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Publications (243)
This study provides novel data on fecundity and oviposition rate of Rioraja agassizii and complementary information on incubation period in captivity. Two females of R. agassizii were maintained in captivity over 1‐year period. Oviposition rate was 0.28 and 0.26 egg cases per day, and fecundity was 114 and 92 egg cases for each female. Incubation p...
Abstract. – Flatfish fisheries represent an important resource at the artisanal and industrial levels, with the largest catches in the Southwestern Atlantic belonging to the species of the genus Paralichthys. The lack of tools and consensus in the identification of flatfish species is a problem to achieve correct resource management. Currently, sev...
Livestock grazing is a major economic activity worldwide. Cattle frequently graze and congregate in watercourses and
riparian areas because of the availability of water, shade and the quality and variety of forage, thereby altering the ecological
condition of stream ecosystems. We have explored the effects of cattle intrusion on the environmental c...
Currently, the genus Zenopsis, also known as silver John Dory, comprises at least five valid species with a wide range of distribution. However, recent studies have proposed the existence of a new Zenopsis species inhabiting the Indian Ocean, and a preliminary search in the Barcode of Life Database reveals the presence of different barcode index nu...
The world’s oceans designated under marine protection have increased recently. Most marine protected areas (MPAs) target vulnerable, keystone, charismatic, and/or endemic species. In the sub-Antarctic, ocean protection is associated with oceanic islands, except for the MPAs Namuncurá-Burdwood Bank I and II (MPA N-BB; ~53-55°S, ~56-62°W), which are...
The mud flounder Paralichthys orbignyanus (Pleuronectiformes, Paralichthyidae) inhabits shallow waters of low salinities and mud bottoms in the temperate marine coastal regions of the Bonaerensean Ecoregion of the Argentinean Biogeographic
Province in the south-western Atlantic Ocean. Specimens of P. orbignyanus were collected from Lagoa dos Patos...
The Burdwood Bank (BB) is a subantarctic area, where two of the three Marine Protected Areas (MPA) of the Argentinean Exclusive Economic Zone are located: Namuncurá I, and Namuncurá II. The area is characterized by a high biodiversity of benthic invertebrates and teleost fishes; however, the available information on oviparous chondrichthyans is sca...
Longnose skates have great economic importance in South American fisheries, and in order to preserve them it is important to have a well-defined taxonomic status of their species. Dipturus lamillai was recently described for Malvinas Islands waters based on morphological and molecular comparisons with Zearaja chilensis. Although D. lamillai has bee...
The mud flounder Paralichthys orbignyanus (Pleuronectiformes, Paralichthyidae) inhabits shallow waters of low salinities and mud bottoms in the temperate marine coastal regions of the Bonaerensean Ecoregion of the Argentinean Biogeographic Province in the south‐western Atlantic Ocean. Specimens of P. orbignyanus were collected from Lagoa dos Patos...
The Burdwood Bank (BB) is a subantarctic area, where two of the three Marine Protected Areas (MPA) of the Argentinean Exclusive Economic Zone are located: Namuncurá I, and Namuncurá II. The area is characterized by a high biodiversity of benthic invertebrates and teleost fishes; however, the available information on oviparous chondrichthyans is sca...
Oviparous elasmobranch embryos (Chondrichthyes) have been the focus of several embryological studies; they are useful models for studying early ontogeny in vertebrates, as can help explore the existence of common developmental patterns among species. Skates (Rajiformes) are the most speciose order of oviparous elasmobranchs, however, few studies ar...
Some of the characters used in description and identification keys for skates are mostly valid for adults, and may dramatically change through ontogeny. The lack of morphological description of the neonate stage prevents from identifying them in nature. Two neonates of Psammobatis lentiginosa born in captivity and three collected from the wild were...
Patagonotothen ramsayi has the highest concentrations at Burdwood Bank, playing a key ecological role in the demersal food web. The aim of this study was to describe and analyze the feeding ecology of longtail southern cod in the Marine Protected Area Namuncurá-Burdwood Bank (MPAN-BB). From 369 specimens sampled, 229 (62.06%) contained food. Prey-s...
: The Squalus genus comprises a group of small demersal sharks occurring circumglobally, popularly known as dogfish sharks. This genus exhibits a conserved morphology, thus making correct morphological identification difficult. Considering these taxonomic problems and the scarcity of molecular data, the present study aimed to identify Squalus genus...
The yellowfin notothen Patagonotothen guntheri is an important fish species in the Marine Protected Area Namuncurá-Burdwood Bank (MPAN-BB) due to its high abundance and significant ecological role. Thus, diet composition and feeding habits were analyzed. To fulfill this purpose, percentage frequency of occurrence, prey-specific abundance, and prey-...
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...
A new species belonging to the Hoplias malabaricus complex from the Amazon basin, Brazil, is described. The new species is characterized by 15–16 predorsal scales, 37–39 lateral‐line scales, 5 scales from dorsal fin to lateral line, 38–39 vertebrae, iii‐iv, 7–8 anal‐fin rays, ii‐iv, 12–15 caudal‐fin rays, last vertical series of scales on the base...
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...
The guitarfishes Pseudobatos horkelii and Pseudobatos percellens meet the criteria for threatened status as Critically Endangered (CR) and Endangered (EN), respectively. Both species occur in the Southern Atlantic Ocean. Considering the lack of data on the genetic structure of these species, the present study evaluated the genetic variability and p...
The Hoplias malabaricus group encompasses six valid species and still is believed to harbors cryptic diversity. In this work, an integrative approach including morphological, DNA barcoding, and cytogenetic considerations was conducted to characterize a population of H. malabaricus from the Amazon basin that was recently allocated in the same mitoch...
Hypleurochilus fissicornis is a resident species of the intertidal and subtidal zones of Mar del Plata, Argentina. The specific reproductive biology was studied by means of both microscopic and macroscopic analyses. A total of 212 males and 223 females were analysed. Specimens were dissected and their gonads and livers were removed. The gonadosomat...
Brevoortia Gill 1861 is a genus of the Clupeidae (Teleostei) that includes six species of fishes commonly known as menhadens in eastern North America and “savelhas” or “saracas” in southeastern South America. Species of Brevoortia are important components of the marine food web of coastal ecosystems in the Atlantic and contribute significantly to f...
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...
Stingrays (Myliobatiformes) co-occur with many crocodilians (alligators, caimans and crocodiles) in non-marine environments of tropical and subtropical regions. However, predation by crocodilians on stingrays is rare. Here, we report two predation attempts (one unsuccessful, one unknown) on Potamotrygon motoro, by a southern spectacled caiman, Caim...
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...
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...
The detection of substituted or mislabeled seafood may have different consequences on consumers and the environment, including economic losses due to potential commercial fraud, public health effects, uncontrolled impacts on fish species of threatened status, and damage to populations due to overfishing. The molecular identification of processed me...
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...
Most Antarctic notothenioids exhibit clear geographic structure at large scales of spatial separation, generally between populations off different Ocean sectors. At smaller distances, there is great variation in the extent of population structuring. The Antarctic Peninsula and the archipelago of the South Shetland Islands are separated by a narrow...
The family Sciaenidae comprises about 300 species. The black drum Pogonias cromis was the only valid species of the genus. Herein, Pogonias courbina Lacepède 1803 is redescribed based on morphological and molecular evidence and a neotype is designated. Pogonias courbina is distinguished by the following characters: the occurrence of characteristic...
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...
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...
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)
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)
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...
Comparisons of the external morphology and analysis of osteological features of the postcranial and appendicular skeletons of three southwestern Atlantic flatfish species of the genus Paralichthys (P. isosceles, P. orbignyanus and P. patagonicus) were carried out. Bones are described, and detailed morphological, morphometric and meristic characteri...
Five adult paralichthyid specimens with various kinds of abnormalities are reported from the south-west Atlantic Ocean. These abnormal flatfish specimens represent the first records of wholly ambicoloured Paralichthys orbignyanus specimens having a deep notch between the eye and dorsal fin and a partially albinistic specimen having skeletal deformi...
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...
Mugil liza is distributed along the western Atlantic coast. It is a
commercially exploited species in Argentina, supporting a small-scale
fishery conducted by an artisanal fleet. Age determination of fishes
constitutes an important key issue for fishery management. The age,
growth, and recruitment of M. liza juveniles in Mar Chiquita coastal lagoon...
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 geograp...
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...
The diet and feeding strategy of Lepidonotothen nudifrons off the South Shetland Islands and the Antarctic Peninsula, as well as their variation in relation to ontogenetic stage (juvenile–adult) and sampling area, were determined by stomach contents analysis. Additionally, the trophic level of this species was estimated to determine its position wi...
Salinity gradients are critical habitat determinants for freshwater organisms. Silverside fishes in the genus Odontesthes have recently and repeatedly transitioned from marine to freshwater habitats, overcoming a strong ecological barrier. Genomic and transcrip-tomic changes involved in this kind of transition are only known for a few model species...
Based on data gathered during interviews with local artisanal fishermen and seahorses collected by them, Hippocampus patagonicus Piacentino & Luzzatto 2004 was found to occur in coastal waters of Monte Hermoso, southwestern Buenos Aires province, Argentina. High catches spanning several years and the identification of specimens confirm the presence...
Abstract:
Abstract This chapter is related to fish taxonomy, describing the importance of ladmarks-based morphometry in the context of integrative taxonomy. The general hypothesis of the chapter is that traditional morphological techniques are non conclusive in the description of new species, and thus they should be additional supported with taxono...
DNA barcoding has been used extensively to solve taxonomic questions and identify new species. Neotropical fishes are found in a wide variety of shapes and sizes, with a large number of species yet to be described, many of which are very difficult to identify. Characidae is the most species-rich family of the Characiformes, and many of its genera a...
List of intra-cluster distances.
Intra-cluster distances of the cluster formed based on NJ-K2P.
(XLS)
List of individuals used in this study.
This list indicates the species, sampling details, vouchers numbers, clusters defined using the different approaches (NJ, GMYC, BIN and ABGD) and Genbank acession numbers.
(XLSX)
List of pairwise between clusters distances.
Pairwise distances between the clusters formed based on NJ-K2P.
(XLS)
The first open-sea (non-coastal) Marine Protected Area (MPA) in Argentina was created in 2013 (and named “Namuncurá”), at Burdwood Bank, an undersea plateau located about 200 km south from Malvinas/Falkland Islands, SW Atlantic Ocean. This contribution represents the most recent and complete checklist of benthic organisms (mainly mega and macrofaun...
Background: Angelsharks (Genus Squatina) are distributed in the southern Southwest Atlantic Ocean between southeastern Brazil and central Patagonia. The endangered hidden angelshark Squatina occulta is reported in the literature as ranging from Espírito Santo, Brazil to Southern Uruguay. Its presence in Argentine waters has been suspected but not v...
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...
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...
This study explores the relationship between ecomorphology and trophic segregation in four closely related sympatric fish species (Teleostei, Sciaenidae) that are known to differ in their trophic habits. Only adult specimens were analyzed: 103 Cynoscion guatucupa, 77 Pogonias cromis, 61 Micropogonias furnieri, and 48 Menticirrhus americanus. The fo...
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...
The relationships between fish composition, connectivity and morphometry of 103 lagoons in nine
freshwater ecoregions (FEOW) between 2·83∘ S and 37·64∘ S were evaluated in order to detect possible
congruence between the gradient of species richness and similarities of assemblage composition. Most
lagoons included in the study were <2 km2, with a ma...
Reproductive biology of the Brazilian menhaden, Brevoortia aurea (Clupeiformes), was studied in Mar Chiquita Coastal Lagoon. Its abundance was analysed in relation to environmental variables, and the main biological-reproductive parameters were estimated: size at first maturity, batch and relative fecundity, frequency distribution of oocyte diamete...
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...
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...
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 = 70) from media, fishermen and scientific sampling, to estimate...
The present study evaluated the possible occurrence of cryptic species among Merluccidae from Argentina by examining sequences of cytochrome c oxidase subunit I (coI) mtDNA. This approach can discriminate Merluccius hubbsi and Merluccius australis; specimens with morphological diagnostic characters of Merluccius patagonicus formed a cohesive cluste...
The high intraspecific variation among and the conservative external morphology of Merluccius spp. have resulted in serious identification difficulties. Four hundred and twenty fresh and preserved specimens of Merluccius were analyzed, including the type series of Merluccius australis, M. tasmanicus and M. hubbsi; specimens of M. hubbsi from Argent...
The high intraspecific variation among and the conservative external morphology of Merluccius spp. have resulted in serious identification difficulties. Four hundred and twenty fresh and preserved specimens of Merluccius were analyzed, including the type series of Merluccius australis, M. tasmanicus and M. hubbsi; specimens of M. hubbsi from Argent...
In the present paper three specimens of the exotic common carp C. carpio were recorded for the first time in the inner zone of Mar Chiquita coastal lagoon (37°35025�S; 57°22021�W) (Fig. 1a,b) on 20 January 2014. Specimens were collected during summer samplings in lotic channelized tributaries of the lagoon. Body colouration, standard counts and mea...