The significance of molluscs as paleoecological indicators of freshwater systems in central-western Argentina

Francesco, Claudio G. De; Hassan, Gabriela S.

doi:10.1016/j.palaeo.2009.01.003

Cited by 27 publications

(44 citation statements)

References 5 publications

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“…24-12 ka) (Tripaldi et al, 2011) leading to the development of less productive and stressful environments. The poor preservation exhibited by shells (De Francesco & Hassan, 2009) is in agreement with this interpretation. Moreover, it is highly probable that these shells represent reworked concentrations (from older successions) that were redeposited in PV through episodic fl ood events, as suggested by the inverted ages obtained in this succession (Table 2).…”

supporting

confidence: 85%

“…Living mollusks were collected from 17 sites distributed along a latitudinal/altitudinal (N to S) gradient ( Figure 1 (De Francesco & Hassan, 2009).…”

Section: Living Mollusksmentioning

confidence: 99%

“…Prieto et al, 2004;De Francesco et al, 2007;De Francesco & Hassan, 2009). Many of these deposits occur at different hydrological settings along gradients of aridity and altitude, and possess abundant mollusk shells whose stable isotope compositions remain nearly unknown.…”

Section: Introductionmentioning

confidence: 99%

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Stable isotope composition of freshwater mollusk shells from Central-Western Argentina

Francesco¹,

Hassan²

2013

Rev. bras. paleontol.

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ABSTR ACT -The variability in δ 18O and δ 13 C composition of modern and fossil mollusk shells in central-western Argentina was assessed in order to contribute to a better understanding of their value as paleoclimatic indicators. Living mollusks were collected from 17 sites distributed along a latitudinal/altitudinal gradient in Mendoza Province. Quaternary mollusks were obtained from fi ve alluvial successions outcropping in river margins from the same area. C, foi registrado durante o Holoceno, sugerindo a existência de paleoambientes menos produtivos, provavelmente devido à incidência de condições mais secas do que no presente.Palavras-chave: isótopos de oxigênio e carbono, semi-árido, reconstrução paleoambiental, América do Sul, Quaternário Superior, piemonte andino.

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supporting

confidence: 85%

“…Living mollusks were collected from 17 sites distributed along a latitudinal/altitudinal (N to S) gradient ( Figure 1 (De Francesco & Hassan, 2009).…”

Section: Living Mollusksmentioning

confidence: 99%

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Stable isotope composition of freshwater mollusk shells from Central-Western Argentina

Francesco¹,

Hassan²

2013

Rev. bras. paleontol.

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“…Interestingly, there is no fossil record of H. hatcheri from the Centre-West of Argentina although the Holocene aquatic malacofauna of the region is, with the exception of this species and the exotic Physa acuta Draparnaud, 1805, identical to the current gastropod and bivalve assemblages (de Francesco & hassan, 2009). These observations suggest that this enigmatic taxon may have colonized the Centre-West of Argentina in the last ca.…”

Section: Discussionmentioning

confidence: 96%

A molecular contribution to the controversial taxonomical status of some freshwater snails (Caenogastropoda: Rissooidea, Cochliopidae) from the Central Andes desert to Patagonia

Koch

Martín

Ciocco

2015

Iheringia, Sér. Zool.

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ABSTRACT. For over 40 years malacologists have been discussing the taxonomical status of Heleobia species, an enigmatic genus from Cochliopidae family (Caenogastropoda: Rissooidea). As with other rissooidean families, the considerable character convergence and the paucity of anatomical synapomorphies has proved to be a problem in resolving cochliopid phylogenetic relations and establishing the validity of several nominal cochliopid species. Here we present a molecular contribution to solve the taxonomical status of one of the most abundant Southern South America cochliopid genera which has many endemic species. We report molecular evidence that supports three of the four Heleobia groups described for this region, the "australis", "parchappii" and "piscium" groups. The fourth, the "hatcheri" group, belongs not to Heleobia but to a different genus which itself should not be considered as part of the family Cochliopidae but closely related to genus Potamolithus Pilsbry & Rush, 1896.

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“…These mollusks have a high capacity to tolerate oxygen scarcity, and they are also more tolerant to extreme variations of temperature than are most prosobranchs (McMahon 1983, Brown et al 1998). The pulmonates P. acuta and B. straminea have been recorded in lentic environments with low oxygen concentration in many parts of Brazil (Martins-Silva & Barros 2001, Vidigal et al 2005, Tibiriçá 2006) and in nearby countries (Rumi & Hamann 1990, De Francesco & Hassan 2009). Among the Brazilian species of Biomphalaria, B. straminea is the best adapted to dry climates (Paraense 1977).…”

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 significance of molluscs as paleoecological indicators of freshwater systems in central-western Argentina

Cited by 27 publications

References 5 publications

Stable isotope composition of freshwater mollusk shells from Central-Western Argentina

Stable isotope composition of freshwater mollusk shells from Central-Western Argentina

A molecular contribution to the controversial taxonomical status of some freshwater snails (Caenogastropoda: Rissooidea, Cochliopidae) from the Central Andes desert to Patagonia

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

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