The Polychaetes studied in this paper were collected during two scientific expeditions on board to the AGOR Vidal Gormaz (1995-96) from the Golfo de Penas...

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New records to Chile of the Family Paraonidae (Annelida: Polychaeta)

Helgoland Marine Research (2002)

Américo Montiel Brigitte Hilbig Nicol x E s Rozbaczylo

10.1007/s10152-002-0103-5

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Distribution patterns and biodiversity in polychaete communities of the Weddell Sea and Antarctic Peninsula area (Southern Ocean)

Journal of the Marine Biological Association of the United Kingdom (2006)

Brigitte Hilbig Dieter Gerdes Américo Montiel

During the expedition EASIZ II with RV ‘POLARSTERN’ in 1998 a multibox corer yielded 151 quantitative samples from 26 stations between 120 and 2415 m water depth for benthic community analysis. From this material a total of 235 polychaete species out of 37 families was determined. Forty-seven species are new to science. The polychaete fraction contributed 41.9% to total benthic abundance and 6.5% to total benthic biomass at these stations. Overall mean polychaete abundance (ind m −2 ) and biomass (g wet weight m −2 ) at the stations were 1617 and 49, respectively. Multidimensional scaling procedure clearly grouped the stations into south-eastern Weddell Sea shelf stations, deep-water stations, and stations mostly around the Antarctic Peninsula. Differences between these groups existed in terms of polychaete abundance and biomass as well as species composition, diversity, and evenness.

Benthos

Peninsula

Spionidae

10.1017/s0025315406013610

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Polychaete assemblages on the Magellan and Weddell Sea shelves: comparative ecological evaluation

Marine Ecology Progress Series (2005)

Américo Montiel D. W. Gerdes Brigitte Hilbig WE Arntz

MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 297:189-202 (2005) - doi:10.3354/meps297189 Polychaete assemblages on the Magellan and Weddell Sea shelves: comparative ecological evaluation A. Montiel1,2,*, D. Gerdes1, B. Hilbig3, W. E. Arntz1 1Alfred Wegener Institut für Polar- and Meeresforschung, Columbusstrasse, 27568 Bremerhaven, Germany2Laboratorio Hidrobiología, Instituto de la Patagonia, Universidad de Magallanes, Casilla 113 D, Punta Arenas, Chile3Ruhr-Universität Bochum, Universitätsstrasse 150, 44780 Bochum, Germany *Present address: Chile.*Email: amontiel@awi-bremerhaven.de ABSTRACT: Similarities between the soft-bottom polychaete assemblages on either side of the Drake Passage and spatial patterns of these assamblages were analysed based on data from 273 corer samples collected in the Magellan region (42 to 55°S, 254 m mean water depth) and on the Weddell Sea shelf (70 to 71°S, 263 m mean water depth). Paraonidae, Ampharetidae and Maldanidae were the most abundant families in the Magellan region, while in the Weddell Sea, Syllidae, Terebellidae and Spionidae were most abundant. The total species number found in the Magellan region (199) was higher than in the Weddell Sea (163), and significantly higher values of heterogeneity diversity, species richness and density were found in the Weddell Sea. At most of the Weddell Sea stations, all 3 trophic guilds (suspension feeders, detritus feeders and predators) were present, whereas suspension feeders were almost absent in the Magellan samples. The species abundance distribution showed a high number of species represented by only 1 specimen in both regions. This causes low dominance and similar high values of evenness in both regions. We suggest that the polychaete assemblage structures in both regions are influenced by environmental stress through ice and the physical complexity of the areas, which results in many different habitats. KEY WORDS: Polychaetes · Species composition · Diversity · Geographic distribution · Trophic guilds · Magellan region · Weddell Sea Full text in pdf format PreviousNextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 297. Online publication date: August 01, 2005 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2005 Inter-Research.

Spionidae

10.3354/meps297189

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Seasonal dynamics of meroplankton in a sub-Antarctic fjord (Southern Patagonia, Chile)

Polar Biology (2021)

Santiago E A Pineda-Metz Américo Montiel

Knowledge of seasonal dynamics and composition of meroplankton (larvae of benthic invertebrates) is rather limited for sub-Antarctic regions. We studied the seasonal dynamics of meroplankton in a sub-Antarctic proglacial basin (Gallegos Sound, Chile), by examining changes in the meroplankton community in relation to hydrographic variables along four sampling cruises between early winter 2010 and late winter 2011. The local meroplankton community was composed of 39 larval morphotypes distributed among 11 major taxa, being polychaetes the best represented (15 larvae morphotypes), and bivalve the most abundant. We found distinct seasonal differences in terms of meroplanktonic composition and abundance, with higher abundance and larval morphotype number during austral spring and late winter, and lower in summer and early winter. The pattern observed for meroplankton was directly related to seasonal variations of fluorescence of chlorophyll a and temperature. We found meroplankton abundances lower than those of other sub- and Polar environments. However, meroplanktonic temporal dynamics showed a common pattern for sub- and Polar fjords, suggesting a strong link between benthic spawning and the occurrence of phytoplankton blooms.The online version contains supplementary material available at 10.1007/s00300-021-02823-6.

Fjord

10.1007/s00300-021-02823-6

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