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Arctic boreal plankton species in the Northwest Atlantic

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Abstract:

The Continuous Plankton Recorder (CPR) survey has sampled regularly in the Northwest Atlantic since the early 1960s. Over the last decade there has been a dramatic increase in the abundance of a number of arctic boreal plankton species, notably Calanus hyperboreus (Krøyer), Calanus glacialis (Jaschnov), and Ceratium arcticum, and a southerly shift of the copepod C. hyperboreus in the CPR survey. In 1998, C. hyperboreus was recorded at its farthest position south in the survey, 39°N, off the Georges Bank shelf edge. Other studies have reported similar parallel biological responses on three trophic levels. During the late 1990s, production of Labrador Sea Water (LSW) has been at a high, a direct response to the phase of the North Atlantic Oscillation (NAO). The increase in abundance of these species, up to four standard deviations from the long-term mean, is linked to variability in the hydrography of the area and the driving climatic processes of the North Atlantic.

L'inventaire à l'aide d'enregistreurs de plancton en continu (CPR) se poursuit régulièrement dans le nord-ouest de l'Atlantique depuis le début des années 1960. Depuis dix ans, on a noté dans l'inventaire CPR une augmentation spectaculaire du nombre d'espèces planctoniques arctiques-boréales, en particulier de Calanus hyperboreus (Krøyer), de Calanus glacialis (Jaschnov) et de Ceratium arcticum, et un déplacement vers le sud du copépode C. hyperboreus. En 1998, C. hyperboreus a été recensé à son point le plus austral au cours de l'inventaire, à 39°N, au large du bord du banc George. D'autres études ont signalé des réactions biologiques semblables dans les trois niveaux trophiques. Durant la fin des années 1990, la production d'eau de la mer du Labrador (LSW) a été maximale en réaction directe à une phase de l'oscillation nord-atlantique (NAO). L'accroissement de densité de ces espèces, de l'ordre de jusqu'à quatre écarts-types au-dessus de la moyenne à long terme, est relié à la variabilité de l'hydrographie locale et aux processus climatiques moteurs de l'Atlantique nord.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: November 1, 2001

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  • Published continuously since 1901 (under various titles), this monthly journal is the primary publishing vehicle for the multidisciplinary field of aquatic sciences. It publishes perspectives (syntheses, critiques, and re-evaluations), discussions (comments and replies), articles, and rapid communications, relating to current research on cells, organisms, populations, ecosystems, or processes that affect aquatic systems. The journal seeks to amplify, modify, question, or redirect accumulated knowledge in the field of fisheries and aquatic science. Occasional supplements are dedicated to single topics or to proceedings of international symposia.
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