Spatial distribution of planktonic ciliates in waters around the northeastern Antarctic Peninsula and the South Orkney Plateau

Li, Haibo; Chen, Liang; Yang, Guang; Wang, Chaofeng; Zhang, Wuchang

doi:10.1007/s00300-023-03152-6

Cited by 2 publications

(1 citation statement)

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“…Despite several species of marine mammals almost being eradicated after the commercial harvest during the nineteenth and twentieth centuries and the Scotia Sea being one of the most heavily exploited areas, there have been clear signs of population recovery over recent decades [2,[8][9][10][11][12][13]. Considering ongoing and future climatic changes, and with the AP and Scotia Sea being among the fastest-warming areas on Earth [14,15], there is an increasing need to gain knowledge about the cascading effect that such environmental changes may have on the distribution patterns and ethology of the major krill predators. Additionally, the operation of the commercial krill fishery in this region has the potential to affect the marine mammal consumption requirements by removing or displacing prey and thus affecting their distribution [13,[16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Seasonal acoustic presence of marine mammals at the South Orkney Islands, Scotia Sea

Åsvestad,

Ahonen,

Menze

et al. 2024

R. Soc. open sci.

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Increased knowledge about marine mammal seasonal distribution and species assemblage from the South Orkney Islands waters is needed for the development of management regulations of the commercial fishery for Antarctic krill ( Euphausia superba ) in this region. Passive acoustic monitoring (PAM) data were collected during the autumn and winter seasons in two consecutive years (2016, 2017), which represented highly contrasting environmental conditions due to the 2016 El Niño event. We explored differences in seasonal patterns in marine mammal acoustic presence between the two years in context of environmental cues and climate variability. Acoustic signals from five baleen whale species, two pinniped species and odontocete species were detected and separated into guilds. Although species diversity remained stable over time, the ice-avoiding and ice-affiliated species dominated before and after the onset of winter, respectively, and thus demonstrating a shift in guild composition related to season. Herein, we provide novel information about local marine mammal species diversity, community structure and residency times in a krill hotspot. Our study also demonstrates the utility of PAM data and its usefulness in providing new insights into the marine mammal habitat use and responses to environmental conditions, which are essential knowledge for the future development of a sustainable fishery management in a changing ecosystem.

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Section: Introductionmentioning

confidence: 99%

Seasonal acoustic presence of marine mammals at the South Orkney Islands, Scotia Sea

Åsvestad,

Ahonen,

Menze

et al. 2024

R. Soc. open sci.

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Summertime tintinnids in surface water of the Weddell and Cosmonaut seas: community structure and relationships with different water masses

Li,

Wang

et al. 2023

Polar Research

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Weddell Gyre and Ross Gyre, which are major components of the Southern Ocean current system (Smith et al. 2007;Meredith et al. 2014). These currents play important roles in the heat transport and energy flow in the Southern Ocean and have an important impact on the distribution and survival of organisms.Microzooplankton are an important part of the ecosystem in the Southern Ocean (Garrison 1991). They are primary consumers of small phytoplankton as well as important food sources for metazoans and fish larvae (Friedenberg et al. 2012; Rollwagen-Bollens et al. 2022). As microzooplankton with a cell size ranging Abstract Tintinnids (Ciliophora) are important microzooplankton grazers. In the Southern Ocean, they are found in the Antarctic Zone, Polar Front and Subantarctic Zone. The Antarctic Zone encompasses large gyres (Weddell Gyre and Ross Gyre) and the Antarctic Slope Current around the continent. The influence of these water masses on tintinnid communities has not been studied. This study investigated the tintinnid community structure in the Weddell and Cosmonaut seas in the summer of 2022. In the Weddell Gyre, tintinnid abundance was significantly lower in the interior than at the fronts. The dominant species differed between the east and west fronts: the proportion of Codonellopsis gaussi was high at the west front, whilst Laackmanniella naviculaefera, Salpingella sp. and Salpingella faurei showed high abundances at the east front. Tintinnid communities varied from inshore to offshore of the Cosmonaut Sea, possibly because of the influence from the Antarctic Slope Current and Antarctic Circumpolar Current. The Antarctic Slope Current was characterized by the occurrence of Cymatocylis drygalskii, whilst the Antarctic Circumpolar Current was characterized by Codonellopsis glacialis, Cymatocylis convallaria and Cy. calyciformis. We proposed that Cy. drygalskii can be used as an indicator of the Antarctic Slope Current. Moreover, we classify polymorphic C. gaussi into three types, in accordance with their loricae, and report their distribution characteristics in water masses. Our results contribute to a better understanding of tintinnid horizontal distribution in different parts of the Weddell Gyre and water masses and serve as a baseline for future studies of pelagic community responses to climate change in the Southern Ocean.

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Spatial distribution of planktonic ciliates in waters around the northeastern Antarctic Peninsula and the South Orkney Plateau

Cited by 2 publications

References 50 publications

Seasonal acoustic presence of marine mammals at the South Orkney Islands, Scotia Sea

Seasonal acoustic presence of marine mammals at the South Orkney Islands, Scotia Sea

Summertime tintinnids in surface water of the Weddell and Cosmonaut seas: community structure and relationships with different water masses

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