Vertical distributions of a planktonic harpacticoid and a calanoid (Copepoda) in a meromictic Antarctic lake

Bayly, I. A. E.; Eslake, D.

doi:10.1007/978-94-009-2603-5_16

Cited by 10 publications

(5 citation statements)

References 6 publications

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“…The unidentified Laophontid maintains a benthic habit typical of harpacticoid copepods, whereas Amphiascoides sp. thrives in the suboxic zone at the boundary of the oxic and anoxic water of this meromictic lake (Bayly & Eslake 1989). Thus Amphiascoides sp.…”

Section: Paralabidocera Antarctica and Other Marine-derived Copepodsmentioning

confidence: 89%

New insights into the origins of crustaceans of Antarctic lakes

Gibson

Bayly

2007

Antarctic Science

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New evidence regarding the origins of the Crustacea of Antarctic lakes is reviewed. Palaeolimnological data indicates that the cladoceran Daphniopsis studeri has been present in Lake Reid, Larsemann Hills, for over 120 000 yr. This is the first direct evidence of a continental lacustrine refugium during the last glacial maximum. There are strong indications that the calanoid copepod Boeckella poppei maintained populations over the same period in lakes of the Amery Oasis, and the rapid post-glacial colonization by this species of newly formed lakes on the Antarctic Peninsula and Signy Island argues for a local rather than an extra-continental source. Evidence for the entry of marine-derived species into the longer term fauna of the continent is also presented. It is concluded that many of the Crustacea in Antarctic lakes are likely to have had a long association with the continent.

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Section: Paralabidocera Antarctica and Other Marine-derived Copepodsmentioning

confidence: 89%

New insights into the origins of crustaceans of Antarctic lakes

Gibson

Bayly

2007

Antarctic Science

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“…P. antarctica individuals were also encountered periodically in the lower, anaerobic monimolimnion. Copepods and cladocerans are able to withstand short periods of anoxia without ill effects (Tinson & Laybourn-Parry, 1985;Bayly & Eslake, 1989;Salonen & Lehtovaara, 1992) Therefore, it is likely that P. antarctica makes brief excursions into the anoxic waters of Ace Lake to exploit additional bacterial food resources. Our data indicate a summer grazing impact on phytoplankton species by P. antarctica.…”

Section: Discussionmentioning

confidence: 99%

E‐mail: J.Laybourn‐Parry@nottingham.ac.ukAnnual plankton dynamics in an Antarctic saline lake

Bell

Laybourn‐Parry²

1999

Freshwater Biology

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Summary 1. The plankton dynamics of Ace Lake, a saline, meromictic basin in the Vestfold Hills, eastern Antarctica was studied between December 1995 and February 1997. 2. The lake supported two distinct plankton communities; an aerobic microbial community in the upper oxygenated mixolimnion and an anaerobic microbial community in the lower anoxic monimolimnion. 3. Phytoplankton development was limited by nitrogen availability. Soluble reactive phosphorus was never limiting. Chlorophyll a concentrations in the mixolimnion ranged between 0.3 and 4.4 μg L−−1 during the study period and a deep chlorophyll maximum persisted throughout the year below the chemo/oxycline. 4. Bacterioplankton abundance showed considerable seasonal variation related to light and substrate availability. Autotrophic bacterial abundance ranged between 0.02 and 8.94 × 108 L−−1 and heterotrophic bacterial abundance between 1.26 and 72.8 × 108 L−−1 throughout the water column. 5. The mixolimnion phytoplankton was dominated by phytoflagellates, in particular Pyramimonas gelidicola. P. gelidicola remained active for most of the year by virtue of its mixotrophic behaviour. Photosynthetic dinoflagellates occurred during the austral summer, but the entire population encysted for the winter. 6. Two communities of heterotrophic flagellates were apparent; a community living in the upper monimolimnion and a community living in the aerobic mixolimnion. Both exhibited different seasonal dynamics. 7. The ciliate community was dominated by the autotroph Mesodinium rubrum. The abundance of M. rubrum peaked in summer. A proportion of the population encysted during winter. Only one other ciliate, Euplotes sp., occurred regularly. 8. Two species of Metazoa occurred in the mixolimnion; a calanoid copepod (Paralabidocera antarctica) and a rotifer (Notholca sp.). However, there was no evidence of grazing pressure on the microbial community. In common with most other Antarctic lakes, Ace Lake appears to be driven by ‘bottom‐up’ forces.

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“…its continuing presence would be valuable. Note that the anthomedusa (Rathkea lizzioides O'Sullivan, 1984) reported from the Vestfold Hills by Bayly (1986) and Bayly & Eslake (1989) together with a ctenophore that was found in Lake Burton are not included in this study. These are marine species that have only been found in Lake Burton, a meromictic saline lake with a salinity of 40+‰ (Dartnall 2000) and consequently are not within the "freshwater limitations" of this survey.…”

Section: Phylum: Poriferamentioning

confidence: 99%

The freshwater fauna of the South Polar Region: A 140-year review

Dartnall¹

2017

PPRST

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The metazoan fauna of Antarctic and sub-Antarctic freshwaters is reviewed. Almost 400 species, notably rotifers, tardigrades and crustaceans have been identified. Sponges, molluscs, amphibians, reptiles and fishes are absent though salmonid fishes have been successfully introduced on some of the sub-Antarctic islands. Other alien introductions include insects (Chironomidae) and annelid worms (Oligochaeta). The fauna is predominately benthic in habitat and becomes increasingly depauperate at higher latitudes. Endemic species are known but only a few are widely distributed. Planktonic species are rare and only one parasitic species has been noted.

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Vertical distributions of a planktonic harpacticoid and a calanoid (Copepoda) in a meromictic Antarctic lake

Cited by 10 publications

References 6 publications

New insights into the origins of crustaceans of Antarctic lakes

New insights into the origins of crustaceans of Antarctic lakes

E‐mail: J.Laybourn‐Parry@nottingham.ac.ukAnnual plankton dynamics in an Antarctic saline lake

The freshwater fauna of the South Polar Region: A 140-year review

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