Seasonality of zooplankton communities in the Hudson Bay system
Bibliographic Data
| ID | 19568486 |
|---|---|
| Authors | Sarah Schembri (0000-0002-8174-2051, Université Laval), Caroline Bouchard (0000-0002-5030-9378, Grønlands Naturinstitut), Tommy Pontbriand (Fisheries and Oceans Canada), Frédéric Maps (0000-0001-7115-2464, Université Laval) |
| Year | 2023 |
| Volume | 11 |
| Issue | 1 |
| Publication date | 2023-06-28 |
| Open Access | Yes |
| Type | ARTICLE |
| Venue | Elementa Science of the Anthropocene (JOURNAL) |
| Journal identifiers | ISSN: 2325-1026 • E-ISSN: 2325-1026 |
| Publisher | University of California Press (PUBLISHER • US) |
| DOI | 10.1525/elementa.2022.00113 |
| OpenAlex | W4382601704 |
| Language | EN |
| References cited | 67 |
The strong seasonality of sub-Arctic seas needs to be considered to understand their ecosystems. The Hudson Bay system undergoes strong seasonal changes in 1) sea ice conditions, alternating between complete ice cover in winter and open water in summer; 2) river discharge, which peaks in the spring and influences the stratification of the bay; and 3) surface circulation that consists of a weak double gyre system in spring and summer and a cyclonic system in the autumn. Recent studies that included data collected during spring have shown that the annual primary productivity in the Hudson Bay system is higher than previously reported. Similarly, the regional zooplankton assemblages have been studied mostly in late summer, possibly leading to an underestimation of the annual secondary production. Here, we use data collected during five one to six week-long expeditions of the CCGS Amundsen in the Hudson Bay system between 2005 and 2018 to describe the seasonality in mesozooplankton assemblages and investigate how it depends on environmental variables. In general, small pan-Arctic and boreal copepods such as Microcalanus spp., Oithona similis and Pseudocalanus spp. dominated the assemblages. From spring to summer, the relative abundance of the Arctic-adapted Calanus hyperboreus and Calanus glacialis decreased, while the proportion of the boreal Pseudocalanus spp. and Acartia spp. increased. The day of the year and the ice break-up date explained most of the variation in mesozooplankton assemblages. Physical processes explained most of the species distribution in spring, while the lack of lipid-rich zooplankton species in late summer and autumn, especially in coastal regions, suggests some top-down control. This lack of lipid-rich zooplankton late in the season contrasts with other seasonally ice-covered seas. More data are needed to fully understand the implications of these dynamics under climate change, but this study establishes a baseline against which future changes can be compared
Acartia · Arctic · Bay · Biology · Boreal · Calanus · Copepod · Crustacean · Ocean gyre · Phytoplankton · Sea ice · Seasonality · Spring bloom · Subtropics · Zooplankton · Arctic and Antarctic ice dynamics · Environmental Science · Marine and coastal ecosystems · Marine and environmental studies · Ecology · Geology · Oceanography
The ice factory of Hudson Bay
Climate change and sea ice
Climate control of sea-ice edge phytoplankton blooms in the Hudson Bay system
A baseline evaluation of oceanographic and sea ice conditions in the Hudson Bay Complex during 2016–2018
Environmental drivers of spring primary production in Hudson Bay
Arctic cod ( Boreogadus saida ) hatching in the Hudson Bay system
Zooplankton assemblages along the North American Arctic
| Highly cited | No |
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