Past President's Address: Protists of the Mesopelagic and a Bit on the Long Path to the Deep Sea.


Journal

The Journal of eukaryotic microbiology
ISSN: 1550-7408
Titre abrégé: J Eukaryot Microbiol
Pays: United States
ID NLM: 9306405

Informations de publication

Date de publication:
11 2019
Historique:
received: 09 04 2019
revised: 08 05 2019
accepted: 25 05 2019
pubmed: 6 6 2019
medline: 12 6 2020
entrez: 6 6 2019
Statut: ppublish

Résumé

The deep sea has long been a mysterious and attractive habitat for protistologists. However, logistical difficulties severely limit sampling opportunities. Consequently, our knowledge of the protists in the deep sea, (arguably the largest habitat on earth), is relatively sparse. Here, we present a unique time-series concerning three different protist taxa that share only the characteristics of being relatively large, robust to sampling, and easily identifiable to species level using light microscopy: tintinnid ciliates, phaeogromid cercozoans (e.g. Challengerids) and amphisolenid dinoflagellates. We sampled a near-shore deep water site in the N.W. Mediterranean Sea at 250 m depth over a 2-yr period at approximately weekly intervals from January 2017 to December 2018. To our knowledge, no previous studies have employed sampling on a similar time scale. We found taxa that appear to be restricted to deep waters, distinct seasonal patterns of abundance in some taxa, and in others nonseasonal successional patterns. Based on data from sampling following a flash flood event, the Challengerid population appeared to respond positively to a pulse of terrigenous input. Some of the distinct mesopelagic tintinnid ciliates and amphisolinid dinoflagellates were also found in two samples from the North Atlantic mesopelagic gathered from near the Azores Islands in September 2018. We conclude that there are a variety of protist taxa endemic to the mesopelagic, that the populations are dynamic, and they may be widely distributed in the deep waters of the world ocean.

Identifiants

pubmed: 31166639
doi: 10.1111/jeu.12744
doi:

Types de publication

Address Journal Article Research Support, Non-U.S. Gov't

Langues

eng

Sous-ensembles de citation

IM

Pagination

966-980

Informations de copyright

© 2019 International Society of Protistologists.

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Auteurs

John R Dolan (JR)

Laboratoire d'Océanographie de Villefranche-sur-Mer, Sorbonne Université, CNRS UMR 7093, Station Zoologique, 06230, Villefranche-sur-Mer, France.

Maria Ciobanu (M)

Laboratoire d'Océanographie de Villefranche-sur-Mer, Sorbonne Université, CNRS UMR 7093, Station Zoologique, 06230, Villefranche-sur-Mer, France.

Laurent Coppola (L)

Laboratoire d'Océanographie de Villefranche-sur-Mer, Sorbonne Université, CNRS UMR 7093, Station Zoologique, 06230, Villefranche-sur-Mer, France.

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