Freshwater mollusks from three reservoirs of Piauí, northeastern Brazil

Abstract

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.

Malacofauna of lotic environments in the Northeast and Brazilian semiarid region: current knowledge and new records

“…For this reason, the distribution of B. straminea is the best known, with the largest number of records for both the Northeast and the semiarid regions. In the state of Piauí it has been registered in 66 municipalities (Carvalho et al 2008, Silva et al 2020b. Despite the existence of records of B. glabrata in the state (Paraense & Araujo 1984, Carvalho et al 2008, there are no reports of co-occurrence with B. straminea, according already been reported by Guimarães et al (2009) for other water bodies in the semiarid.…”

“…Despite its great diversity and importance in freshwater ecosystems from the semiarid region, these animals are poorly studied. Studies on this group in Brazilian semiarid are still incipient and do not emphasize its importance to regional biodiversity (Abílio et al 2006, Kotzian & Amaral 2013, 2020b.…”

Drástica Disminución De La Comunidad De Gasterópodos en El Refugio De Vida Silvestre Los Pantanos De Villa, Lima, Perú

“…M. tuberculata es una de las especies más abundantes en los humedales de Ventanilla (Vizcardo & Gil-Kodaka, 2015) y humedales de Puerto Viejo (59,36%) (Iannacone, et al, 2003); antes se ubicaba únicamente en las acequias laterales de Los Pantanos de Villa (Vivar et al, 1998), en la actualidad se la localiza en gran parte del humedal, inclusive constituyendo la dieta de Fulica ardesiaca Tschudi, 1843(Guillen & Morales, 2003. Su rápida propagación tiene sustento en su forma de reproducción (partenogénesis) (Vivar et al, 1990;Da Silva et al, 2020), longevidad (Pointier & McCullough, 1989) y plasticidad ecofenotípica (Ferrer et al, 1993-1994citado en Vivar et al, 1998, además se le ha atribuido la ingestión de huevos de Physella spp., en condiciones experimentales, como un efecto indirecto del pastoreo (Ladd & Rogowski, 2012); la otra especie introducida es P. trivolvis, originaria de América del Norte (Cordeiro & Pérez, 2017). No descartamos posible competencia interespecífica por partes de estas especies.…”

Current distribution of the invasive mollusk Corbicula fluminea (O.F. Müller, 1774) (Bivalvia, Cyrenidae) in Brazil, including a new record from the state of Piauí

“…The 200 km-long Itaim River belongs to the Parnaíba river basin and covers the municipalities of Paulistana, Patos do Piauí, Itainópolis, Santa Cruz do Piauí, Paquetá, and Oeiras. The collection area is located in the semiarid region of the country characterized by low rainfall, high evaporation rates, and high temperatures throughout the year (Ab'Sáber 2003; Silva et al 2020).…”