Corrigenda to: Standing stock of Antarctic krill (<i>Euphausia superba</i> Dana, 1850) (Euphausiacea) in the Southwest Atlantic sector of the Southern Ocean, 2018–19

Krafft, Bjørn A.; Macaulay, Gavin J.; Skaret, Georg; Knutsen, Tor; Bergstad, Odd Aksel; Lowther, Andrew D.; Huse, Geir; Fielding, Sophie; Trathan, Philip N.; Murphy, Eugene J.; Choi, Seok-Gwan; Chung, Sangdeok; Han, Inwoo; Lee, Kyounghoon; Zhao, Xiaolan; Wang, Xinliang; Ying, Yiping; Yu, Xiubo; Demianenko, Kostiantyn; Podhornyi, Viktor; Vishnyakova, Karina; Pshenichnov, Leonid; Chuklin, Andrii; Shyshman, Hanna; Cox, Martin J.; Reid, Keith; Watters, George M.; Reiss, Christian S.; Hinke, Jefferson T.; Arata, Javier; Godø, Olav Rune; Hoem, Nils

doi:10.1093/jcbiol/ruab071

Cited by 30 publications

(36 citation statements)

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“…Regional scale krill biomass in the southwest Atlantic sector has only been surveyed twice, in 2000 and 2019. These two surveys of an area of c. 2 M km 2 provided similar biomass estimates (60.3 and 62.6 Mt, respectively) (SC-CCAMLR, 2010; Krafft et al, 2021).…”

Section: Evidence Of Past Changementioning

confidence: 73%

Status, Change, and Futures of Zooplankton in the Southern Ocean

et al. 2022

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In the Southern Ocean, several zooplankton taxonomic groups, euphausiids, copepods, salps and pteropods, are notable because of their biomass and abundance and their roles in maintaining food webs and ecosystem structure and function, including the provision of globally important ecosystem services. These groups are consumers of microbes, primary and secondary producers, and are prey for fishes, cephalopods, seabirds, and marine mammals. In providing the link between microbes, primary production, and higher trophic levels these taxa influence energy flows, biological production and biomass, biogeochemical cycles, carbon flux and food web interactions thereby modulating the structure and functioning of ecosystems. Additionally, Antarctic krill (Euphausia superba) and various fish species are harvested by international fisheries. Global and local drivers of change are expected to affect the dynamics of key zooplankton species, which may have potentially profound and wide-ranging implications for Southern Ocean ecosystems and the services they provide. Here we assess the current understanding of the dominant metazoan zooplankton within the Southern Ocean, including Antarctic krill and other key euphausiid, copepod, salp and pteropod species. We provide a systematic overview of observed and potential future responses of these taxa to a changing Southern Ocean and the functional relationships by which drivers may impact them. To support future ecosystem assessments and conservation and management strategies, we also identify priorities for Southern Ocean zooplankton research.

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Section: Evidence Of Past Changementioning

confidence: 73%

Status, Change, and Futures of Zooplankton in the Southern Ocean

et al. 2022

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“…Further, as other baleen whale populations recover, competitive effects may increase, both amongst krill predators and with the krill fishery. Currently, catch levels in the study area remain low in real terms (~155,000 tonnes) compared with estimates of local krill biomass (~19.2 million tonnes in 2019; Krafft et al, 2021). However, the fishery regularly operates in favoured areas where krill biomass is predictable, but which are also areas used by krill predators (Trathan et al, 2022).…”

Section: Discussionmentioning

confidence: 90%

Spatiotemporal Overlap of Baleen Whales and Krill Fisheries in the Western Antarctic Peninsula Region

et al. 2022

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In Antarctica, abundant consumers rely on Antarctic krill for food, but krill are also the subject of a commercial fishery. The fishery overlaps in time and space with the foraging areas of these consumers, thus potential competition between krill fisheries and krill consumers is a major management concern. The fishery is managed by the Commission for the Conservation of Antarctic Marine Living Resources with an ecosystem approach, according to which fishing should not interfere with either the population growth of krill, or krill-dependent consumers. Krill catches have become increasingly spatially concentrated in a small number of hotspots, raising concerns about how local depletion of krill impacts consumers. Such concentrated fishing demonstrates that there is a mismatch between the spatial and temporal scale at which krill fisheries are currently managed, and that at which fisheries operate and consumers forage. Information on the seasonal dynamics of predator abundance and their foraging behaviour is fundamental to future precautionary management of the krill fishery. We analysed the spatiotemporal distribution of two major krill consumers – humpback and minke whales – and that of krill fishing, off the Western Antarctic Peninsula. We used whale tracking data (58 humpback whale tracks and 19 minke whale tracks) to develop spatial random forest models predicting the monthly distribution of whale foraging areas from January-July. Using these predictions, we calculated spatiotemporally-explicit geographic overlap between whales and fisheries, the latter represented by krill fishing effort and catch data. Over the krill fishing season, fishing effort and catch hotspots shifted to the southwest, into the Bransfield Strait where effort and catch was highest. Predicted humpback whale foraging areas increased in the Bransfield Strait over the same period, while predicted minke whale foraging areas showed an opposite trend. For both we predicted a whale-fishing interaction hotspot in the Bransfield Strait, strongest in April and May. Our results illustrate the fine spatial scale of likely interactions between baleen whales and the krill fishery, and their concentration over the season, underlining the need for fishery management more closely aligned to the spatiotemporal scale of likely predator-fishery interactions.

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“…Observations to validate our model predictions especially outside of the current study area will almost certainly require new survey effort in both space and time. There is the potential that fishing vessels could be used to sample krill density, as they do in the South Orkney Island (Krafft 2015 ; Kraft et al 2021 ). Indeed, this approach is being discussed within CCAMLR for implementation in the Antarctic Peninsula region.…”

Section: Discussionmentioning

confidence: 99%

“…Hewitt et al 2004 ) scales (Atkinson et al 2008 ; Ross et al 2014 ; Reiss et al 2017 ). Moreover, there is conflicting evidence of a long-term decline in abundance (Atkinson et al 2004 , but see Kinzey and Watters 2013 ; Cox et al 2018 ; Krafft et al 2021 ).…”

Section: Introductionmentioning

confidence: 99%

Estimating the average distribution of Antarctic krill Euphausia superba at the northern Antarctic Peninsula during austral summer and winter

et al. 2022

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This study was performed to aid the management of the fishery for Antarctic krill Euphausia superba. Krill are an important component of the Antarctic marine ecosystem, providing a key food source for many marine predators. Additionally, krill are the target of the largest commercial fishery in the Southern Ocean, for which annual catches have been increasing and concentrating in recent years. The krill fishery is managed by the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR), which has endorsed a new management framework that requires information about the spatial distribution and biomass of krill. Here, we use krill density estimates from acoustic surveys and a GAMM framework to model habitat properties associated with high krill biomass during summer and winter in the northern Antarctic Peninsula region, an area important to the commercial fishery. Our models show elevated krill density associated with the shelf break, increased sea surface temperature, moderate chlorophyll-a concentration and increased salinity. During winter, our models show associations with shallow waters (< 1500 m) with low sea-ice concentration, medium sea-level anomaly and medium current speed. Our models predict temporal averages of the distribution and density of krill, which can be used to aid CCAMLR’s revised ecosystem approach to fisheries management. Our models have the potential to help in the spatial and temporal design of future acoustic surveys that would preclude the need for modelled extrapolations. We highlight that the ecosystem approach to fisheries management of krill critically depends upon such field observations at relevant spatial and temporal scales.

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Corrigenda to: Standing stock of Antarctic krill (Euphausia superba Dana, 1850) (Euphausiacea) in the Southwest Atlantic sector of the Southern Ocean, 2018–19

Cited by 30 publications

References 0 publications

Status, Change, and Futures of Zooplankton in the Southern Ocean

Status, Change, and Futures of Zooplankton in the Southern Ocean

Spatiotemporal Overlap of Baleen Whales and Krill Fisheries in the Western Antarctic Peninsula Region

Estimating the average distribution of Antarctic krill Euphausia superba at the northern Antarctic Peninsula during austral summer and winter

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