A close to 20 years monitoring of the phytoplankton and zooplankton community of the St-Lawrence estuary and Gulf shows that their global state remained fairly stable for the 2013-2017 period. If the biomass and the composition of the phytoplankton are highly variable, they did not show signs of anomalies for the most recent period. On the other side, zooplankton biomasses decreased slightly and its composition is changing, which could have impacts on the food web. On the toxic algae bloom side, there was a slight decrease in the last four years.
The summary indicator demonstrates that the temperature of the three levels of the St-Lawrence (surface, intermediate, deep) as well as the hypoxia and acidity conditions of the estuary remain at the intermediate level for the 2013-2017 period. However, a deteriorating trend of the general state was recorded from 2008 to 2012 and was mostly due to the high temperature of the deep waters which started to climb in 1915. The global tendency is also due to the decline of dissolved oxygen and the level of acidity in the St-Lawrence estuary, who both reached new records.
This fact sheet provides an overview of the evolving status of invasive alien plant species (IAPS) in the St. Lawrence wetlands from 2008 to 2014. The present status of the St. Lawrence regarding IAPS invasion is considered intermediate. The overall IAPS trend, assessed across three-year intervals between data inventories, is considered stable. By species and sectors however there are variations.
Cette fiche résume les informations disponibles sur la population de bar rayé du fleuve Saint-Laurent en décrivant brièvement le contexte historique, le statut de cette population sur le plan légal ainsi que les différentes activités réalisées pour procéder au suivi du rétablissement et à l’acquisition de connaissances.