Seasonal variation of pelagic invertebrate larvae in the shallow antarctic waters of Admiralty Bay (King George Island)

Freire, Andrea S.; Absher, Theresinha Monteiro; Cruz-Kaled, Andrea Cancela da; Kern, Yargos; Elbers, Karin Lutke

doi:10.1007/s00300-005-0052-y

Cited by 23 publications

(43 citation statements)

References 28 publications

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“…Exceptions are: a 2 yr study by Stanwell-Smith et al (1999) at Signy Island, where 131 morphologically distinct larval forms were collected throughout the year, and a study of the distribution of pelagic larvae of benthic marine invertebrates in the Bellingshausen Sea, by Shreeve & Peck (1995), in which 16 larval and juvenile types, representing 7 phyla, were reported. Very recently, Freire et al (2006) reported seasonal variation in invertebrate larvae in Admiralty Bay in King George Island.…”

Section: Introductionmentioning

confidence: 99%

Distribution of meroplankton communities in the Bransfield Strait, Antarctica

Vázquez¹,

Ameneiro²,

Putzeys³

et al. 2007

Mar. Ecol. Prog. Ser.

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The spatial distribution of meroplankton in Bransfield Strait, Antarctica, and its relationships with hydrographical conditions are described. Biological sampling was carried out with BIONESS sampling gear at 19 stations and at 5 depths between 10 and 300 m. The main hydrographic features were a shallow hydrographic front in the southern part of the strait that separates Transitional Zonal Water with Bellingshausen influence (TBW) from Transitional Zonal Water with Weddell influence (TWW) and a slope front, the so-called Bransfield front, along the South Shetland Islands Slope (SSI). A northeastward baroclinic jet known as the Bransfield Current (BC) originates from this slope front. The meroplankton community was very diverse and included 12 types of larvae, dominated by polychaete and echinoderm larvae. The meroplankton were more abundant closer to the SSI in the BC and decreased in number towards the Antarctic Peninsula. Polychaete larvae were found close to both shores but mainly close to the SSI in TBW; they were very sparse in the central basin, appeared again below 100 m depth in TWW, and increased in abundance in upper layers at stations between the hydrographic front and the Antarctic Peninsula, in TWW. By contrast, echinoderm larvae mainly occupied the central basin and were always associated with the upper 100 m in TBW, just above the polychaete larvae; they were almost absent from TWW. In summary, meroplanktonic larval exhibit a strong dependence on water masses, depth, and fronts.

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Section: Introductionmentioning

confidence: 99%

Distribution of meroplankton communities in the Bransfield Strait, Antarctica

Vázquez¹,

Ameneiro²,

Putzeys³

et al. 2007

Mar. Ecol. Prog. Ser.

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“…Year-round (StanwellSmith et al 1999;Bowden et al 2009) and summer-early winter studies (Freire et al 2006) have shown that planktonic larvae from a variety of phyla are present during the winter months. Further, settlement and/or recruitment of Antarctic marine invertebrates occur throughout the year, with many taxa showing recruitment in the winter (Stanwell-Smith and Barnes 1997;Bowden 2005;Mincks and Smith 2007).…”

mentioning

confidence: 99%

Seasonal patterns in diversity and abundance of the High Antarctic meroplankton: Plankton sampling using a Ross Sea desalination plant

Sewell

Jury

2011

Limnology & Oceanography

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The Antarctic marine environment is thermally stable, yet shows pronounced seasonality in the light : dark cycle, primary productivity, and the extent of sea-ice cover. Thorson's Rule, predicting reduced meroplankton diversity at high latitudes, was based on the perceived difficulties in completing larval development at low temperatures and within the short summer period of phytoplankton production. Yet few studies have addressed seasonal patterns in Antarctic meroplankton diversity and abundance, especially in the High Antarctic. Here we circumvented logistical difficulties in conducting winter plankton sampling by using the 100-mm primary filter on the desalination plant at Scott Base in McMurdo Sound, Ross Sea (77u519S), to sample embryos and larvae. Using samples from an entire calendar year we found no seasonal changes in either embryo or larval operational taxonomic unit (OTU) diversity with season, no seasonal changes in embryo abundance (5000 L 21 ), but a peak in larval abundance during the period of the summer phytoplankton bloom (maximum 295 larvae 5000 L 21 ). While some OTUs showed a strong seasonality, there was also a high diversity of both embryos and larvae during the autumn and winter, and some OTUs were present in the meroplankton year-round. Annelids, molluscs, and echinoderms were dominant members of the Ross Sea meroplankton, showing similar prevalence to that seen at Signy (60u439S) and Adelaide Islands (67u34.59S). The use of the desalination plant primary filter allows plankton samples to be collected year-round, even in the High Antarctic with permanent sea-ice and 4 months of 24-h darkness.

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“…Due to the very slow development rate of larvae in Antarctic waters (Bosch et al, 1987;Peck 1993;Peck et al, 2007;Stanwell-Smith et al, 1999), differences among larvae from consecutive samples through time may be only successive stages in development of the same specie. Santos (1995) and Freire et al (2006) observed that Polychaeta larvae occurred at the beginning and end of summer. ese results are in accordance with what was observed in the present study, as Echinodermata and Polychaete larvae were detected in the beginning of summer as the first and second most abundant meroplankton respectively.…”

Section: Discussionmentioning

confidence: 99%

“…Freire et al (1993) and Santos (1995) studied the zooplankton of Admiralty Bay, Subsequent scienti c works by the Antarctic Brazilian program concentrated mainly in the meroplankton (Absher et. al., 2003;Freire et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

“…In Admiralty Bay, with the beginning of the austral summer (November-March), starts the supply of larvae or juveniles from the water column or sediment adjacent regions (Freire et al, 2006). The lower variability in temperature and salinity favor an environment with almost no barriers to larval dispersal however is limited by the type of reproduction.…”

Section: Introductionmentioning

confidence: 99%

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