Ice algae vs. phytoplankton: resource utilization by Arctic deep sea macroinfauna revealed through isotope labelling experiments

Anni Mäkelä (Corresponding Author), Ursula Witte, Philippe Archambault

Research output: Contribution to journalArticle

5 Citations (Scopus)
7 Downloads (Pure)

Abstract

Climate change is expected to change future Arctic marine primary production (PP) by reducing ice algal and increasing phytoplankton contributions. As most benthic macrofauna depend on PP from the euphotic zone for food, they could be vulnerable to changes in their food supply. To investigate the differential utilization of ice algae and phytoplankton food by benthic macroinfauna, isotope labelling experiments on dual 13C-15N labelled ice algae and phytoplankton were carried out at 2 sites in the Canadian Arctic. After 4 d, all animals collected at North Water Polynya (NOW; 709 m) and Lancaster Sound (LS; 794 m) exhibited isotope labelling. The C:N ratio of the macrofaunal biomass-specific uptake showed that all taxa were N-limited, and the uptake of algal C and N was often decoupled. Overall, the 2 macroinfaunal communities had different responses to the food items: in LS the accumulative biomass-specific uptake of phytoplankton C and N of all fauna was higher than uptake of ice algae, whereas in NOW ice algal C was more readily utilized. When taxa were examined individually, differences in food utilization by polychaetes, bivalves and crustaceans were site-specific, with no taxa exclusively exhibiting higher rates of ice algal uptake. The dietary plasticity observed between these sites suggests that benthic macroinfauna are able to efficiently utilize both ice algae and phytoplankton as a food source, and that the replacement of ice algae with phytoplankton food may not alter faunal feeding rates or their role in benthic nutrient cycling.
Original languageEnglish
Pages (from-to)1-18
Number of pages18
JournalMarine Ecology Progress Series
Volume572
Early online date31 May 2017
DOIs
Publication statusPublished - 31 May 2017

Fingerprint

algae
ice alga
isotope labeling
deep sea
Arctic region
ice
phytoplankton
isotope
food
experiment
primary production
polynya
euphotic zone
biomass
nutrient cycling
food supply
plasticity
crustacean
resource utilisation
labelling

Keywords

  • Climate change
  • Canadian Arctic Archipelago
  • C uptake
  • N uptake
  • Feeding experiment
  • Benthic
  • Macrofauna

Cite this

Ice algae vs. phytoplankton : resource utilization by Arctic deep sea macroinfauna revealed through isotope labelling experiments. / Mäkelä, Anni (Corresponding Author); Witte, Ursula; Archambault, Philippe.

In: Marine Ecology Progress Series, Vol. 572, 31.05.2017, p. 1-18.

Research output: Contribution to journalArticle

@article{0850364c6ee048cb96464537e68d8719,
title = "Ice algae vs. phytoplankton: resource utilization by Arctic deep sea macroinfauna revealed through isotope labelling experiments",
abstract = "Climate change is expected to change future Arctic marine primary production (PP) by reducing ice algal and increasing phytoplankton contributions. As most benthic macrofauna depend on PP from the euphotic zone for food, they could be vulnerable to changes in their food supply. To investigate the differential utilization of ice algae and phytoplankton food by benthic macroinfauna, isotope labelling experiments on dual 13C-15N labelled ice algae and phytoplankton were carried out at 2 sites in the Canadian Arctic. After 4 d, all animals collected at North Water Polynya (NOW; 709 m) and Lancaster Sound (LS; 794 m) exhibited isotope labelling. The C:N ratio of the macrofaunal biomass-specific uptake showed that all taxa were N-limited, and the uptake of algal C and N was often decoupled. Overall, the 2 macroinfaunal communities had different responses to the food items: in LS the accumulative biomass-specific uptake of phytoplankton C and N of all fauna was higher than uptake of ice algae, whereas in NOW ice algal C was more readily utilized. When taxa were examined individually, differences in food utilization by polychaetes, bivalves and crustaceans were site-specific, with no taxa exclusively exhibiting higher rates of ice algal uptake. The dietary plasticity observed between these sites suggests that benthic macroinfauna are able to efficiently utilize both ice algae and phytoplankton as a food source, and that the replacement of ice algae with phytoplankton food may not alter faunal feeding rates or their role in benthic nutrient cycling.",
keywords = "Climate change , Canadian Arctic Archipelago , C uptake, N uptake, Feeding experiment, Benthic, Macrofauna",
author = "Anni M{\"a}kel{\"a} and Ursula Witte and Philippe Archambault",
note = "We would like to thank the officers and crew of CCGS ‘Amundsen’ and the ArcticNet scientific and technical personnel for support onboard. We would also like to thank C. Grant (ISMER) and G. Kazanidis (University of Aberdeen) for field assistance, ArcticNet 2013 cruise CTD operators and L. Tr{\'e}au de Coeli and L. de Montety (ISMER) for macrofauna identification help. Additional thanks go to V. Johnston (University of Aberdeen) for general lab assistance and K. Chalut (ISMER) for sample preparation help. Work was supported by University of Aberdeen The North theme funding for A.M., Natural Environment Research Council ArcDEEP project grant NE/J023094 awarded to U.W. and ArcticNet and Green Edge funding to P.A.",
year = "2017",
month = "5",
day = "31",
doi = "10.3354/meps12157",
language = "English",
volume = "572",
pages = "1--18",
journal = "Marine Ecology Progress Series",
issn = "0171-8630",
publisher = "Inter-Research",

}

TY - JOUR

T1 - Ice algae vs. phytoplankton

T2 - resource utilization by Arctic deep sea macroinfauna revealed through isotope labelling experiments

AU - Mäkelä, Anni

AU - Witte, Ursula

AU - Archambault, Philippe

N1 - We would like to thank the officers and crew of CCGS ‘Amundsen’ and the ArcticNet scientific and technical personnel for support onboard. We would also like to thank C. Grant (ISMER) and G. Kazanidis (University of Aberdeen) for field assistance, ArcticNet 2013 cruise CTD operators and L. Tréau de Coeli and L. de Montety (ISMER) for macrofauna identification help. Additional thanks go to V. Johnston (University of Aberdeen) for general lab assistance and K. Chalut (ISMER) for sample preparation help. Work was supported by University of Aberdeen The North theme funding for A.M., Natural Environment Research Council ArcDEEP project grant NE/J023094 awarded to U.W. and ArcticNet and Green Edge funding to P.A.

PY - 2017/5/31

Y1 - 2017/5/31

N2 - Climate change is expected to change future Arctic marine primary production (PP) by reducing ice algal and increasing phytoplankton contributions. As most benthic macrofauna depend on PP from the euphotic zone for food, they could be vulnerable to changes in their food supply. To investigate the differential utilization of ice algae and phytoplankton food by benthic macroinfauna, isotope labelling experiments on dual 13C-15N labelled ice algae and phytoplankton were carried out at 2 sites in the Canadian Arctic. After 4 d, all animals collected at North Water Polynya (NOW; 709 m) and Lancaster Sound (LS; 794 m) exhibited isotope labelling. The C:N ratio of the macrofaunal biomass-specific uptake showed that all taxa were N-limited, and the uptake of algal C and N was often decoupled. Overall, the 2 macroinfaunal communities had different responses to the food items: in LS the accumulative biomass-specific uptake of phytoplankton C and N of all fauna was higher than uptake of ice algae, whereas in NOW ice algal C was more readily utilized. When taxa were examined individually, differences in food utilization by polychaetes, bivalves and crustaceans were site-specific, with no taxa exclusively exhibiting higher rates of ice algal uptake. The dietary plasticity observed between these sites suggests that benthic macroinfauna are able to efficiently utilize both ice algae and phytoplankton as a food source, and that the replacement of ice algae with phytoplankton food may not alter faunal feeding rates or their role in benthic nutrient cycling.

AB - Climate change is expected to change future Arctic marine primary production (PP) by reducing ice algal and increasing phytoplankton contributions. As most benthic macrofauna depend on PP from the euphotic zone for food, they could be vulnerable to changes in their food supply. To investigate the differential utilization of ice algae and phytoplankton food by benthic macroinfauna, isotope labelling experiments on dual 13C-15N labelled ice algae and phytoplankton were carried out at 2 sites in the Canadian Arctic. After 4 d, all animals collected at North Water Polynya (NOW; 709 m) and Lancaster Sound (LS; 794 m) exhibited isotope labelling. The C:N ratio of the macrofaunal biomass-specific uptake showed that all taxa were N-limited, and the uptake of algal C and N was often decoupled. Overall, the 2 macroinfaunal communities had different responses to the food items: in LS the accumulative biomass-specific uptake of phytoplankton C and N of all fauna was higher than uptake of ice algae, whereas in NOW ice algal C was more readily utilized. When taxa were examined individually, differences in food utilization by polychaetes, bivalves and crustaceans were site-specific, with no taxa exclusively exhibiting higher rates of ice algal uptake. The dietary plasticity observed between these sites suggests that benthic macroinfauna are able to efficiently utilize both ice algae and phytoplankton as a food source, and that the replacement of ice algae with phytoplankton food may not alter faunal feeding rates or their role in benthic nutrient cycling.

KW - Climate change

KW - Canadian Arctic Archipelago

KW - C uptake

KW - N uptake

KW - Feeding experiment

KW - Benthic

KW - Macrofauna

U2 - 10.3354/meps12157

DO - 10.3354/meps12157

M3 - Article

VL - 572

SP - 1

EP - 18

JO - Marine Ecology Progress Series

JF - Marine Ecology Progress Series

SN - 0171-8630

ER -