Deep-Sea Research Part II: Topical Studies in Oceanography, volume 208, pages 105266

Diet of deep-sea holothurians in theVolcanologists Massif, Bering sea, as inferred from stable isotope and fatty acid analyses

Rodkina S A ¹

Kiyashko S I ¹

MORDUKHOVICH VLADIMIR V. ^{1, 2}

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A.V. Zhirmunsky National Scientific Center of Marine Biology, Far Eastern Branch, Russian Academy of Sciences, Vladivostok, 690041, Russia |

Far Eastern Federal University, Vladivostok, 690922, Russia |

Publication type: Journal Article

Publication date: 2023-04-01

Elsevier

Journal: Deep-Sea Research Part II: Topical Studies in Oceanography

Quartile SCImago

Quartile WOS

Impact factor: 3

ISSN: 09670645

DOI: 10.1016/j.dsr2.2023.105266

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Oceanography

Abstract

Holothurians are one of the key components of the deep-sea megabenthos, often forming significant aggregations with high abundance and biomass. The crucial factors determining the pattern of their spatial distribution might be their food strategies, as well as the quantity and quality of available food. Using the set of trophic markers (analysis of fatty acid (FA) composition and stable nitrogen and carbon isotope signatures), we studied the trophic preferences of four common species of deep-sea holothurians (Paelopatides sp., Pannychia henrici, Psolidium sp., and Scotoplanes kurilensis) inhabiting the Volcanologists Massif, Bering Sea, at depths from 984 m to 3395 m. The δ13С values in tissues of all four species varied slightly (from −16.2 to −16.6‰) and were significantly higher than those in sediment organic matter (SOM) (on average, −21.5‰), which indicates the use of organic matter of the same origin by all species. The δ15N values (10.1–12.9‰) were also significantly higher than in SOM (on average, 4.4‰). The lowest average δ15N value was recorded for the deepest-dwelling species (Scotoplanes kurilensis), and the highest value from the shallowest-dwelling ones (Psolidium sp.). All the species differed significantly in FA composition. Psolidium sp. was distinguished by the highest saturated FA content (45.5%) and the lowest polyunsaturated FA (PUFA) content (18.7%). In the rest of the species, PUFAs dominated (>35%). The ratios of major PUFAs varied among the four species studied but all holothurians species were rich in phytoplankton derived FA suggesting tight trophic coupling to phytodetritus. However, for Psolidium sp., bacteria could constitute a substantial portion in the diet. The high level of 20:4n-6 might indicate a significant contribution of protozoans to the diet of Pannychia henrici. Paelopatides sp. and Scotoplanes kurilensis were characterized by a high level of 20:5n-3 and a high value of the 20:5n-3/20:4n-6 ratio, which indicates the predominance of fresh phytodetritus in their diet. The high level of primary production in the upper layers of the Bering Sea provides the high quality of the sedimentary OM and food supply of deposit feeders even at the greatest depths.

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Deep-Sea Research Part II: Topical Studies in Oceanography	Deep-Sea Research Part II: Topical Studies in Oceanography, 1, 25% Deep-Sea Research Part II: Topical Studies in Oceanography 1 publication, 25%
Aquaculture International	Aquaculture International, 1, 25% Aquaculture International 1 publication, 25%
Trudy VNIRO	Trudy VNIRO, 1, 25% Trudy VNIRO 1 publication, 25%
Doklady Biological Sciences	Doklady Biological Sciences, 1, 25% Doklady Biological Sciences 1 publication, 25%
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Elsevier	Elsevier, 1, 25% Elsevier 1 publication, 25%
Springer Nature	Springer Nature, 1, 25% Springer Nature 1 publication, 25%
Russian Federal Research Institute of Fisheries and Oceanography	Russian Federal Research Institute of Fisheries and Oceanography, 1, 25% Russian Federal Research Institute of Fisheries and Oceanography 1 publication, 25%
Pleiades Publishing	Pleiades Publishing, 1, 25% Pleiades Publishing 1 publication, 25%
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Rodkina S. A. et al. Diet of deep-sea holothurians in theVolcanologists Massif, Bering sea, as inferred from stable isotope and fatty acid analyses // Deep-Sea Research Part II: Topical Studies in Oceanography. 2023. Vol. 208. p. 105266.

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Rodkina S. A., Kiyashko S. I., MORDUKHOVICH V. V. Diet of deep-sea holothurians in theVolcanologists Massif, Bering sea, as inferred from stable isotope and fatty acid analyses // Deep-Sea Research Part II: Topical Studies in Oceanography. 2023. Vol. 208. p. 105266.

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RIS Copy

TY - JOUR

DO - 10.1016/j.dsr2.2023.105266

UR - https://doi.org/10.1016%2Fj.dsr2.2023.105266

TI - Diet of deep-sea holothurians in theVolcanologists Massif, Bering sea, as inferred from stable isotope and fatty acid analyses

T2 - Deep-Sea Research Part II: Topical Studies in Oceanography

AU - Rodkina, S A

AU - Kiyashko, S I

AU - MORDUKHOVICH, VLADIMIR V.

PY - 2023

DA - 2023/04/01 00:00:00

PB - Elsevier

SP - 105266

VL - 208

SN - 0967-0645

ER -

BibTex

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BibTex Copy

@article{2023_Rodkina,

author = {S A Rodkina and S I Kiyashko and VLADIMIR V. MORDUKHOVICH},

title = {Diet of deep-sea holothurians in theVolcanologists Massif, Bering sea, as inferred from stable isotope and fatty acid analyses},

journal = {Deep-Sea Research Part II: Topical Studies in Oceanography},

year = {2023},

volume = {208},

publisher = {Elsevier},

month = {apr},

url = {https://doi.org/10.1016%2Fj.dsr2.2023.105266},

pages = {105266},

doi = {10.1016/j.dsr2.2023.105266}

}

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Publisher

Elsevier

Journal

Deep-Sea Research Part II: Topical Studies in Oceanography

Quartile SCImago

Quartile WOS

Impact factor

ISSN

09670645 (Print)

Labs

Laboratory of Taxonomy and Morphology

Profiles

Mordukhovich, Vladimir V