Melanoides tuberculata (Müller, 1774) was recorded during field surveys of the malacofauna of Território Vale do Guaribas in Piauí state, northeastern Brazil. Individuals were observed every month (June 2017–September 2018) in both lotic and lentic habitats. Considering that M. tuberculata has high reproductive and adaptative capacities besides being an intermediate host of digenetic trematodes, this invasive species is expected to be a threat to native biodiversity. Furthermore, it may become a serious environmental problem considering the multiple uses of the water bodies where it lives.
The pronounced dry season determines the characteristics of the semiarid region of Brazil. Numerous small reservoirs are built to overcome this condition, accumulating multiple uses and causing important changes in the landscape and the local biota. Considering the limited amount of information about the malacofauna of reservoirs, mainly in the Northeast region of the country, this inventory provides a list of mollusks from three important reservoirs located in the city of São Julião, state of Piauí. The collections were carried out monthly between May/2017 and April/2018, sampling a total of 11,149 mollusks, corresponding to the species Melanoides tuberculata (Müller, 1774) (n = 9,724), Biomphalaria straminea (Dunker, 1848) (n = 1,361) and Pomacea lineata (Spix, 1827) (n = 64). The richness of mollusks from the three reservoirs was low, similar to those described in studies conducted in other regions of Northeast Brazil. There was a significant difference in the abundance of M. tuberculata and B. straminea among the studied reservoirs. These environments are not connected and are installed in urban and rural areas, presenting different ecological conditions. The relationship between the human population and the reservoirs, associated with the lack of sanitation, increases the risks of spreading waterborne diseases besides the development of environmental imbalance by the introduction of exotic species.
Uma maneira efetiva de registrar a qualidade dos ecossistemas é o uso de Protocolo de Avaliação Rápida (PAR). Este instrumento possibilita a identificação das principais alterações na dinâmica temporal dos ambientes. Com isso, este trabalho teve como objetivo adaptar e aplicar um PAR em açudes da região semiárida para estabelecimento do seu estado de conservação. O PAR foi executado mensalmente entre os meses de outubro de 2017 e setembro de 2018, em três açudes do município de São Julião, Piauí. O estado de conservação dos açudes avaliados variou entre condição natural a alterações reduzidas. Foi possível verificar que as alterações nas características dos corpos d’água foram provocadas tanto pelo volume da precipitação quanto decorrentes de ações antrópicas. O PAR é uma ferramenta funcional que permite a avaliação da dinâmica de açudes do semiárido possibilitando o detalhamento mensal das situações ambientais bem como quais fatores contribuíram para as alterações.
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