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Aquatic palynomorphs from modern marine sediments in a reconnaissance transect across the Northwest Passage – Baffin Bay region
Pienkowski, A.J.; Kennaway, S.; Lang, S.I. (2020). Aquatic palynomorphs from modern marine sediments in a reconnaissance transect across the Northwest Passage – Baffin Bay region. Mar. Micropaleontol. 156: 101825. https://dx.doi.org/10.1016/j.marmicro.2020.101825
In: Marine Micropaleontology. Elsevier: Amsterdam; New York; Oxford; Tokyo. ISSN 0377-8398; e-ISSN 1872-6186
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| Author keywords |
Acritarchs; Tintinnids; Foraminiferal linings; Canadian Arctic Archipelago; Microfossils; Proxies; Non-pollen palynomorph (NPP) |
| Auteurs | | Top |
- Pienkowski, A.J.
- Kennaway, S.
- Lang, S.I.
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| Abstract |
Surface sediments from 18 boxcores across the Canadian Arctic provide the first assessment of modern non-pollen, non-dinocyst palynomorph regional distribution patterns. Palynomorphs are abundant and well-preserved (~400–21,900 ind./g; average 5730 ind./g), comprising acritarchs, zoomorphs (invertebrate eggs, egg capsules, mouthparts), foraminiferal linings, tintinnid loricae, ciliate cysts, and freshwater algae. Acritarch P and Halodinium minor were the most abundant and widely distributed acritarchs (avg. ~410 and ~340 ind./g, respectively). Invertebrate eggs (avg. ~570 ind./g) and foraminiferal linings (avg. ~1600 ind./g) were prominent. Six tintinnid forms were identified, cf. Parafavella parumdentata (avg. ~40 ind./g; 10 stations) showing the widest distribution. Ciliate cysts included Strombidium? cyst A, a spherical, flask-shaped cell with short spines and a rounded base (avg. ~120 ind./g; 16 stations). Pediastrum sp. (avg. ~140 ind./g) and Botryococcus sp. (avg. ~1040 ind./g) were especially abundant in the west, likely delivered via rivers. Out of 14 environmental parameters only sedimentary biogenic silica (%Si(opal)) was significant in explaining palynomorph variation. At group level, tinitinnids showed the strongest positive correlation to %Si(opal). Individually, the tintinnid Acanthostomella? sp. 1, ciliate cyst Fusopsis? cyst A, and the acritarch Palaeostomocystis fritilla were almost solely and positively explained by %Si(opal). This suggests that %Si(opal) strongly determines palynomorph variability, particularly for microzooplankton, implying that siliceous organisms (diatoms) play an important role in shaping palynomorph content in the sedimentary record. Our data suggest that palynomorphs represent a valuable addition to organic-walled microfossils (dinocysts) routinely used in this region, offering a unique multiproxy glimpse into the ecosystem. |
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