¹⁵N/¹⁴N and ¹³C/¹²C in Weddell Sea Invertebrates: Implications for Feeding Diversity

Authors

Greg H. Rau, University of California, Santa Cruz
Thomas L. Hopkins, University of South FloridaFollow
Joseph J. Torres, University of South FloridaFollow

Document Type

Article

Publication Date

10-1-1991

Abstract

Biomass delta-C-13, delta-N-15, and C/N were measured for each of 29 taxa of pelagic invertebrates sampled from the Weddell Sea in March 1986. The delta-C-13 values of these animals ranged from -33.2 to -23.9 parts per thousand, and a significant negative logarithmic relationship was observed between these values and biomass C/N. This implies that the relative proportion of carbon-rich C-13-depleted lipid in these animals significantly influenced the delta-C-13 of their bulk biomass. No such relationship with C/N is evident with respect to biomass delta-N-15 where values ranged from -1.2 to +7.3 parts per thousand. This spread of values reflects a wide diversity of food sources and trophic positions among the species analyzed. Isotopic abundances within krill Euphausia superba varied with individual length, apparently reflecting dietary changes during growth. Isotope values within E superba from the Weddell Sea overlap those of krill from other Southern Ocean locations in the Scotia Sea/Drake Passage, the Ross Sea, and Prydz Bay, Antarctica,

Rights Information

This work is licensed under a Creative Commons Attribution 3.0 License.

Was this content written or created while at USF?

Yes

Citation / Publisher Attribution

Marine Ecology Progress Series, v. 77, issue 1, p. 1-6

Copyright © 1991 Inter-Research

Scholar Commons Citation

Rau, Greg H.; Hopkins, Thomas L.; and Torres, Joseph J., "¹⁵N/¹⁴N and ¹³C/¹²C in Weddell Sea Invertebrates: Implications for Feeding Diversity" (1991). Marine Science Faculty Publications. 38.
https://digitalcommons.usf.edu/msc_facpub/38