L’invasion du lançon du Pacifique en mer de Beaufort : impacts sur la morue arctique et son écosystème
|Advisor:||Fortier, Louis; Robert, Dominique|
|Abstract:||Climate change in the Arctic threatens hyper specialized polar species while favouring the invasion of boreal and temperate fish species. In the arctic marine food web, arctic cod (Boreogadus saida) is the key forage fish species. The boreal Pacific sand lance (Ammodytes hexapterus) was recently detected in southeastern Beaufort Sea (Canadian Arctic), numbering as the second most abundant ichthyoplankton species after the arctic cod in 2011. The aim of this research was to elucidate the consequences of this boreal forage fish species invasion on arctic cod during the early life stages. Potential competition was detected during the early juvenile stage but arctic cod strongly relied on big calanoid copepods while Pacific sand lance significantly selected for smaller prey. The forecasted reduction in the size of zooplankton would therefore favour sand lance over arctic cod. The interspecific competition is predicted to amplify as the abundance of sand lance in the Beaufort Sea increases.|
|Document Type:||Mémoire de maîtrise|
|Open Access Date:||20 April 2018|
|Collection:||Thèses et mémoires|
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