Cheilostome bryozoan diversity from the southwest Atlantic region: Is Antarctica really isolated?

Figuerola, Blanca; Gordon, Dennis P.; Polonio, Virginia; Cristobo, Javier; Ávila, Conxita

doi:10.1016/j.seares.2013.09.003

Cited by 19 publications

(43 citation statements)

References 47 publications

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“…Polar ecosystems, by virtue of their low temperatures, are physically resistant to biological introductions and range expansions from lower latitudes (Freestone et al ., ). The Southern Ocean has traditionally been regarded as the most biologically isolated and invasion‐resistant ocean, because the Antarctic Circumpolar Current (ACC) spatially delimits it from other bodies of water, and because its very low sea temperatures require special physiological adaptations for survival and reproduction (Clarke et al ., ; Thatje, ; Aronson et al ., ; Convey et al ., ; Figuerola et al ., ). On the other hand, cold temperatures throughout the water column in many Antarctic locations have promoted eurybathy (Brey et al ., ; Brown & Thatje, ), and as a result high‐latitude taxa have expanded and contracted their depth ranges over geological time‐scales to track shifts in the availability of suitable habitat (Clarke et al ., ; Figuerola et al ., ).…”

Section: Climate Change and Community Structure In Antarcticamentioning

confidence: 97%

Prospects for the return of shell‐crushing crabs to Antarctica

Aronson

Frederich

Price

et al. 2014

Journal of Biogeography

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Rapidly rising sea temperatures off the western Antarctic Peninsula (WAP) are placing the Antarctic benthos at risk of increasing predation from durophagous (shell-breaking) brachyuran and anomuran crabs. Crabs are at present excluded from Antarctic-shelf environments by their limited capacity to down-regulate magnesium ions in their blood, a constraint that paralyses and kills them under cold conditions. Interspecific variation in the ability of Subantarctic crabs to flush out magnesium ions predicts which species should be capable of extending their ranges to shelf environments along the Antarctic Peninsula. In agreement with those predictions, the brachyuran Halicarcinus planatus was recently found in the shallow subtidal zone at Deception Island, an emergent volcanic cone located off the WAP. Geothermal activity at Deception Island provides a warm-water opportunity for persistence in a cold ocean, and heavy ship-traffic there could accelerate the delivery of non-native species. Large populations of anomuran king crabs (Lithodidae) have recently been discovered on the continental slope off the WAP, at ambient sea temperatures slightly warmer than the waters over the shelf. The lithodids are generalized, durophagous predators that could expand to shelf habitats as the overlying waters warm rapidly. Another brachyuran, the globally invasive, durophagous European green crab Carcinus maenas, also appears poised to expand to nearshore habitats in Antarctica. Successful expansion of predators and other benthic species to the Antarctic shelf would accelerate the global trend towards functional homogenization of the marine biota. Long-term monitoring programmes should be established immediately to assess the extent of the problem in Antarctica.

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Section: Climate Change and Community Structure In Antarcticamentioning

confidence: 97%

Prospects for the return of shell‐crushing crabs to Antarctica

Aronson

Frederich

Price

et al. 2014

Journal of Biogeography

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“…Furthermore, sampling efforts vary between target invertebrates (Fig. 1) independently of their abundance and distribution patterns (e.g., De Broyer et al, 2014;Figuerola et al, 2014;Moles et al, 2015). In the following section, we provide an update on the state of genetic diversity accounts and speciation patterns in Antarctica for the five marine invertebrate phyla that have been studied to date (see Table 1 for details).…”

Section: What Do We Know About the Genetic Diversity And Connectivitymentioning

confidence: 99%

Evolutionary patterns in Antarctic marine invertebrates: An update on molecular studies

2015

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“…areas south of the APF) faunas (Ekman 1953). The Magellan region in particular has been found to have strong biogeographical and evolutionary affinities with sub-Antarctic islands and the western Antarctic Peninsula shelf (Page & Linse 2002, Stankovic et al 2002, Figuerola et al 2014. Abyssal and bathyal faunas have also been identified as having similar patterns in adjacent deep ocean basins (Vinogradova 1997, Zezina 1997, O'Loughlin et al 2011.…”

Section: Introductionmentioning

confidence: 99%

Biogeographical patterns among deep sea megabenthic communities across the Drake Passage

Auscavitch

Waller

2017

Antarctic Science

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Biogeographical patterns among deep sea benthic communities in the Drake Passage remain poorly understood as a consequence of poor sampling resolution and the spatial remoteness of many sea floor features. Hard-bottom features, including at least 20 seamounts, remain uncharacterized with respect to their benthic megafaunal community assemblages. Here, we present community assemblage patterns from several locations across the Drake Passage to better understand the faunal relationships between deep sea floor communities in the region. Towed camera surveys were conducted on nine topographical features ranging from shelf environments on the southern Chilean Margin, the western Antarctic Peninsula shelf and seamounts in the central Drake Passage. These are the first quantitative measurements of megafaunal abundance at two seamount complexes in the central Drake Passage and multivariate analyses are used to examine the factors influencing species distributions. Three biogeographical groupings were identified based on species assemblages and environmental variables specific to major water mass boundaries in the region: sub-Antarctic Mode Water (318–523 m), Antarctic Intermediate Water (504–1128 m) and Circumpolar Deep Water (1837–3034 m). Further examination of megafaunal associations between sea floor structures may provide clues as to how sub-Antarctic communities are connected throughout the greater Southern Ocean.

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Cheilostome bryozoan diversity from the southwest Atlantic region: Is Antarctica really isolated?

Cited by 19 publications

References 47 publications

Prospects for the return of shell‐crushing crabs to Antarctica

Prospects for the return of shell‐crushing crabs to Antarctica

Evolutionary patterns in Antarctic marine invertebrates: An update on molecular studies

Biogeographical patterns among deep sea megabenthic communities across the Drake Passage

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