Larval fish community in the Bay of Whales (eastern Ross sea): Species composition, relative abundance and spatial distribution

Early life stages of fish represent a key component in the food chain of the pelagic ecosystem of the Southern Ocean, connecting producer trophic levels to those of higher predators. Pelagic larvae and early juveniles of notothenioid fishes overwhelmingly dominate the ichthyoplankton community livin...

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Bibliographic Details
Published in:Deep Sea Research Part II: Topical Studies in Oceanography
Main Authors: La Mesa, Mario, Calì€, Federico, Di Franco, Antonio, Riginella, Emilio, Donato, Fortunata, Russo, Stefania, Papetti, Chiara, Castagno, Pasquale, Memmola, Francesco, Zambianchi, Enrico
Format: Article in Journal/Newspaper
Language:English
Published: Elsevier Ltd 2024
Subjects:
Antarctica
Bay of whale
Distribution
Larval assemblage
Pleuragramma antarcticum
Ross sea
Species composition
Antarc*
Antarctic
Antarctic silverfish
Ice Shelf
Ross Ice Shelf
Ross Sea
Southern Ocean
Online Access:https://hdl.handle.net/11577/3510856
https://doi.org/10.1016/j.dsr2.2024.105369
Description
Summary:Early life stages of fish represent a key component in the food chain of the pelagic ecosystem of the Southern Ocean, connecting producer trophic levels to those of higher predators. Pelagic larvae and early juveniles of notothenioid fishes overwhelmingly dominate the ichthyoplankton community living on the continental shelf. Scientific research surveys targeting early life stages of fish in the pelagic realm have been mainly carried out in the western Ross Sea, whereas the eastern side can be considered unexplored. As source of high primary production, the presence and timing of formation of wide ice-free areas throughout the year in the Ross Sea play a fundamental role in structuring larval fish community. The Ross Ice Shelf Polynya (RISP) is a large coastal polynya, which is driven and maintained by local prevailing winds and oceanic currents. In the present study, we report the first data on species composition, relative abundance and spatial distribution of larval fish community found off the Bay of Whales in the eastern Ross Sea. As reported for other areas of the Ross Sea, the Antarctic silverfish Pleuragramma antarcticum was by far the most abundant species, followed by other nototheniids and channichthyids in smaller amounts. The huge abundance of P. antarcticum early larvae supports the hypothesis of a potential nursery area near the Bay of Whales. Present results strongly advocate for future investigations in these poorly known and remote areas.

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