Ezequiel Mabragaña

Ezequiel Mabragaña
Universidad Nacional de Mar del Plata | UNMDP · Instituto de Investigaciones Marinas y Costeras (IIMyC)

PhD

About

76
Publications
31,672
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Introduction
Ezequiel Mabragaña currently works at the Instituto de Investigaciones Marinas y Costeras (IIMyC), Facultad de Ciencias Exactas y Naturales, CONICET, Universidad Nacional de Mar del Plata. Ezequiel does research in Systematics (Taxonomy), Marine Biology and Genetics of fishes. Their current project is 'Taxonomy and bioecology of fishes with emphasis on skates (Rajiformes)'.
Additional affiliations
April 2009 - present
Universidad Nacional de Mar del Plata
Position
  • Researcher

Publications

Publications (76)
Article
Environmental pollution affects the quality of the natural environment where major and trace elements have been commonly found to accumulate in biotic and abiotic matrices. The purposes of this research were (1) to assess the accumulation and distribution of 24 major and trace elements in water, sediments, and muscle and gills of ten native fishes...
Article
Full-text available
We conducted a revision of the Neotropical genus Acrobrycon . A previous study synonymized the species, A. ipanquianus , distributed from the western portion of the Amazon River to the north-western region of the La Plata River Basin, and A. tarijae , with type locality in the Lipeo River in Bolivia. We revisited this result by collecting new morph...
Article
Full-text available
Optimising conservation efforts requires an accurate record of the extant species as well as their geographic distributions. Nevertheless, most current conservation strategies start from an incomplete biodiversity inventory. Argentina has an extraordinary diversity of species, however, until now an updated inventory of its fauna has not been carrie...
Book
Full-text available
Un inventario biológico enumera, ordena, cataloga y/o cuantifica ecorregiones, ecosistemas o especies. Es una herramienta básica y fundamental de gestión ambiental, que, al mismo tiempo, constituye la primera medida de conservación, dado que no se puede cuidar aquello que es ignorado. El presente Inventario Biológico Argentino es el esfuerzo de un...
Preprint
Full-text available
We conducted a review of the Neotropical genus Acrobrycon . A previous study synonymized the two recognized species in the genus: A. ipanquianus , distributed from the western portion of the Amazon River to the northwest region of the La Plata River Basin, and A. tarijae , described from the Lipeo River in Bolivia. We revisited this result by colle...
Article
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The Atlantic Rainforest is among the main biodiversity hotspots in the world, the Yabotí Biosphere Reserve (YBR) being one of the most important remaining areas. Agriculture practices could lead to intensive usage of pesticides resulting in a risk to the environment and human health. Water, suspended particulate matter (SPM), sediment, and fish (An...
Article
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The first non-coastal Sub-Antarctic Marine Protected Area (Namuncurá) in Argentina was created in 2013, at Burdwood Bank (MPAN-BB), an undersea plateau located about 200 km south from Malvinas/Falkland Islands, SW Atlantic Ocean. The main contribution of this work was to explore fish species composition and the structure of fish assemblages in thre...
Article
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Skeletal structures, especially the claspers, neurocrania, and scapulocoracoids have been widely used to characterize and describe new species of elasmobranchs. Intra and interspecific variation of scapulocoracoids in 3 species of Psammobatis (n = 94) from the Southwest Atlantic Ocean were analyzed to assess its utility as a diagnostic character in...
Article
Embryonic development is a vulnerable and key period during the life cycle of an oviparous elasmobranch. Captivity studies are difficult to carry out on non-coastal species; hence, embryonic development can be analysed from samples collected from the seabed. Here, embryonic development of three shelf and deep-water skates from the southwest Atlanti...
Article
We assessed the validity of the division of the Magellanic Province into the four provinces as proposed by Briggs & Bowen (J Biogeogr 39 12–30, 2012): Southern Chile, Tierra del Fuego, Southern Argentina and Falkland (Malvinas) Islands. We aimed to (a) present an updated list of the fishes from the region known as ‘Magellanic Province’, (b) analyse...
Article
Full-text available
Species of new world silversides (Actinopterygii; Atherinopsidae; genus Odontesthes) possess economic relevance, biological interest and ecological importance. In the present paper we: (A) investigate the molecular diversity in marine species of Odontesthes from the South West Atlantic Ocean (SWAO), and analyse their interspecific relationships and...
Article
Zearaja chilensis has been reported from Southern Brazil in the Southwest Atlantic (SWA) to northern Chile in the Southeast Pacific (SEP), and it was listed as vulnerable by the IUCN. Recent molecular studies have called into question the conspecificity between specimens from these opposite coasts of South America, which can have implications for t...
Article
Full-text available
In several genera, the otolith shape is species specific and the use of this structure provides a useful tool aiding in the species identification. In many studies regarding Neotropical fish fauna, species of the genus Astyanax are commonly identified at the genus level, mainly due to the phenotypic plasticity of the morphological characters tradit...
Article
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With an estimate of around 9,000 species, the Neotropical region hosts the greatest diversity of freshwater fishes of the world. Genetic surveys have the potential to unravel isolated and unique lineages and may result in the identification of undescribed species, accelerating the cataloguing of extant biodiversity. In this paper, molecular diversi...
Data
All used sequences. Annotated list of all used sequences of Hoplias. BIN: Barcode Index Number. % similarity: percentage of similarity between public sequences and the nearest BOLD sequence with a known BIN. BIN Tax ID: current taxonomy. (XLSX)
Data
Genetic divergence. Estimates of genetic divergence between BINs based on the Tamura-Nei model with a gamma distribution (shape parameter = 1). The final data set involved 344 nucleotide sequences with 652 base positions. (XLS)
Article
Full-text available
By means of an integrative taxonomic approach, a new species of the H. malabaricus group from the Río de La Plata basin is described. Hoplias argentinensis, new species, is characterized by: 17-19 predorsal scales, 42-43 vertebrae, 20 scales around caudal peduncle, no distinctive brown bands in lower jaw, last series of vertical scales on caudal fi...
Article
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Egg cases of the narrowmouthed catshark Schroederichthys bivius were recorded entangled with sponges, corals and tubeworms at different sites in the south-west Atlantic Ocean. This work sheds light on the importance of benthic invertebrates in the life cycle of oviparous chondrichthyan species.
Article
Poeciliids comprise around 300 species inhabiting the fresh and brackish waters of the Americas and Africa. Poecilia reticulata is native to Northeastern South America and Trinidad and Tobago. In this paper, introduced specimens of P. reticulata collected in the lower Paraguay River in Argentina, were characterized by means of molecular and taxonom...
Article
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Four valid species are currently recognized in the Neotropical migratory genus Salminus: Salminus brasiliensis, Salminus franciscanus, Salminus hilarii and Salminus affinis. However, molecular evidence strongly suggested that two different species might be contained under the taxonomic denomination Salminus brasiliensis. Therefore, the geographical...
Article
Scapulocoracoid variation in Sympterygia acuta and S. bonapartii was analyzed inter- and intraspecifically, and the utility of this structure as a diagnostic character in skates was evaluated. Skeletal pieces were obtained from a total of 85 specimens collected in coastal waters of northern Argentina in 2011 and 2012. Morphometric variation was ana...
Article
Egg cases of Bathyraja griseocauda were larger (140–142 mm in length) than those of Bathyraja scaphiops (88–90 mm in length) and their surface was relatively smooth, without denticles, prickles or any ornamentation. Egg cases of B. scaphiops had a relative coarse surface, covered with prickles of similar size. An identification key for the all desc...
Article
Freshwater elasmobranchs are threatened but little is known about them. Potamotrygon brachyura is the world's largest obligate freshwater elasmobranch. This makes it popular among fishermen and suggests a susceptibility to anthropogenic threats. We collected records of P. brachyura (n ¼ 70) from media, fishermen and scientific sampling, to estimate...
Article
Hoplias malabaricus is one of the 12 valid species in the genus Hoplias, the most diverse genus among the Erythrinidae. During the last decades, cytogenetic studies had shown that this species represents a well-populated species complex. The new species of the Hoplias malabaricus group is described from the Uruguay, Paraná and Paraguay Rivers, in A...
Chapter
Fish species richness in the Southern Ocean accounts for approximately 2 % of the world’s ocean species, with more than 370 species registered and several awaiting for formal description. Here we explore on the use of DNA barcoding to discriminate fishes from Antarctic Peninsula by compiling our results and placing them into a comparative framework...
Article
The aim of this paper was to explore egg-laying areas of oviparous chondrichthyans occurring in the northern part of the Southwest Atlantic Ocean (36°S–41°S) at between 50 and 200 metres depth and the Mar del Plata Canyon (from 200 to 3447 m). A total of 515 capsules were collected corresponding to 10 species. Four species accounted for 87.6% of th...
Article
Full-text available
In this work the distribution and abundance of egg cases of skates Bathyraja brachyurops and B. macloviana on the Buenos Aires continental shelf and the Mar del Plata submarine canyon are analized and stages of embryonic development described. Although distribution, similar for both species, was registered south of 37° S at 84-215 m depth, some cas...
Article
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A record of a juvenile Porbeagle, Lamna nasus, in the coastal waters of Argentina is confirmed by DNA barcoding, since the specimen lacked some external diagnostic features. We discuss the occurrence of this species in the coastal waters of Argentina, its molecular affinity with conspecifics from a broad range of the species, and relevant conservat...
Article
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The identification of fish stocks in basic requirement for fishing management in large rivers. The objective of this research was to describe for the first time otoliths river crocker (Plagioscion ternetzi) and to evaluate the existence of different fish stocks in the Paraguay river lower basin (26°31'20.78"S, 58°13'45.94"W) and the middle Paraná r...
Article
Geometric-morphometric and spinulation pattern approaches were employed to assess the discrimination of two species of Sympterygia skates in the Southwest Atlantic: Sympterygia acuta Garman 1877 and Sympterygia bonapartii Müller & Henle, 1841. Two types of variables were employed: linear morphometrics measurements (LMMs), and interlandmark distance...
Article
Full-text available
The aim of the present study provides the first results on the reproductive biology of the anchovy, Anchoa marinii, in a nearby-coastal area of Mar Chiquita coastal lagoon, 37º32’00”S 57º19’00”W, Argentina. To perform this, we employed mainly female gonads, at both microscopic and macroscopic levels. The oocyte diameter distribution and the microsc...
Article
Full-text available
We examined the fish larvae colonising pattern of the Mar Chiquita lagoon (Argentina).We hypothesised that in this microtidal lagoon, winds could regulate fish larvae dynamics. Ichthyoplankton samples were taken in marine waters, the surf zone and the estuary. Previous studies showed no reproduction by fishes with planktonic eggs inside the lagoon....
Book
Full-text available
Esta obra sienta las bases para la implementación de actividades de monitoreo en los cuerpos de agua de alto valor ambiental. Este manual surge de la necesidad de generar información sobre la calidad de agua de los cuerpos de agua superficiales de la provincia de Misiones, basándose en las problemáticas regionales y los vacíos de datos, como una al...
Article
Full-text available
Most skates are adapted to shelf and slope environments experiencing less seasonal variation than coastal ecosystems.Here, we analyze the reproductive ecology of Sympterygia acuta. We hypothesize that, like its congener Sympterygia bonapartii, S. acuta has a seasonal reproductive cycle. To test this hypothesis, we examined multiple lines of evidenc...
Article
Full-text available
The fish fauna of a subtropical mountain stream in Argentina was surveyed for the first time. The abundance and occurrence of species were explored considering variation in hydrology, seasonality and the abiotic environment. We collected 221 individuals of 23 species from 10 families and four orders. Small sized species and small individuals domina...
Article
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Two species of Myliobatis, the southern eagle ray M. goodei Garman and the bullnose eagle ray M. freminvillii Le Sueur, have long been recognized to occur in coastal Argentinean waters. Several unusual specimens belonging to the family Myliobatidae were recently collected off Buenos Aires Province, Argentina. These specimens clearly belong to the g...
Article
The fish fauna of the Pampa Plain, the southernmost distribution range of many Neotropical species, was barcoded in this study. COI sequences were analysed by means of distance (K2P/NJ) and character-based (ML) models, as well as the Barcode Index Number (BIN). K2P/NJ analysis was able to discriminate among all previously identified species while a...
Article
Full-text available
Deux spécimens de Sardinella aurita ont été capturés dans la lagune côtière de Mar Chiquita, Argentine, et identifiés sur des bases morphologique et moléculaire. Le statut taxinomique du genre dans l’océan Atlantique ouest reste encore incertain. Les résultats présentés dans cette étude, basés sur l’analyse par ADN barcoding, sont en accord avec ce...
Article
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La présente note décrit un cas aberrant de nageoire supplémentaire chez un spécimen de Zearaja chilensis (Guichenot, 1848), capturé au large de la Patagonie dans les eaux argentines.
Article
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The reproductive biology and abundance of the freckled sandskate Psammobatis lentiginosa in the southwest Atlantic was investigated. Specimens of P. lentiginosa were captured from 35815?S to 45819?S with a gap between 39820? and 44822?S, from 49 to 164 m depth, which was consistent with most previous studies. Major concentrations of P. lentiginosa...
Article
Teeth morphology has been widely used in taxonomic, biological and fossil teeth studies of Chondrichthyes. Herein, dental abnormalities in Amblyraja doellojuradoi are described. Almost 10% of 182 specimens sampled presented any of these types of dental anomalies: (1) an additional incomplete tooth row between two complete rows, (2) an increasing to...
Article
Full-text available
Teeth morphology has been widely used in taxonomic, biological and fossil teeth studies of Chondrichthyes. Herein, dental abnormalities in Amblyraja doellojuradoi are described. Almost 10% of 182 specimens sampled presented any of these types of dental anomalies: (1) an additional incomplete tooth row between two complete rows, (2) an increasing to...
Article
Full-text available
Competition for food could be a major force driving changes in the community structure of skates (Rajidae) subjected to fishing exploitation. Under this hypothesis, small skates are released from competition with larger skates after fishing has depleted the larger species. Here, we compare the abundance patterns of two sympatric skates with similar...
Article
Full-text available
Competition for food could be a major force driving changes in the community structure of skates (Rajidae) subjected to fishing exploitation. Under this hypothesis, small skates are released from competition with larger skates after fishing has depleted the larger species. Here, we compare the abundance patterns of two sympatric skates with similar...
Article
This work constitutes the first description of the clasper of Amblyraja doellojuradoi. The characterization was based on both external morphology and the composition of the internal cartilages. A comparison based on these structures with other species of the genus is provided. Considering all of the cartilages, the basal and terminal series of A. d...
Data
Full-text available
List and number of Argentinean fishes barcoded, arranged by taxonomic category. Clasification follows Nelson [64]. Collection sites: MdP coast, coast of Mar del Plata city; SAO coast, coast of San Antonio Oeste; MCh lagoon, Mar Chiquita coastal lagoon; 1, Off Buenos Aires province; 2, Inner shelf of Patagonian waters; 3, outer shelf of Patagonian w...
Data
Full-text available
Details of species and specimens. BOLD specimen numbers given, along with GenBank accession numbers, geographic locality and voucher details. (PDF)
Data
Full-text available
Neighbour-joining tree of 577 COI sequences from the 125 fish species sampled as obtained in BOLD, using K2P distances. (PDF)
Article
Full-text available
Background: DNA barcoding has been advanced as a promising tool to aid species identification and discovery through the use of short, standardized gene targets. Despite extensive taxonomic studies, for a variety of reasons the identification of fishes can be problematic, even for experts. DNA barcoding is proving to be a useful tool in this contex...
Article
Full-text available
Desde la Fundación Bosques Nativos Argentinos para la Biodiversidad (www.bosques.org.ar) apoyamos las investigaciones de nuestros científicos argentinos. Y con ese espíritu construímos el CIAR, Centro de Investigaciones “Antonia Ramos” en plena selva misionera. La Provincia de Misiones, con el mérito de todos los misioneros, nos brinda la biodivers...
Article
Full-text available
Egg cases of 21 oviparous chondrichthyan species from the south-west Atlantic Ocean are described and compared. The catshark Schroederichthys bivius has a cigar-shaped egg case with curled tendrils only at the posterior end. Egg cases of the elephant fish Callorhinchus callorynchus are spindle-shaped with anterior and posterior tubular extensions a...
Article
Full-text available
In the present paper a specimen of the blue runner Caranx crysos, a termophilic species commonly found in subtropical Atlantic waters, was newly reported from the Mar del Plata coast. The presence of the blue runner in Argentine waters could be explained by the warm drift theory
Article
Full-text available
Morphologically, both classic and landmark-based morphometry and meristic analyses of 241 specimens of Merluccius, along with the re-examination of six paratype specimens of Merluccius hubbsi, the holotype and three paratypes of Merluccius patagonicus and the syntype of Merluccius australis revealed the presence of only two species of Merluccius in...
Article
Full-text available
On the Argentine Continental Shelf 27 species of oviparous chondrichthyans have been reported. Egg cases layed on the bottom of the sea can be a useful tool for identifying individual species, egg-laying areas and seasons. In this work a field guide for a correct sorting out is presented based on the analysis of 138 egg cases belonging to 21 chondr...
Article
Full-text available
: Food habits of Bathyraja brachyurops were studied based on stomach content analyses of 346 specimens collected from research cruises carried out from 2003 to 2005 on the Argentinean continental shelf (36 o S-55 o S). A total of 265 stomachs (76.6%) contained food, and thirty-five taxonomic levels of prey were identified. The most important prey w...
Article
Full-text available
Un jeune spécimen de Selene vomer a été capturé dans la lagune côtière Mar Chiquita (Argentine). Il s’agit du premier signalement de ce Carangidae dans cette lagune. Les données morphométriques et méristiques relatives au spécimen sont incluses dans la diagnose. La présence d’espèces d’origines tropicales est fréquente dans les eaux côtières du nor...
Article
Full-text available
Food habits of Bathyraja brachyurops were studied based on stomach content analyses of 346 specimens collected from research cruises carried out from 2003 to 2005 on the Argentinean continental shelf (36ºS-55ºS). A total of 265 stomachs (76.6%) contained food, and thirty-five taxonomic levels of prey were identified. The most important prey were fi...
Article
Full-text available
A new species of Dipturus is described from ten specimens collected off Patagonia, Argentina. Morphological and molecular approaches were used to compare among specimens of recognized Dipturus species. By comparing morphometric, meristic and mitochondrial cytochrome c oxidase I (COI) sequence data, specimens referred to as longnose skate and origin...
Article
Full-text available
A new species of Dipturus is described from ten specimens collected off Patagonia, Argentina. Morphological and molecular approaches were used to compare among specimens of recognized Dipturus species. By comparing morphometric, meristic and mitochondrial cytochrome c oxidase I (COI) sequence data, specimens referred to as longnose skate and origin...