Informace o publikaci
Mollusc (Mya truncata) morphometrics and longevity reflect Early to Mid-Holocene fjord conditions in Central Svalbard
| Autoři | |
|---|---|
| Rok publikování | 2026 |
| Druh | Recenzovaný odborný článek |
| Časopis / Zdroj | NORWEGIAN JOURNAL OF GEOLOGY |
| Fakulta / Pracoviště MU | |
| Citace | |
| www | https://njg.geologi.no/publications/mollusc-mya-truncata-morphometrics-and-longevity-reflect-early-to-mid-holocene-fjord-conditions-in-central-svalbard/ |
| Doi | https://doi.org/10.17850/njg106-1-1 |
| Klíčová slova | Billefjorden; Mimerbukta; Mimerdalen; Kapp Ekholm; Left valves; Sea level changes; Palaeoecology; High Arctic; Shell metrics; Nearshore environments; Uplifted marine terraces |
| Přiložené soubory | |
| Popis | The growth and survival of the Arctic and boreal bivalve Mya truncata during the Early to Mid-Holocene in Billefjorden, central Svalbard, was predominantly influenced by basin-specific environmental factors. This study revealed that lack of nutrient availability caused by influx of large amounts of glacial meltwater and seabed conditions were critical in shaping population dynamics, shell morphology and growth rates. In stable environments M. truncata developed larger shell sizes and exhibited longer lifespans, averaging c. 20 years, approaching the species' maximum age for High Arctic conditions. Conversely, basins with higher sediment dynamics and nutrient scarcity resulted in smaller, thinner-shelled individuals. Morphological variations across basins reveal two distinct M. truncata morphotypes: thick-shelled specimens in stable, nutrient-rich basins and thinner-shelled forms in nutrient-poor, dynamic environments. Despite warmer conditions during the Holocene Thermal Maximum (HTM; similar to 9-6 cal. ka BP), shell growth rates were limited due to a decline in nutrient input from large influxes of glacial meltwater. Age-dependent growth patterns further highlight the influence of basin factors, with older populations in stable basins displaying enhanced growth compared with younger populations in dynamic parts of the fjord-system. The size and longevity of M. truncata could be used as a proxy for past winter sea-ice extent. This study underscores the critical interplay of local hydrological, oceanological and sedimentological conditions in shaping M. truncata populations. These findings emphasize that lack of nutrient availability caused by influx of glacial meltwater and seabed dynamics, rather than temperature alone, was a decisive factor during the Holocene. M. truncata serves as a valuable palaeoenvironmental indicator, reflecting basin-specific ecological dynamics in Arctic marine systems during a period characterised by climatic and environmental change. |
| Související projekty: |