Emília W. Wendt, defendeu na última quarta-feira, día 29 de abril , sua tese de doutorado


A banca esteve constituída pelos

Prof. Dr. Rogerio Tubino Vianna –  FURG/ICB/LABIPOA/PPGBAC

Prof. Dr. Augusto Ferrari – FURG/ICB

Prof. Dr. Brian Sidlauskas – Fisheries Oregon State University, Corvallis, USA.

Orientada pelo Prof. Dr. Tiago Pinto Carvalho

Co-orientada pelo Prof. Dr. Luiz Roberto Malabarba


Rapid assessment of the ichthyofauna of the southern Guiana Shield tributaries of the Amazonas River in Pará, Brazil



The Northern Pará Drainage System encompasses the left-bank tributaries of the Amazonas River in the southern Guiana Shield region of Pará state, Brazil. Five of the region’s state protected areas are considered strategic for the conservation of its biodiversity. In the present study, we assessed the ichthyofauna of the five state protected areas of the Northern Pará Drainage System. Seven expeditions were conducted between January 2008 and January 2009, which surveyed stretches of the Cuminá, Cuminapanema, Curuá, Jari, Mapuera, Nhamundá, and Paru rivers. These surveys yielded 286 species belonging to 38 families and eight orders, including seven new records of fish species for Brazil, six of which are also new records for the Amazon basin. Our results provide a valuable database for future research and conservation programs in the protected areas of the region.

Keywords: Northern Pará Drainage System; protected areas; Amazon; inventory; fish


Figure 5 Examples of the fish species collected in the southern Guiana Shield tributaries of the Amazonas River, in the five state protected areas of the Northern Pará Drainage System, in northern Brazil. (A) Astyanax anterior, MPEG 18207, 81.6 mm SL. (B) Hyphessobrycon cf. agulha, MPEG 18181, 25.8 mm SL; (C) Hyphessobrycon georgettae, MPEG 34100, 19.0 mm SL; (D) Jupiaba abramoides, MPEG 18204, 70.8 mm SL; (E) Jupiaba atypindi, MPEG 17244, 39.8 mm SL; (F) Jupiaba potaroensis, MPEG 18159, 20.9 mm SL; (G) Moenkhausia chrysargyrea, MPEG 18204, 61.8 mm SL; (H) Phenacogaster simulata, MPEG 15597, 22.8 mm SL; (I) Bryconops aff. affinis, MPEG 18149, 22.3 mm SL; (J) Bryconops cf. colaroja, MPEG 17232, 94.5 mm SL; (K) Corydoras sp., MPEG 19162, 22.2 mm SL; (L) Corydoras baderi, MPEG 18238, 26.9 mm SL; (M) Corydoras guianensis, MPEG 15715, 25.8 mm SL. This figure is in color in the electronic version



Mateus Santos de Souza apresentou na última sexta-feira, dia 28 de fevereiro, sua Dissertação:


A banca esteve constituída pelo:

Dr. Marcelo Gehara (Rutgers University)

Dr. Sandro Bonatto (PURCS)

Dr. Luiz Roberto Malabarba (UFRGS-PPGBAN)

Orientado pelo Prof. Dr. Neslon Jurandi Rosa Fagundes

Co-orientado pela: Dra. Andréa Tonolli Thomaz


Phylogenetic relationships of a new genus and species of stevardiine fish (Characiformes: Characidae: Stevardiinae) from the Río Amazonas basin, Peru


Varicharax nigrolineatus, a new genus and species of stevardiine fish, is described from the Río Amazonas basin, Peru, based on a comprehensive phylogenetic comparison with other characids. Two data sets (A: combined morphological and molecular matrix, 474 species and 6,653 characters; B: morphological matrix, 216 species and 524 characters) were used to estimate the phylogenetic relationships of the new genus. Morphological and molecular data from these data sets were taken from two previously published matrices on characids. Varicharax nigrolineatus is phylogenetically diagnosed by 18 autapomorphies in total (from both data sets), which are related to different anatomical characteristics of the neurocranium, body, and fins. Furthermore, V. nigrolineatus can be easily differentiated from all characids (except Acrobrycon in part) by the following combination of characters: the presence of a hypertrophied caudal‐fin squamation on the lower caudal‐fin lobe forming a remarkable pouch‐like structure, consisting of multiple series of large adjacent scales (being almost similar or slightly more pronounced in males than in females), the presence of caudal‐fin bony hooks on the lower lobe in adult males, complete lateral line, and a dark mid‐lateral stripe that extends from the posterior border of the head to caudal peduncle. In the resulting topologies from both data sets, the phylogenetic placement of V. nigrolineatus was well supported within Stevardiinae. Additionally, V. nigrolineatus was resolved within the tribe Stevardiini as sister group of a clade formed by Chrysobrycon + Pseudocorynopoma and Corynopoma + Gephyrocharax in the final hypothesis from the combined data set, whereas in the final topology from the morphological data set, V. nigrolineatus was placed as sister group of a clade comprised of Acrobrycon and the Stevardiini without Argopleura.

Phylogenetic relationships of Varicharax nigrolineatus within Stevardiinae obtained from the data set A (combined molecular and morphological matrix) (L = 58,206; Fit = 968.263752) using extended implied weighting. Node numbers are indicated above branches. Support values are presented below branches and separated by a slash (Absolute frequency/GC value). Full tree available as Figure S1

Varicharax nigrolineatus, (a) MUSM 60288, male, holotype, 36.1 mm SL; (b) MUSM 58235, female, paratype, 27.9 mm SL, collected with holotype

First record of Astyanax bifasciatus Garavello & Sampaio, 2010 (Teleostei, Ostariophysi, Characidae) in the Piquiri river basin, upper Paraná river basin

Mayara P. Neves, Priscilla C. Silva, Rosilene L. Delariva, Clarice B. Fialho, Andre L. Netto-Ferreira


Astyanax bifasciatus Garavelo & Sampaio, 2010 was originally described as endemic to the Iguaçu river basin. Between March 2017 and January 2018, specimens of A. bifasciatus were sampled during expeditions to headwater streams of the Piquiri river basin, upper Paraná river basin. The identification was confirmed both by morphological and molecular analyses, representing, therefore, the first record of the species outside of the basin of the Iguaçu River. In addition, the lack of structuring in the haplotype network confirms that the representatives of A. bifasciatus from both basins appear to comprise a single population.

Keywords: Distribution range, DNA barcode, endemicity, headwater streams, species identification

Figure 2. Astyanax bifasciatus. A. UFRGS 26235, 85.0 mm SL, Arquimedes stream, lower Iguaçu river basin, Paraná, Brazil. B. UFRGS 26231, 91.3 mm SL, Carreira stream, Piquiri river basin, upper Paraná river basin, Paraná, Brazil.

Fishes community composition and patterns of species distribution in Neotropical streams

Laísa Wociechoski Cavalheiro  & Clarice Bernhardt Fialho


The ichthyofauna of streams in the Neotropical region is not yet fully known. This study aims to investigate the ichthyofauna composition of six streams of the Ijuí River sub-basin, Rio Grande do Sul State, inserted in the Uruguay River basin, as to contribute to the knowledge of fishes species richness and distribution in the south of Brazil. Sampling was carried out between July 2015 and May 2016, bimonthly, using the technique of electric fishing to collect the fishes. Spatial variations (per sampled stream) in the ichthyofauna composition were tested with a permutational multivariate analysis of variance. In total, we collected 5,029 individuals from 55 species, 13 families and five orders. From these species, 17 are endemic to the Uruguay River basin. Five species alone represented approximately 70% of the ichthyofauna abundance sampled. Our hypothesis that the fish community composition is not homogeneous along the streams sampled was confirmed and we observed that species complexity increases from the upstream closest area to the downstream according to the river continuum concept.

Keywords: Abundance; Characidae; Heptapteridae; Loricariidae; Richness; Uruguay River basin

Figure 1 Location of the sampled streams in the Ijuí River sub-basin and its respective position into the Uruguay River hydrographic basin, Brazil.

Biogeography, habitat transitions and hybridization in a radiation of South American silverside fishes revealed by mitochondrial and genomic RAD data

Lily C. Hughes , Yamila P. CardosoJulie A. SommerRoberto CifuentesMariela CuelloGustavo M. SomozaMariano González‐CastroLuiz R. MalabarbaVictor CussacEvelyn M. HabitRicardo Betancur‐R & Guillermo Ortí


Rivers and lake systems in the southern cone of South America have been widely influenced by historical glaciations, carrying important implications for the evolution of aquatic organisms, including prompting transitions between marine and freshwater habitats and by triggering hybridization among incipient species via waterway connectivity and stream capture events. Silverside fishes (Odontesthes) in the region comprise a radiation of 19 marine and freshwater species that have been hypothesized on the basis of morphological or mitochondrial DNA data to have either transitioned repeatedly into continental waters from the sea or colonized marine habitats following freshwater diversification. New double digest restriction‐site associated DNA data presented here provide a robust framework to investigate the biogeographical history of and habitat transitions in Odontesthes. We show that Odontesthes silversides originally diversified in the Pacific but independently colonized the Atlantic three times, producing three independent marine‐to‐freshwater transitions. Our results also indicate recent introgression of marine mitochondrial haplotypes into two freshwater clades, with more recurring instances of hybridization among Atlantic‐ versus Pacific‐slope species. In Pacific freshwater drainages, hybridization with a marine species appears to be geographically isolated and may be related to glaciation events. Substantial structural differences of estuarine gradients between these two geographical areas may have influenced the frequency, intensity and evolutionary effects of hybridization events.

(a) Marine and freshwater areas currently occupied by species of Odontesthes in southern South America, and photograph of Odontesthes perugiae by Y. P. Cardoso. (b) Sampling localities for ddRAD‐sequenced samples (see Appendix S1: Table S2 for description of population codes). (c) 2006 Morphological phylogenetic hypothesis for all Odontesthes species (Dyer, 2006), although lacking the newly described O. yacuman (Wingert, Ferrer, & Malabarba, 2017). Marine lineages are shown with grey branches. Shapes with black outlines indicate that cytb or ddRAD data were collected for this study for that species. (d) Maximum likelihood molecular hypothesis based on seven nuclear genes and cytb (Campanella et al., 2015), including three outgroups that inhabit the northern Pacific Ocean that are not otherwise included in this study. Branch lengths for molecular hypotheses are shown in substitutions per site, and grey branches indicate marine lineages. Species included in this study have black outlines around their shapes

Geographic distribution extension of Landonia latidens Eigenmann & Henn, 1914 (Characidae, Stevardiinae) in coastal drainages of Peru

Vanessa Meza-Vargas, Dario Faustino-FusterJosé Marchena,

Hernán Ortega


The monotypic genus Landonia Eigenmann & Henn, 1914 was only known from its type locality in western Ecuadorian drainages. Recent collections revealed the presence of Landonia latidens Eigenmann & Henn, 1914 in Chira and Piura river basins in Peru. Thus, the distribution of this species is extended, constituting the southernmost record of the species.


Length-Weight Relationships for 16 Snapper Fishes fromVisakhapatnam Coast, India

Govinda Rao Velamala, Muddula Krishna Naranji, Andre Luiz Netto-Ferreira, Ramesh Babu Kondmudi.


This study presents the length-weight relationships (LWRs) for 16 lutjanid species from Visakhapatnam coastal waters, India (16.98°N-20°.2 N, Long. 82.19°-86.53°E). The samples were collected fortnightly between December 2013 and December 2018 from commercially operated fishing gears viz.: the reef fish trap with single and double horse necked funnel (mesh aperture size 4.5 cm) trap measured about 3 ft in length, 4 ft in width and 2.5 ft in height, having a volume of 30 cu ft. The soak time was between 18 to 22 h. Gill nets made of monofilament nylon netting with a mesh size of 80 mm were used in the collection of snapper fishes. The nets were operated 3 h before morning (sunrise) and hauled 1 h after the sunrise. The depth of the net operated varied from 3 to 8 m, whereas the head rope of the net is around 20–25 m in length. The hook number 8 to 11 is used for the fishing of snapper fishery resources in water depth more than 75 m in Visakhapatnam region. The soak time varied from 5 to 10 h. The bottom trawlers (43 mm with a cod end mesh size of 15–25 mm) a depth range of 10 to 55 m, whereas during each fishing period, 3 to 4 hauls are made with a towing period ranging from 1 to 2 h; trawlers (a depth regime of 12 to 55 m, with a mesh size of 400 mm to 25 mm at the cod end). Around 3 to 6 hauls are made during each fishing trip with a towing period of 1to 2 h. All LWRs were significant with r2 values ranged from 0.9504 for Lutjanus lemniscatus to 0.9951 for Lutjanus fulvus and ‘b’ values ranging from Pinjalo pinjalo for 2.5982 Lutjanus quinquelineatus for 3.4993. In addition, new maximum total length for each of the three species L. indicus, L. xanthopinnis and P. pinjalo was also found. The parameters are found great importance to evaluate the relative condition of populations, biology, ecology, species management and their fisheries and stock assessment.


Table 1 Descriptive statistics and length-weight relationship of sixteen snapper fish species from the Visakhapatnam coast, India

First record of the non‐native Xiphophorus hellerii (Cyprinodontiformes: Poeciliidae), in the Iguazu River Basin, Paraná, Brazil

Crislei Larentis, Mara Cristina Baldasso, Bruna Caroline Kotz Kliemann, Mayara Pereira Neves, Arielli Giachini Zavaski, Leticia Mazzuco Sandri, Ana Cristina Ribeiro, Daniel Pereira de Sousa Simões Xavier, Giovanni de Oliveira Nagasawa Costa, Rosilene Luciana Delariva

Members of the order Cyprinodontiformes are cosmopolitan in tropical and temperate latitudes, widely distributed in freshwater and saline habitats (Rosen & Bailey, 1963). In this order, the family Poeciliidae comprises 42 genera with about 353 species (Nelson, Grande, & Wilson, 2016), which are small and laterally compressed fishes, with body form ranging from extremely elongated (e.g., Tomeurus) to deep‐bodied (e.g., Phallichthys, Carlhubbsia) (Lucinda,
2003). Some species have been introduced in many countries by ornamental aquarists (Magalhães & Jacobi, 2017), and as an alternative measure to biological control of mosquitoes (Azevedo‐Santos, Vitule, Pelicice, & García‐berthou, 2016). Seven species were already registered in Brazilian headwater streams (Magalhães & Jacobi, 2017). The main introduction vector of Poecilids in Brazil is the aquarium hobby, a practice that has gained popularity because of the ease in obtaining a diversity of attractive species. However, certain difficulties in the care of ornamental fish, such as the excessive growth and aggressiveness of some species, motivate the aquarists to release their unwanted fishes into artificial or natural aquatic environments (Magalhães & Jacobi, 2013). This illegal release has introduced not only Poecilia reticulata Peters, 1859 into Brazilian streams, but also some species of Xiphophorus (Magalhães & Jacobi, 2017).

The drainage area of the Iguazu River Basin cross different geological and geomorphological units (Parolin, Ribeiro, & Leandrini, 2010). It has many waterfalls, most notably the Iguazu Falls (82 m high), formed in a geological event dating from the Cretaceous period (Parolin et al., 2010), and which likely generated a cladogenic event for many fish species in the Iguazu River. These waterfalls, located near the mouth of this river, are classified as level‐three barriers for the movement of fish, promoting the isolation of the fish fauna. Additionally, there are more six artificial barriers along the Iguazu River (Baixo Iguaçu, 2019; Baumgartner et al., 2012). The presence of these barriers ensures that the species do not colonize other regions, unless they are aided by human intervention (Rahel, 2007). Such geographical isolation guaranteed to the Iguazu River Basin a small‐sized fish fauna, highly endemic (Baumgartner et al., 2012), and therefore a global biodiversity ecoregion (Abell et al., 2008; Hales & Petry, 2015). This basin is particularly vulnerable to non‐native fish introductions, however, a recent study showed that 27 fish species have already been introduced in the Iguazu River Basin (Gubiani et al., 2018). Such introductions cause negative impacts on endemic fish fauna, increasing the risk of extinctions (Daga, Debona, Abilhoa, Gubiani, & Vitule, 2016; Gubiani et al., 2018).


FIGURE 1 Geographic location of sampling sites (black circles) in the lower Iguazu River Basin, highlighting the Bom Retiro stream (black star)

FIGURE 2 Xiphophorus hellerii sampled in Bom Retiro stream, lower Iguazu River Basin, Brazil. (a) adult individual (68.8 mm) (TL); (b) juvenile individual (40 mm) (TL). (TL‐total length)