Verena Häussermann

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Sea anemones (order Actiniaria) are among the most diverse and successful members of the anthozoan subclass Hexacorallia, occupying benthic marine habitats across all depths and latitudes. Actiniaria comprises approximately 1,200 species of solitary and skeleton-less polyps and lacks any anatomical synapomorphy. Although monophyly is anticipated based on(More)
Anthropogenic (aquaculture) changes in environment nutrient concentrations may affect phytoplankton (biomass and taxa composition) in marine coastal waters off the Chilean Patagonia. The effects of adding nitrate (NO₃(-)) to natural phytoplankton assemblages were evaluated considering biomass, cell abundance, and taxonomic composition. Microcosm experiments(More)
While large mass mortality events (MMEs) are well known for toothed whales, they have been rare in baleen whales due to their less gregarious behaviour. Although in most cases the cause of mortality has not been conclusively identified, some baleen whale mortality events have been linked to bio-oceanographic conditions, such as harmful algal blooms (HABs).(More)
During two scuba-diving expeditions in 2005 and 2006, stylasterids were documented and sampled from fjords and channels in the Central Patagonian Zone, Chile. At 15 of a total of 33 sampling sites we found colonies of Errina antarctica. We discuss the observed distribution patterns and the variability of colony shapes. In some regions we found E. antarctica(More)
A new species from Southern Patagonia, Isoparactis fionae sp. nov., is described. Isoparactis fionae sp. nov. differs from other species in the genus by having longitudinal rows of adherent rugae in the column, number of tentacles, cnidae and geographic distribution. We amend the generic position of the previously termed Paraisanthus fabiani (now(More)
A new species, Swiftia comauensis, is described from Chile. It occurs in shallow waters from 18 to 59 m in the Patagonian fjord region and seems to be endemic to the northern part of the region. The species is characterized by having straggly colonies with sparse branching and long drooping branches, prominent polyp mounds, and long, thin spindles; the(More)
The hydrocoral Errina antarctica is described around southern South America (south of 50 S; Fig. 1) and along the Scotia Arc down to 771 m (Cairns 1983). In Chile, we found E. antarctica in diving depths as far north as 43 25¢S. It has been identified as key structural species creating important habitats for a multitude of organisms (Häussermann and(More)
Mass spawning is well documented for many species of gamete-releasing scleractinians and for some species of actiniarians, but little information is available for corallimorpharians. Here, we report in situ observations of broadcast spawning of a corallimorpharian anemone. The benthos of Chilean Patagonian fjords is dominated by filter feeders and, below(More)
Verena Häussermann, Carolina S. Gutstein, Michael Bedington, David Cassis, Carlos Olavarria, Andrew C. Dale, Ana M. Valenzuela-Toro, Maria Jose Perez-Alvarez, Hector H. Sepúlveda, Kaitlin M. McConnell, Fanny E. Horwitz and Günter Försterra 1 Facultad de Ciencias Naturales, Escuela de Ciencias del Mar, Pontificia Universidad Católica de Valparaı́so,(More)
We describe a new genus and species of sea anemone from Chilean Patagonia. Anthoparactis fossii n. gen. et sp. adds another acontiate genus and species to the family Isanthidae Carlgren, 1938. Anthoparactis n. gen. differs from the other isanthid genera in having the same number of mesenteries distally and proximally, acontia with basitrichs only, and a(More)