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Benthic faunal associations on soft substrates at Potter Cove, King George Island, Antarctica
Ice impact seems to be the major regulating factor of benthic assemblages in shallow waters with a strong association of some species, mainly predators and opportunistic necrophages, with M. pedunculata. Expand
Climate change and glacier retreat drive shifts in an Antarctic benthic ecosystem
A marked shift in an Antarctic benthic community that can be linked to ongoing climate change is reported, and the resulting increased sediment runoff, triggered by glacier retreat, is highlighted as the potential causal factor. Expand
Genetic differentiation between morphotypes in the Antarctic limpet Nacella concinna as revealed by inter-simple sequence repeat markers
The results confirmed the morphological differences between intertidal and subtidal forms reported in other Antarctic localities and indicated that the two forms can be considered as genetically distinct populations maintaining low levels of gene flow. Expand
Food availability and gut contents in the ascidian Cnemidocarpa verrucosa at Potter Cove, Antarctica
The mechanism that provides food to the ascidians and epibenthic communities may be related to the supply of allochtonous particles, bottom resuspension events, and microbial community dynamics. Expand
A contribution to the understanding of phylogenetic relationships among species of the genus Octopus (Octopodidae: Cephalopoda)
A Bayesian approach was used to estimate as yet unknown phylogenetic relationships among O. tehuelchus from the southwestern Atlantic, new specimens of O. mimus (Chile and Peru) and other Octopus species, and used Bayes factors to test phylogenetic hypotheses. Expand
Ascidians (Tunicata, Ascidiacea) of Potter Cove, South Shetland Islands, Antarctica
High diversity and patchy distribution was found in less stringent environments, where epibiosis is a commmon phenomenon on stolidobranch ascidians, and differences in stalk development were found in the most abundant species Molgula pedunculata and Cnemidocarpa verrucosa. Expand
Ascidians (Tunicata, Ascidiacea): species distribution along the Scotia Arc
Affinity between the ascidian fauna of the Magellan region and the Antarctic is slightly stronger than was previously considered; there is also a species gradient along the Scotia Arc, which can be regarded as a bridge between the two regions. Expand
Reproductive ecology of the ascidian Cnemidocarpa verrucosa at Potter Cove, South Shetland Islands, Antarctica
It is suggested that winter time is not so stressful, in energetic terms, at least in the Potter Cove ecosystem, or that this ascidian species is able to store energy in some organs during favorable periods to later fuel reproduction, which is supported by the higher gonad production observed in 1997 compared to 1996, which coincided with higher levels of chl a that year. Expand
Climate change, glacier retreat and a new ice‐free island offer new insights on Antarctic benthic responses
The Antarctic Peninsula is among the places on Earth that registered major warming in the last 60 years. Massive ice losses, represented by glacier retreat, ice-shelf collapses and sea-ice reductionExpand
Diet components in the food of Antarctic ascidians living at low levels of primary production
Resuspension of benthic material due to wind mixing and the input of allochthonous particles by currents are important mechanisms that ensure food for ascidians and the community of suspension feeders in Potter Cove. Expand