Late glacial and Holocene Ostracoda from the Melilla cold-water coral mound field

Pirkenseer, Claudius; Spezzaferri, Silvia; Stalder, Claudio

doi:10.1007/s00015-018-0305-8

Cited by 4 publications

(3 citation statements)

References 25 publications

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“…11, Table 2) seems to confirm the assumption of Fletcher (2013) but disagrees with Terhzaz et al (2018) who suggested semiarid-subhumid climate during the interval from 6.29 to 5.14 ka. However, unstable environmental conditions during this time, as suggested by evidence of stress in the ostracod species Krithe praetexta (Pirkenseer, 2018) may account for the discrepancy.…”

Section: Interpretation and Discussionmentioning

confidence: 91%

Palynological Study of Carbonated Mounds during the Holocene along the Atlantic and Mediterranean Moroccan Margins

Rachid

Hssaïda

Hamoumi

et al. 2020

Review of Palaeobotany and Palynology

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A palynological study of carbonate mounds of Atlantic and Mediterranean Moroccan margins was conducted on sediment boxcores MD13-3441, MD13-3456, MD13-3461, MD13-3465, MD13-3468 collected during the oceanographic cruise MD 194/Eurofleet-GATEWAY, which took place on June 2013. The organic remaining revealed a dominance of dinoflagellate cysts over the continental fraction, which showed very low rates. The use of pollen data, despite their low representativity, is proving to be a valuable tool for the paleoclimate interpretation. The palynological quantitative and qualitative analysis revealed the evolution of the paleoenvironment and climate change of the carbonate mounds during this study interval. The terminal Pleistocene-basal Holocene passage highlighted by the dominance of cold taxa of dinoflagellate cysts. The presence and dominance of tree and shrub pollen coupled by the presence of altitudinal conifers confirmed a cold climate in both continental and marine environments. During the lower-middle Holocene, the variations in the relative frequencies of dinoflagellate cyst associations reflect the evolution of the paleoenvironment from inner neritic to oceanic. The recorded microflora shows a cyclicity during the lower Holocene from arid to semi-arid between 10.07 and 9.85 ka (the abundance of herbaceous and steppe), to become arid again around (9.69 ka) by the consistently high rate of herbaceous and steppe. In contrast, the paleoclimate recorded during the Middle Holocene is semi-humid to 6.29 ka (high rate of trees and shrubs) and evolves to a warm dry climate at 5.9-5.14 ka, reflected by the abundance of herbaceous and steppe.

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Section: Interpretation and Discussionmentioning

confidence: 91%

Palynological Study of Carbonated Mounds during the Holocene along the Atlantic and Mediterranean Moroccan Margins

Rachid

Hssaïda

Hamoumi

et al. 2020

Review of Palaeobotany and Palynology

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“…Rugocythereis horrida (Whatley and Coles 1987) and Macrosarisa bensoni Maddocks 1990 occur continuously throughout the core. Ostracods species with continual occurrence are not uncommon in the fossil record as demonstrated by Bradleya majorani Bergue et al 2019, in the Rio Grande Rise and Paracypris polita Sars 1866 in the Mediterranean (Pirkenseer et al 2018). Probably, taxa with continual occurrence are physiologically less influenced by the OMZ and thermocline depth changes, that triggers upslope/downslope migrations (Rodriguez-Lazaro and Cronin 1999).…”

Section: Discussionmentioning

confidence: 99%

Climatically induced changes in late Quaternary bathyal ostracod assemblages of the Camamu Basin, Brazil

et al. 2021

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Bathybic ostracods (i.e., bathyal and abyssal assemblages) are important indicators of temperature and productivity changes of Cenozoic marine ecosystems. The present work presents the first study on Quaternary ostracods of the Camamu Basin, off the state of Bahia, northeastern Brazilian continental margin. The analysis of 59 samples from the piston-core CMU 14 (14°24'S, 38°49'W; 965 m water depth), revealed rich and abundant assemblages. The 14 C accelerator mass spectrometry (AMS) dating indicates that the studied interval covers the last 108 kyr, corresponding to the oxygen stable isotope stages (MIS) 5 to 1. Comparison with data from previous publications allowed discernment of three groups of ostracod species in CMU 14: Pandemic Group of species registered in more than one oceanic basin; Atlantic/Mediterranean Group of species restricted to the Atlantic Ocean and Mediterranean; and Brazilian Group of species restricted to the Brazilian continental margin). Four new species are herein proposed: Cytherella pindoramensis sp. nov., Ambocythere amadoi sp. nov., Pseudobosquetina pucketti sp. nov., and Bythoceratina bonaterrae sp. nov. Ostracod occurrences reveal the influence of glacial/interglacial cycles on assemblages composition. Interglacial stages 5 and 1 in the Camamu Basin are characterized by the association Bythocypris affinis-Cytherella pindoramensis sp. nov.-Cytheropteron perlaria-Bradleya dictyon; glacial stages (i.e., 2 to 4) register decreased diversity, possibly due to lower oceanic productivity.

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“…Microfaunal assemblages (e.g., benthic foraminifera and ostracods) can provide a very important proxy to understand CWC dynamics, from their nucleation, growth and decline ( Margreth et al., 2009 ; Malinverno et al., 2010 ; Stalder et al., 2014 , 2015 ; Pirkenseer et al., 2018 ; Fentimen et al., 2018 ). However, no studies on living benthic foraminifera assemblages associated to CWC ecosystems have been conducted so far in the Alboran Sea.…”

Section: Introductionmentioning

confidence: 99%

Living benthic foraminifera from cold-water coral ecosystems in the eastern Alboran Sea, Western Mediterranean

Stalder

ElKateb

Spangenberg

et al. 2021

Heliyon

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Benthic foraminifera (protists with biomineralized tests) coupled with geochemical proxies are used for the first time to characterize present oceanographic conditions occurring in cold-water coral ecosystems (CWC) in the eastern Alboran Sea (Brittlestar Ridge and Cablier Mound), western Mediterranean Sea. Quantitative data on living (stained) benthic foraminifera from 5 box cores retrieved during the MD194 cruise on the RV Marion Dufresne reveal that these organisms are more diverse in presence of corals, where more numerous ecological niches occur than they are in pelagic adjacent sediments. These data confirm that CWC can be considered as “diversity hotspots” also for benthic foraminifera. Geochemical characterization shows that these sediments contain relatively fresh (labile) organic matter but also a reworked refractory component. In particular, the total organic carbon and the δ 13 C org values suggest that some of the organic matter may be a mixture of marine and reworked particulate organic matter, compared to typical values from temperate phytoplankton. The δ 15 N of the organic fraction suggests that important atmospheric N 2 -fixation and degradation processes occur in the region. Finally, our results show that a more effective advection of freshly exported particulate organic matter from the surface waters occur at the mound top rather than at the mound base or off-mound allowing some coral colonies to survive on the top of mounds in this region. The mud layer covering the coral rubble debris may suggest that the Brittlestar Ridge is today exposed to siltation preventing the growth of corals at the mound base or off-mound.

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Late glacial and Holocene Ostracoda from the Melilla cold-water coral mound field

Cited by 4 publications

References 25 publications

Palynological Study of Carbonated Mounds during the Holocene along the Atlantic and Mediterranean Moroccan Margins

Palynological Study of Carbonated Mounds during the Holocene along the Atlantic and Mediterranean Moroccan Margins

Climatically induced changes in late Quaternary bathyal ostracod assemblages of the Camamu Basin, Brazil

Living benthic foraminifera from cold-water coral ecosystems in the eastern Alboran Sea, Western Mediterranean

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