Suprabenthic euphausiids and mysids from the South Shetland Islands and the Bransfield Strait, Southern ocean (BENTART-95 cruise)

Vicente, Carlos San; Ramos, A.; Sorbe, Jean Claude

doi:10.1007/s00300-005-0041-1

Cited by 10 publications

(3 citation statements)

References 21 publications

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“…Shortly after the publication by Siegel and Mühlenhardt-Siegel (1988), Parsons and Savard (1989) criticised the method of Macdonald and Pitcher (1979) as depending on starting parameters. Summer data, obtained by San Vicente et al (2006), show unimodal size-frequency distributions for juveniles and for immatures, whereby adults are rare in these samples.…”

Section: Life Cyclementioning

confidence: 76%

“…Size-frequency distributions are available for the congener M. posthon from hyperbenthic samples at diverse stations off the Antarctic Peninsula (Siegel and Mühlenhardt-Siegel 1988;San Vicente et al 2006). For winter data, Siegel and Mühlenhardt-Siegel (1988) obtained three size-groups by modal analysis according to Macdonald and Pitcher (1979) and interpreted these groups as annual age classes of a 3+ years life cycle.…”

Section: Life Cyclementioning

confidence: 99%

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First report of the order Mysida (Crustacea) in Antarctic marine ice caves, with description of a new species of Pseudomma and investigations on the taxonomy, morphology and life habits of Mysidetes species

Wittmann¹,

Chevaldonné²

2021

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SCUBA diving explorations of three islands off Dumont d’Urville Station at the coast of Adélie Land, East Antarctica, enabled the observation of marine ice caves. Sampling in this unusual habitat yielded a total of three species of Mysidae, altogether previously poorly known or unknown to science. Pseudomma kryotroglodytumsp. nov. is described, based on the structure of the antennal scale, telson and on cornea-like lateral portions set off against the main body of eyeplates. Mysidetes illigi is re-established at species level after almost a century in synonymy. Re-descriptions are provided for M. illigi and M. hanseni, based on types and ice cave materials. Keys to the Southern Ocean species of Pseudomma and to the world-wide species of Mysidetes are given. Phylogenetic trees are provided for the genera Pseudomma and Mysidetes. 18S rDNA sequences of P. kryotroglodytum differ from GenBank sequences of other Pseudomma species. First sequence data are given for species of the genus Mysidetes: 18S differs between the two examined species and COI is quite diverse between and within species. We found previously unknown, probably sensorial structures in these ice cave species: in P. kryotroglodytum, the basal segment of the antennula shows a pit-like depression with striated pad on the bottom and a median cyst, connected with the bottom of the eyeplate cleft. M. illigi shows a female homologue of the appendix masculina bearing a field of modified setae. Subsequent investigations demonstrated these structures also in species from other habitats. The feeding apparatus and stomach contents of the three ice cave species point to brushing of small particles (detritus, microalgae) from available surfaces, such as sediment, rock and the ice surface. Differences in the feeding apparatus are very subtle between the two Mysidetes species. The high content of fat bodies in M. hanseni could help it to survive periods of starvation. The large storage volume of the foregut in P. kryotroglodytum points to the collection of food with low nutritional quality and could help to balance strongly fluctuating food availability. Summer specimens of M. hanseni showed a bimodal frequency of developmental stages in the marsupium and bimodal size-frequency distribution of free-living stages. The females with younger brood (embryos) were, on average, larger and carried more marsupial young than those with older brood (nauplioid larvae). All examined incubating and spent females showed (almost) empty foreguts and empty ovarian tubes, suggesting possible semelparity and death following the release of young. The absence of juveniles and immature females from summer samples suggests that growth and accumulation of fat and yolk occur outside ice caves, while such caves could be used by fattened adults as shelter for brooding. A provisional interpretation proposes a biannual life cycle for M. hanseni, superimposed with shifted breeding schedules, the latter characterised by early breeding and late breeding females, probably in response to harsh physical and trophic conditions along the continental coast of Antarctica.

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Section: Life Cyclementioning

confidence: 76%

Section: Life Cyclementioning

confidence: 99%

First report of the order Mysida (Crustacea) in Antarctic marine ice caves, with description of a new species of Pseudomma and investigations on the taxonomy, morphology and life habits of Mysidetes species

Wittmann¹,

Chevaldonné²

2021

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“…Every layer has an opening of 80 cm width and 41 cm height. The sled is equipped with an opening closing-system activated by contact with the sea-floor (preventing contamination by pelagic organisms from the water column) (San Vicente et al 1997;San Vicente et al 2006). The sledge was hauled over the ground for 2-4 min at a mean velocity of 1.5-2 knots.…”

Section: Methodsmentioning

confidence: 99%

A new species of <i>Marumomysis</i> (Mysidacea: Mysidae: Erythropini) from the benthos of the Bellingshausen Sea (Southern Ocean)

Vicente¹

2007

Sci. Mar.

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SUMMARY: A new mysid species, Marumomysis antarctica n. sp., is described from specimens sampled with a suprabenthic sled in the Bellingshausen Sea (Southern Ocean). The new mysid is characterised by the small eyes lacking visual elements and with a long horn projecting anteriodorsally, the trilobate labrum and the shape and armature of the endopod of the uropod and telson. This new species is the first Marumomysis species described from the benthos (1320-1895 m depth) of the Southern Ocean.Keywords: taxonomy, Crustacea, Peracarida, Mysidae, Bellingshausen Sea, Antarctica.RESUMEN: UNA NUEVA ESPECIE DE MARUMOMYSIS (MYSIDACEA: MYSIDAE: ERYTHROPINI) DEL BENTOS PROFUNDO DEL MAR DE BELLINGSHAUSEN (OCÉANO AUSTRAL). -Una nueva especie de misidáceo, Marumomysis antarctica n. sp., se describe en base a los ejemplares muestreados con un trineo suprabentónico en el mar de Bellingshausen (Océano Austral). La nueva especie de misidáceo se caracteriza por poseer unos ojos pequeños, sin elementos visuales y provistos de un cuerno que se proyecta anterodorsalmente, un labro trilobado y la forma y armadura del endopodio del urópodo y del telson. Esta nueva especie es la primera del género Marumomysis descrita en el bentos profundo (1320-1895 m) del Océano Austral.

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Biodiversity and structure of the suprabenthic assemblages from South Shetland Islands and Bransfield Strait, Southern Ocean

Vicente¹,

Castelló

Corbera³

et al. 2007

Polar Biol

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Suprabenthic euphausiids and mysids from the South Shetland Islands and the Bransfield Strait, Southern ocean (BENTART-95 cruise)

Cited by 10 publications

References 21 publications

First report of the order Mysida (Crustacea) in Antarctic marine ice caves, with description of a new species of Pseudomma and investigations on the taxonomy, morphology and life habits of Mysidetes species

First report of the order Mysida (Crustacea) in Antarctic marine ice caves, with description of a new species of Pseudomma and investigations on the taxonomy, morphology and life habits of Mysidetes species

A new species of <i>Marumomysis</i> (Mysidacea: Mysidae: Erythropini) from the benthos of the Bellingshausen Sea (Southern Ocean)

Biodiversity and structure of the suprabenthic assemblages from South Shetland Islands and Bransfield Strait, Southern Ocean

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Suprabenthic euphausiids and mysids from the South Shetland Islands and the Bransfield Strait, Southern ocean (BENTART-95 cruise)

Cited by 10 publications

References 21 publications

﻿First report of the order Mysida (Crustacea) in Antarctic marine ice caves, with description of a new species of Pseudomma and investigations on the taxonomy, morphology and life habits of Mysidetes species

﻿First report of the order Mysida (Crustacea) in Antarctic marine ice caves, with description of a new species of Pseudomma and investigations on the taxonomy, morphology and life habits of Mysidetes species

A new species of <i>Marumomysis</i> (Mysidacea: Mysidae: Erythropini) from the benthos of the Bellingshausen Sea (Southern Ocean)

Biodiversity and structure of the suprabenthic assemblages from South Shetland Islands and Bransfield Strait, Southern Ocean

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First report of the order Mysida (Crustacea) in Antarctic marine ice caves, with description of a new species of Pseudomma and investigations on the taxonomy, morphology and life habits of Mysidetes species

First report of the order Mysida (Crustacea) in Antarctic marine ice caves, with description of a new species of Pseudomma and investigations on the taxonomy, morphology and life habits of Mysidetes species