Abstract:Through application of carbon (C) and nitrogen (N) stable isotope analyses, we investigated the benthic trophic structure of the upper-slope off southern Chile (~45°S) including a recent methane seep area discovered as part of this study. The observed fauna comprised 53 invertebrates and seven fish taxa, including remains of chemosymbiotic fauna (e.g. chemosymbiotic bivalves and siboglinid polychaetes), which are typical of methane seep environments. While in close-proximity to a seep, the heterotrophic fauna … Show more
“…In this study, we review the occurrence records of coral species inhabiting diverse habitats in the marine and coastal waters of Chile to determine species richness and distribution (both geographic and bathymetric), and to identify spatial and temporal trends in the data. To do this, we complied the data reported by previous studies of corals in the region including those by Reyes-Bonilla (2002), Cairns et al Communicated by S. Gollner (2005), Alarcón Delgado (2009), and Häussermann andFörsterra (2007b, 2009), as well as more recent studies that focus on habitats in coastal or shallow waters, on the continental slope or seamounts, and around oceanic islands (e.g., Zapata-Guardiola and López-González 2010;McFadden and van Ofwegen 2013;Breedy et al 2015;Araya et al 2017;Gorny et al 2018;Hoeksema et al 2019) or methane seeps (Sellanes et al 2008;Zapata-Hernández et al 2014a, 2014b. According to these data, and other resources on coral biodiversity and distribution around Chile, including the continental shelf and slope, oceanic islands (i.e., Juan Fernández Archipelago, Desventuradas Islands, Salas y Gómez islet, and Rapa Nui), and oceanic ridges (i.e., Juan Fernández, Nazca and Salas y Gómez), there are significant knowledge gaps in the data that need to be filled in order to support efficient conservation plans that protect and promote the marine biodiversity of Chile.…”
The present review investigates our current knowledge of the richness and distribution of coral species inhabiting diverse habitats in Chilean coastal and marine waters, including the oceanic islands. Information, such as the spatial-temporal coverage, taxonomic resolution, and bathymetry of species, was extracted from published articles, geodatabases, and unpublished data. Our analyses of these data highlight major gaps in knowledge on corals in Chile, indicating this region remains poorly studied. The results show that the previous studies focused mostly on coastal and shallow-water habitats, with the continental slope, oceanic islands, and seamounts remaining mainly unexplored. Furthermore, high coral species richness was observed in the Magellanic Province compared with the northern Intermediate Area and Peruvian Province, and the temporal distribution of occurrence records was discontinuous, with peaks observed for the years 1876–1877, 1960–1967, and 2001–2016. We also report a new location and an extension of the known geographic distribution for Bathycyathus chilensis. Despite the progress in scientific knowledge achieved in the last decades, coral research still suffers from significant knowledge gaps, especially of the deep-sea benthic biodiversity in Chile. Further exploration of Chilean coastal and marine waters is therefore necessary to increase the knowledge of the coral biodiversity of this vast region.
“…In this study, we review the occurrence records of coral species inhabiting diverse habitats in the marine and coastal waters of Chile to determine species richness and distribution (both geographic and bathymetric), and to identify spatial and temporal trends in the data. To do this, we complied the data reported by previous studies of corals in the region including those by Reyes-Bonilla (2002), Cairns et al Communicated by S. Gollner (2005), Alarcón Delgado (2009), and Häussermann andFörsterra (2007b, 2009), as well as more recent studies that focus on habitats in coastal or shallow waters, on the continental slope or seamounts, and around oceanic islands (e.g., Zapata-Guardiola and López-González 2010;McFadden and van Ofwegen 2013;Breedy et al 2015;Araya et al 2017;Gorny et al 2018;Hoeksema et al 2019) or methane seeps (Sellanes et al 2008;Zapata-Hernández et al 2014a, 2014b. According to these data, and other resources on coral biodiversity and distribution around Chile, including the continental shelf and slope, oceanic islands (i.e., Juan Fernández Archipelago, Desventuradas Islands, Salas y Gómez islet, and Rapa Nui), and oceanic ridges (i.e., Juan Fernández, Nazca and Salas y Gómez), there are significant knowledge gaps in the data that need to be filled in order to support efficient conservation plans that protect and promote the marine biodiversity of Chile.…”
The present review investigates our current knowledge of the richness and distribution of coral species inhabiting diverse habitats in Chilean coastal and marine waters, including the oceanic islands. Information, such as the spatial-temporal coverage, taxonomic resolution, and bathymetry of species, was extracted from published articles, geodatabases, and unpublished data. Our analyses of these data highlight major gaps in knowledge on corals in Chile, indicating this region remains poorly studied. The results show that the previous studies focused mostly on coastal and shallow-water habitats, with the continental slope, oceanic islands, and seamounts remaining mainly unexplored. Furthermore, high coral species richness was observed in the Magellanic Province compared with the northern Intermediate Area and Peruvian Province, and the temporal distribution of occurrence records was discontinuous, with peaks observed for the years 1876–1877, 1960–1967, and 2001–2016. We also report a new location and an extension of the known geographic distribution for Bathycyathus chilensis. Despite the progress in scientific knowledge achieved in the last decades, coral research still suffers from significant knowledge gaps, especially of the deep-sea benthic biodiversity in Chile. Further exploration of Chilean coastal and marine waters is therefore necessary to increase the knowledge of the coral biodiversity of this vast region.
“… 6 showed evidence that the heat flow is much greater south of the Darwin FZ than those indirect measurements to the north, reaching peak values of almost 300 mW/m 2 at the seaward end of the seismic profile RC2901-745, where the eastern flank of the CR is today subducting. In the study area, maximum values occur at the toe of the accretionary prism, where active deformation 23 , and vigorous fluid flow, such as cold seeps, occur 46 , 47 . Figure 2 Database map: ( a ) Locations of the new single-channel seismic profiles (bold letters, purple lines) and heat probes measurements (black stars) showed in this study.…”
The Chile Triple Junction, where the hot active spreading centre of the Chile Rise system subducts beneath the South American plate, offers a unique opportunity to understand the influence of the anomalous thermal regime on an otherwise cold continental margin. Integrated analysis of various geophysical and geological datasets, such as bathymetry, heat flow measured directly by thermal probes and calculated from gas hydrate distribution limits, thermal conductivities, and piston cores, have improved the knowledge about the hydrogeological system. In addition, rock dredging has evidenced the volcanism associated with ridge subduction. Here, we argue that the localized high heat flow over the toe of the accretionary prism results from fluid advection promoted by pressure-driven discharge (i.e., dewatering/discharge caused by horizontal compression of accreted sediments) as reported previously. However, by computing the new heat flow values with legacy data in the study area, we raise the assumption that these anomalous heat flow values are also promoted by the eastern flank of the currently subducting Chile Rise. Part of the rift axis is located just below the toe of the wedge, where active deformation and vigorous fluid advection are most intense, enhanced by the proximity of the young volcanic chain. Our results provide valuable information to current and future studies related to hydrothermal circulation, seismicity, volcanism, gas hydrate stability, and fluid venting in this natural laboratory.
“…Presence of larvae of unidentified Coelorinchus in zooplankton samples nearby from Penas Gulf (Balbotin, 2006) may suggest that the comparable shallow interior waters around the Campana Archipelago could represent a recruitment area for population of macrourids that live offshore since north of the Penas Gulf juveniles of C. fasciatus occur in the interior waters (Pequeño & Riedemann, 2006), whereas the adults live on the upper slope off the continent (Zapata-Hernández et al 2014).…”
Sobre las distribuciones batimétricas y latitudinales de Coelorinchus cf. cookianus (Gadiformes: Macrouridae): primer registro documentado con un vehículo operado remotamente (ROV) en aguas interiores del Archipiélago Campana en la Patagonia central, Chile (48° S
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