id	keyword
american_scientific_journal-3361	zambezi
american_scientific_journal-3361	lake
american_scientific_journal-3361	kariba
american_scientific_journal-3361	species
american_scientific_journal-3361	river
american_scientific_journal-3361	zambezi river
american_scientific_journal-3361	zambezi valley
american_scientific_journal-3361	lake kariba
american_scientific_journal-3361	downstream
american_scientific_journal-3361	habitats
american_scientific_journal-3361	upstream