Publicações - ciências biológicas
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F E Possatto;
Matt K Broadhurst;
Charles A. Gray;
Henry Louis Spach;
Marcelo Renato Lamour
Palavra-chave:
Biodiversity hotspot;
estuary function;
fish community;
fish distribution;
Paranagua ́ estuarine complex
Áreas do conhecimento:
Ciências Biológicas; Bioquímica dos Microorganismos; Enzimologia
resumo ...
Benthic trawl surveys were performed to quantify the spatiotemporal distributions of teleosts and key abiotic associations throughout an ecologically important estuary within Brazil’s Atlantic Forest biosphere. Approximately 52000 fish (51% juveniles) representing 75 species were sampled, with residents accounting for 36 and 61% of total species and individuals respectively. Five artisanally important species comprised 77 and 81% of individuals and biomass respectively. Cathorops spixii was most abundant (>40% of total), whereas Stellifer rastrifer, Aspistor luniscutis, Sphoeroides greeleyi and S. testudineus collectively contributed towards 37 and 34% of individuals and biomass respectively. The abundance of A. luniscutis, C. spixii and S. rastrifer was negatively associated with salinity, whereas the presence of the latter two species was also positively associated with temperature, and S. greeleyi and S. testudineus (mostly adults) were more abundant in deeper areas. These relationships seemed to be affected by species-specific reproductive (S. rastrifer, C. spixii and A. luniscutis), habitat (S. greeleyi and S. testudineus) and prey preferences (juvenile C. spixii and A. luniscutis). Protection for these various species may be achieved via immediate fishing effort regulations, but more research is required to manage other anthropogenic effects. Such work should be a priority to ultimately preserve what is one of the most important South American biodiversity areas.
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LEITE, WELLINGTON C.;
COX, MICHAEL M.;
GALVÃO, CAROLINA W.;
SAAB, SÉRGIO C.;
Jorge Iulek;
ETTO, RAFAEL M.;
STEFFENS, M;
CHITTENI-PATTU, SINDHU;
STANAGE, TYLER;
KECK, JAMES L.
Palavra-chave:
Herbaspirillum seropedicae;
recArecX;
resposta SOS;
recA
Áreas do conhecimento:
Ciências Biológicas; Bioquímica dos Microorganismos; Enzimologia
resumo ...
The bacterial RecA protein plays a role in the complex system of DNA damage repair. Here, we report the functional and structural characterization of the Herbaspirillum seropedicae RecA protein (HsRecA). HsRecA protein is more efficient at displacing SSB protein from ssDNA than Escherichia coli RecA protein. HsRecA also promotes DNA strand exchange more efficiently. The three dimensional structure of HsRecA-ADP/ATP complex has been solved to 1.7 Å resolution. HsRecA protein contains a small N-terminal domain, a central core ATPase domain and a large C-terminal domain, that are similar to homologous bacterial RecA proteins. Comparative structural analysis showed that the N-terminal polymerization motif of archaeal and eukaryotic RecA family proteins are also present in bacterial RecAs. Reconstruction of electrostatic potential from the hexameric structure of HsRecA-ADP/ATP revealed a high positive charge along the inner side, where ssDNA is bound inside the filament. The properties of this surface may explain the greater capacity of HsRecA protein to bind ssDNA, forming a contiguous nucleoprotein filament, displace SSB and promote DNA exchange relative to EcRecA. Our functional and structural analyses provide insight into the molecular mechanisms of polymerization of bacterial RecA as a helical nucleoprotein filament.
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Margaret S. Nardelli;
Norma C. Bueno;
Thelma V. Ludwig;
Ana Tereza Bittencourt Guimaraes
Brazilian Journal of Biology (Impresso),
v. 76,
n. 2,
p. 1-13,
2016
Palavra-chave:
comunidade fitoplanctônica;
bioestatística;
ecologia numérica
Áreas do conhecimento:
Ciências Biológicas; Ecologia numérica
resumo ...
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ROS, MACARENA;
LACERDA, MARIANA B.;
VÁZQUEZ-LUIS, MAITE;
Setuko masunari;
GUERRA-GARCÍA, JOSÉ M.
Palavra-chave:
Secondary spread;
Habitat use;
Invasive species;
Artificial substrata;
Foulçing community
Áreas do conhecimento:
Ciências Biológicas; Ecologia de Comunidades
resumo ...
Knowledge of the habitat use patterns of introduced species in their native or naturalized range can provide unique insights into processes of secondary dispersal and colonization of natural habitats. Caprellid amphipods are small mobile marine epibionts with limited natural dispersal. The global distribution of some caprellid species is mostly the result of anthropogenic transport; however, their subsequent spread beyond artificial habitats is poorly understood. A biogeographic approach, mainly focused on the native-range ecology of introduced and common fouling caprellid amphipods of southern Europe, was used to understand the implications of habitat use patterns for predicting their spread in the introduced regions. Specifically, abundance and composition of caprellid populations were compared among different primary habitats including artificial (floating pontoons), sheltered and wave-exposed rocky shores along the southern and southeastern coasts of Brazil. The findings indicated that artificial habitats act as reservoirs for globally distributed species in both their native and introduced ranges, while endemic species are more scarcely represented. Environmental conditions provided by primary habitats appear important in structuring caprellid assemblages on secondary substrata (basibiont species). Most wide-ranging caprellids were negatively correlated with the level of wave exposure, being more abundant in sheltered (artificial or natural) than in exposed habitats. In this context, Caprella scaura and Paracaprella pusilla, the two introduced caprellids recorded in the Mediterranean, where they are virtually restricted to artificial habitats, may become established in sheltered and even highly polluted natural habitats but hardly colonize wave-exposed rocky shores.
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Aline Dutra Madalozzo;
Viviane Paula Martini;
Keyla Kaori Kuniyoshi;
Emanuel Maltempi de Souza;
Fabio de Oliveira Pedrosa;
Gisella Maria Zanin;
MITCHELL, DAVID ALEXANDER;
KRIEGER, NADIA
Palavra-chave:
lipase;
metagenômica;
imobilização
Áreas do conhecimento:
Ciências Biológicas; Enzimologia
resumo ...
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Thamara Zacca Bispo Taumaturgo;
Olaf Hermann Hendrik Mielke;
Tomasz W. Pyrcz;
Fernando Maia da Silva Dias;
Mirna Martins Casagrande;
PIERRE BOYER
Palavra-chave:
Argyrophorus;
Haywardella;
Nymphalidae;
Phylogeny;
Taxonomy
resumo ...
The first cladistic analysis of the genus Pampasatyrus Hayward, 1953 is presented based on morphological evidence. The monophyly of Pampasatyrus is corroborated with previous molecular hypothesis, and supported by two synapomorphies and six homoplastic characters. Haywardella Herrera, 1966 stat. rest. is recovered as sister group of Pampasatyrus, and both are closely related to a clade composed by Argyrophorus Blanchard, 1852, Etcheverrius Herrera, 1965 and Quilaphoethosus Herrera, 1966. Furthermore, three new subspecies are described: Pampasatyrus gyrtone biezankoi Zacca, Pyrcz, Mielke & Casagrande, ssp. n. from southern Brazil, Pampasatyrus reticulata gagarini Zacca, Pyrcz, Mielke & Casagrande, ssp. n. from São Paulo and Rio de Janeiro, Brazil, and Pampasatyrus glaucope eberti Pyrcz & Zacca, ssp. n. from São Paulo, Brazil. Neotypes to Faunula johanna Weymer, 1911 and Neomaenas reticulata Weymer, 1907 are herein designated. Lectotypes to Epinephele gyrtone Berg, 1877, Cosmosatyrus nilesi Weeks, 1902, Epinephele friedenreichi Staudinger, 1888 and Satyrus quies Berg, 1877 are also designated. A catalogue, diagnosis, illustrations, photos and distributional maps are provided for all the taxa, including an identification key.
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FLORIANO, CARLA FERNANDA BURGUEZ;
PALADINI, ANDRESSA;
Rodney Ramiro Cavichioli
Palavra-chave:
Cylindrostethinae;
Neotropical;
Taxonomy;
water spides
resumo ...
Water striders (pond skaters) occur worldwide and are conspicuous in most aquatic environments, but the taxonomy of many groups remains unresolved. Here we revise the South American species of the Palaeo- and Neotropically distributed Cylindrostethus Mayr, 1865, a genus characterised by its long, cylindrical body and fast jumping-gliding locomotion. Using a cladistic analysis of morphological characters, we confirm the subdivision of Neotropical Cylindrostethus into two major groups. Nine species of Cylindrostethus are recognised from South America, one of which was recently discovered in Amazonian Brazil and Peru: C. bassleri Drake, 1952; C. bilobatus Kuitert, 1942; C. drakei, sp. nov.; C. hungerfordi Drake & Harris, 1934; C. linearis (Erichson, 1848); C. meloi Floriano & Cavichioli, 2013; C. palmaris Drake & Harris, 1934; C. podargus Drake, 1958; C. regulus (White, 1879). Two species are placed in synonymy: (C. podargus = C. stygius Drake, 1961, syn. nov.); (C. linearis = C. erythropus (Herrich-Schäffer, 1850), syn. nov.). A key to the nine species is provided, along with detailed descriptions and illustrations.
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COLLIN, RACHEL;
FREDERICQ, SUZANNE;
FRESHWATER, D. WILSON;
GILBERT, EDWARD;
MASLAKOVA, SVETLANA;
MIGLIETTA, MARIA PIA;
Rosana Moreira da Rocha;
Rodríguez, Estefanía;
THACKER, ROBERT
Palavra-chave:
ASCIDIACEA;
Taxonomia
Áreas do conhecimento:
Ciências Biológicas; Bioquímica dos Microorganismos; Enzimologia
resumo ...
To address this challenge, we have developed a publicly available on-line illustrated multilingual glossary and translation tool for technical taxonomic terms using the Symbiota Software Project biodiversity platform. Illustrations, photographs and translations have been sourced from the global community of taxonomists working with marine invertebrates and seaweeds. These can be used as single-language illustrated glossaries or to make customized translation tables. The glossary has been launched with terms and illustrations of seaweeds, tunicates, sponges, hydrozoans, sea anemones, and nemerteans, and already includes translations into seven languages for some groups. Additional translations and development of terms for more taxa are underway, but the ultimate utility of this tool depends on active participation of the international taxonomic community.
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SIEWERT, RICARDO RUSSO;
ZACCA, THAMARA;
Mielke, Olaf Hermann Hendrik;
Mirna Martins Casagrande
Palavra-chave:
Carcharodini;
Cladistic;
Pyrginae;
Taxonomy
resumo ...
Abstract. A new species of Sophista Plötz, 1879 from north-east Brazil (Bahia) is described: Sophista spectrum Siewert, Zacca, Mielke & Casagrande sp. nov.T
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BORGES, PATRICIA DAMMSKI;
LUDWIG, SANDRA;
Walter Antonio Boeger
Palavra-chave:
Limnoperna fortunei;
genética de populacoes;
espécie invasora
Áreas do conhecimento:
Ciências Biológicas; Ecologia; Ecologia Aplicada
resumo ...
The invasive bivalve Limnoperna fortunei (Dunker 1857) was introduced in South America in 1991, with the first occurrence in Brazil in 1998. In the Iguassu River, the species was recorded in 2001; however, it is unknown how it was introduced and spread. Adults and larvae were sampled in Iguassu and Paraná Rivers, and the genetic profiles were compared. The species was absent in the upper reaches and only larvae were found, in low densities, in intermediary reaches. The L. fortunei populations from the lower Iguassu River presented no genetic differentiation among themselves, suggesting strong connectivity, and were significantly different from the Paraná River populations, most likely because of Iguassu Falls. Furthermore, the results suggest that the Paraná River represents the source of propagules to the Iguassu River. Generally, no significant differences were observed between the genetic structure inferred from adults and larvae. Only the population from the Iguassu National Park, a lotic environment, differed from the remaining subpopulations. The characterization of genetic profile using larval stages of L. fortunei populations was satisfactory, and represents an important protocol for studying the population genetics of aquatic species with planktonic larval stages.
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