Marine Biology

, Volume 160, Issue 7, pp 1681–1695

Evidence for benthic primary production support of an apex predator–dominated coral reef food web

  • Anna K. Hilting
  • Carolyn A. Currin
  • Randall K. Kosaki
Original Paper

DOI: 10.1007/s00227-013-2220-x

Cite this article as:
Hilting, A.K., Currin, C.A. & Kosaki, R.K. Mar Biol (2013) 160: 1681. doi:10.1007/s00227-013-2220-x

Abstract

Five hundred and ninety-nine primary producers and consumers in the Papahānaumokuākea Marine National Monument (PMNM) (22°N–30°N, 160°W–180°W) were sampled for carbon and nitrogen stable isotope composition to elucidate trophic relationships in a relatively unimpacted, apex predator–dominated coral reef ecosystem. A one-isotope (δ13C), two-source (phytoplankton and benthic primary production) mixing model provided evidence for an average minimum benthic primary production contribution of 65 % to consumer production. Primary producer δ15N values ranged from −1.6 to 8.0 ‰ with an average (2.1 ‰) consistent with a prevalence of N2 fixation. Consumer group δ15N means ranged from 6.6 ‰ (herbivore) to 12.1 ‰ (Galeocerdo cuvier), and differences between consumer group δ15N values suggest an average trophic enrichment factor of 1.8 ‰ Δ15N. Based on relative δ15N values, the larger G. cuvier may feed at a trophic position above other apex predators. The results provide baseline data for investigating the trophic ecology of healthy coral reef ecosystems.

Abbreviations

BMA

Benthic macroalgae

BMI

Benthic microalgae

C

Carbon

FL

Fork length

FFS

French Frigate Shoals

HCl

Hydrochloric acid

IRMS

Isotope ratio mass spectrometer

Lu

Ludox

PMNM

Papahānaumokuākea Marine National Monument

N

Nitrogen

SD

Standard deviation

SI

Stable isotope

TEF

Trophic enrichment factor

TL

Total length

TP

Trophic position

VM

Vertical migration

Supplementary material

227_2013_2220_MOESM1_ESM.xls (205 kb)
Supplementary material 1 (XLS 205 kb)

Copyright information

© Springer-Verlag Berlin Heidelberg (outside the USA) 2013

Authors and Affiliations

  • Anna K. Hilting
    • 1
  • Carolyn A. Currin
    • 1
  • Randall K. Kosaki
    • 2
  1. 1.NOAA NOS NCCOS CCFHRBeaufortUSA
  2. 2.NOAA NOS Papahānaumokuākea Marine National MonumentHonoluluUSA