Seasonal variations of phytoplankton dynamics in Nunatsiavut fjords (Labrador, Canada) and their relationships with environmental conditions

Simo-Matchim, Armelle-Galine; Gosselin, Michel; Blais, Marjolaine; Gratton, Yves; Tremblay, Jean‐Éric

doi:10.1016/j.jmarsys.2015.11.007

Cited by 14 publications

(18 citation statements)

References 94 publications

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“…Si(OH) 4 and PO 4 concentrations showed similar variations to that of N O 3 +NO 2 . However, in summer 2007, in contrast to N O 3 +NO 2 and Si(OH) 4 , PO 4 was never depleted in the surface waters (up to 10 m, Simo-Matchim et al 2016). A different pattern was observed in summer 2013, with NO 3 +NO 2 and PO 4 almost depleted in the surface waters (up to 10 m), while surface Si(OH) 4 concentrations reached 10 to 16 µmol l −1 at inner stations of N achvak and Okak (Table 2), suggesting high freshwater inputs from runoff in Nachvak and from the North River and Ikinet Brook in Okak.…”

Section: Nutrientsmentioning

confidence: 92%

“…(≤5 µm) and Phaeocystis pouchetii, and the chrysophyte Dinobryon balticum. These taxa were associated with nitrate-and silicic acid-depleted surface waters (Simo-Matchim et al 2016). Summer diatoms and chrysophytes were associated with cooler and less saline surface waters, respectively.…”

Section: Summers 2007 and 2013mentioning

confidence: 97%

“…In contrast to Nachvak and Okak, Saglek and Anaktalak are directly influenced by industrial and modern human activities. Detailed characteristics of the studied fjords can be found in Simo-Matchim et al (2016).…”

Section: Study Areamentioning

confidence: 99%

“…These results indicate that dissolved nitrogen was the nutrient in lowest availability for phytoplankton growth during summer. However, at stations with an Si(OH) 4 concentration lower than 2 µmol l −1 , diatoms were probably co-limited by dissolved silicon availability (see Simo-Matchim et al 2016).…”

Section: Summers 2007 and 2013mentioning

confidence: 99%

“…and Chaetoceros spp., as well as the prymnesiophyte Phaeocystis pouchetii (Hariot) Lagerheim, usually dominate these blooms (Gradinger & Baumann 1991, von Quillfeldt 2000, Lovejoy et al 2002. During summer, when surface nutrients are depleted, the maximum production is usually observed at the subsurface, close to the nutracline (Martin et al 2010) where the phytoplankton community is generally dominated by diatoms (Ardyna et al 2011, Ferland et al 2011, Simo-Matchim et al 2016) and/or autotrophic nanoflagellates (Ardyna et al 2017). In late summer and early fall, the decrease in water column stratification by surface cooling and wind mixing favours the supply of nutrients to surface waters.…”

Section: Introductionmentioning

confidence: 99%

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Summer and fall distribution of phytoplankton in relation to environmental variables in Labrador fjords, with special emphasis on Phaeocystis pouchetii

Simo-Matchim¹,

Gosselin²,

Poulin³

et al. 2017

Mar. Ecol. Prog. Ser.

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). In autumn, the community was dominated by unidentified flagellates, prymnesiophytes and diatoms, in various proportions from early to late fall. From a summer situation characterized by stronger stratification, higher incident irradiance and depleted nutrients in surface waters, it evolved to an autumn situation characterized by decreasing air temperature and irradiance associated with an environmental forcing (e.g. weather) allowing cooling and greater vertical mixing of the water column. Combining our observations with those from the literature, we suggest the following annual succession in the Labrador fjord phytoplankton community: (winter) dinoflagellates and small flagellated cells -(spring) Fragilariopsis spp., Chaetoceros spp., Thalassiosira spp. and Phaeocystis pouchetii -(summer) Chaetoceros spp., P. pouchetii and Chrysochromulina spp. -(fall) Gymnodinium/Gyrodinium spp., Chrysochromulina spp. and other flagellates. Overall, the protist richness was 2 times higher in fall than in summer, the highest richness being observed in early fall, with 201 taxonomic entries, 72 genera and 131 species identified.

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Section: Nutrientsmentioning

confidence: 92%

Section: Summers 2007 and 2013mentioning

confidence: 97%

Section: Study Areamentioning

confidence: 99%

Section: Summers 2007 and 2013mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Summer and fall distribution of phytoplankton in relation to environmental variables in Labrador fjords, with special emphasis on Phaeocystis pouchetii

Simo-Matchim¹,

Gosselin²,

Poulin³

et al. 2017

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

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Contrasting interannual changes in phytoplankton productivity and community structure in the coastal Canadian Arctic Ocean

Blais

Ardyna

Gosselin

et al. 2017

Limnology & Oceanography

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The rapid physical changes affecting the Arctic Ocean alter the growth conditions of primary producers. In this context, a crucial question is whether these changes will affect the composition of phytoplankton communities, augment their productivity, and eventually enhance food webs. We combined satellite and model products with in situ datasets collected during fall and provide new insights into the response of phytoplankton biomass and production in the Canadian Arctic by comparing an interior shelf (Beaufort Sea) and an outflow shelf (Baffin Bay). Correlation analysis was used to distinguish between seasonal and interannual variability and revealed that most biological variables are responding to the interannual pressures of climate change. In southeast Beaufort Sea, a change in phytoplankton community composition occurred, with a significant increase in diatoms from 2% (2002) to 37% (2010-2011) of the total protist abundance. In 2011, photosynthetic picoeukaryotes were twice as abundant as in 2002. For these two phytoplankton groups, abundance was correlated with the duration of the open-water period, which also increased and affected vertical stratification and sea-surface temperature. In contrast, there was a sharp decline in centric diatom abundance as well as in phytoplankton biomass and production in northern Baffin Bay over the years considered. These decreases were linked to changes in seasonal progression and sea-ice dynamics through their impacts on vertical stratification and freshwater input. Overall, our results highlight the importance of stratification and the duration of the open-water period in shaping phytoplankton regimes-either oligotrophic or eutrophic-in marine waters of the Canadian Arctic.

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Picophytoplankton distribution along Khatanga Bay-shelf-continental slope environment gradients in the western Laptev Sea

Белевич

Демидов

Makkaveev

et al. 2021

Heliyon

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The spatial variations of photosynthetic picoplankton abundance and biomass and the picoplankton's contribution to chlorophyll a concentration along the transect from Khatanga Bay to the continental slope in the western part of the Laptev Sea were studied in September 2017. Picoeukaryotes dominated in the picophytoplankton communities. Picophytoplankton in Khatanga Bay showed more variability than those over the Laptev shelf and continental slope: abundance and biomass were the highest in the southern part of the bay and markedly decreased with increasing salinity in its northern part. Picocyanobacteria were found over the shelf and slope at temperatures of +2.4 to -1.6°С and salinity from 22 to 34. Picophytoplankton contribution to total chlorophyll a on the shelf was higher than in Khatanga Bay. The study of picophytoplankton of Khatanga Bay and in the western Laptev Sea can serve as a baseline for future assessment of the Laptev Sea ecosystem response to interannual and climate changes.

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Seasonal variations of phytoplankton dynamics in Nunatsiavut fjords (Labrador, Canada) and their relationships with environmental conditions

Cited by 14 publications

References 94 publications

Summer and fall distribution of phytoplankton in relation to environmental variables in Labrador fjords, with special emphasis on Phaeocystis pouchetii

Summer and fall distribution of phytoplankton in relation to environmental variables in Labrador fjords, with special emphasis on Phaeocystis pouchetii

Contrasting interannual changes in phytoplankton productivity and community structure in the coastal Canadian Arctic Ocean

Picophytoplankton distribution along Khatanga Bay-shelf-continental slope environment gradients in the western Laptev Sea

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