Dispersal, survival and delayed growth of benthic foraminiferal propagules

Alve, Elisabeth; Goldstein, Susan T.

doi:10.1016/j.seares.2009.09.003

Cited by 133 publications

(62 citation statements)

References 61 publications

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“…The strong dominance by calcareous taxa throughout the studied interval is compatible with the location of this site at a paleodepth of 1300–1500 m, considerably above the CCD during most of the studied time interval [ Pälike et al ., ]. The benthic foraminifera on Allison Guyot Site 865 generally represent cosmopolitan taxa [ Thomas , ; Hayward et al ., ], and no endemic species were identified, supporting the observations on modern taxa of the importance of a motile life stage [ Alve and Goldstein, , ].…”

Section: Discussionmentioning

confidence: 99%

“…Because of their geographic isolation, some authors consider the occurrence of endemic species typical [e.g., de Forges et al ., ], whereas others argue that the observed percentage of endemism may be biased by sampling problems [ McClain , ; McClain et al ., ] or that the interaction of currents does not affect the efficiency of larval dispersion [ Samadi et al ., ]. 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%

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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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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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“…Thus, the first foraminiferal propagules (juvenile forms) were transported by sea currents (Alve and Goldstein, 2010) from the south and west and settled on the seafloor that was exposed after the retreat of grounded ice. The proximal glaciomarine environment affected the foraminiferal assemblages and resulted in low species richness, biodiversity and low foraminiferal abundance.…”

Section: Glacier-proximal Unit (13 450-11 500 Cal Yr Bp)mentioning

confidence: 99%

Late Weichselian and Holocene palaeoceanography of Storfjordrenna, southern Svalbard

et al. 2015

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Abstract. Multiproxy analyses (including benthic and planktonic foraminifera, δ 18 O and δ 13 C records, grain-size distribution, ice-rafted debris, XRF geochemistry and magnetic susceptibility) were performed on a 14 C-dated marine sediment core from Storfjordrenna, located off of southern Svalbard. The sediments in the core cover the termination of Bølling-Allerød, the Younger Dryas and the Holocene and reflect general changes in the oceanography/climate of the European Arctic after the last glaciation. Grounded ice of the last Svalbard-Barents Sea Ice Sheet retreated from the coring site ca. 13 950 cal yr BP. During the transition from the subglacial to glaciomarine setting, Arctic Waters dominated the hydrography in Storfjordrenna. However, the waters were not uniformly cold and experienced several warmer spells. A progressive warming and marked change in the nature of the hydrology occurred during the early Holocene. Relatively warm and saline Atlantic Water began to dominate the hydrography starting from approximately 9600 cal yr BP. Although the climate in eastern Svalbard was milder at that time than at present (smaller glaciers), two periods of slight cooling were observed in 9000-8000 and 6000-5500 cal yr BP. A change in the Storfjordrenna oceanography occurred at the beginning of the late Holocene (i.e. 3600 cal yr BP) synchronously with glacier growth on land and enhanced bottom current velocities. Although cooling was observed in the Surface Water, Atlantic Water remained present in the deeper portion of the water column of Storfjordrenna.

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“…9.2%). This is a highly opportunistic taxon known to tolerate dysoxia (Alve and Goldstein, 2010), and in Green Bay Cave it was found only in the AC assemblage. The high volume of terrigenous organic matter entering the cave at Cliff Pool Sinkhole is perhaps the most significant environmental control on habitats colonized by the AC assemblage.…”

Section: Entrance Assemblagementioning

confidence: 99%

Ecology of Foraminifera and Habitat Variability in an Underwater Cave: Distinguishing Anchialine Versus Submarine Cave Environments

Hengstum

Scott

2011

The Journal of Foraminiferal Research

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Seventy-five surface «4 cm) sediment samples were collected throughout Green Bay Cave System, Bermuda to investigate foraminiferal ecology and habitat variability in underwater coastal caves. This cave is ideal for studying different cave environments because it consists of an anchialine cave environment connected to a submarine cave environment. Each sediment sample was analyzed for foraminifera, 1) 13 C org , C:N, organic matter content, CaC0 3 , and granulometry. Measurements of pH, salinity, dissolved oxygen, and temperature in the coastal aquifer distinguished the meteoric lens and saline groundwater. Q-mode cluster analysis on the foraminifera produced a dendrogram that segregates the anchialine and submarine cave environments, and subdivides each environment into distinct habitats consistent with local hydrogeology and sedimentology. The anchialine cave environment near the sinkhole is characterized by two groups of foraminifera: 1) the Meteoric Lens Assemblage living in the brackish meteoric lens within 60 cm of sea level, and 2) the Anchialine Cave Assemblage living in the saline groundwater. Helenina anderseni, Discorinopsis aguayoi, and other marsh foraminifera can persist in the brackish meteoric lens, which transitions into a more diverse assemblage dominated by Bolivina striatula and Rosalina globularis below the halocline. The boundary between the anchialine (terrestrially dominated) and submarine cave (marine-dominated) environments is demarcated by gross foraminiferal and sedimentary changes (1)13Corg from -24%0 to -18%0, C:N from 11.2 to 8.3) that correspond to the m~ximum point where terrestrial influences routinely impact the cave benthos. Three assemblages of foraminifera inhabit the submarine cave environment: 1) the Entrance Assemblage in the first -60 m of the submarine cave, dominated by Quinqueloculina; 2) the Circulated Submarine Cave Assemblage dominated by Spirillina vivipara' and Triloculina oblonga, and 3) the Isolated Submarine Cave Assemblage dominated by Spirophthalmidium emaciatum. Planktic tintinnids suggest that tidally forced saline groundwater circulation is transporting more nutrients and particulate organic matter to the Circulated Submarine Cave Assemblage than the Isolated Submarine Cave Assemblage. These results indicate that coastal caves are partitioned into specific environments that can be further subdivided into habitats by groundwater masses, sediment fluxes (terrestrial versus marine), and groundwater circulation. This implies that that cave foraminifera can be useful paleohydrogeologic, paleoclimatic, and Quaternary sea-level proxies.

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Dispersal, survival and delayed growth of benthic foraminiferal propagules

Cited by 133 publications

References 61 publications

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

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

Late Weichselian and Holocene palaeoceanography of Storfjordrenna, southern Svalbard

Ecology of Foraminifera and Habitat Variability in an Underwater Cave: Distinguishing Anchialine Versus Submarine Cave Environments

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