The general aspects of the distribution of Antarctic foraminifera

Mikhalevich, V. I.

doi:10.2113/50.2.179

Cited by 29 publications

(25 citation statements)

References 15 publications

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“…Both areas share surprisingly similar benthic foraminiferal assem− blages, and in both cases CDW intrusions seem to play an important role in shap− ing their present day environments Kirshner et al 2012). Thus, species that are well adapted to a wide range of Antarctic habitats may show supra−regional, circum−Antarctic distributions, the distribution pattern that has been already suggested for some benthic foraminiferal species around Antarctica (Mikhalevich 2004). …”

Section: Discussionmentioning

confidence: 66%

Benthic foraminifera from Pine Island and Ferrero bays, Amundsen Sea

Majewski¹

2013

Polish Polar Research

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Twenty one core tops from the central part of Pine Island Bay and nearby Ferrero Bay were collected in early 2010. They originate from a poorly studied area of the Amundsen Sea influenced at greater depths by relatively warm Circumpolar Deep Water. Almost all samples came from water−depths between 550 and 900 m and yield benthic foraminiferal assemblages of moderate variability with a significant decrease in calcareous forms with increasing water−depth. In total, 93 benthic taxa, belonging to 71 genera, are identified at the species level. They share a greater percentage of common species with the Ross Sea than with South Shetland Islands, most likely due to stronger climatic dissimilar− ity with the latter. Interestingly, the assemblages from Pine Island Bay, share the greatest numbers of taxa with assemblages described from Lützow−Holm Bay in East Antarctica, where the influence of Circumpolar Deep Water has been also recognized.

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Section: Discussionmentioning

confidence: 66%

Benthic foraminifera from Pine Island and Ferrero bays, Amundsen Sea

Majewski¹

2013

Polish Polar Research

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“…Similarly, Murray (2007) concluded that a high proportion (83%-90%) of species from marshes, lagoons/estuaries, and shelf seas were restricted to one or two of the six areas spanning either the three major oceans (marshes, lagoons/estuaries) or the eastern and western margins of the Atlantic Ocean (shelf seas). Mikhalevich (2004) estimates that as many as 80% of shallow-shelf (2-50 m) foraminiferal species around the Antarctic continent are endemic.…”

Section: Continental Shelf and Slopementioning

confidence: 99%

“…These endemic species, restricted to the Mediterranean and east Atlantic, support the concept of the Mediterranean as a hot spot for benthic foraminiferal evolution due to repeated anoxic episodes, at least since the beginning of the Pliocene (Verhallen 1991). According to Mikhalevich (2004), endemism among bathyal foraminiferal faunas in the Southern Ocean is "significant," as it is for many metazoan taxa (Brandt et al 2007). Species with apparently restricted geographical distributions also occur at depths between 200 and 2,000 m around New Zealand.…”

Section: Bathyal Seafloormentioning

confidence: 99%

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Benthic Foraminiferal Biogeography: Controls on Global Distribution Patterns in Deep-Water Settings

Gooday

Jorissen

2012

Annu. Rev. Mar. Sci.

108

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Benthic foraminifera, shell-bearing protists, are familiar from geological studies. Although many species are well known, undescribed single-chambered forms are common in the deep sea. Coastal and sublittoral species often have restricted distributions, but wide ranges are more frequent among deep-water species, particularly at abyssal depths. This probably reflects the transport of tiny propagules by currents across ocean basins that present few insurmountable barriers to dispersal, combined with slow rates of evolution. Undersampling of the vast deep-sea habitat, however, makes it very difficult to establish the ranges of less common foraminiferal species, and endemism may be more prevalent than currently realized. On continental slopes, some species have restricted distributions, but wide-ranging bathyal species that exhibit considerable morphological variation are more common. This may be linked to the greater heterogeneity of continental slopes compared with oceans basins. Improved knowledge of deep-sea foraminiferal biogeography requires sound morphology-based taxonomy combined with molecular genetic studies.

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“…As a result of these efforts, sufficient data exist for analyzing the biogeography of the most typical morphospecies. A broad distribution of some Antarctic morphospecies was suggested by some early foraminiferal workers (e.g., Earland 1934) and more recently confirmed by Mikhalevich (2004), who concluded that the majority of foraminiferal morphospecies on the Antarctic shelf have circumpolar distributions. The idea is based, however, exclusively on morphological studies, which have been shown to underestimate the true foraminiferal diversity revealed in many cases by genetic data (e.g., de Vargas et al 1999;Holzmann 2000;Pawlowski et al 2002bPawlowski et al , 2008Habura et al 2004).…”

Section: Introductionmentioning

confidence: 77%

Widespread intra-specific genetic homogeneity of coastal Antarctic benthic foraminifera

2015

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Benthic foraminifera are a major component of the Antarctic biota. Coastal foraminiferal morphospecies are widely distributed in Antarctic waters. The question is whether these morphotypes are genetically identical or, rather, they represent a cohort of cryptic species. Here, we compared genetically nine benthic foraminiferal morphospecies from Admiralty Bay (South Shetlands) and the western Ross Sea (McMurdo Sound, Terra Nova Bay), separated by a distance of *4500 km. Additionally, for three of these morphospecies, we included specimens from Rothera (Marguerite Bay), which is located between the two main areas of interest. Our study, based on SSU and ITS rDNA sequence data, shows that all examined morphospecies share the same genotypes despite the presence of considerable intra-individual genetic variability.

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The general aspects of the distribution of Antarctic foraminifera

Cited by 29 publications

References 15 publications

Benthic foraminifera from Pine Island and Ferrero bays, Amundsen Sea

Benthic foraminifera from Pine Island and Ferrero bays, Amundsen Sea

Benthic Foraminiferal Biogeography: Controls on Global Distribution Patterns in Deep-Water Settings

Widespread intra-specific genetic homogeneity of coastal Antarctic benthic foraminifera

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