Alejandro Tablado | Museo Argentino de Ciencias Naturales (original) (raw)

Papers by Alejandro Tablado

Sea stars collection from various Argentinian expeditions, ranging from 1920 and 1979. Data sent ... more Sea stars collection from various Argentinian expeditions, ranging from 1920 and 1979. Data sent by Prof Alejandro Tablado.

Complete metadata about the National Collection of Parasitology (MACN-Pa) is presented. This coll... more Complete metadata about the National Collection of Parasitology (MACN-Pa) is presented. This collection is based on the material collected and studied by Lothar Szidat from 1947 to 1973, and at present it preserv 4822 specimens in 2224 lots of Turbelaria, Aspidogastrea, Digenea, Monogenea, Cestoidea, Acanthocephala Nematoda and other invertebrates.Fil: Tablado, Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; ArgentinaFil: Tricarico, Fabian Gabriel. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentin

FIGURE 4. a) Abactinal plates top view. b) Abactinal plates lateral view. c) Superomarginal plate... more FIGURE 4. a) Abactinal plates top view. b) Abactinal plates lateral view. c) Superomarginal plates, second line from the bottom, just over the inferomarginal plates. d) Adambulacral plates. e) Inferomarginal plates. f) Detail of hairlike spinules on inferomarginal plates. g) Actinal plates. h) Oral plates. Scale bars = 1mm.

FIGURE 1. Relationship between arm length (R) and disk radious (r). Empty square: Leptychaster ke... more FIGURE 1. Relationship between arm length (R) and disk radious (r). Empty square: Leptychaster kerguelenensis type. Empty circle: L. mendosus type. Dotted line: regression line fitted to SW Atlantic specimens. Straight line: regression line fitted to Kerguelen and Marion islands specimens.

Database of the collection of Invertebrates contains records mainly of the orders Caenogastropoda... more Database of the collection of Invertebrates contains records mainly of the orders Caenogastropoda, Cheilostomata, Decapoda, Isopoda, and Veneroida. Other invertebrate orders are represented by fewer records.

This dataset contains the digitized treatments in Plazi based on the original journal article Rom... more This dataset contains the digitized treatments in Plazi based on the original journal article Romanelli, Mariela V., Tablado, Alejandro (2011): Leptychaster kerguelenensis (Echinodermata: Asteroidea) from Southwest Atlantic: Redescription and geographic distribution. Zootaxa 2971: 59-68, DOI: 10.5281/zenodo.201534

The ratio between an ann 1ength (R) and disc diarneter (r) has often been used in systematic desc... more The ratio between an ann 1ength (R) and disc diarneter (r) has often been used in systematic descriptions of seastars. The va1ues of R and r indicate the size of a seastar, whereas the R/r ratio gives an idea about its shape. In addition, most seastars show allometric growth of the anns with respect to the disco Therefore, the R/r ratio of a species varies with the size of individJ.lals. Then, which may be the representative R/r va1ue for a given group of individua1s? Taking the R/r ratio of each individual as a new adimensional variable is inadequate, since the 1atter follows a distribution depending on those R and r in a comp1icated way. Hence, its direct use is not recornmended. The ratio of averages of both variables is a correct measurement, a1though this value tells us nothing about shape change with size. The allometric growth equation: R=arb is the best way to exp1ain the ratio between R and r. However, two pararneters (a and b) are necessary to characterize the shape of a given species. In order to defme shape with only one value, taking also into account al10metric growth, we can fmd the expected R/r ratio (E) in a given r interval: Jr(max)

Echinoderm Research and Diversity in Latin America, 2012

Echinoderm research in Argentina began with Professor Irene Bernasconi (1896–1989; Fig. 11.1), at... more Echinoderm research in Argentina began with Professor Irene Bernasconi (1896–1989; Fig. 11.1), at the Argentine Museum of Natural Sciences ''Bernardino Rivadavia''(MACN), who dedicated 55 years of her life to study the echinoderms inhabiting the Argentine Sea. Her first studies were focused on Echinoidea of Tierra del Fuego (54 S, 68 W) and Ophiuroidea and Crinoidea of South Georgia islands. In 1924, she published the first work with pictures and drawings of the most common sea urchins (Bernasconi 1924). In 1935, she published ...

Hydrobiologia, 2001

Temporal and spatial patterns of polychaete and oligochaete populations inhabiting intertidal sed... more Temporal and spatial patterns of polychaete and oligochaete populations inhabiting intertidal sediments of the Quequén Grande estuary (Buenos Aires Province, Argentina) were analysed monthly during a yearly period. Local sediments are poorly selected, very fine sands, with a high percentage of mud. Two sites, located at both banks of the estuary were studied: (1) Site N, with a comparatively steep slope and percentage of mud increasing with sediment depth; (2) Site Q, with a gentle slope and percentage of mud increasing towards the sediment surface. The assemblage of annelids was characterised by a very low specific richness, being composed just by 4 species: the polychaetes Laeonereis acuta, Boccardiella ligerica and Capitella sp., and the tubificid oligochaete Ilyodrilus cf. frantzi. Density of the nereid L. acuta reached a peak in late summer and a minimum in spring. The population of Capitella sp. also showed maximum densities in summer, but collapsed during early fall, disappea...

Crustaceana, 2003

... L. fortunei populations should be carried out. REFERENCES Boles, LC & RN LlPCius, 199... more ... L. fortunei populations should be carried out. REFERENCES Boles, LC & RN LlPCius, 1994. Potencial for predator-mediated biological control of the ... Tankay, 1: 164-166. Molloy, DP, J. Powel & P. Ambrose, 1994. Short-term reduction of the adult zebra mussels ...

Leptychaster kerguelenensis Smith 1876 Figures 3 and 4 Leptychaster k... more Leptychaster kerguelenensis Smith 1876 Figures 3 and 4 Leptychaster kerguelenensis Smith 1876, p. 110 Leptoptychaster kerguelenensis: Smith 1879, p. 278, pl. 17, fig. 2 Leptoptychaster kerguelensis: Koehler 1917, p. 52, pl. 6, figs. 1, 2, 7, 12 Leptoptychaster mendosus Koehler 1923, p. 98, pl. 12, figs. 3–5 Leptychaster kerguelenensis mendosus: Fisher 1940, p. 84. Compressed disc; rays five (R:r from 2.0–5.0); width of arms do not decreases along them but it do rapidly at distal end, ending as blunt point; madreporite obscured by abactinal paxillae (Fig. 3). Abactinal plates paxilliform, arranged irregularly, projecting proximal edges of plates lobed, reduced in size to the center of the disk and toward the midline of arms (near superomarginal plates from 2.3–2.7 mm size, carry 15– 33 spines from 0.1–0.2 mm long; center of disk and arms from 1.8 –2.0 mm size, carry 15–24 spines from 0.1–0.2 mm long) (Fig. 4 a and b). Superomarginal plates paxilliform, similar but larger than abactinals (from 2.9–3.2 mm size, carry 20–32 spines 0.1–0.2 mm long), and separates from inferomarginal ones by a well-defined groove (Fig. 4 c). Inferomarginal plates tall, short, forming vertical edge of body; with prominent metapaxillar ridge raised transversally to the ambulacral groove (from 1.2–1.7 mm tall and from 0.3–0.5 mm wide) in middle of the ray, carry on top of the ridge 43–61 spines, 0.2–0.3 mm long, arranged irregularly (Fig. 4 e). Slope of ridge carry small, thin and delicate hairlike spinules, parallel to base plate, and interlaced spinules forms fasciolar grooves between contiguous inferomarginal plates (Fig. 4 f). Small triangular actinal area with small paxilliform plates, arranged in a few rows from the mouth to distal end of arm (from 0.7–0.8 mm size, carry 12–22 spines 0.3–0.4 mm long). Only one row of actinal plates is present between furrow and margin in the most part of the arm (Fig. 4 g). Adambulacral plates are widely spaced, consecutive plates being united by broad ligam [...]

Studies on Neotropical Fauna and Environment, 1985

... c Swets & Zeitlinger Dinámica Temporal de Pequeños Peces de Agua libre en la Laguna &quot... more ... c Swets & Zeitlinger Dinámica Temporal de Pequeños Peces de Agua libre en la Laguna "La Cuarentena" (Isla Carabajal, río Paraná medio) Norberto O. OLDANI* y Alejandro TABLADO** ... Ecología6: 27-35. GREENWOOD, P.; DE ROSEN; SH WEITZMAN & GS MYERS, 1966. ...

Hydrobiologia, 1990

Chilina gibbosa is an endemic snail widely distributed in Patagonia, Argentina. Due to its import... more Chilina gibbosa is an endemic snail widely distributed in Patagonia, Argentina. Due to its importance in the benthic fauna and in the diet of some fish in the oligo-mesotrophic reservoir Ezequiel Ramos Mexía (39°30' S, 69°00' W), special attention has been given to its life cycle, growth patterns and annual production. Samples were taken monthly at five littoral stations between June 1983 and July 1984. Mean abundance and biomass of C. gibbosa were much higher in vegetated stations dominated by Potamogeton berteroanus (Station 1: 583 ind. m - 2, 5.95 g AFDM m - 2) or by Nitella clavata (Station 5: 275 ind. m - 2, 4.18 g AFDM m - 2) than bare stations with low transparency or stations with other macrophytes. The snails presented a clustered spatial pattern and their abundance was significantly correlated with macrophyte wet biomass only when this was above 250 g m - 2. Analysis of size distributions showed an annual life cycle with a reproductive period in the summer. However, difTerences in recruitment and growth occurred probably due to difTerences in water temperature and food availability. Growth was maximum in summer and almost absent during winter. Hence, shell growth data fit a sigmoid curve well, and growth was somewhat higher at Station 1. Annual production at Stations 1 and 5,
estimated by the 'growth increment summation' method (28.8 g AFDM m -2 and 14.18 g AFDM m-2 respectively), was among the highest recorded for pulmonate gastropods, possibly due to a low interspecific competition. The P: B ratio values were within the range for univoltine gastropods (4.84 and 3.39).
The high productivity and turnover rate ofthese snails grant a high availability offood for the abundant molluscivore, the silverside Patagonina hatcheri.

Thalassas: an International Journal of Marine Sciences, 2008

Population dynamics of the intertidal mytilid Brachidontes rodriguezii (Bivalvia) on a rocky shor... more Population dynamics of the intertidal mytilid Brachidontes rodriguezii (Bivalvia) on a rocky shore. The mytilid Brachidontes rodriguezii is the key species that structures the intertidal benthic community of rocky shores from Buenos Aires Province. The aim of this work was to study the temporal-spatial dynamics of the population of B. rodriguezii from two localities (Quequén and Necochea) by analysing the variations of production and recruits density in vertical and horizontal slopes of the substrate throughout the year. The statistical analyses indicated that both the temporal and spatial variations of B. rodriguezii production were significant. In Necochea the production was higher in summer than in the other seasons, whereas in Quequén maximum production values were in winter. The population always showed a high percentage of recruits throughout a year, with a maximum of 58% recruits in Necochea during the summer. The differences found showed significantly spatial and temporal he...

A BSTRACT Curatorial works in the National Collection of Invertebrates of Argentina: contribution... more A BSTRACT Curatorial works in the National Collection of Invertebrates of Argentina: contribution to the Biodiversity and Biogeography of Argentinean land snails. New biogeographic data were obtained during the revision of the Invertebrates National Collection of the Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”, Buenos Aires, Argentina. Adelopoma paraguayana is found in Argentina (Misiones Province) for the first time. Cecilioides consobrina and Miradiscops brasiliensis are now reported from Formosa Province, and Artemon apertus for Buenos Aires Province. Gastrocopta sp. and Habroconus sp. are recorded for Formosa and San Juan provinces, respectively. In addition, the exotics Hawaiia minuscula and Bradybaena similaris are reported for Argentina (Buenos Aires and Misiones provinces, respectively).

Fueron investigados los nanofosiles calcareos de ocho testigos (box-cores) obtenidos en el oceano... more Fueron investigados los nanofosiles calcareos de ocho testigos (box-cores) obtenidos en el oceano Pacifico ecuatorial central y occidental. Los testigos estudiados presentaron una riqueza especifica muy baja (11 especies y 2 generos, no considerando las especies que se consideraron resedimentadas) comparados con la comunidad nanoplanctonica actual de las aguas superficiales del Pacifico ecuatorial. Escasas diferencias en la tanatocenosis de cocolitoforidos fueron encontradas desde el ultimo periodo glacial, aplicando metodos multivariados luego de agrupar los niveles de las edades similares en cada una de las areas estudiadas. En los ultimos 40.000 anos la tanatocenosis de cocolitos en el Pacifico ecuatorial esta dominada por especies del "complejo Gephyrocapsa" (G. Oceanica, G. Caribbeanica y formas intermedias) seguido por Calcidiscus leptoporus. La mayor abundancia relativa del "complejo Gephyrocapsa" y de Calcidiscus leptoporus ha sido interpretado como un pe...

Evaluation des changements se produisant dans la communaute des poissons de la lagune La Cuarente... more Evaluation des changements se produisant dans la communaute des poissons de la lagune La Cuarentena dans un cycle annuel et determination de l'influence de quelques facteurs biotiques et abiotiques

Zootaxa, Jul 20, 2011

The only two specimens of Leptychaster spp. reported from Southwest Atlantic, were determined as ... more The only two specimens of Leptychaster spp. reported from Southwest Atlantic, were determined as L. kerguelenensis mendosus by Fisher (1940). Twelve specimens of Leptychaster kerguelenensis from Argentine continental shelf collected by the R/V Shinkai Maru, and two specimens from Kerguelen Islands collected by B.A.N.Z.A.R.E., were used to redescribe the species. All the material is deposited at the Museo Argentino de Ciencias Naturales "Bernardino Rivadavia". All Atlantic specimens agree with the description of Leptychaster kerguelenensis and no morphological differences were found with specimens from Kerguelen Islands. From the present study, no subspecies are recognized within L. kerguelenensis and L. mendosus is a junior synonym of the former.

A. Pérez-Ruzafa, JJ Alvarado, FA Solís-Marín, JC Hernández, A. Morata, C. Marcos, M. Abreu-Pérez,... more A. Pérez-Ruzafa, JJ Alvarado, FA Solís-Marín, JC Hernández, A. Morata, C. Marcos, M. Abreu-Pérez, O. Aguilera, J. Alió, JJ Bacallado-Aránega, E. Barraza, M. Benavides-Serrato, F. Benítez- Villalobos, L. Betancourt-Fernández, M. Borges, M. Brandt, MI Brogger, GH Borrero-Pérez, BE Buitrón-Sánchez, LS Campos, JR Cantera, S. Clemente, M. Cohen-Renfijo, SE Coppard, LV Costa-Lotufo, R. del Valle-García, ME Díaz de Vivar, JP Díaz- Martínez, Y. Díaz, A. Durán-González, L. Epherra, M. Escolar, V. Francisco, CA ...

Echinoderm Research and Diversity in Latin America, 2012

Hydrobiologia, 2001

Crustaceana, 2003

Studies on Neotropical Fauna and Environment, 1985

Hydrobiologia, 1990

Thalassas: an International Journal of Marine Sciences, 2008

Zootaxa, Jul 20, 2011