Estivação de Biomphalaria tenagophila (Pulmonata, Planorbidae)

Teles, Horacio Manuel Santana; Marques, Cristiano Correa de Azevedo

doi:10.1590/s0034-89101989000100010

Cited by 9 publications

(8 citation statements)

References 3 publications

(1 reference statement)

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“…It is known that freshwater snails of the genus Biomphalaria, intermediate hosts of Schistosoma mansoni, are tolerant to anoxia exposure, starvation, and desiccation/estivation (Richards 1967;Sturrock 1970;Vianey-Liaud and Lancastre 1986;Teles and Marques 1989;Ohlweiler and Kawano 2001). Other studies have also described the metabolic adjustments that are made under these conditions (Becker 1983;Patience et al 1983;Meyer et al 1986;Wolmarans 1987;Thompson and Mejiascales 1993;Bezerra et al 1999).…”

Section: Introductionmentioning

confidence: 99%

Role of antioxidant defenses during estivation and anoxia exposure in the freshwater snailBiomphalaria tenagophila(Orbigny, 1835)

Ferreira¹,

Alencastro²,

Hermes‐Lima³

2003

Can. J. Zool.

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The effects of 24 h of exposure to underwater anoxia and 15 days of estivation (at 2627°C) on the enzymatic antioxidant system of the hepatopancreas of the freshwater snail Biomphalaria tenagophila (Planorbidae) are described. The effect of 24 h of recovery was also investigated. Catalase activity dropped by 31% during 24 h of anoxia, and superoxide dismutase (SOD) activity was reduced by 43% during the 15 days of estivation. This is consistent with the overall decrease in metabolic rate during estivation or anoxia. Indeed, the heartbeat diminished by 2836% during estivation (determination was possible for only 4 days) and by 66% after 24 h of anoxia. On the other hand, selenium-dependent glutathione peroxidase (Se-GPX) activity increased during anoxia (from 10 to 14 mU/mg protein) and estivation (by 14%). Glutathione S-transferase (GST) and glutathione reductase activities remained unchanged during estivation and anoxia. Glucose 6-phosphate dehydrogenase activity was unchanged during estivation and recovery. Recovery restored SOD activity. Catalase, Se-GPX, and GST activities during recovery were significantly lower than those of the respective controls. Lipid peroxidation, determined as the level of thiobarbituric acid-reactive substances, was unchanged in the hepatopancreas after 15 days of estivation and 26 h of recovery from estivation. It is possible that the increase in Se-GPX activity during anoxia and estivation, and the maintenance of GST activity, are relevant in minimizing the effects of reactive oxygen species that can be formed upon resumption of aerobic metabolism. Thus, B. tenagophila may have a biochemical strategy of preparation for oxidative stress such as that observed in several other species of anoxia/hypoxia-tolerant animals.

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Section: Introductionmentioning

confidence: 99%

Role of antioxidant defenses during estivation and anoxia exposure in the freshwater snailBiomphalaria tenagophila(Orbigny, 1835)

Ferreira¹,

Alencastro²,

Hermes‐Lima³

2003

Can. J. Zool.

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“…Other pulmonates found in the Contas basin (Drepanotrema and Ancylidae), although not widely distributed in the river, have also been recorded in lentic environments, with weak water current and prone to drying (Bonetto et al 1982, Lanzer 1996, Abílio et al 2006. Studies on some species of Drepanotrema show that they are also capable of tolerating dry and anoxic periods (Teles & Marques 1989).…”

Section: Discussionmentioning

confidence: 99%

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

Kotzian

Amaral

2013

Biota Neotrop.

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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. Resumo: Treze espécies de moluscos de água doce foram encontradas em um inventário de macroinvertebrados realizado ao longo da bacia do Rio de Contas, no Nordeste do Brasil. A maioria da comunidade foi representada por gastrópodes pulmonados, como Physa acuta, Drepanotrema anatinum, D. cimex, D. lucidum, Biomphalaria straminea?, Gundlachia radiata?, G. ticaga e Hebetancylus moricandi, embora prosobrânquios, como Pomacea archimedis?, Melanoides tuberculata e Littoridina sp. também tenham sido encontrados. Bivalves foram menos diversificados, e foram representados por Pisidium pulchellum? e Eupera simoni?. A composição taxonômica e o pequeno tamanho alcançado por muitas espécies refletem a condição intermitente da bacia. Além disso, a ocorrência de conchas de cinco espécies terrestres (Helicina angulata, Gastrocopta pellucida hordeacella?, Beckianum beckianum, Succinea sp. e Systrophiidae gen. et sp. indet.) dentro dos rios reflete as fortes chuvas e inundações que ocorrem ocasionalmente na região. O gastrópode invasor M. tuberculata foi a espécie mais abundante e bem distribuída. Todas as espécies foram encontradas no curso inferior, na região da Mata Atlântica, e a maioria, mas não todas, foram registradas no curso superior, na região da Caatinga. Esta distribuição e a ocorrência das espécies de bivalves exclusivamente na região da Mata Atlântica indicam que a maior precipitação anual desta região fornece condições favoráveis para a sobrevivência destes moluscos, como um hidroperíodo mais estável. Palavras-chave: Região Neotropical, Mata Atlântica, rios intermitentes, moluscos invasores, Bahia.

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“…The majority of the genera observed (pulmonate gastropods) are able to deal with long term hypoxia (Brown, 2001). The aestivation process was observed in several species of Biomphalaria, Drepanotrema and Lymnaea columella, including B. tenagophila (Teles and Marques, 1989) in Brazil. Many bivalve populations are restricted to shallow waters and susceptible to droughts or dry periods.…”

Section: Discussionmentioning

confidence: 99%

Responses of freshwater molluscs to environmental factors in Southern Brazil wetlands

et al. 2010

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Freshwater molluscs play an important role in aquatic ecosystems, providing food for many fish species and vertebrates. Investigations on factors that determine mollusc species richness and distribution in wetland systems are scarce in the Neotropical region. The main goal of this study was to determine how much variation in mollusc richness and composition is explained by area, hydroperiod, altitude, water conductivity, and dominant aquatic vegetation. This survey was performed in an extensive area of a Neotropical region (~280,000 km 2 in southern Brazil), with a large number of wetland systems (111) and covering a wide gradient of altitude and wetland surface area. The mollusc richness was positively associated with wetland area and negatively associated with altitude. The richness and composition of the freshwater molluscs were similar between permanent and intermittent wetlands and it did not differ significantly between aquatic bed and emergent wetlands. The first three axes of CCA explained 16.2% of the total variation in the composition of the freshwater mollusc observed. The variation in the composition had a correlation with wetland area, altitude and water conductivity. Our results showed that the wetlands are important habitats for molluscs in southern Brazil, and that the richness and the composition of molluscs were associated with area, altitude, water conductivity and dominant vegetation.Keywords: wetland area, altitude, hydroperiod, aquatic vegetation, neotropical region. Respostas de moluscos límnicos a fatores ambientais em áreas úmidas do sul do Brasil ResumoMoluscos límnicos desempenham um papel importante em ecossistemas aquáticos, fornecendo alimento para diversos peixes e vertebrados. Investigações sobre os fatores que determinam a riqueza e a distribuição das espécies de moluscos em áreas úmidas são escassos na região neotropical. O principal objetivo deste estudo foi determinar a variação na riqueza e na composição de moluscos em função da área, hidroperíodo, altitude, condutividade da água e tipo de vegetação aquática dominante. Este estudo foi desenvolvido em uma extensa área Neotropical (~280.000 km 2 no sul do Brasil), com um elevado número de áreas úmidas (111) e compreendeu um amplo gradiente de altitude e tamanho de áreas úmidas. A riqueza de moluscos foi positivamente relacionada com o tamanho da área úmida e negativamente relacionada com a altitude. A riqueza e a composição de moluscos foram similares entre áreas úmidas permanentes e intermitentes e não diferiram significativamente entre áreas úmidas herbáceas e emergentes. Os três primeiros eixos da CCA explicaram 16,2% da variação na composição de moluscos. A variação na composição foi correlacionada com a área, altitude e condutividade da água. Nossos resultados mostraram que as áreas úmidas são ecossistemas importantes para os moluscos límnicos no sul do Brasil e que a riqueza e a composição de moluscos estiveram relacionadas à área, altitude, condutividade da água e tipo de vegetação aquática dominante.Palavras-cha...

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Estivação de Biomphalaria tenagophila (Pulmonata, Planorbidae)

Abstract: (Pulmonata, Planorbidae

Cited by 9 publications

References 3 publications

Role of antioxidant defenses during estivation and anoxia exposure in the freshwater snailBiomphalaria tenagophila(Orbigny, 1835)

Role of antioxidant defenses during estivation and anoxia exposure in the freshwater snailBiomphalaria tenagophila(Orbigny, 1835)

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

Responses of freshwater molluscs to environmental factors in Southern Brazil wetlands

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