pelagic ecosystem monitoring of the key species of middle ... · - trends in antarctic krill,...
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Pelagic ecosystem monitoring of the key species of Middle Trophic Level in the Ross Sea
Istituto per le Risorse Biologiche e le Biotecnologie Marine (CNR-IRBIM) Ancona - ITALY
Iole Leonori, Andrea De Felice, Ilaria Biagiotti, Giovanni Canduci, Ilaria Costantini, Giordano Giuliani
Workshop “Oceano Antartide”Oltre 30 anni di ricerche oceanografiche in Antartide: Risultati e Prospettive
4-5 luglio 2019
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Acoustic surveys by CNR IRBIM were carried out in the Ross Sea in the ambit of PNRA - Italian National
Programme for Research in Antarctica- expeditions, in:
1989/90, 1994/95, 1997/98, 1999/00, 2003/04, 2013/14 and 2015/16
January 2004 January 2014 January 2016
Ross Ice Shelf
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Target species
Antarctic Krill (Euphausia superba)
Antarctic silverfish
(Pleuragrammaantarctica)
Ice Krill (Euphausia crystallorophias)
Acoustic surveys are a standard to provide apicture of the marine ecosystem comparableover time
in such a way that allow to the stakeholders anevaluation of the ecological status, spatialadequacy, and effectiveness of on the recentlyestablished Ross Sea Marine Protected Area.
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Trophic web in the Ross SeaMPA research and monitoringplan topics:
- Trends in Antarctic krill, crystalkrill, and Antarctic silverfishpopulations and demographicprocesses in relation to physicaldrivers, climate change, andpossible fishery effects.
- Effects of changes in theavailabilities of these specieson their respective predators.
Priority elements for ecosystemresearch:
- Acoustic surveys to mapdistribution and abundance ofAntarctic silverfish and krill.
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Acoustic sampling
Euphausia superba superswarms near ice edge
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Pelagic net sampling
E. superba swarm (left) and E. crystallorophias swarms (right) sampled by pelagic trawl. Headline and footrope positions in evidence in the echograms.
Biological measurements
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Oceanographic sampling
Oceanographic sampling is made incooperation with researchers from CNRIRBIM of Ancona and UniversitàParthenope of Naples in order to haveinformation on water massescharacteristics (CTD, XBT).
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• Inverse correlation between E. superba density and salinity in the water column
• Positive correlation between E. crystallorophias abundance and fluorescence
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New project: ROSSKRILL - Pelagic ecosystem monitoring of the key species of Middle Trophic Level in the Ross Sea Marine Protected Area
• Acoustic survey to be conducted during austral summer 2019-20 (or 2020-21 depending on installationof basic instruments on the new research vessel «Laura Bassi»), over a big portion of the recentlyinstituted MPA
• Hopefully at a larger scale than 2014 and 2016 surveys, similar to older surveys in the area (1994-2004); see figure below
• Installation of a SIMRAD WBAT operating for around one year at 70 and 120 kHz on Mooring B of the Marine Observatory of the Ross Sea to monitor seasonal local changes in krill abundance also in relation with ice formation and melting
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Thanks for your attention