Poliquetos Bentónicos Intermareales Y Sublitorales De La Región De Aisén, Chile

Abstract

Composition, abundance and richness of the intertidal and shallow subtidal (<30 metres) benthic polychaetes are presented. Several coastal fieldworks in fjords, channels and islands were undertaken between 2001 and 2003 in relationship with Biodiversity Aysen Project. 1.364 individuals and a total number of 76 taxa belonging to 30 families were recorded. The higher species richness was observed by Spionidae and Nereididae with nine and eight species respectively, with Platynereis australis (Schmarda, 1861) showing the highest dominance across overall sampling fieldworks. Specimens of Chrysopetalidae, Saccocirridae and Arenicolidae families are recorded for first time in the region, while another species increase their distribution range. The high species richness of some places (e.g. Kent Island) and some special oceanographic, environmental and geographic conditions suppose that diversity 'hotspots' have place at the Aisen region. A hypothesis is presented in terms of, some polychaetes species with high abundance and frequency in comparison to other invertebrates and specific environmental conditions where they live would allow developing a 'subiotope' in the studied coastal environmental. The 'subiotope' would be mainly defined by dominance of these polychaete species.

Molecular analysis and new records of the invasive polychaete Boccardia proboscidea (Annelida: Spionidae)

“…Blake & Kudenov (1978: 238), however, suggested that "his descriptions match those of B. tricuspa (Hartman), and his specimens should probably be referred to the latter species." Soto & Paterson (2010) reported B. proboscidea collected from the Región de Aisén, southern Chile, in 2002. However, we re-identified their specimens as Boccardia claparedei (Kinberg, 1866) based on the photos provided by the authors on our request (Soto in litt., 27 Nov 2018).…”

New reports and a new species of Syllidae (Annelida) from Chilean Patagonia

“…(in press) have summarized the knowledge of Syllidae in Chile. Moreover, the records of Syllidae in the Patagonian region of Chile (41°–55°S) are mainly related to ecological works indicating the presence of species for different localities such as Aysén fjord, Los Chonos Archipelago, Magellan Strait and Beagle Channel (Cañete et al ., 1999; Gambi & Mariani, 1999; Thatje & Brown, 2009; Soto & Paterson, 2010; Montiel et al ., 2011). Currently, 24 species of syllids have been reported in Chilean Patagonia showing that Syllis is the most diverse genus with eight species (San Martin et al ., in press).…”