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Decadal changes in phytoplankton color index and selected calanoid copepods in continuous plankton recorder data from the Scotian Shelf

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Abstract:

Continuous plankton recorder data for phytoplankton color index, total diatoms, Calanus finmarchicus stages 1–4 and 5–6, C. glacialis, C. hyperboreus, and ParacalanusPseudocalanus spp. collected between the years 1961 and 1998 in the Canadian Atlantic region were analyzed for geographic and temporal changes. Significant differences in both geographic and temporal scales were detected. Changes were observed in all taxa during 1991–1998 with the phytoplankton color index increasing significantly (P = 0.05). A shift in the climatology occurred after 1991 as concentrations of C. finmarchicus and ParacalanusPseudocalanus became significantly higher (P = 0.05) in the first 3 months of the year compared with the years 1961–1974. Multiple linear regressions calculated between various biological taxa and the storm, temperature, and stratification indices showed that these physical indices explained between 21 and 51% of the multiple regression variance.

Des données sur l'indice de couleur du phytoplancton, les diatomées totales, les stades 1–4 et 5–6 de Calanus finmarchicus, C. glacialis, C. hyperboreus et ParacalanusPseudocalanus obtenues à l'aide d'un enregistreur en continu du plancton de 1961 à 1998 dans la région canadienne de l'Atlantique ont permis d'en étudier les variations géographiques et temporelles. Des différences significatives sont apparues tant à l'échelle géographique qu'à l'échelle temporelle. Des modifications sont survenues chez tous les taxons de 1991 à 1998 et l'indice de couleur du phytoplancton a augmenté significativement (P = 0,05). Un changement dans la climatologie s'est produit après 1991 et les concentrations de C. finmarchicus et de ParacalanusPseudocalanus étaient significativement plus élevées durant les trois premiers mois de l'année par comparaison avec les années 1961–1974. Des régressions multiples linéaires calculées entre les données biologiques, d'une part, et les tempêtes, les températures et les indices de stratification, d'autre part, montrent que ces indices physiques expliquent entre 21 et 51% de la variance de la régression multiple.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: 2001-04-01

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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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