Diel, Tidal and Vertical Variations of Phytoplankton and Its Environment in Frobisher Bay

• Main Author: Stephen Lc. Hsiao
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Published: 1991
• Subjects: Arctic; Frobisher Bay; Lumiere; Phytoplankton
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.575.6566; http://pubs.aina.ucalgary.ca/arctic/arctic45-4-327.pdf

1, 3,5,7, 10,20 and 30 m at 3 h intervals through a tidal cycle in the summer in Frobisher Bay. Light, temperature, salinity and nutrients varied vertically. Concentration of chlorophyll a, species com-position, number of species and diversity also exhibited a pronounced vertical variation, while phytoplankton cell numbers and the evenness of the species distribution was uniform through the water column. Phytoplankton biomass and composition changed considerably with time. However, diel variations in species diversity and evenness were minor under the existing environmental conditions, where only light fluctuated significantly. The integrated values of biomass, nutrients and mean temperature and salinity showed neither significant diel nor tidal variations. Key words: arctic phytoplankton, biomass, species composition, abundance, diversity, environmental factors d S U M E. En tte, on a effectut des prtltvements de phytoplancton et proctdt B des mesures environnementales 5 des profondeurs de 0, 1, 3, 5, 7, 10, 20 et 30 m, B des intervalles de 3 h, durant un cycle de marte, dans la baie Frobisher. La lumitre, la temptrature, la salinitt et les ClCments nutri-tifs variaient verticalement. La teneur en chlorophylle a, la varittt des esptces, le nombre des especes et la diversitt montraient aussi une nette varia-tion verticale, tandis que le nombre de cellules de phytoplancton et l’uniformitk de la distribution des especes ttaient les m&mes dans toute la colonne d’eau. La biomasse et la composition du phytoplancton changeaient considtrablement en fonction du temps. Cependant, les variations nycthtmtrales dans la diversitt et l’uniformitt des esptces ttaient minimes dans les conditions ambiantes du moment, oti seule la lumiere fluctuait de faqon signi-ficative. Les valeurs inttgrtes de la biomasse, des Bltments nutritifs ainsi que de la temptrature et de la salinitt moyennes ne montraient pas de varia-