Report

Satellite Tagging and Cardiac Physiology Reveal Niche Expansion in Salmon Sharks

+ See all authors and affiliations

Science  07 Oct 2005:
Vol. 310, Issue 5745, pp. 104-106
DOI: 10.1126/science.1114616

You are currently viewing the abstract.

View Full Text

Abstract

Shark populations are declining globally, yet the movements and habitats of most species are unknown. We used a satellite tag attached to the dorsal fin to track salmon sharks (Lamna ditropis) for up to 3.2 years. Here we show that salmon sharks have a subarctic-to-subtropical niche, ranging from 2° to 24°C, and they spend winter periods in waters as cold as 2° to 8°C. Functional assays and protein gels reveal that the expression of excitation-contraction coupling proteins is enhanced in salmon shark hearts, which may underlie the shark's ability to maintain heart function at cold temperatures and their niche expansion into subarctic seas.

    View Full Text

    Related Content