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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Dynamic change in an ocean desert: Microbial diversity and trophic transfer along the 110 °E meridional in the Indian Ocean
Deep-Sea Research Part II: Topical Studies in Oceanography, Volume 201, Article 105097, Year 2022
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Description
The eastern Indian Ocean is among the most oligotrophic regions in the world and has been described as an ocean desert. Limited information exists on microbial community profiles from marker gene data, and an open question in this system is how energy is transported from the base of the food web to higher trophic levels. Here we show that, along a 3300 km long transect in the ultra-oligotrophic eastern Indian Ocean, both alpha and beta diversity metrics for prokaryotic and eukaryotic trophic groups revealed remarkably strong latitudinal trends. The latitudinal Shannon diversity pattern for autotrophic eukaryotes furthermore aligned with the isotopic δ13C ratios of particulate organic carbon, fractionated zooplankton and hand-picked fish larvae, suggesting a close trophic linkage between autotrophic eukaryotes and higher trophic levels. Our data also showed an increasing contribution of eukaryotic mixotrophs and a high contribution of heterotrophic eukaryotes towards warmer waters. These findings highlight that not only the recycling of organic matter via bacterial regeneration is important in this system but that mixo- and heterotrophic eukaryotes play a major role in redistributing energy within the marine food web of these oligotrophic waters. Our data provide a baseline to understand how environmental changes such as warming surface waters might impact the open-ocean food web in this oligotrophic basin. © 2022
Authors & Co-Authors
Hörstmann, Cora
Germany, Bremerhaven
Alfred-wegener-institut Helmholtz-zentrum Für Polar- Und Meeresforschung
Landry, Michael R.
United States, La Jolla
University of California, San Diego
Beckley, Lynnath E.
Australia, Perth
Murdoch University
Antoine, David
Australia, Perth
Curtin University
Ostrowski, Martin
Australia, Sydney
University of Technology Sydney
Statistics
Citations: 4
Authors: 5
Affiliations: 9
Identifiers
Doi:
10.1016/j.dsr2.2022.105097
ISSN:
09670645
Research Areas
Environmental
Food Security
Genetics And Genomics