B1 Journal article
Cardiac SERCA activity in sockeye salmon populations: an adaptive response to migration conditions

List of Authors: Katja Anttila, Anthony P. Farrell, David A. Patterson, Scott G. Hinch, Erika J. Eliason
Publication year: 2019
Journal: Canadian Journal of Fisheries and Aquatic Sciences
Volume number: 76
Issue number: 1
eISSN: 1205-7533


We show that cardiac sarco(endo)plasmic reticulum Ca2+-ATPase (SERCA) activity differs considerably among sockeye salmon (Oncorhynchus nerka)
populations. Variability in SERCA activity was significantly correlated
with elevation gain and temperature during migration, as well as
maximum cardiac stroke volume. Furthermore, because SERCA activity was
not lowered during the spawning migration, this aspect of the cardiac
contraction machinery is apparently spared during the senescence of
these semelparous salmon, likely because it is essential for these fish
to complete spawning. Only when spawning had been completed was there a
significant reduction in SERCA activity, which was detectable in males
at a 25 °C and in females at a 15 °C assay temperature. Hence, we
propose that migration conditions act as a strong selective force that
has resulted in local adaptation of myocardial SERCA activity among
sockeye salmon populations.

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Last updated on 2019-20-07 at 07:28