Notas. "Ostrácodos (Crustacea) de la Isla Martín García, Río De La Plata, Argentina"

César, Inés Irma; Armendáriz, Laura Cecilia; Damborenea, María Cristina

doi:10.14409/natura.v2i32.3780

Cited by 9 publications

(11 citation statements)

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“…The input of water into these bodies comes from increases in the water level and flooding from the Río de la Plata in some instances, from precipitation in others, or from both sources . In general, these types of ponds exhibit different degrees of filling and eutrophy, and within them carpets of floating vegetation develop (Lahitte & Hurrell, 1996) that contain diverse invertebrate fauna (Rumi et al, 1996;Damborenea et al, 1997;César et al, 2001).…”

Section: Study Areamentioning

confidence: 99%

Dynamics of pleustonic ostracod populations in small ponds on the Island of Martín García (Río de la Plata, Argentina)

2011

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The biogeography and ecological preferences of Neotropical freshwater ostracods are poorly known, and more so the dynamics of populations and habitat selection of species living in pleustonic environments of temporary ponds. In the present survey we analyze the population changes of ostracods living in pleustonic environments of small freshwater bodies on Martín García Island (Río de la Plata, Argentina). Between June 2005 and June 2007, monthly samples of floating vegetation from eight different ponds on the island were collected, and limnological parameters were measured in situ. The results of multivariate logistic regression showed that the presence of ostracods was significantly related to high dissolved oxygen content and high water temperature. In addition, multivariate regression analysis indicated that, when ostracods were present, their total abundance was negatively related to floating vegetation dry weight. Four ostracod species were found: Strandesia bicuspis, Chlamydotheca incisa, Cypridopsis vidua, and Bradleytriebella trispinosa. The seasonal variation in abundances indicated that populations of the most common species, S. bicuspis and C. incisa, were denser during the summer and autumn months. The results of canonical correspondence analysis showed that individuals of S. bicuspis were more abundant at higher temperatures and lower conductivity than C. incisa. Further research is needed to clarify the observed negative correlation between floating vegetation dry weight and ostracod density and the possible differential thermal preference of the two species studied.

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Section: Study Areamentioning

confidence: 99%

Dynamics of pleustonic ostracod populations in small ponds on the Island of Martín García (Río de la Plata, Argentina)

2011

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“…Available information on aquatic invertebrate fauna mostly refers to mollusks, annelids oligochaetes, hirudinea, platyhelminthes temnocephalids, some crustaceans and insects (Viana, 1937;Austin et al, 1981;Ringuelet, 1985;Rumi et al, 1996Rumi et al, , 2004Damborenea et al, 1997;Fernández and López Ruff, 1999;Armendáriz et al, 2000;Armendáriz and César, 2001;César et al, 2001;Martín and Negrete, 2006;Martín, 2008).…”

Section: Introductionmentioning

confidence: 99%

Biodiversity and ecology of Hirudinea (Annelida) from the Natural Reserve of Isla Martín García, Río de la Plata, Argentina

César

Martín

Gullo³

et al. 2009

Braz. J. Biol.

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The Island of Martin Garcia lies at the confluence of the Uruguay and Paraná Rivers (upper Río de la Plata). This island is an outcrop of the crystalline basement. Due to basalt exploitation the island exhibits several ponds covered by carpets of free-floating macrophytes. Seven major environmental variables were measured: water and air temperature, percentage of oxygen saturation, dissolved oxygen, electrical conductivity, total dissolved solids and pH. Eleven leech species were found, Helobdella striata, H. diploides, H. adiastola and H. hyalina were new records. UPGMA clustering of species based on their occurrence in different ecological conditions revealed three main species groups. Canonical Correspondence Analysis (CCA) explained 97.2% of the correlation between species and environmental variables. H. triserialis shows the widest range of tolerance, H. hyalina shows positive relationships to conductivity; H. diploides shows a high correlation with dissolved oxygen, H. striata, H. lineata, and S. similis are negatively correlated with water temperature, and H. simplex is positively correlated with pH. Relationships between the species richness (S) and the sampling sites were negatively correlated with water temperature and positively correlated with dissolved oxygen. Leech biodiversity from the water bodies of Martín García Island, shows a great diversity of species and a wide plasticity regarding the characteristics of the environmental factors considered.Keywords: biodiversity, CCA, cosmopolitan, ecology, endemics, leeches. A Biodiversidade e a Ecologia de

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“…(Martens & Behen, 1994). También fue hallada en sedimentos cuaternarios (Bertels & Martínez, 1990;Martínez, 2002) y actuales (Ramírez, 1967;César et al, 2004) Distribución geográfica. Es una especie de distribución cosmopolita; en América del Sur se la registró en Argentina, Brasil, Uruguay y Venezuela (Kotzian, 1974;Purper & Würdig-Maciel, 1974;Martens & Behen, 1994).…”

Section: -Ostrácodos De Lagos Someros Argentinaunclassified

“…Es frecuente en sedimentos no marinos del Cuaternario de la provincia de Buenos Aires (Ferrero, 1996) y en ambientes actuales del norte de la Patagonia (Schwalb et al, 2002) y provincia de Buenos Aires (Laprida, 2006 Distribución geográfica. Especie de distribución cosmopolita; en Sudamérica se la encuentra en ambientes actuales de Argentina, Brasil, Paraguay, Uruguay y Venezuela (Martens & Behen, 1994;César et al, 2004); en Argentina fue recuperada de localidades cuaternarias desde el Chaco hasta la Patagonia (Zabert, 1981;Zabert & Herbst, 1986;Cusminsky, 1995;Laprida, 2006), en sedimentos holocenos del curso medio y desembocadura del Arroyo Napostá Grande, Bahía Blanca, Buenos Aires (Martínez, 2002) y en sedimentos actuales del estuario de Bahía Blanca (Martínez, 2005).…”

Section: -Ostrácodos De Lagos Someros Argentinaunclassified

Ostrácodos de lagos someros de la región central de Argentina: implicaciones paleolimnológicas

Kihn¹,

Crespo²,

Pall³

2017

Rev. bras. paleontol.

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-OSTRACODS OF SHALLOW LAKES OF THE CENTRAL REGION OF ARGENTINA: PALEOLIMNOLOGICALIMPLICATIONS. Studies about ostracods in shallow lakes are very scarce in the Province of La Pampa, thus the objective of this work is to contribute to the knowledge of the species present in lentic environments, studying the distribution, abundance, and specific associations of ostracods. The samples come from four shallow lakes of the Pampean Region, Province of La Pampa, Argentina. Sampling was performed along transects perpendicular to the shore. Five genera represented by six species of benthic ostracods were identified. Heterocypris similis was present in all sampled water bodies, but was dominant in the Monte de Caldén (LCM) and Don Tomás (LDT) lagoons. Cypridopsis vidua was very abundant in the LCM. The species Chlamydotheca incisa and Potamocypris unicaudata were only recorded in the Ojo de Agua Lagoon (LCS). C. incisa is recorded for the first time in the province, and P. unicaudata in Argentina. The qualitative and quantitative variations of the ostracod assemblages can be related to topography, sedimentology, vegetation and salinity variations. The results of this study are important in the interpretation of the environments recorded during the Quaternary, since these species are also registered as fossils.Key words: ostracods, lakes, La Pampa, modern analogues, Argentina.RESUMO -Estudos sobre ostracodes em lagoas pouco profundas são muito escassos na Província de La Pampa, Argentina, e, portanto, o objetivo deste trabalho é contribuir para o conhecimento das espécies presentes nos ambientes lenticais, estudar distribuição, abundância e associações específicas de ostracodes. As amostras provêm de quatro lagoas da Região Pampeana, Província de La Pampa, Argentina. Amostragem sazonal foi realizada ao longo de um corte transversal perpendicular à costa, tendo sido identificado um total de cinco gêneros representados por seis espécies de ostracodes bentônicos. Heterocypris similis está presente em todos os corpos de água amostrados, mas é dominante nas lagunas Monte de Caldén (LCM) e Don Tomás (LDT). Cypridopsis vidua é muito abundante na LCM. As espécies Chlamydotheca incisa e Potamocypris unicaudata somente foram registradas na Laguna Ojo de Agua (LCS). C. incisa é o primeiro registro para a província e P. unicaudata é a primeira nomeação para a Argentina. As variações qualitativas e quantitativas dos conjuntos ostracodes podem estar relacionadas à topografia, sedimentologia, vegetação e variações de salinidade. Os resultados deste estudo são importantes na interpretação dos ambientes registrados durante o Quaternário, uma vez que estas espécies também ocorrem como fósseis.Palavras-chave: ostracodes, lagoas, La Pampa, análogos modernos, Argentina. INTRODUCCIÓNLos ostrácodos son microcrustáceos bivalvos con caparazón quitino-calcáreo, que habitan todo tipo de medios acuáticos (desde continentales hasta marinos profundos, pasando por los estuarinos); en ambientes continentales su distribución está condicionada por l...

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Notas. "Ostrácodos (Crustacea) de la Isla Martín García, Río De La Plata, Argentina"

Cited by 9 publications

References 0 publications

Dynamics of pleustonic ostracod populations in small ponds on the Island of Martín García (Río de la Plata, Argentina)

Dynamics of pleustonic ostracod populations in small ponds on the Island of Martín García (Río de la Plata, Argentina)

Biodiversity and ecology of Hirudinea (Annelida) from the Natural Reserve of Isla Martín García, Río de la Plata, Argentina

Ostrácodos de lagos someros de la región central de Argentina: implicaciones paleolimnológicas

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