Temporal changes in zooplankton composition in a hypersaline, Antarctic lake subject to periodic seawater incursions

Eslake, D.; Kirkwood, Roger; Burton, Harry R.; Zipan, Wang

doi:10.1007/bf00014325

Cited by 10 publications

(3 citation statements)

References 7 publications

(10 reference statements)

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“…With the decrease in the marine influence, minimization of faunal assemblages occurred as biota depending on the immigration of larval stages into the basin could no longer continue their populations. A similar type of decrease in biodiversity has been reported from marine lakes formed by isostatic uplift in recent times (Ström and Klaveness 2003), and other seasonally isolated marine basins in the Vestfold Hills (Bayly 1986;Eslake et al 1991). The lake from the present study area shows the detachment of the lake from marine influence, which is probably linked with the glacial retreat in this area during ~5,000-5,500 yrs BP.…”

Section: Resultssupporting

confidence: 85%

A testimony of detachment of an inland lake from marine influence during the mid-Holocene in the Vestfold Hills region, East Antarctica

Mazumder¹,

Govil²,

Sharma³

et al. 2013

Limnological Review

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A 47 cm long sediment core collected from an inland lake of the Vestfold Hills, East Antarctica has been examined to reconstruct the palaeolacustrine environmental changes. The core shows dates at two core intervals of 18-19 cm and 28-29 cm as 5050±98 yrs BP and 5560±96 yrs BP, respectively. The core exhibits a good amount of diatom population throughout the length. Prior to 5560±96 yrs BP, the core shows high abundance of diatom population (>10×107 g-1) along with sufficient salt crystal, which indicates the connection of this lake with the marine environment. From 5560±96 yrs BP to 5050±98 yrs BP the total number diatoms decreased substantially along with the decrease in salt crystal, which indicates the withdrawal of the marine influence from the lake during that period. From 5050±98 yrs BP to Recent, the low number of diatoms and the rare occurrence of salt crystal suggest that the lake remained mostly detached from the sea during the last 5000 yrs.

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Section: Resultssupporting

confidence: 85%

A testimony of detachment of an inland lake from marine influence during the mid-Holocene in the Vestfold Hills region, East Antarctica

Mazumder¹,

Govil²,

Sharma³

et al. 2013

Limnological Review

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“…All copepod sequences we retrieved from the L'Atalante halocline are calanoids. Specifically this order includes numerous representatives that are adapted to survive and develop under high‐salt conditions (McKinnon and Kimmerer, 1985; Eslake et al ., 1991). It remains unknown to what extent different nutritional modes play a role in the trophic structure of this community.…”

Section: Discussionmentioning

confidence: 99%

Microbial eukaryotes in the hypersaline anoxic L'Atalante deep‐sea basin

Alexander

Stock

Breiner

et al. 2009

Environmental Microbiology

135

176

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The frontiers of eukaryote life in nature are still unidentified. In this study, we analysed protistan communities in the hypersaline (up to 365 g l(-1) NaCl) anoxic L'Atalante deep-sea basin located in the eastern Mediterranean Sea. Targeting 18S ribosomal RNA retrieved from the basin's lower halocline (3501 m depth) we detected 279 protistan sequences that grouped into 42 unique phylotypes (99% sequence similarity). Statistical analyses revealed that these phylotypes account only for a proportion of the protists inhabiting this harsh environment with as much as 50% missed by this survey. Most phylotypes were affiliated with ciliates (45%), dinoflagellates (21%), choanoflagelates (10%) and uncultured marine alveolates (6%). Sequences from other taxonomic groups like stramenopiles, Polycystinea, Acantharea and Euglenozoa, all of which are typically found in non-hypersaline deep-sea systems, are either missing or very rare in our cDNA clone library. Although many DHAB sequences fell within previously identified environmental clades, a large number branched relatively deeply. Phylotype richness, community membership and community structure differ significantly from a deep seawater reference community (3499 m depth). Also, the protistan community in the L'Atalante basin is distinctively different from any previously described hypersaline community. In conclusion, we hypothesize that extreme environments may exert a high selection pressure possibly resulting in the evolution of an exceptional and distinctive assemblage of protists. The deep hypersaline anoxic basins in the Mediterranean Sea provide an ideal platform to test for this hypothesis and are promising targets for the discovery of undescribed protists with unknown physiological capabilities.

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“…All these basins exhibit evidence of the marine influence, including higher nutrient concentrations than the generally oligotrophic lakes as aresult of input of relatively high nutrient marine water (J. Gibson, unpublished results), overwintering populations of mesozooplankton (Bayly 1986, Eslake et al 1991, and a greater diversity of phytoplankton species. The salinity of the SIMBs ranges up to 120 g 1-', indicating that net importation of salt into the basins has occurred during summer water exchange, and that isolation from the ocean is not required for formation of hypersaline waters.…”

Section: Lake or Marine Basinmentioning

confidence: 99%

The meromictic lakes and stratified marine basins of the Vestfold Hills, East Antarctica

Gibson

1999

Antartic science

101

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Thirty-four permanently stratified water bodies were identified in asurvey of the Vestfold Hills. Of these, 21 were lakes, six were seasonally isolated marine basins (SIMBs), and seven were marine basins with year round connection to the open ocean. The basins varied markedly in salinity (4 g I-' to 235 g 1-I), temperature (-14°C to 24"C), depth (5 m to 110 m), area (3.6 ha to 146 ha) and surface level (-30 m to 29 m above sea level).The stratification in all the basins was maintained by increases in salinity. During winter, a thermohaline convectidn cell was present in all lakes and SIMBs directly beneath the ice cover. These cells were the result of brine exclusion from the forming ice, and increased in density throughout winter, penetrating progressively deeper into the lake. Minimum stability, and therefore the maximum likelihood of turnover, occurred at the time of maximum ice formation in spring. At the end of the period of ice formation, the convection cell broke down, and stratification of the surface water occurred. When the ice melted completely, lenses of relatively fresh water capped the lakes, which reduced the effect of wind mixing. Net meltwater input increased the stability of the meromictic basins, while periods of lower water level resulted in deeper penetration of the thermohaline convection cell, increasing the possibility of turnover and destratification.

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Temporal changes in zooplankton composition in a hypersaline, Antarctic lake subject to periodic seawater incursions

Cited by 10 publications

References 7 publications

A testimony of detachment of an inland lake from marine influence during the mid-Holocene in the Vestfold Hills region, East Antarctica

A testimony of detachment of an inland lake from marine influence during the mid-Holocene in the Vestfold Hills region, East Antarctica

Microbial eukaryotes in the hypersaline anoxic L'Atalante deep‐sea basin

The meromictic lakes and stratified marine basins of the Vestfold Hills, East Antarctica

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