WG-EMM-2022

The Scientific Committee requested DSAG to review the Rules for access and use of CCAMLR Data, which was presented for consideration at the Scientific Committee symposium. This document describes the implementation of the Rules for Access and use of CCAMLR Data into the CCAMLR Data Request procedure and the procedure for Read More
Soumis par:
Anton Van de Putte (Belgique)

Approuvé par:
Anton Van de Putte (Belgique)

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This document is intended to address several issues related to the development of recruitment indices for Antarctic krill from net-tow data. We address three primary issues: 1) the view that length-frequency data collected by long-term monitoring programs that have used nets other than the RMT-8 cannot be used to parameterize Grym simulations, 2) that Read More
Soumis par:
Christian Reiss (États-Unis d'Amérique)

Approuvé par:
George Watters (États-Unis d'Amérique)

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Proportional recruitment is a concept that summarizes the variability of new individuals entering a population over time. Two parameters characterizing proportional recruitment, the mean and standard deviation of the interannual proportion of juveniles in the population, are important inputs to the Generalised Yield Model in R (GRYM). The GRYM is a simulation framework that defines Read More
Soumis par:
Doug Kinzey (États-Unis d'Amérique)

Approuvé par:
George Watters (États-Unis d'Amérique)

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Silverfish Bay is an area of high ecological value, included in ASPA No. 173 and in the Ross Sea region MPA (General Protection Zone (i)). Despite its importance, different sectors are to date underexplored, such as the little-known shelf benthic communities that live at depths between 150 and 550 metres in areas periodically covered by sea ice Read More
Soumis par:
Erica Carlig (Italie)

Approuvé par:
Marino Vacchi (Italie)

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We present a summary of the euphausiid larvae collected during the summer seasons of 2019 and 2020 in waters off the West Antarctic Peninsula (Mar de la Flota/Bransfield Strait) and Elephant Island surroundings. During 2019 E. superba and Thysanoessa macrura abundances were very high, while during 2020 Read More
Soumis par:
Emilce Florencia Rombolá (Argentina)

Approuvé par:
Enrique Marschoff (Argentina)

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We propose a revision to CM 51-07 that would distribute catches and increase the catch limit in Subarea 48.1. This revision utilizes all three elements of the agreed management strategy for the krill fishery, and we provide a brief rationale for selecting each element. In general we selected parameters for the Generalised Yield Model in R (Grym) that are scientifically Read More
Soumis par:
George Watters (États-Unis d'Amérique)

Approuvé par:
George Watters (États-Unis d'Amérique)

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An international workshop to investigate a potential use of ageing method for the Antarctic krill (Euphausia superba, Dana) based on growth band counts observed in krill eyestalks was held in August and November 2021. The workshop was attended by 14 participants from 7 nations and investigated the technique using laboratory bred known age Read More
Soumis par:
So Kawaguchi (Australia)

Approuvé par:
Philippe Ziegler (Australia)

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The annual meeting of the SCAR Krill Action Group (SKAG) was held online from 7 to 11 March 2022 at 1500-1700 UTC as a series of Zoom meetings, and attended by around 60 participants each day. The meeting consisted of SKAG administrative updates, a series of presentations on new data collection methods, a session led by the US AMLR group on variability in krill recruitment Read More
Soumis par:
So Kawaguchi (Australia)

Approuvé par:
Philippe Ziegler (Australia)

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This document is submitted to the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR) in accordance with Decision 9 of ATCM-XXVIII, which indicates that CCAMLR approval is required for the creation of ASPAs or ASMAs that contain marine areas in which there is actual or potential harvest, or for which there are regulations Read More
Soumis par:
Carla Ximena Salinas (Chili)

Approuvé par:
César Cárdenas (Chili)

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This paper provides a summary description and analysis of the activities the fishing ship Antarctic Endeavour carried out in the Antarctic krill (Euphausia superba) fishery to produce krill meal between December 2020 and November 2021. The effort, catch, CPUE, and length-frequency distributions of captured krill are recorded per trip and sub- area. Also, trip-by-trip bycatch data from each Read More
Soumis par:
César Cárdenas (Chili)

Approuvé par:
César Cárdenas (Chili)

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Workshops were held in 2020 and 2021 between French and South African partners to refine the pelagic work packages planned for WP1: Ecoregionalisation within the subantarctic pelagic realm. Funding from ASOC (Antarctic and Southern Ocean Coalition) was granted to finance a short-term project “Ecoregionalisation of the Eastern Sub Antarctic Region” from Nov 2021-Aug 2022 with Read More
Soumis par:
Azwianewi Makhado (Afrique du Sud)

Approuvé par:
Azwianewi Makhado (Afrique du Sud)

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Here we present preliminary results on krill distribution from data collected from the Norwegian fishing vessel (F/V) Antarctic Endurance during her commercial operation for Antarctic krill in subareas 48.1 and 48.2 during different timings of the year in 2020, 2021 and 2022. 

Our seasonal investigations demonstrate the potential of using fishing vessels as research platforms to Read More
Soumis par:
Bettina Meyer (Allemagne)

Approuvé par:
Thomas Brey

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This document presents a preliminary climate change characterization of the Southern Indian Ocean focusing on temperature-related climatic impact-drivers, notably warming, climate velocities, and marine heatwaves. The analysis is performed on both observations and CMIP6 model outputs.

Key Messages

• A CMIP6 multi-model analysis over the Southern Indian Ocean indicates an average Read More
Soumis par:
Marc Eléaume (France)

Approuvé par:
Marc Eléaume (France)

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This document presents a preliminary assessment of CMIP6 models focusing on projected climate change impact on primary production in the Southern Indian Ocean.

Key Messages

• At the Southern Indian Ocean basin-scale, primary productivity is projected to increase in response to climate change (between 5% and 10% by 2081-2100 with respect to 1995-2014 under the current "modest Read More
Soumis par:
Marc Eléaume (France)

Approuvé par:
Marc Eléaume (France)

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Five years after the establishment of the RSRMPA, Members were invited to report on research and monitoring activities undertaken in relation to the MPA. Following the establishment of the RSRMPA Italian activities in the area continued in the frame of 65 PNRA supported projects. Information on the activities were submitted to the CCAMLR MPA Read More
Soumis par:
Laura Ghigliotti (Italie)

Approuvé par:
Marino Vacchi (Italie)

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During the Continental Shelf Multidisciplinary Flux Study (COSMUS) expedition from February to March 2021 aboard RV Polarstern (expedition ID: PS124) (Hellmer & Holtappels, 2021), a large spawning aggregation of notothenioid icefish (Neopagetopsis ionah, Nybelin 1947) was discovered in the southern Weddell Sea. The CCAMLR community was informed of this discovery by Germany in COMM Read More
Soumis par:
Katharina Teschke (Allemagne)

Approuvé par:
Thomas Brey

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Antarctic krill (Euphausia superba) is a fundamental species within the Antarctic ecosystem yet also target of the largest commercial fishery in the Southern Ocean. An understanding of the distribution and abundance of krill across appropriate spatial and temporal scales is necessary to implement a new management framework for the krill fishery, endorsed by the Read More
Soumis par:
Vicky Warwick-Evans (Royaume-Uni)

Approuvé par:
Chris Darby

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The Risk Assessment (RA) provides a framework by which to identify the optimum management units to spatially and temporally subdivide the catch limit for the krill fishery, with the aim of reducing risks to the ecosystem. It is a data limited approach that will allow CCAMLR to implement precautionary management to address spatial and temporal aggregation of fishing effort and Read More
Soumis par:
Vicky Warwick-Evans (Royaume-Uni)

Approuvé par:
Chris Darby

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• This paper provides an overview of CCAMLR-related ecosystem monitoring and scientific activities undertaken by the British Antarctic Survey (BAS) during the period April 2021 to March 2022.
• BAS research is focussed on the Scotia Sea region (Area 48) and the 2021/22 season saw reduced sea ice extent in the Scotia Sea with Read More
  Soumis par:
  Martin Collins (Royaume-Uni)
  
  Approuvé par:
  Chris Darby
  
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Evaluating the effects of climate change on Southern Ocean marine living resources is a priority topic for CCAMLR and was identified by the 2022 Scientific Committee Symposium as a key area of research. Acknowledging the need to better coordinate, target and integrate scientific advice on climate change, and recognising that a focused workshop would enable progress to Read More
Soumis par:
Rachel Cavanagh (Royaume-Uni)

Approuvé par:
Chris Darby

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To facilitate the discussion to progress the new krill management approach for Subarea 48.1, text changes to the current conservation measures CM 51-01 and CM 51-07 were proposed with some rationales given. Two options were outlined in Annex 1 and Annex 2 for consideration, corresponding to simultaneous revisions of CM 51-01 and CM 51-07 together and CM 51-07 alone Read More
Soumis par:
Xianyong Zhao (Chine)

Approuvé par:
Xianyong Zhao (Chine)

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A preliminary review of data obtained as a result of observations under the CEMP program in the region of the Argentine Islands, the Antarctic Peninsula is presented.

Community composition and abundance of zooplankton collected from three Ukrainian longline fishery vessels, Calypso, Marigolds and Simeiz have been studied in the top 100 m layer in the Read More
Soumis par:
Kostiantyn Demianenko (Ukraine)

Approuvé par:
Kostiantyn Demianenko (Ukraine)

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In fulfillment of the duties assumed by Ukraine at the XXXVI session of the CCAMLR in 2017, Ukrainian national scientific observers, in addition to their main tasks, also carried out some oceanological works that were possible on fishing Read More
Soumis par:
Kostiantyn Demianenko (Ukraine)

Approuvé par:
Kostiantyn Demianenko (Ukraine)

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At its 2022 meeting, the WG-ASAM updated the krill biomass estimates for the seven proposed strata (namely the JI, BS, EI, SSIW, GS, PB and DP) in Subarea 48.1. However the biomass estimates with its associated CV for the combined strata, has not been provided yet, which is critical for generating the Precautionary Catch Limit (PCL) using the GrYM model Read More
Soumis par:
Xinliang Wang (Chine)

Approuvé par:
Xianyong Zhao (Chine)

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Among large cetaceans in the Southern Hemisphere, fin whales were the most heavily exploited in terms of numbers taken during the period of intense industrial whaling. Recent studies suggest that, whilst some humpback whale populations in the Southern Hemisphere have almost completely recovered to their estimated pre-whaling abundance, much less is known about the status of Southern Hemisphere Read More
Soumis par:
Martin Biuw

Approuvé par:
Bjørn Krafft (Norvège)

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We provide proposals on Risk assessment framework to allocate catch in Subarea 48.1 accompanied  by relevant  Russian studies carried out in recent years.

In this paper, the authors consider inter-vessel variability in the length composition of krill in catches  from research and commercial catches  in the context of gear designs and the efficiency of observer sampling design in krill fishery. Analysis was provided using data obtained in the local fishing ground within several days to exclude any Read More
Soumis par:
Svetlana Kasatkina (Fédération de Russie)

Approuvé par:
Svetlana Kasatkina (Fédération de Russie)

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We performed a review of the commercial trawl systems based on information provided in the krill fishery notifications.  We provide scheme to streamline trawl systems in krill fishery using Read More
Soumis par:
Svetlana Kasatkina (Fédération de Russie)

Approuvé par:
Svetlana Kasatkina (Fédération de Russie)

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The paper presents data on the spatial distribution, density and size composition of salps of the Salpidae family in the Area 48 in January-December 2020 according to the Russian survey on the RV "Atlántida". The paper presents summarized data on two species of salps found in the research area - Salpa thompsoni and Ihlea racovitzai, obtained using the Read More
Soumis par:
Svetlana Kasatkina (Fédération de Russie)

Approuvé par:
Svetlana Kasatkina (Fédération de Russie)

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This study focuses on the size distribution and biology of Antarctic krill data obtained during the Synoptic Survey CCAMLR-2000 and the Russian acoustic survey on RV “Atlántida” in January-March 2020. In it there are noted differences in the spatial distribution of various-sized groups of Antarctic krill, as well as differences in the distribution of maturity stages by Read More
Soumis par:
Svetlana Kasatkina (Fédération de Russie)

Approuvé par:
Svetlana Kasatkina (Fédération de Russie)

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Aiming to develop a method to estimate the length-weight relationship for concurrent acoustic monitoring of Antarctic krill biomass, a pilot experiment was undertaken to evaluate the feasibility of measuring the weight of fresh Antarctic krill at sea by scientific observers onboard krill fishing vessel, where multiple individuals of the same length class was weighed Read More
Soumis par:
Xianyong Zhao (Chine)

Approuvé par:
Xianyong Zhao (Chine)

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The document contains information about a scientific expedition (B121) with the research vessel Australis, which has relevance for CCAMLR. In addition, 2 additional expeditions with this nimble vessel are planned to be carried out in the Read More
Soumis par:
Anton Van de Putte (Belgique)

Approuvé par:
Anton Van de Putte (Belgique)

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One site is proposed herein as a VME based on high abundances of VME indicator taxa that exceed abundances of previously registered VMEs. The site is a wall off Cape Well-Met, Vega Island, Eastern Antarctic Peninsula. Video imagery was taken via submarine deployed by a tourist vessel. Data on the relative percent cover of all VME Read More
Soumis par:
Anton Van de Putte (Belgique)

Approuvé par:
Anton Van de Putte (Belgique)

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During the summer of 2022 (January/February), seabird and marine mammals surveys were performed on Welchness Cape, Dundee Island. The purpose of preliminary studies was to generate a baseline data on biodiversity occurring at this location, and eventually establish it as a study site for research and monitoring. This is a first attempt to gather Read More
Soumis par:
Marina Abas

Approuvé par:
Enrique Marschoff (Argentina)

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As part of the initial stages towards the development of a Research and Monitoring Plan (RMP) for the proposed Domain 1 Marine Protected Area (D1MPA), we identified the need to map the extensive research being undertaken by Members that can potentially contribute to this plan. This mapping exercise initiated with national surveys and workshops at both the Argentine Read More
Soumis par:
Marina Abas

Approuvé par:
Enrique Marschoff (Argentina)

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The CCAMLR MPA Information Repository (CMIR) was designed to provide a database for Members to upload, review, track, and report on projects relating to MPAs; enable a more holistic and integrative approach towards ecosystem research associated MPAs; and provide key stakeholders and the public with access to data, information and management measures Read More
Soumis par:
Steve Parker (Secrétariat de la CCAMLR)

Approuvé par:
David Agnew (Secrétariat de la CCAMLR)

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We summarise the CCAMLR Ecosystem Monitoring Program (CEMP) data submissions for the 2021/22 monitoring season detailed by site and species, as well as providing an updated Combined Standardised Index (CSI) analysis for Area 48, and a composite of complete data holdings for each time series of observations. We recommend that the Working Group consider a Read More
Soumis par:
Claire Van Werven (Secrétariat de la CCAMLR)

Approuvé par:
David Agnew (Secrétariat de la CCAMLR)

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Since 2019 there has been considerable discussion by the Scientific Committee and its Working Groups regarding data collection issues in the krill fishery. This document outlines issues that have been identified for consideration by the Scientific Committee and its working groups, processes to address these, and a timeline for changes to forms and instructions Read More
Soumis par:
So Kawaguchi (Australia)

Approuvé par:
Philippe Ziegler (Australia)

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In polar regions, polynyas – open water areas within the sea ice – are “hot spots” of high biological productivity, yet polynyas remain understudied. These hot spots play outsized roles in Antarctic sea ice production, deep water formation, global thermohaline circulation, carbon sequestration, and biological activity including phytoplankton blooms and Read More
Soumis par:
Anton Van de Putte (Belgique)

Approuvé par:
Anton Van de Putte (Belgique)

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The current krill management approach endorsed by CCAMLR will require systematic data collection on a variety of spatial and temporal scales for each of the three pillars of the plan: the biomass assessment, the Grym model, and the risk assessment layer. The CCAMLR Scheme of International Scientific Observers (SISO) is one source of data with the potential to provide much of Read More
Soumis par:
Ryan Driscoll

Approuvé par:
Thomas Brey

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As an apex krill-dependent predator, Antarctic fur seals (Arctocephalus gazella, AFS) are a key indicator species for the CCAMLR Ecosystem Monitoring Programme (CEMP). The prevailing conservation paradigm for AFS is a circumpolar, panmictic, stable population; however, a suite of recent research concludes that there are at least four strongly Read More
Soumis par:
Douglas Krause (États-Unis d'Amérique)

Approuvé par:
George Watters (États-Unis d'Amérique)

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The Eastern Weddell Sea Observation System (EWOS) is an initiative to sample components of the Antarctic marine ecosystem through an international collaborative, multidisciplinary approach in order to characterize the ecosystem within a well-defined and diverse region in the Weddell Sea. The EWOS pilot study was carried out on the R/V Polarstern in March-April of 2022. There Read More
Soumis par:
Christopher Jones (États-Unis d'Amérique)

Approuvé par:
George Watters (États-Unis d'Amérique)

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Twenty-one individuals of Adélie penguins were tagged with geolocators during the first week of January 2021 in Ardley Island, a CEMP site located in the Fildes Peninusla, southwest of King George Island in Western Antarctica. Eleven GLS were subsequently recovered during December 2021 (52% recovery rate). Two daily locations for each individual track were calculated using Read More
Soumis par:
Alvaro Soutullo (Uruguay)

Approuvé par:
Oscar Pin (Uruguay)

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During the 2021-2022 Committee for Environmental Protection (CEP) intersessional period, the United States completed its 5-year review of the management plans for ASPA No. 152 Western Bransfield Strait and ASPA No.153 Eastern Dallmann Bay. The  comprehensive review of these sites in close consultation with scientists working in the Area verified that the values under Read More
Soumis par:
Polly A. Penhale (États-Unis d'Amérique)

Approuvé par:
George Watters (États-Unis d'Amérique)

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Ten submarines dives were conducted in Subarea 48.1 in 2022 (GP22). Seven sites are proposed herein as VMEs based on high abundances of VME indicator taxa that cluster with, and in many cases, exceed abundances of previously registered VMEs. Video imagery was taken via submarine and data on the relative percent cover of all VME Read More
Soumis par:
Anton Van de Putte (Belgique)

Approuvé par:
Anton Van de Putte (Belgique)

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After the establishment of Ross Sea Region Marine Protected Area (RSRMPA) in 2017, Republic of Korea granted a Research and Development (R&D) program to understand the impact of climate change on the structure and function of the ecosystem in RSRMPA for five years between 2017 and 2022. And thus, the ‘Korea Ecosystem Structure and Function of Marine Read More
Soumis par:
Jeong-Hoon Kim (Corée, Rép. de)

Approuvé par:
Jung-re Riley Kim (Corée, Rép. de)

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Populations of the macaroni penguin Eudyptes chrysolophus and the eastern rockhopper penguin E. filholi breeding at Marion Island (Prince Edward Islands) in the sub-Antarctic Indian Ocean decreased from 1994 to 2018.

We examined their diets when rearing chicks during this period. There was substantial overlap in the diets of the two species, with crustaceans, dominated by the Read More
Soumis par:
Azwianewi Makhado (Afrique du Sud)

Approuvé par:
Azwianewi Makhado (Afrique du Sud)

Publication:
Afr. J. Mar. Sci., 43 (2) (2021): 187–199, doi: 10.2989/1

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Long-standing concerns about concentrated catches have guided krill-fishery management for over three decades, and history demonstrates that these concerns are valid. Ironically, the presumed precautionary approach to manage the krill fishery failed to prevent the very concentration of fishing CCAMLR intended to avoid, but the relatively low catch limits specified in CM 51-07 have mitigated Read More
Soumis par:
George Watters (États-Unis d'Amérique)

Approuvé par:
George Watters (États-Unis d'Amérique)

Publication:
Conserv. Biol. (2022): e13925, doi: https://doi.org/10.1111/cobi.13925

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Estimates of the distribution and density of Antarctic krill (Euphausia superba Dana, 1850) were derived from a large-scale survey conducted during the austral summer in the Southwest Atlantic sector of the Southern Ocean and across the Scotia Sea in 2018–19, the ‘2018–19 Area 48 Survey’. Survey vessels were provided by Norway, the Association of Responsible Krill Read More
Soumis par:
Bjørn Krafft (Norvège)

Approuvé par:
Bjørn Krafft (Norvège)

Publication:
J. Crust. Biol., 41 (3) (2021): 1–17. https://doi.org/10.1093/jcbiol/ruab046

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The spatio-temporal distributions of the epipelagic mesozooplankton community in the western Ross Sea region marine protected area (RSR MPA) were investigated. Mesozooplankton surveys were conducted in February 2018, January 2019, and March 2020 from an approximate depth of 200 m to address the essential environmental factors influencing the mesozooplankton community structure. Our Read More
Soumis par:
Jeong-Hoon Kim (Corée, Rép. de)

Approuvé par:
Doo Nam Kim

Publication:
Front. Mar. Sci., 2022. 9: 860025. doi: 10.3389/fmars.2022.860025

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Meso- and macrozooplankton play crucial roles in the trophic web and the biological carbon pump in the ocean by transferring energy from lower to higher trophic levels and vertically exporting carbon from the surface to the deep ocean and seabed. In this study, zooplankton community structures in the Ross Sea, Antarctica, were analyzed using metabarcoding methods. Both regular barcode (RB) ( Read More
Soumis par:
Jeong-Hoon Kim (Corée, Rép. de)

Approuvé par:
Doo Nam Kim

Publication:
Genes, 2022, 13 (5): 922. https://doi.org/10.3390/genes13050922

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The most problematic issue in the ocean color application is the presence of heavy clouds, especially in polar regions. For that reason, the demand for the ocean color application in polar regions is increased. As a way to overcome such issues, we conducted the reconstruction of the chlorophyll-a concentration (CHL) data using the machine learning-based models to raise the usability of CHL Read More
Soumis par:
Jeong-Hoon Kim (Corée, Rép. de)

Approuvé par:
Doo Nam Kim

Publication:
Remote Sens., 2019, 11 (11): 1366, https://doi.org/10.3390/rs11111366

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Polar regions are too harsh to be continuously observed using ocean color (OC) sensors because of various limitations due to low solar elevations, ice effects, peculiar phytoplankton photosynthetic parameters, optical complexity of seawater and persistence of clouds and fog. Therefore, the OC data undergo a quality-control process, eventually accompanied by considerable data loss. We attempted Read More
Soumis par:
Jeong-Hoon Kim (Corée, Rép. de)

Approuvé par:
Doo Nam Kim

Publication:
Remote Sens. 2020, 12 (11): 1898; doi: https://doi.org/10.3390/rs12111898

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Antarctic krill (Euphausia superba) are amongst the most abundant animals on Earth, with a circumpolar distribution in the Southern Ocean. Genetic and genomic studies have failed to detect any population structure for the species, suggesting a single panmictic population. However, the hyper-abundance of krill slows the rate of genetic differentiation, masking potential underlying Read More
Soumis par:
Philippe Ziegler (Australia)

Approuvé par:
Philippe Ziegler (Australia)

Publication:
Mol. Ecol., 2021. 30: 1042-1052, doi: https://doi.org/10.1111/mec.15771

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The undergoing rapid climate changes recorded along the Western Antarctic Peninsula (WAP) in combination with the increasing seasonal catches reported by the krill fishery have raised concerns as to whether the management strategy established by the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR) is effectively avoiding impacts on the krill stock and related Read More
Soumis par:
Francisco Santa Cruz (Chili)

Approuvé par:
César Cárdenas (Chili)

Publication:
Ocean and Coastal Management, 223 (2022): 106146

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This study examines the adaptability of a Southern Ocean predator, that is dependent on Antarctic krill (Euphausia superba), to potential changes in food availability. Muscle fatty acids of the spiny icefish Chaenodraco wilsoni were collected from three areas in the Bransfield Strait, northern Antarctic Peninsula during February–April 2016 Read More
Soumis par:
Guoping Zhu (Chine)

Approuvé par:
Xianyong Zhao (Chine)

Publication:
J. Fish Biol., 1–13 (2022), doi: 10.1111/jfb.15120

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The northern Antarctic Peninsula is a high-productivity region for biological resources in the Antarctic. Physical oceanographic processes produce strong ecosystem dynamics via mass transport and water exchange. However, few studies have focused on these processes from coast to shelf and across slopes by tidal dynamics. Therefore, a numerical model was Read More
Soumis par:
Guoping Zhu (Chine)

Approuvé par:
Xianyong Zhao (Chine)

Publication:
Polar Science, 23 (2020): 100506

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The northern Antarctic Peninsula (NAP) supports a few human activities. It is affected by intense climate change and anthropogenic threats. Antarctic krill (Euphausia superba) is the largest, by mass, in the Southern Ocean and is the keystone species in the Antarctic ecosystem. In this study, we report the concentrations of trace elements, i.e., zinc [Zn Read More
Soumis par:
Guoping Zhu (Chine)

Approuvé par:
Xianyong Zhao (Chine)

Publication:
Ecological Indicators, 2022, 136: 108596

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Sea ice is the major constraint on human activities in the Southern Ocean. Depending on a vessel's ice class, human mobility may be restricted or even prevented altogether by sea-ice conditions. This may imply limited access to research or monitoring stations, preferred fishing grounds or attractive tourist sites. Here, we introduce a statistical model that evaluates the sea-ice cover with two Read More
Soumis par:
Katharina Teschke (Allemagne)

Approuvé par:
Thomas Brey

Publication:
Ant. Sci., 34 (1) (2022): 97–104, https://doi.org/10.1017/S0954102021000523

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A breeding colony of notothenioid icefish (Neopagetopsis ionah, Nybelin 1947) of globally unprecedented extent has been discovered in the southern Weddell Sea, Antarctica. The colony was estimated to cover at least
240 km² of the eastern flank of the Filchner Trough, comprised of fish nests at a density of 0.26 nests per square meter, representing an estimated total of
~ Read More
Soumis par:
Katharina Teschke (Allemagne)

Approuvé par:
Thomas Brey

Publication:
Current Biology, 32 (4) (2022): 842–850, https://doi.org/10.1016/j.cub.2021.12.022

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Antarctic fur seals (AFS) are an ecologically important predator and a focal indicator species for ecosystem-based Antarctic fisheries management. This species suffered intensive anthropogenic exploitation until the early 1900s, but recolonized most of its former distribution, including the southern-most colony at Cape Shirreff, South Shetland Islands (SSI). Read More
Soumis par:
Douglas Krause (États-Unis d'Amérique)

Approuvé par:
George Watters (États-Unis d'Amérique)

Publication:
Front. Mar. Sci., 8 (2022): 796488, doi:10.3389/fmars.2021.796488

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Fin (Balaenoptera physalus, Linnaeus 1758) and humpback (Megaptera novaeangliae, Borowski 1781) whales feed during the austral summer in Antarctic waters. Despite the spatial (two-dimensional) sympatry of both species, they exhibit trophic segregation (three-dimensional). We used multitemporal presence- Read More
Soumis par:
Enrique Marschoff (Argentina)

Approuvé par:
Enrique Marschoff (Argentina)

Publication:
Polar Biol. (accepted)

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The GrYM model is now ready for used in the new krill management approach. However, some of the important model input parameters were still to be determined. The present paper introduced briefly the status of the model parameter developments to contribute to the discussion at WG-SAM-2022.

Precautionary yield ('gamma', the proportion of stock biomass harvested annually) for the Antarctic krill fishery is currently chosen by comparing krill spawning stock biomass (SSB) during 20-year model projections to pre-exploitation spawning stock biomass (SSB0). Both SSB and SSB0 are simulated for these projections using input data considered known. Precautionary yield derived Read More
Soumis par:
Doug Kinzey (États-Unis d'Amérique)

Approuvé par:
George Watters (États-Unis d'Amérique)

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