Cold and wet: Diatoms dominate the phytoplankton community during a year of anomalous weather in a Great Lakes estuary

A tale of two blooms: do ecological paradigms for algal bloom success and succession require revisiting?

“…Yet, there are few reports concerning summer diatom blooms (other than those by Hartig) in Lake Erie. Beyond the Great Lakes, Mancuso et al (2021) reported diatoms, not cyanobacteria, were the dominant planktonic taxa throughout April- October in Muskegon Estuary (US), with summer temperatures at an average of ~ 23° C. Yet, this was an abnormally cold and wet summer, suggesting shifts in lake physiochemistry were responsible for this abnormal event. Another long-term monitoring study suggested climate- related variables such as warmer winters and variable ice cover have crucial effects on spring diatom dynamics in Saidenbach Reservoir (Germany) ( Horn et al, 2011 ), noting these conditions can confound consequences of changing nutrient loads.…”

Recurringly Hypoxic: Bottom Water Oxygen Depletion Is Linked to Temperature and Precipitation in a Great Lakes Estuary

“…Heat maps were created using daily averaged water temperatures and DO concentrations at 2, 4, 6, 8, 10, and 11 m and 2, 5, 8, and 11 m, respectively. Due to the MLO's central location, MLO data observed in the heat maps can be used as a proxy to understand hypoxia dynamics throughout Muskegon Lake as a whole [10,37]. Each heat map was scaled to the dates of the earliest MLO deployment and the latest MLO retrieval throughout the decade.…”

“…However, there was no discernable trend in whether Muskegon Lake enced increases or decreases in hypoxia over the decade, as hypoxia fluctuated co ably from year to year based on the environmental conditions during any particula The number of hypoxic days and the severity of hypoxia varied greatly througho decade as differing winter and spring precipitation likely led to differing nutrie organic matter inputs to Muskegon Lake, which may ultimately drive hypoxia. I several earlier studies have revealed that Muskegon Lake is a net sink for both ino nutrients and organic matter received from the Muskegon River, which helps expla riverine, nutrient-fueled excess phytoplankton production and organic matter-fuel piration within the lake may contribute to variable bottom water hypoxia [6,7,28,37 Therefore, eutrophication was a major issue during dry and severely hypoxic years residence time within Muskegon Lake lengthened. Observed changes in increas poxia severity were correlated with warmer air and surface water temperatures, The shading between years reflects the hypoxia severity index, where darker blue years were mildly hypoxic while darker red years were severely hypoxic.…”

“…The number of hypoxic days and the severity of hypoxia varied greatly throughout the decade as differing winter and spring precipitation likely led to differing nutrient and organic matter inputs to Muskegon Lake, which may ultimately drive hypoxia. Indeed, several earlier studies have revealed that Muskegon Lake is a net sink for both inorganic nutrients and organic matter received from the Muskegon River, which helps explain how riverine, nutrientfueled excess phytoplankton production and organic matter-fueled respiration within the lake may contribute to variable bottom water hypoxia [6,7,28,37,50,51]. Therefore, eutrophication was a major issue during dry and severely hypoxic years as the residence time within Muskegon Lake lengthened.…”

Phytoplankton Dynamics and Its Relation to Physicochemical Parameters in the Dry Season of Maninjau Lake, West Sumatra, Indonesia

“…Bacillariophyceae is found in almost every sampling location with high nutrient levels, where the concentrations of TN and TP are hypereutrophic. Bacillariophyceae or diatom assemblages can live in any condition, even in extreme conditions, and adapt quickly (Mancuso et al, 2021). Cyanobacteria, which act as the primary producers, are predominant in surface waters but fall dramatically in summer and autumn in deeper waters.…”