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Factors influencing small-scale distribution of 10 macrolichens in King George Island,West antarctica

Advances in Polar Science 2012年第3期23卷 141-148页

作者： LIU Huajie WU Qingfeng FANG Shibo Key Laboratory of Microbial Diversity Research and Application of Hebei Province College of Life SciencesHebei UniversityBaoding 071002China Institute of Eco-environment and Agro-meteorology Chinese Academy of Meteorological SciencesBeijing 100081China

Lichens are among the main primary colonists in most terrestrial ecosystems of antarctica, where the effects of environmental factors on spatial distribution of lichens are essential to understanding the functioning of Antarctic terrestrial ecosystems. We measured abundance of 10 frequently observed macrolichens and 15 environmental factors at a small scale （20 cm× 20 cm）, in the ice-free areas of Fildes Peninsula and Ardley Island, King George Island, West antarctica, and assessed the effects of environmental factors on the local distribution of these lichens. Canonical correspondence analyses （CCA） show that 8 out of 15 environmental factors, belonging to 4 sets of variables, are important in spatial distribution of the 10 lichens. Variation partitioning analyses show that most of the variation in distribution of the 10 lichens is described by the spatial heterogeneity of substrate, bird influence and microclimate and topography, whereas human impact has no significant effects.

关键词： bird disturbance canonical correspondence analysis lichen ecology maritime antarctica soil accumulation

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Detection of integron integrase genes on King George Island, antarctica

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Advances in Polar Science 2015年第1期26卷 30-37页

作者： Verónica Antelo Héctor Romero Silvia Batista Unidad de Microbiología Molecular Biogem Instituto de Investigaciones Biológicas Clemente Estable (MEC) Departamento de Ecología y Evolución Facultad de Ciencias UDeLaR Montevideo C.P.11400 Uruguay

The presence and diversity of class 1 integrase gene （intl） sequences were evaluated by PCR using previously designed primers. Two clone libraries were constructed from DNA in sediment and microbial mat samples collected on Fildes Peninsula, King George Island, *** libraries constructed from samples collected at Halfthree Point （HP） and Norma Cove （NC） contained 62 and 36 partial intl sequences, respectively. These sequences clustered into 10 different groups with 〈 95% amino acid identity. Alignment of the deduced amino acid sequences with those from recognized integron-encoded integrases demonstrated the presence of highly conserved motifs characteristic of intl integrases. The HP library contained 42 nucleotide sequences identical to the class 1 intl gene found in a collection of trimethoprim-resistant （Tmpr） Antarctic Enterobacter sp. isolates, previously collected in the same area. These integrons, located on plasmids, had a genetic organization similar to that of pKOX105 from Klebsiella oxytoca. The 20 remaining HP and NC library sequences were similar to integrase sequences previously determined in a metagenomic analysis of environmental samples. We have demonstrated the presence of integron integrase genes in Antarctic sediment samples. About half these genes were very similar to the class 1 integrons found in human- associated microbiota, suggesting that they originated from human-dominated ecosystems. The remaining integrase genes were probably associated with endemic bacteria.

关键词： integrase amplicon library maritime antarctica

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