments sustaining an important nitrate reservoir in Peruvian OMZ sediments. The substantial contribution of foraminiferal nitrate respiration to total benthic nitrate loss at the Peruvian margin, which is one of the main nitrate sink regions in the world ocean, underpins the importance of the previously underestimated role of benthic foraminifera in global biogeochemical cycles

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“…Benthic foraminifera are characterized by a motile life stage (propagules) [ Alve and Goldstein , , ], and genetic information on a few deep‐sea species suggests that they are cosmopolitan [ Pawlowski et al ., ; Burkett et al ., ], thus highly efficient dispersers. Studies on recent assemblages from seamounts have not documented endemic benthic foraminiferal species [e.g., Heinz et al ., ], although abyssal species inhabiting elevated objects on the seafloor appear to differ between ocean basins [ Gooday et al ., ].…”

Section: Introductionmentioning

confidence: 99%

“…Because of their geographic isolation, some authors consider the occurrence of endemic species typical [e.g., de Forges et al, 2000], whereas others argue that the observed percentage of endemism may be biased by sampling problems [McClain, 2007;McClain et al, 2009] or that the interaction of currents does not affect the efficiency of larval dispersion [Samadi et al, 2006]. Benthic foraminifera are characterized by a motile life stage (propagules) Goldstein, 2003, 2010], and genetic information on a few deep-sea species suggests that they are cosmopolitan [Pawlowski et al, 2007;Burkett et al, 2015], thus Heinz et al, 2004], although abyssal species inhabiting elevated objects on the seafloor appear to differ between ocean basins [Gooday et al, 2015].…”

Section: Introductionmentioning

confidence: 99%

“…Meiofauna (including benthic foraminifera) may be reworked on the top of the seamount [Thistle et al, 1999;Wilson and Boehlert, 2004], and strong near-bottom flow may result in reduced abundance [Thistle and Levin, 1998]. The few studies on seamount foraminifera suggest that their distribution and diversity are indeed dominantly controlled by currents [Kustanowich, 1962;Nienstedt and Arnold, 1988;Ohkushi and Natori, 2001;Heinz et al, 2004;García-Muñoz et al, 2012], whereas food supply linked to primary productivity is generally seen as the main determinant of deep-sea benthic foraminiferal faunas, when oxygen availability is not a critical factor, which it becomes only at extremely low levels (~0.1 ml/L) [e.g., Jorissen et al, 1995Jorissen et al, , 2007Murray, 2001;Gooday, 2003].…”

Section: Introductionmentioning

confidence: 99%

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Late Paleocene‐middle Eocene benthic foraminifera on a Pacific seamount (Allison Guyot, ODP Site 865): Greenhouse climate and superimposed hyperthermal events

2016

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We investigated the response of late Paleocene-middle Eocene (~60-37.5 Ma) benthic foraminiferal assemblages to long-term climate change and hyperthermal events including the Paleocene-Eocene Thermal Maximum (PETM) at Ocean Drilling Program (ODP) Site 865 on Allison Guyot, a seamount in the Mid-Pacific Mountains. Seamounts are isolated deep-sea environments where enhanced current systems interrupt bentho-pelagic coupling, and fossil assemblages from such settings have been little evaluated. Assemblages at Site 865 are diverse and dominated by cylindrical calcareous taxa with complex apertures, an extinct group which probably lived infaunally. Dominance of an infaunal morphogroup is unexpected in a highly oligotrophic setting, but these forms may have been shallow infaunal suspension feeders, which were ecologically successful on the current-swept seamount. The magnitude of the PETM extinction at Site 865 was similar to other sites globally, but lower diversity postextinction faunas at this location were affected by ocean acidification as well as changes in current regime, which might have led to increased nutrient supply through trophic focusing. A minor hyperthermal saw less severe effects of changes in current regime, with no evidence for carbonate dissolution. Although the relative abundance of infaunal benthic foraminifera has been used as a proxy for surface productivity through bentho-pelagic coupling, we argue that this proxy can be used only in the absence of changes in carbonate saturation and current-driven biophysical linking.

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Benthic foraminifera assemblages at Great Meteor Seamount

Cited by 29 publications

References 48 publications

Deep-Sea Benthic Foraminifera

Deep-Sea Benthic Foraminifera

The role of benthic foraminifera in the benthic nitrogen cycle of the Peruvian oxygen minimum zone

Late Paleocene‐middle Eocene benthic foraminifera on a Pacific seamount (Allison Guyot, ODP Site 865): Greenhouse climate and superimposed hyperthermal events

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