Trophic and growth baseline of dominant subtidal gastropods in contrasting subtropical marine environments

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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  • Billy K.Y. Kwan
  • S.G. Cheung
  • Alice K.Y. Chan
  • Paul K.S. Shin


Original languageEnglish
Pages (from-to)396-405
Journal / PublicationMarine Pollution Bulletin
Online published21 Dec 2017
Publication statusPublished - Feb 2018


Using 13C/12C, 15N/14N and 18O/16O isotopes, the trophic relationship and growth estimation were analyzed in gastropods Nassarius siquijorensis, Murex trapa and Turritella bacillum and their potential food sources and predators in summer and winter from estuarine and oceanic environments in subtropical Hong Kong. Results of δ13C and δ15N values and isotopic mixing model revealed N. siquijorensis and M. trapa were one trophic level higher than T. bacillum, in which its main food source was particulate organic matter (POM) whereas N. siquijorensis largely consumed POM and polychaetes and M. trapa also preyed on other gastropods. Crabs were the major predator of gastropods. Organisms collected from oceanic waters were more 13C enriched than from estuarine waters, reflecting different carbon food sources from marine or terrestrial origin. The δ18O profile from shell carbonate suggested these gastropods were one to two years old. T. bacillum exhibited faster summer growth than the other two species.

Research Area(s)

  • Age estimate, Gastropoda, Shell growth, Stable isotope analysis, Subtropics, Trophic relationship

Citation Format(s)