Trophic Relationships between Two Gastropods and Seaweeds in Subtropical Rocky Reefs Based on Stable Isotope Analyses

Alejandra Piñón-Gimate, Mercedes M. Gómez-Valdez, Alejandra Mazariegos-Villarreal, Elisa Serviere-Zaragoza

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

The wavy turban snail Megastraea undosa and keyhole limpet Megathura crenulata, two gastropods with commercial importance, five macroalgae, and one seagrass were collected at Bahía Tortugas, Baja California Sur, Mexico, for analysis of stable isotope ratios. The δ13C and δ15N isotope signatures obtained from gastropod muscle tissue were different between the two gastropods. Isotope signatures of M. crenulata had more enriched δ13C (-14.35‰ ± 1.66‰) and δ15N (15.48‰ ± 0.67‰) than M. undosa isotope signatures for δ13C (-17.59‰ ± 2.43‰) and δ15N (12.42‰ ± 0.61‰). Seaweed isotope signals varied from -21.8‰ to -11.4‰ for δ13C and 9.3‰ to 10.9‰ for δ15N. The δ13C of detritus was -7.93 and of tunicates was -9.3‰ and the δ15N of detritus was 12.4 and of tunicates was 8.1‰. Mixing models showed that the greatest contribution to the diet of M. undosa was from Prionitis cornea and Gelidium robustum. For M. crenulata, it was from detritus and Macrocystis pyrifera. A higher trophic position (3.1) was observed for M. crenulata than M. undosa (2.3), which clearly reflected the differences in their feeding habits: M. undosa is a herbivore and M. crenulata is an omnivore.
Original languageAmerican English
Pages (from-to)191-197
Number of pages171
JournalJournal of Shellfish Research
DOIs
StatePublished - 1 Apr 2016
Externally publishedYes

Fingerprint Dive into the research topics of 'Trophic Relationships between Two Gastropods and Seaweeds in Subtropical Rocky Reefs Based on Stable Isotope Analyses'. Together they form a unique fingerprint.

  • Cite this