Late-glacial and Holocene palaeoenvironmental change in the central Strait of Magellan, southern Patagonia

McCulloch, Robert; Davies, Sarah J.

doi:10.1016/s0031-0182(01)00316-9

Cited by 147 publications

(132 citation statements)

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“…This continuum in the distribution of species between the Pacific and Atlantic Oceans has been found in various groups of marine organisms, and is the main reason for asserting that the Magellan Province extends south from 40º-41ºS in the Pacific Ocean to approximately 30º-31°S in the Atlantic Ocean (Balech 1954, Briggs 1974. Several authors postulate that the opening of the Strait of Magellan 7000 years ago played an important role in the distribution and dispersal of species to create a corridor for the exchange of faunal elements between the two oceans (McCulloch andDavies 2001, Montiel et al 2005). In contrast, a low similarity (only 7%) was found between the echinoderm fauna from southern Brazil and the Magellan Province; Barboza et al (2011) postulated that this result suggests a clear turnover of species from the subtropical Brazil towards temperate areas, mainly at Uruguayan latitudes.…”

Section: Discussionmentioning

confidence: 99%

Species richness and distribution patterns of echinoderms in the southwestern Atlantic Ocean (34-56°S)

et al. 2014

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Summary:The aim of this study was to compile and analyse available historical information on echinoderms in the southwestern Atlantic Ocean in order to make a synthesis of present taxonomical knowledge, to identify patterns of geographical distribution of echinoderm assemblages and to test the validity of the current zoogeographic scheme for this group. This study was conducted on the Argentinean continental shelf, southwestern Atlantic Ocean (34-56°S). An intensive research on geo-referenced data was carried out to make a knowledge synthesis on echinoderm species and thus create a historical database. Multivariate analysis was used to analyse the faunal composition through latitudinal and bathymetric gradients as well as echinoderm associations. The results confirmed the existence of two faunal associations that correspond to the traditional zoogeographic scheme established for the Argentine Sea: the Argentinean and Magellan Provinces. The Argentinean Province had 46 widely distributed species. Of the 86 species recorded in the Magellan Province, a high percentage (25%) were also found in Antarctic waters, suggesting a strong connection between the echinoderm fauna of this province and the Antarctic Region. The species richness between 34 and 56°S in the Atlantic Ocean showed a significant increase in reference to latitude, with the highest values being recorded between 46 and 56°S. In view of the high percentage of shared species with Antarctica, considered a hot-spot region in terms of echinoderm diversity, the pattern of distribution of species richness observed in our study area could correspond to a dispersion of this species from Antarctic to sub-Antarctic regions.Keywords: biodiversity, biogeography, distribution patterns, echinoderm, species richness, southwestern Atlantic. Riqueza específica y patrones de distribución de equinodermos en el Atlántico Sudoccidental entre los 34 y 56ºSResumen: El objetivo de este estudio es recopilar y analizar la información histórica disponible sobre equinodermos en el Atlántico Sudoccidental, a fin de elaborar una síntesis del estado de conocimiento actual, identificar patrones de distribución geográfica de las comunidades de equinodermos y poner a prueba la validez del esquema zoogeográfico tradicionalmente establecido para el área de estudio. Este estudio se llevó a cabo en la Plataforma Continental Argentina entre los 34 y 56°S. Se efectuó una intensiva búsqueda de datos geo-referenciados sobre las especies de equinodermos, a fin de crear una base de datos histórica. Se utilizaron análisis multivariados para analizar cambios en la composición específica a través de gradientes latitudinales y batimétricos, así como también para reconocer y diferenciar las asociaciones de equinodermos en el área de estudio. Los resultados confirmaron la existencia de dos asociaciones faunísticas que responden al esquema zoogeográfico tradicionalmente establecido para el área de estudio, distinguiendo dos Provincias Biogeográficas: Argentina y Magallánica. La Provincia Argentina presen...

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Section: Discussionmentioning

confidence: 99%

Species richness and distribution patterns of echinoderms in the southwestern Atlantic Ocean (34-56°S)

et al. 2014

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“…The earliest incursions of seawater into the Straits of Magellan occurred by the end of deglaciation around 8 ky ago. It has been proposed that the Straits did not fully open until approximately 7 ky ago (McCulloch & Davies 2001). All present species in Magellan waters therefore recolonised this region from adjacent Atlantic and Pacific areas (Montiel et al 2005a).…”

Section: Introductionmentioning

confidence: 86%

The Macrobenthic Ecology of the Straits of Magellan and the Beagle Channel

Thatje

Brown

2009

Anales Instituto Patagonia (Chile)

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The macrobenthic community of the Straits of Magellan and the Beagle Channel was investigated using a Reineck box corer at 22 stations during the Chilean "Cimar Fiordo 3" expedition in 1997. A total of 173 taxa represented by 2188 individuals were identified and are reported for the investigated area. Clear exponential relationships with depth were revealed by analysis of abundance, biomass, species richness, and evenness. These patterns coincide with posited theories of pelagic-benthic coupling and the source-sink hypothesis of colonisation-extinction dynamics. Polychaeta dominated macrobenthic community abundance and biomass, 67% and 38% respectively, therefore consideration of biogeographic affinities concentrated on this taxon. 13 species of polychaetes observed in the study area co-occur in Antarctica suggesting biogeographic or evolutionary affinities between these adjacent regions.

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“…The maximum Holocene transgression has been dated at 7635 cal yr BP in Caleta Michilla (22°43') by Leonard and Wehmiller (1991), at 7325 cal yr BP in Bahía Tongoy (30°S) by Ota and Paskoff (1993), and at 7380 cal yr BP in Estrecho de Magallanes (southern Chile) by McCulloch and Davies (2001). Although the global evolution of the sea-level during the Holocene is controversial (see for example Tooley, 1993;Fleming et al, 1998;Lambeck and Chappel, 2001), different authors have identified in several parts of the world a maximum Holocene high-stand that took place between approximately 6000 to 8000 yr BP (e.g., Tooley, 1993;Codignotto and Aguirre, 1993;Bezerra et al, 1998;Rostami et al, 2000;Dabrio et al, 2000) and it is coincidental with the cited values for the highest Holocene stand in Chile.…”

Section: Resultsmentioning

confidence: 99%

Finding of a Holocene marine layer in Algarrobo (33°22'S), central Chile. Implications for coastal uplift

Encinas¹,

Hervé²,

Villa-Martínez³

et al. 2010

andgeo

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A buried Holocene marine bed was discovered upon drilling a water well in Algarrobo (33°22'S), located on the coast of central Chile. Radiocarbon dating of a wood fragment found within the deposit indicates an age of 6450 cal yr BP. The top of this bed, 0.25 m-thick, was reached at an elevation of 3.8 m above mean sea level. This bed contains abundant monospecific faunas of foraminifers (Ammonia tepida) and ostracodes (Cyprideis beaconensis), indicative of deposition in a very shallow, transitional marine environment. Palynologic analysis reveals a Chenopodiaceae-dominated (~70%) assemblage, indicating a relatively arid and warm climate.

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Late-glacial and Holocene palaeoenvironmental change in the central Strait of Magellan, southern Patagonia

Cited by 147 publications

References 30 publications

Species richness and distribution patterns of echinoderms in the southwestern Atlantic Ocean (34-56°S)

Species richness and distribution patterns of echinoderms in the southwestern Atlantic Ocean (34-56°S)

The Macrobenthic Ecology of the Straits of Magellan and the Beagle Channel

Finding of a Holocene marine layer in Algarrobo (33°22'S), central Chile. Implications for coastal uplift

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