|Community structure of intertidal boulder-cobble fields in the Straits of Magellan, Chile|
Ríos, C.; Mutschke, E. (1999). Community structure of intertidal boulder-cobble fields in the Straits of Magellan, Chile, in: Arntz, W.E. et al. (Ed.) Magellan-Antarctic: ecosystems that drifted apart. Scientia Marina (Barcelona), 63(Supl. 1): pp. 193-201
In: Arntz, W.E.; Ríos, C. (Ed.) (1999). Magellan-Antarctic: ecosystems that drifted apart. Scientia Marina (Barcelona), 63(Supl. 1). Institut de Ciències del Mar: Barcelona. 518 pp., more
In: Scientia Marina (Barcelona). Consejo Superior de Investigaciones Científicas. Institut de Ciènces del Mar: Barcelona. ISSN 0214-8358, more
Hemipodus simplex (Grube, 1857) [WoRMS]; Mytilus chilensis Hupé, 1854 [WoRMS]; Paramoera brachyura Schellenberg, 1931 [WoRMS]; Paramoera fissicauda (Dana, 1852) [WoRMS]; Perumytilus purpuratus (Lamarck, 1819) [WoRMS]; Ulva lactuca Linnaeus, 1753 [WoRMS]; Marine
Magellan region, diversity, intertidal zone, boulder-cobble beach, benthos
Based on quantitative samples taken along 4 transects in mobile hard-bottom intertidal areas of the Canal Whiteside, Magellan region, biotic composition, abundance and distribution patterns are described. The intertidal substrates, mainly formed by boulders and cobbles, represent highly heterogenous habitats from the structural point of view, and demonstrated a species richness higher than previously mentioned in some preliminary reports. Community structure parameters (abundance, species richness, diversity, and evenness) were not homogenous in the study areas, suggesting local dynamics. Differences in the vertical distribution of organisms were also found, suggesting changes of the zonation pattern along the beach profile. The macrofaunal assemblages were dominated by few species, with different specific compositions between transects. In general, representatives of Mollusca (Mytilus chilensis, Perumytilus purpuratus), Polychaeta (Hemipodus simplex), and Amphipoda (Paramoera fissicauda, P. brachyura, Transorchestia chilensis) were the numerically dominant groups. In terms of biomass, molluscs were highly dominant, mainly M. chilensis and P. purpuratus. Among the macroalgae, rhodophytes were the group with the highest presence, but Ulva lactuca (Chlorophyta) was the dominant species. In the upper sandy terrace, no macroorganisms were found. Several species found at Canal Whiteside have a wide circumpolar distribution in Sub-Antarctic regions.
- Antarctic, Sub-Antarctic and cold temperate echinoid database, more