NDLI: The cornucopia of chilly winters: Ocean quahog (Arctica islandica L., Mollusca) master chronology reveals bottom water nutrient enrichment during colder winters (North Sea)

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The cornucopia of chilly winters: Ocean quahog (Arctica islandica L., Mollusca) master chronology reveals bottom water nutrient enrichment during colder winters (North Sea)

Content Provider	Springer Nature Link
Author	Schöne, Bernd R. Kröncke, Ingrid Houk, Stephen D. Castro, Antuané D. Freyre Oschmann, Wolfgang
Copyright Year	2003
Abstract	We studied variations in annual shell growth rates of ten live-collectedArctica islandica specimens from three localities at the Dogger Bank in the central North Sea. Synchronous growth curves from contemporaneous specimens enabled the construction of a 65-year multi-locality master chronology. Stepwise multiple linear correlation analysis indicated a highly significant (p<0.01) negative relationship between annual shell growth and winter sea surface temperatures (SST) during the period of 1953 to 1995. Up to 27.5% of the variation in the annual shell growth is explained by winter temperature. We explain the higher growrh levels in colder winters by higher food supply. During warmer winters both the stratification and bottom water currents in the study area seem to be stronger and prevent downward-mixing of nutrients as well as settlement of food on the sea floor. During colder winters, however, the stratification weakens and phytoplankton produced in the cold surface layer reaches the sea floor. Long-term changes in shell growth rates are thus directly connected to hydrographic changes in the North Sea, which in turn are relared to fluctuations of the North Atlantic Oscillation (NAO).Our study demonstrates the usefulness ofArctica islandica for long-term, high-resolution environmental reconstructions and contributes to further understanding natural and anthropogenic variability in the environmental history of the North Sea.Die vorliegende Studie beschäftigt sich mit Variationen im jährlichen Schalenzuwachs von zehn lebend gefangenenArctica islandica Individuen von drei Lokalitäten auf der Doggerbank in der zentralen Nordsee. Aufgrund synchroner Verläufe der Wachstumskurven zeitgleich lebender Individuen konnten wir eine 65 Jahre umfassende Master-Chronologie erstellen. Schrittweise multiple lineare Korrelation indiziert einen hochsignifikanten (p<0.01) negativen Zusammenhang zwischen jährlichem Schalenzuwachs und Oberflächenwassertemperaturen (SST) während der Wintermonate über den Zeitraum von 1953 bis 1995. Bis zu 27,5% der Variation im jährlichen Zuwachs läßt sich durch Schwankungen der Wintertemperaturen erklären. Wir nehmen an, daß die höheren jährlichen Schalenzuwächse in kälteren Wintern mit höherem Nahrungsangebot zusammenhängen. Während wärmerer Winter scheint die vertikale Schichtung der Wassersäule im Nordosten der Doggerbank stärker zu sein. In Verbindung mit erhöhten Strömungen beeinträchtigt sie das Absinken des Phytoplanktons zum Meeresboden und verhindert ein Durchmischen von nährstoffreichen Oberflächenwassern und tieferen Wassermassen. Über längere Zeiträume sind die Nahrungsverfügbarkeit und damit das Schalenwachstum von Muscheln (hierArctica islandica) direkt an hydroklimatische Veränderungen gekoppelt, die in Verbindung mit der Variabilität der Nordatlantischen Oszillation (NAO) stehen.Unsere Untersuchungen demonstrieren, daß sichArctica islandica für langzeitliche und hochauflösende Umweltrekonstruktionen eignet. Unsere Studie leistet darüber hinaus einen Beitrag zum besseren Verständnis natürlicher und anthropogener Variabilitäten der Umweltgeschichte der Nordsee.
Starting Page	165
Ending Page	175
Page Count	11
File Format	PDF
ISSN	0080889X
Journal	Marine Biodiversity
Volume Number	32
Issue Number	1-2
Language	English
Publisher	Springer-Verlag
Publisher Date	2003-01-01
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	Arctica islandica shell growth master chronology nutrients SST hydrography NAO Dogger Bank North Sea Biodiversity Freshwater & Marine Ecology Plant Systematics/Taxonomy/Biogeography Animal Systematics/Taxonomy/Biogeography
Content Type	Text
Resource Type	Article
Subject	Aquatic Science Oceanography

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The cornucopia of chilly winters: Ocean quahog (Arctica islandica L., Mollusca) master chronology reveals bottom water nutrient enrichment during colder winters (North Sea)

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The cornucopia of chilly winters: Ocean quahog (Arctica islandica L., Mollusca) master chronology reveals bottom water nutrient enrichment during colder winters (North Sea)