Abstract
In order to gain insight into the dynamics of the Hudson Bay ecosystem as well as past and future states, an ecosystem model was created using a static Ecopath model to represent the present day ecosystem in Hudson Bay. Simulations of past and future ecosystem states were used to gain insight to key trophic linkages within the system, with focus on marine mammal populations. The past ecosystem was simulated by increasing ice algae and removing killer whales (Orcinus orca) from the system, which led to an increased biomass of all other groups within the model, excluding pelagic producers. Future states of Hudson Bay are presented in three scenarios representing various degrees of reported and predicted ecosystem changes including climate change and increased hunting pressure. All future scenarios show an overall decrease in species biomass, although some species are positively impacted by the changes in the system. Model simulations suggest bottom up forcing of ice algae is an important factor driving marine mammal biomass.
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Notes
- 1.
Prior to 1981 statistics for Nunavut were combine with Northwest Territories.
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Appendix
Appendix
Fish groupings for the Hudson Bay ecosystem modeled after Stewart and Lockhart (2005). Under the classification, only species found within Hudson and James Bays which spend at least part of their life in areas where they would be available to marine mammals were included. In Stewart and Lockhart (2005) these are classified as; Marine, Brackish, Estuarine, and some Diadromous.
Atlantic Salmon | Â |
Atlantic salmon | Salmo salar |
Arctic Char | Â |
Arctic Char | Salvelinus alpines |
Capelin | Â |
Capeli | Mallotus villosus |
Gadiformes | Â |
Arctic cod | Boreogadus saida |
Greenland cod | Gadus ogac |
Polar cod | Arctogadus glacialis |
Other Brackish Water Fish | Â |
Arctic shanny | Stichaeus punctatus |
Canadian plaice | Hippoglossoides platessoides |
Slender eelblenny | Lumpenus fabricii |
Other Marine Fish | Â |
Alligator poacher | Leptagonus decagonus |
Atlantic alligatorfish | Ulcina olriki |
Atlantic Herring | Clupea harengus |
Atlantic spiny lumpsucker | Eumicrotremus spinosus |
Banded gunnel | Pholis fasciata |
Daubed shanny | Leptoclinus maculatus |
Dusky snailfish | Liparis gibbus |
Fourline snakeblenny | Eumesogrammus praecisus |
Gelatinous snailfish | Liparis fabricii |
Kelp snailfish | Liparis tunicatus |
Leatherfin lumpsucker | Eumicrotremus derjugini |
Lumpfish | Cyclopterus lumpus |
Sea tadpole | Careproctus reinhardti |
Stout eelblenny | Anisarchus medius |
Other Salmon | Â |
Arctic Char | Salvelinus alpinus |
Brook trout | Salvelinus fontinalis |
Lake cisco | Coregonus artedi |
Lake whitefish | Coregonus clupeaformis |
Round whitefish | Prosopium cylindraceum |
Sandlance | Â |
Northern sand lance | Ammodytes dubius |
Stout sand lance | Ammodytes hexapterus |
Sculpins/Zoarcids | Â |
Arctic eelpout | Lycodes reticulatus |
Arctic sculpin | Myoxocephalus scorpiodes |
Arctic staghorn | Gymnocanthus tricuspis |
Fish doctor | Gymnelus viridis |
Fourhorn sculpin | Myoxocephalus quadricornis |
Moustache sculpin | Triglops murrayi |
Pale eelpout | Lycodes pallidus |
Ribbed sculpin | Triglops pingelli |
Shorthorn sculpin | Myoxocephalus scorpius |
Spatulate sculpin | Icelus spatula |
Twohorn sculpin | Icelus bicornis |
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Hoover, C. (2010). Hudson Bay Ecosystem: Past, Present, and Future. In: Ferguson, S.H., Loseto, L.L., Mallory, M.L. (eds) A Little Less Arctic. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-9121-5_11
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