Book Description

Lawrence, from In the 2012 survey of Great Blue Heron colonies, Lake Saint-François, upstream, to Sept-Îles and the average number of young per clutch was the Magdalen Islands in the Gulf (Figure 1). [...] In 2011, the following colonies were sampled: Île aux Hérons and Grande-Île, in the fluvial section; Île aux Basques, in the lower estuary; and Île Manowin, in the Gulf. [...] The eggs are kept cool and sent to the laboratory to be analyzed for mercury,1 PCBs,2 organochlorine pesticides (e.g., DDT3),PBDEs4 and sometimes dioxins and furans.5 Due to fluctuations in the size and presence of colonies, it is sometimes difficult to monitor the same colony over a long period. [...] The contaminant concentrations show few concentrations of total PBDEs in Great Blue Heron eggs were on the same order of magnitude 3.5 as those of DDE and PBDE concentrations measured 3 (11) in Herring Gull eggs from (7) the Great Lakes. [...] The analysis of the main historical and emerging contaminants in Great Blue Heron egg sampling on Île aux Hérons Photo: © Annie Michel Great Blue Heron eggs provides an indication 5 BIOLOGICAL RESOURCES WATER SEDIMENTS SHORELINES USES and loss, can interfere with the functioning of the organism and pose a risk to wildlife populations.