Variable niche size of the giant mangrove whelk Terebralia palustris (Linnaeus, 1767) in a subtropical estuary

Jacqueline L. Raw, Renzo Perissinotto, Matthew S. Bird, Nelson A.F. Miranda, Nasreen Peer

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Gastropods are integral components of mangrove ecosystems as they retain primary carbon by consuming leaf litter. However, alternative primary sources may make a significant contribution toward the diets of primary consumers in subtropical mangroves due to seasonal processes that impact the availability and nutritional quality of the leaf litter. The variability of the dietary niche for the giant mangrove whelk Terebralia palustris was investigated using a stable isotope approach (δ15N and δ13C) in conjunction with gut contents analysis. The size of the isotopic niche for T. palustris was different between November (summer) and July (winter). Isotopic niches were larger in July, indicating higher dietary diversity. There was no overlap between isotopic niches of different-sized T. palustris, which indicates robust resource partitioning and an ontogenetic dietary shift. The C:N ratio of mangrove leaf litter ranged from 59.34 ± 0.9 in November to 201.66 ± 4.5 in July. The high C:N ratio observed in July could be driving the dietary diversification, if T. palustris preferably consumes more nutritious sources such as microphytobenthos. The variability in the diet of T. palustris is important when considering the ecological role of this species, as a link between mangrove primary productivity and higher trophic levels.

Original languageEnglish
Pages (from-to)265-282
Number of pages18
JournalHydrobiologia
Volume803
Issue number1
DOIs
Publication statusPublished - 1 Nov 2017
Externally publishedYes

Keywords

  • Deposit feeder
  • Isotopic niche
  • SIBER
  • Subtropical mangrove
  • Trophic niche width

ASJC Scopus subject areas

  • Aquatic Science

Fingerprint

Dive into the research topics of 'Variable niche size of the giant mangrove whelk Terebralia palustris (Linnaeus, 1767) in a subtropical estuary'. Together they form a unique fingerprint.

Cite this