Fig. 1. Continuous measurements of gastric pH (black line) and temperature
(gray line) in a free-swimming adult female leopard shark (Triakis semifasciata),
TL=150 cm. Data were obtained using an autonomous pH data-logger. a)
Arrow points to time of feeding, when squid was consumed at 1% of the shark's
body weight (% BW). Note the initial increase in gastric pH followed by a rapid
decline in pH (i) and consequently a more gradual decrease (ii) indicative of a
change in acid secretion rate. b) Arrow points to time of feeding when shark ate a
meal of Capelin (Mallotus villosus) at 1% BW. Note the absence of a rapid
decline in gastric pH. Data taken from