Rotifers, and other aquatic invertebrates, from the Larsemann Hills, Antarctica

Dartnall, Hjg

doi:10.26749/rstpp.129.17

Cited by 22 publications

(25 citation statements)

References 2 publications

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“…Both microfossil types were recovered from 114 to 56 cm, with the spermatophores present to 50 cm. No copepod microfossils were identified in the more recent sediments, which was consistent with the absence of copepods from Lake Reid today (Dartnall, 1995).…”

Section: Resultssupporting

confidence: 75%

“…The limited faunal surveys of Lake Reid have identified a faunal community of protozoans, two species of tardigrade, 12 rotifers and the cladoceran D. studeri (Dartnall, 1995). The copepod A. mirnyi , the only other crustacean recorded in the Larsemann Hills, has not been recorded from Lake Reid.…”

Section: Site Descriptionmentioning

confidence: 99%

“…, 2005). Currently, the lakes of the Larsemann Hills support communities comprising protozoans, helminthes, tardigrades, rotifers, nematodes and two crustacean species, the cladoceran Daphniopsis studeri Rühe, and the copepod Acanthocyclops mirnyi Borutsky & Vinogradov (Dartnall, 1995; Ellis‐Evans et al. , 1998).…”

Section: Introductionmentioning

confidence: 99%

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Evidence for a lacustrine faunal refuge in the Larsemann Hills, East Antarctica, during the Last Glacial Maximum

Cromer

Gibson

Swadling

et al. 2006

Journal of Biogeography

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Aim There is no previous direct evidence for the occurrence of lacustrine refuges for invertebrate fauna in Antarctica spanning the Last Glacial Maximum (LGM). In the absence of verified LGM lacustrine refuges many species are believed to result from Holocene dispersal from sub‐Antarctic islands and continents further north. If freshwater lake environments were present throughout the LGM, extant freshwater species may have been associated with Antarctica prior to this glacial period. This study looked at faunal microfossils in a sediment core from an Antarctic freshwater lake. This lake is unusual in that, unlike most Antarctic lakes, the sediment record extends to c. 130,000 yr bp, i.e. prior to the LGM. Location Lake Reid, Larsemann Hills, East Antarctica (76°23′ E; 69°23′ S). Methods Palaeofaunal communities in Lake Reid were identified through examination of faunal microfossils in a sediment core that extended to c. 130,000 yr bp. Results Ephippia and mandibles from the cladoceran Daphniopsis studeri and loricae of the rotifer Notholca sp. were found at all depths in the sediment, indicating that these two species have been present in the lake for up to 130,000 years. Copepod mandibles were also present in the older section of the core, yet were absent from the most recent sediments, indicating extinction of this species from Lake Reid during the LGM. Main conclusion The presence of D. studeri and Notholca sp. microfossils throughout the entire Lake Reid core is the first direct evidence of a glacial lacustrine refugium for invertebrate animals in Antarctica, and indicates the presence of a relict fauna on the Antarctic continent.

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Section: Resultssupporting

confidence: 75%

Section: Site Descriptionmentioning

confidence: 99%

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Evidence for a lacustrine faunal refuge in the Larsemann Hills, East Antarctica, during the Last Glacial Maximum

Cromer

Gibson

Swadling

et al. 2006

Journal of Biogeography

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“…However, this kind of continuous and usually intensive research is typically limited to one or few lakes. Expeditionary investigations focusing on rotifers from a variety of habitats include Africa (De Ridder, 1987;Segers et al, 1994), Anatolia (Segers et al, 1992), Antarctic (Dartnall & Hollowday, 1985;Dartnall, 1995), Arabia (Segers & Dumont, 1993a), Australia (Halse et al, 1998;Shiel et al, 2006), the Galápagos archipelago and Easter Island (De Smet, 1989;Segers & Dumont, 1993b), South America (Segers & Dumont, 1995), and Northwestern Canada (Chengalath & Koste, 1987).…”

mentioning

confidence: 98%

How well do single samples reflect rotifer species diversity? A test based on interannual variation of rotifer communities in Big Bend National Park (Texas, USA)

et al. 2007

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Studies of rotifer community composition and dynamics often rely on limited sampling regimes.To determine how well species richness is reflected in these studies, we examined interannual variation of rotifer species richness and monogonont community structure from 10 aquatic systems comprising four habitat types-springs, rock pools (tinajas), former cattle tanks, and artificial ponds-in Big Bend National Park (Texas, USA). Planktonic, littoral, and benthic samples were collected from all sites at about the same date for each of five summers (2001)(2002)(2003)(2004)(2005). Our survey yielded 15 monogonont families including 30 genera and 84 species. Two bdelloid taxa also were designated. Species richness varied widely among these four habitats: range, 1-32; mean (±1 SD), 11.2 ± 8.0. Total Species richness in the habitats also varied considerably: springs (54 taxa) > artificial ponds (35 taxa) > tinajas (19 taxa) > cattle tanks (15 taxa). Sessile species comprised &13% of the taxa in our samples. Species turnover indices (STI) of these systems indicate low overall relatedness: mean (±1 S.D.) = 85.2 ± 7.1%. The relative frequency of encounter of most taxa in the four systems was low, with 79 taxa (&92%) having values 2.0%. Singleton rates were quite high, ranging from 46.7 to 71.4%, with an overall mean &65.1%. Most importantly, we found that both species richness and STI varied considerably among habitat type. Species richness varied by 2-10· between consecutive years and STI ranged from 64 to 89% over the entire study. Our results indicate that rotifer community composition fluctuates greatly over time, and that rotifer community structure may be more labile than is generally believed. Species richness and thus biodiversity may be dramatically underestimated using single sampling or short-term strategies that are often employed in studies of zooplankton community structure.Keywords Biodiversity Á Chihuahuan Desert Á Index of faunal originality Á Invertebrate Á Relative frequency of encounter Á Singleton rate Á Species turnover index Á Sørensen index

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“…Parasitic species with their complicated life cycles are unknown in Antarctic and subantarctic freshwaters but two cercariae and a freshwater leech are present on the Falkland Islands. Of particular interest is the distribution of the copepod Diacyclops mirni which is absent on all of the Scotia Arc islands but present on the Antarctic continent, where it was originally described from the Bunger Hills (Borutski and Vinogradov 1957) and subsequently found in the Vestfold Hills (Korotkevich 1958;Borutski 1962;Dartnall 2000), and Larsemann Hills (Dartnall 1995).…”

Section: The Scotia Arcmentioning

confidence: 99%

A limnological reconnaissance of the Falkland Islands; with particular reference to the waterfleas (Arthropoda: Anomopoda)

Dartnall

Hollwedel²

2007

Journal of Natural History

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Forty-eight freshwater bodies on the Falkland Islands, including 33 lakes and pools, and 12 rivers and streams, were sampled for freshwater invertebrates. This study yielded 129 species of invertebrates (79 Rotifera, 34 Arthropoda, six Platyhelminthes, three Gastrotricha, two Nematoda, two Annelida, two Mollusca, and one Tardigrada) plus two fish species bringing the known Falkland Islands freshwater fauna to more than 170 species. While the presence of fishes, molluscs, amphipods, caddis larvae, waterboatmen, parasitic cercaria, and truly planktonic rotifers make the Falkland Islands fauna markedly richer than any subantarctic, or maritime Antarctic island, it is nevertheless sparse when compared with other temperate and tropical locations.

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Rotifers, and other aquatic invertebrates, from the Larsemann Hills, Antarctica

Abstract: Seventeen species of rotifer (11 Monogononta and six Bdelloidea), three tardigrades, two arthropods, as well as prorozoans, a plathyhclminth and nematodes were found in 13 freshwater lakes in the Larscmann Hills.

Cited by 22 publications

References 2 publications

Evidence for a lacustrine faunal refuge in the Larsemann Hills, East Antarctica, during the Last Glacial Maximum

Evidence for a lacustrine faunal refuge in the Larsemann Hills, East Antarctica, during the Last Glacial Maximum

How well do single samples reflect rotifer species diversity? A test based on interannual variation of rotifer communities in Big Bend National Park (Texas, USA)

A limnological reconnaissance of the Falkland Islands; with particular reference to the waterfleas (Arthropoda: Anomopoda)

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