Stable carbon and oxygen isotope fractionation in bivalve (Placopecten magellanicus) larval aragonite

Experimental validation of environmental controls on the δ13C of Arctica islandica (ocean quahog) shell carbonate

“…Owen et al (2008) found that for the larval stage of the scallop Placopecten magellanicus cultured at various DIC conditions, shell aragonite d 13 C values were lower than predicted equilibrium values by 1.8 ± 0.2&, in this case presuming that d 13 C DIC and d 13 C HCO À 3 were roughly equivalent (Romanek et al, 1992;Fig. 8).…”

“…Individual values, as well as averages from adults and juveniles are plotted relative to the experimentally determined relationship between inorganic aragonite and bicarbonate (Romanek et al, 1992). Data from Owen et al (2008) are presented for comparison of biologically precipitated carbonate; however, in the case of the Owen et al (2008) data, shell values are plotted against total DIC. of marine mollusks have documented significantly higher %C M (e.g.…”

Seasonal Movement Patterns of the Bigfin Reef Squid Sepioteuthis lessoniana Predicted Using Statolith δ18O Values

“…The seasonal and vertical migration of squid species has been described in the literatures (Bazzino et al, 2010;Argüelles et al, 2012;Yamaguchi et al, 2019); this behavior was also observed in our study. Interpreting time-series data in squids is generally more difficult than interpreting data obtained from bivalves (e.g., Nakashima et al, 2004;Owen et al, 2008;Nishida et al, 2015) because the squid species move freely, unlike bivalves. We converted the measured statolith δ 18 O values to the deduced temperature and cross-matched them with the seasonal and depth changes in the seawater temperatures to estimate the probability of the geographical distribution of S. lessoniana by using a procedure derived from a widely used method to study fish migration (involving the use of otolith δ 18 O values; Thorrold et al, 1997;Weidel et al, 2007;Shiao et al, 2014).…”

Isotopic composition of Conomurex fasciatus shells as an environmental proxy for the Red Sea

“…9). Changes in d 13 C S values have been linked to large salinity differences and changes in d 13 C DIC due to freshwater input (Mook and Tan, 1991;Gillikin et al, 2006;McConnaughey and Gillikin, 2008;Owen et al, 2008). Freshwater input is minimal in the study area (36.9e38.8 psu) due to the lack of river discharge and the low levels of precipitation.…”

“…Endogenous processes such as age, growth, reproduction, and environmental factors such as food availability and temperature can influence the animal activity and shell isotopic record (Sch€ one, 2008). d 13 C from shell carbonates can be complicated because of the multiple sources of carbon.…”