Biodiversity, community structure and ecosystem function on kelp and wood falls in the norwegian deep sea

Rob P. Harbour, Craig R. Smith, Cornelia Simon-Nutbrown, Marta Cecchetto, Emily Young, Caterina Coral, Andrew K. Sweetman

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Fjordic systems in temperate and Arctic regions often feature extensive kelp forests at their shallow coastal margins as well as extensive terrestrial forests. Detrital export from these shallow-water and terrestrial ecosystems is an important source of carbon for deep-sea communities in the form of kelp and wood falls. Benthic landers with experimental substrates (wood blocks and kelp parcels) were deployed for 10 mo at a depth of 530 m in a deep Norwegian fjord to investigate and compare macro- A nd megabenthic community structure, biodiversity and ecosystem functioning on kelp and wood falls. Results revealed that while wood and kelp falls can support a similar number of species and abundance of fauna, they support significantly different faunal communities. Biomass and secondary production on both wood and kelp substrates were significantly greater than in the control samples. Secondary production estimates were similar or higher than those reported from soft-sediment ecosystems at shallower European marine sites. Biological trait analysis showed that macrofaunal assemblages were distinct between the kelp and wood, providing evidence for differences in ecosystem function between the substrates. This case study from a deep-sea fjord in Norway provides clear evidence that while wood and kelp organic falls can support similar abundances of fauna, the associated benthic biodiversity, community structure and ecosystem functioning can be dramatically different between these substrates. The work presented here aims to provide information that is useful in assessing the extent of anthropogenic impacts on deep fjord ecosystems with respect to informing future conservation and management strategies.

Original languageEnglish
Pages (from-to)73-91
Number of pages19
JournalMarine Ecology Progress Series
Volume657
DOIs
Publication statusPublished - 7 Jan 2021

Keywords

  • Benthic lander
  • Deep sea
  • Fjord
  • Kelp
  • Organic falls
  • Wood

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Aquatic Science
  • Ecology

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