Hypotheses
General
hypothesis: Global warming will cause a retraction of endemic Arctic
copepod species
range and will extend the range northward of species from lower latitudes.
Despite SW transport of low
salinity water, the optimal population growth conditions will shift northward
for both Arctic and NWA populations resulting in a concomitant northward increase in NWA
species and shrinkage of Arctic species range.
H10: Boreal species in the NWA, Calanus finmarchicus and Pseudocalanus newmani and P.
moultoni will expand into Arctic
Ocean despite limitations due to the mean southwest
advective flow.
H20: Arctic species,
Calanus glacialis and C. hyperboreus, abundance will decrease in the NWA and their ranges will be contracted within the Arctic Ocean
itself. Alternatively, (H2a) abundance of these species will increase in the NWA due to increased
Arctic outflow.
H30: Calanus marshallae
will expand into the Arctic and be carried through the Canadian archipelago into the NWA
H40: The warm water NWA
species, Centropages typicus and Centropages hamatus will expand northward increasing abundance the Labrador Sea and Canadian
archipelago. The rate of expansion will be slower for Centropages hamatus which lays bottom
resting eggs.
H50: The mechanisms
controlling biogeographic patterns in copepod species can be understood by modeling the evolution of optimal life history traits for
given environmental conditions and climate scenarios.