Modern dinoflagellate cyst assemblages in surface sediments of Nunatsiavut fjords (Labrador, Canada)
| Autor: | André Rochon, Thomas Richerol, Reinhard Pienitz |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Palynology
010506 paleontology geography geography.geographical_feature_category 010504 meteorology & atmospheric sciences biology Climate oscillation Dinoflagellate Paleontology Species diversity Fjord Oceanography biology.organism_classification 01 natural sciences Subarctic climate 13. Climate action Dinocyst Dominance (ecology) 14. Life underwater Geology 0105 earth and related environmental sciences |
| Zdroj: | Marine Micropaleontology |
| ISSN: | 0377-8398 |
| DOI: | 10.1016/j.marmicro.2012.03.002 |
| Popis: | In order to document long-term climate cycles and predict future climate trends for the Arctic, geological records archived in ocean sediments can help establish the link between historical and pre-historical sea-surface parameters. Dinoflagellate cysts (dinocysts) are used as proxy indicators of sea-surface parameters (temperature, salinity, sea-ice cover, primary productivity) jointly with transfer functions and a modern dinocyst reference database, to reconstruct the evolution of sea-surface conditions at decadal and millennial timescales. Here we present the surface distribution of recent dinocyst assemblages in 13 surface samples collected in four Nunatsiavut fjords (northern Labrador, Canada) along a latitudinal gradient, and their relationship with various environmental and biological parameters. Dinocyst concentrations in surface sediments increased from the inner to the outer part of each fjord and also from the northernmost to the southernmost fjords. There was also a southward increase in the species diversity with an occurrence and a dominance of cysts from autotrophic dinoflagellates. The presence of cysts of the calcareous dinoflagellate species Scrippsiella cf. S. crystallina in Anaktalak Fjord, where mining activities are underway, appears to be an indicator of human-related pollution within the fjord. |
| Databáze: | OpenAIRE |
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