Argentinean photographer Alejandro Chaskielberg has won the Sony World Photography Awards 2011.

Alejandro Chaskielberg

Picture: Alejandro Chaskielberg, courtesy Sony World Photography Awards 2011

Argentinean photographer Alejandro Chaskielberg has won the Sony World Photography Awards 2011.

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Alejandro, 34, fought off more than 100,000 entries to scoop the $25,000 cash prize and the coveted L?Iris D-Or.

His winning photos depict the lives of a community of islanders who live on the Panama River Delta.

?These carefully directed pictures tell solid truths- about toil and communality and marginal economic survival ? in a splendidly allusive way,? said Francis Hodgson, chair of the judging panel.

Alejandro, who spent two years living with the islanders for his ?High Tide? project, said: ?Using photography I have been able to present another version of the Panama River Delta and its community that has been photographically ignored throughout the years.?

The Buenos Aires-born photographer began his career as a photographer on a local newspaper aged 18.

Meanwhile, amateur photographer Chan Kwok Hung from Hong Kong triumphed in the Open category.

The 37-year-old jewellery maker landed a $5,000 cash prize along with a Sony DSLR for a dramatic image called ?Buffalo Race?, captured on a trip to Indonesia.

Renowned US photographer Bruce Davidson, 77, was presented with the Outstanding Contribution to Photography Award in a ceremony held at the Odeon, Leicester Square in London.

Louis Boulet from France won the Student Focus award.

Chan Kwok Hung, courtesy Sony World Photography Awards 2011

Picture: Chan Kwok Hung, courtesy Sony World Photography Awards 2011