(English) Ending the year 2017: The Use of Ultraviolet Light as a Non-destructive Method for Revealing Fragments of Lost Pigmentation in Faded Alcohol-preserved Collection Specimens

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Andre L. Netto-Ferreira*researchgate logo  &  Kyle R. Luckenbill#

Laboratory of Ichthyology, Department of Zoology, Federal University of Rio Grande do Sul, Porto Alegre, Brazil. Museu Paraense Emílio Goeldi, Avenida Perimetral, 1901, 66077-530, Belém, PA, Brazil

# Department of Ichthyology, The Academy of Natural Sciences, 1900 Benjamin Franklin Parkway, 19103-1195 Philadelphia, PA, USA

ABSTRACT.

A method for visualizing previously pigmented areas of the body with the employment of black-light spectrum bulbs is described. Under ultraviolet (UV) light, fish musculature fluoresces, whereas melanophores absorb incident light, revealing nearly lost contrast between once strongly and poorly pigmented areas of the body that has faded over time. Although a yet unknown extent of melanophore preservation is necessary to expose such contrast, the method was successful on a partially faded holotype of Characidium fasciadorsale Fowler, a nearly completely faded holotype of Characidium etheostoma Cope, and most remarkably for the blackened, previously mold-infested and nearly destroyed holotype of Holotaxis laetus Cope. In the latter case, the method also allowed better recognition of scale pockets on the skin.

Link: http://www.bioone.org/doi/abs/10.1635/053.165.0112

Recently preserved specimen of Characidium zebra ANSP 167824 50 mm SL: A. under regular illumination; B. under regular plus black light illumination; C. under black light as single source of illumination.

Fig. 3. Holotype of Characidium etheostoma ANSP 8152, 37.1 mm SL: A. under regular illumination; B. under regular plus black light illumination; C. under black light as single source of illumination.

O laboratório de Ictiologia da UFRGS tem o prazer de dar boas-vindas ao novo professor do Departamento de Zoologia, o Dr. André Luiz Netto-Ferreira.

O Dr. André Luiz Netto-Ferreira é um pesquisador que tem contribuído significativamente para o conhecimento Ictiofauna Neotropical. Temos certeza de que sua experiência em ensino, pesquisa e orientação impactará de forma positiva toda a comunidade ictiológica, agora como parte do grupo de pesquisa do laboratório de Ictiologia da UFRGS

Sinceramente, os membros do laboratório esperam oferecer-lhe a melhor parceria e colaboração em esta nova etapa de sua vida profissional. 

La imagen puede contener: 1 persona, sentado e interior

La imagen puede contener: 1 persona

Population Genetic Structure of Cnesterodon decemmaculatus (Poeciliidae): A Freshwater Look at the Pampa Biome in Southern South America

Aline M. C. Ramos-Fregonezi Luiz Malabarba researchgate logoand Nelson J. R. Fagundes

The Pampas is a Neotropical biome formed primarily by low altitude grasslands and encompasses the southernmost portion of Brazil, Uruguay, and part of Argentina. Despite the high level of endemism, and its significant environmental heterogeneity, Pampean species are underrepresented in phylogeographic studies, especially aquatic organisms. The Pampean hydrological system resulted from a long history of tectonism, climate, and sea level changes since the Neogene. In this study, we examined the population genetic structure of Cnesterodon decemmaculatus, a freshwater fish species that occurs throughout most of the Pampa biome. We characterized mitochondrial and autosomal genetic lineages in populations sampled from Southern Brazil and Uruguay to investigate (1) the correspondence between current drainage systems and evolutionary lineages, (2) the demographic history for each genetic lineage, and (3) the temporal depth of these lineages. Overall, we found that the major evolutionary lineages in this species are strongly related to the main Pampean drainage systems, even though stream capture events may have affected the distribution of genetic lineages among drainages. There was evidence for recent population growth in the lineages occupying drainages closest to the shore, which may indicate the effect of quaternary sea-level changes. In general, divergence time estimates among evolutionary lineages were shallow, ranging from 20,000 to 800,000 years before present, indicating a geologically recent history for this group, as previously reported in other Pampean species. A Bayesian phylogeographical reconstruction suggested that an ancestral lineage probably colonized the Uruguay River Basin, and then expanded throughout the Pampas. This evolutionary scenario may represent useful starting models for other freshwater species having a similar distribution.

Link: https://www.frontiersin.org/articles/10.3389/fgene.2017.00214/full?&utm_source=Email_to_authors_&utm_medium=Email&utm_content=T1_11.5e1_author&utm_campaign=Email_publication&field=&journalName=Frontiers_in_Genetics&id=307730

FIGURE 2. Median-joining networks for (A) mtDNA ND2 haplotypes, and (B) nDNA Myh6 haplotypes. Circles size are proportional to the observed frequency of each haplotype. Cross marks represent mutational differences between haplotypes. (C) Geographic location of each mtDNA haplotype. Different colors represent the six genetic groups identified in BAPS analysis.

FIGURE 3. Maximum clade credibility tree among ND2 lineages found in Cnesterodon decemmaculatus individuals. Posterior probabilities (PP) are shown above the branches for selected nodes with PP > 0.8. Pie charts beside selected ancestral node represent the PP of ancestral location among each of the four populations according to the color scheme shown in the inlet.

PARABÉNS Rafael Costa Angrizani, NOVO DOUTOR DO LABORATÓRIO DE ICTIOLOGIA!!

Rafael Costa Angrizani defendeu na última sexta-feira, día 30 de novembro , sua tese de doutorado

DESVENDANDO RHAMDIA QUELEN  (QUOY & GAYMARD, 1824)

A banca esteve constituída pelo

                                                  Dr. Nelson Fagundes (UFRGS)

                                                  Dr. Tiago Pinto Carvalho (UFRGS)

                                                  Dr. André Luiz Netto Ferreira (UFPA)

                                         Orientado pelo Prof. Dr. Luiz Roberto Malabarba

PARABÉNS Fernanda Kuhn, NOVA MESTRE DO LABORATÓRIO DE ICTIOLOGIA!!

Fernanda Kuhn defendeu na última quinta-feira, dia 19 de outubro , sua Dissertação.

MORFOLOGIA DA MANDÍBULA FARINGEAL DE TRÊS ESPÉCIES DO GÊNERO CRENICICHLA (CICHLIFORMES: CICHLIDAE) E SUAS RELAÇÕES COM A DIETA EM RIACHOS DAS BACIAS DOS RIOS URUGUAI E JACUÍ, RIO GRANDE DO SUL.

A banca esteve constituída pelos:

Dra. Karine Bonato (UFRGS)

Dra. Rodrigo Fornel (URI-Erechim)

A new species of Ituglanis (Siluriformes: Trichomycteridae) from the rio Uruguai basin, southern Brazil

Juliano Ferrerresearchgate logo & Laura M. Doninresearchgate logo

ABSTRACT

A new species of Ituglanis associated to the grasslands of the Pampa biome is described from the rio Uruguai basin, southern Brazil. The new species is distinguished from its congeners by the low number of ribs and by a unique color pattern composed of an outer layer with scattered round black blotches equivalent in size to the eye circumference over a reddish brown background on the lateral surface of the body. We provide the genetic sequences of the mitochondrial gene Cytochrome c Oxydase subunit I (COI) for three of the paratypes and discuss aspects about the recent discovery of the new species.

Artigo: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252017000300214&lng=en&tlng=en

Fig. 1 Ituglanis inusitatus, new species, holotype, UFRGS 21829, 62.2 mm SL; arroio São João, Alegrete, rio Ibicuí basin, Rio Grande do Sul State, Brazil. Cut over the dorsal margin of the caudal peduncle is absent in remaining type specimens.

Fig. 2 Ituglanis inusitatus, new species, paratype, UFRGS 20201, 70.2 mm SL, c&s. Dorsal view of gill arches: basibranchials 2 to 4 (BB2-4), ceratobranchials 1 to 5 (CB1-5), epibranchials 1 to 4 (EB1-4), hypobranchials 1 to 3 (HB1-3), pharyngobranchial 3 (PB3), tooth plate attached to pharyngobranchial 4 (TP). Arrows indicate the process at distal portion of anterior margin of hypobranchial 1.

Ontogenetic variations and feeding habits of a Neotropical annual fish from southern Brazil.

Tatiana S. Dias, Ricardo J. Stein & Clarice B. Fialhoresearchgate logo

ABSTRACT. Knowing the feeding biology of a population and its ontogenetic aspects can help in understanding the functioning of fi sh assemblages, essential to the conservation of the habitat biodiversity in which these species are found. Annual fi shes complete their life cycle in temporary aquatic environments, existing in adult stage only for brief annual periods. Changes in the feeding habits between different size classes could indicate that a species belongs to diff erent feeding groups in diff erent growth phases. The aim of this work was to characterize the diet of Cynopoecilus fulgens Costa, 2002 in a temporary flooded area in the coastal plain of southern Brazil, taking into consideration possible alterations in feeding habits in different body size classes caused by ontogenetic changes, to explain the coexistence of these individuals in a short space of time. The diet analysis indicated that C. fulgens is a generalist, consuming small crustaceans and autochthonous insects. Intraspecific differences in diet were determined when compared between nine classes of standard length. Adults fed mainly on autochthonous insects, and juveniles ingested mostly crustaceans, with the population being separated into two trophic groups: invertivores and invertivores with a tendency towards zooplanktivory. It is possible to conclude that the ontogenetic changes in the diet of C. fulgens are related to morphological restrictions due to the size of the individuals, since feeding competitive relations are probably not so evident.

link: http://www.scielo.br/pdf/isz/v107/1678-4766-isz-107-e2017020.pdf

Fig. 2. General view of the sampling points of Cynopoecilus fulgens Costa, 2002 in a temporary flooded area in the coastal plain of State of Rio Grandedo Sul, Brazil

Fig. 4. Costello graphics showing the proportion of food items found in the diet of nine standard length classes of Cynopoecilus fulgens Costa, 2002 in a temporary flooded area in the coastal plain of State of Rio Grande do Sul, Brazil.