Vol 13 Num 4




Diversity and distribution of mollusks along the Contas River in a tropical semiarid region (Caatinga), Northeastern Brazil

Carla Bender Kotzian

Universidade Federal de Santa Maria
Programa de Pós-graduação em Biodiversidade Animal, CEP 97105900, Santa Maria, RS, Brasil
email: modrizralok@hotmail.com

Aline Monique Blank do Amaral

Universidade Federal de Santa Maria
Pós-Graduação em Biodiversidade Animal, Avenida Roraima nº 1000, prédio 17, sala 1016, Camobi, 97105900, Santa Maria, RS

keywords
Neotropical region; Atlantic Forest; intermittent streams; invasive mollusks; Bahia

publication date: 12-02-2013





Abstract
An inventory of macroinvertebrates conducted in the Contas River basin in northeastern Brazil found 13 species of freshwater mollusks. Most of the community was represented by pulmonate gastropods, including Physa  acuta , Drepanotrema  anatinum , D.  cimex , D.  lucidum , Biomphalaria  straminea ?, Gundlachia  radiata ?, G.  ticaga  and Hebetancylus  moricandi ; the prosobranchs Pomacea  archimedis ?, Melanoides  tuberculata  and Littoridina  sp. were also found. Bivalves were less diversified, represented only by Pisidium  pulchellum ? and Eupera  simoni ?. The taxonomic composition and the small size of many species reflect the intermittent condition of the basin. Additionally, the occurrence of shells of five terrestrial species (Helicina  angulata , Gastrocopta  pellucida  hordeacella ?, Beckianum  beckianum , Succinea  sp. and Systrophiidae gen. et sp. indet.) in the rivers reflects the occasional heavy rainfalls and floods in the region. The invasive gastropod M.  tuberculata  was the most abundant and widely distributed species. All 13 species were found in the lower course, in the Atlantic Forest region, and most, but not all, were recorded in the upper course, in the Caatinga region. The distribution and the occurrence of the bivalve species exclusively in the Atlantic Forest region indicate that the locally higher annual precipitation provides favorable conditions for the survival of these mollusks, such as a more stable hydroperiod.

how to quote this paper
Kotzian, C. B. and Amaral, A. M. B. Diversity and distribution of mollusks along the Contas River in a tropical semiarid region (Caatinga), Northeastern Brazil. Biota Neotrop.  Oct/Dec 2013 vol. 13, no. 4 http://www.biotaneotropica.org.br/v13n4/en/abstract?inventory+bn03313042013 ISSN 1676-0603.

Cited species
check for this species in other resources Beckianum  beckianum 
check for this species in other resources Biomphalaria  straminea 
check for this species in other resources Drepanotrema  anatinum 
check for this species in other resources Drepanotrema  cimex 
check for this species in other resources Drepanotrema  lucidum 
check for this species in other resources Eupera  simoni 
check for this species in other resources Gastrocopta  pellucida  hordeacella 
check for this species in other resources Gundlachia  radiata 
check for this species in other resources Gundlachia  ticaga 
check for this species in other resources Hebetancylus  moricandi 
check for this species in other resources Helicina  angulata 
check for this species in other resources Littoridina 
check for this species in other resources Melanoides  tuberculata 
check for this species in other resources Physa  acuta 
check for this species in other resources Pisidium  pulchellum 
check for this species in other resources Pomacea  archimedis 
check for this species in other resources Succinea 



Fundação de Amparo | Pesquisa do Estado de São Paulo, Fapesp
Conselho Nacional de Desenvolvimento Científico e Tecnológico, CNPq
© BIOTA NEOTROPICA, 2013