1 Innledning
1.2 Tidligere forskning
1) Os eventos extremos de chuvas torrenciais e secas severas, regidos pelo regime hidrológico da região do semiárido determinaram a disponibilidade de recursos no manancial, influenciando na mudança da composição e dominância de espécies de cianobactérias;
2) As condições de menor volume de água do reservatório foram favoráveis para o crescimento de espécies coloniais de cianobactérias, como Microcystis
panniformis e Sphaerocavum brasiliensis, que contribuíram para os maiores
valores de biomassa fitoplantônica;
3) As condições de entrada de fluxo de água dos tributários e extravasamento do reservatório contribuíram para diminuir a biomassa fitoplantônica e modificar as populações de cianobactérias, favorecendo a dominância de espécies filamentosas, como Cylindrospermopsis raciborskii, com estratégias adaptativas a essas condições;
4) As diferenças espaciais do reservatório influenciou a disponibilidade de luz, o qual afetou diretamente na estrutura e dinâmica de comunidades biológicas ao longo do eixo longitudinal.
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