Comportamento reprodutivo e estudo bioacústico de Pionites leucogaster leucogaster (Kuhl 1829) e Pionites melanocephalus melanocephalus (Linné 1758) (Aves: Psittacidae) em cativeiro

Pós-graduação em Ciências Biológicas (Zoologia) - IBB

Identificação e caracterização de elementos retrotransponíveis da família Rex do genoma de espécies do genêro Leporinus SPIX, 1829 (Teleostei: Anostomidae)

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Ascensão e queda do gabinete de 20 de novembro de 1827 (1827-1829)

A difícil relação de Dom Pedro I com o Legislativo durante o seu reinado (1822 - 1831) é explicada frequentemente pelos historiadores como consequência do absolutismo do imperador e de seu desprezo a conceitos da então nascente ideologia liberal, como Constituição e divisão de poderes. No entanto, um fato político pouco destacado em estudos recentes sobre o período coloca essa imagem em cheque - a reforma ministerial de 1827, realizada pelo imperador, que resultou na nomeação de três integrantes da Câmara dos Deputados para postos-chave do poder Executivo. O fato foi visto como referência às políticas creditadas ao modelo em voga na Inglaterra, nação que para muitos havia alcançado um relacionamento harmonioso entre Executivo e Legislativo, por conta da alocação de deputados nas cadeiras dos ministérios. Com as nomeações, Dom Pedro I objetivava diminuir os conflitos políticos com a Câmara. Ao mesmo tempo, procurava fazer frente a deputados da oposição que atacavam as políticas de governo no Parlamento, o que sustenta a hipótese de que a habilidade retórica dos deputados nomeados teria sido uma causa importante para sua integração ao Executivo. Esta tese, defendida pelos primeiros historiadores, é retomada aqui, por meio da análise de dois conceitos - king-in-parliament e retórica -, desenvolvidos pelo político franco-suíço Benjamim Constant. O autor demonstra como foi criada a fórmula king-in-parliament na Inglaterra do século 18 e de que maneira a perceberam os políticos brasileiros durante o Primeiro Reinado. Por meio de fontes primárias, ele levanta os temas que fomentavam os debates na Câmara dos Deputados e mostra como se deu a participação dos parlamentares nomeados ao Ministério em defesa do governo imperial naquelas discussões. Para o autor, o estudo sobre o Gabinete de 20 de novembro de 1827 permite refutar a caracterização 'absolutista' que, em vários momentos, é impingida ao ..

Dinâmica populacional no Sertão do Rio Pardo (1801-1829)

Pós-graduação em História - FCHS

A espacialidade no romance histórico francês no século XIX: Balzac, Hugo e Elémir

Pós-graduação em Estudos Literários - FCLAR

Bile acids as potential pheromones in pintado catfish Pseudoplatystoma corruscans (Spix &Agassiz, 1829): eletrophysiological and behavioral studies

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Oxygen consumption by the hermit crab, Clibanarius vittatus (Bosc, 1802) in declining oxygen tensions

1. 1. Oxygen consumption and its relationship to stepwise declining oxygen tension were examined in the common striped hermit crab, Clibanarius vittatus. 2. 2. Weight-specific oxygen consumption varied with body weight (W), according to the equation log V ̇o2 = 2.1639 + (-0.419 log W). 3. 3. Shell-less individuals of 1-2 g wet wt, where found to be oxygen conformers, since oxygen consumption ( V ̇o2) decreased with declining oxygen tensions. At ambient oxygen tensions below 35.4 mmHg, oxygen consumption remained constant, suggesting an increased ventilation. 4. 4. C. vittatus was found to survive in oxygen-free seawater for 5.5 hr, and no significant differences were found in oxygen consumption rates, for shelled and shell-less crabs, measured in water and air. 5. 5. The use of a K1 K2 index of oxygen independence, showed that larger animals were better able to maintain oxygen-independence during hypoxia than smaller individuals. 6. 6. C. vittatus displayed a pattern of no oxygen debt, once returned to normoxia. © 1983.

Chromosome mapping of retrotransposable elements Rex1 and Rex3 in Leporinus Spix, 1829 species (Characiformes: Anostomidae) and its relationships among heterochromatic segments and W sex chromosome

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Molecular barcode and morphological analyses reveal the taxonomic and biogeographical status of the striped-legged hermit crab species Clibanarius sclopetarius (Herbst, 1796) and Clibanarius vittatus (Bosc, 1802) (Decapoda: Diogenidae)

The taxonomic status of the species Clibanarius sclopetarius (Herbst, 1796) and Clibanarius vittatus (Bosc, 1802), which have sympatric biogeographical distributions restricted to the western Atlantic Ocean, is based only on differences in the colour pattern of the walking legs of adults. Their morphological similarity led to the suggestion that they be synonymised. In order to investigate this hypothesis, we included species of Clibanarius Dana, 1892 in a molecular phylogenetic analysis of partial sequences of the mitochondrial 16S rDNA gene and the COI barcode region. In addition, we combined the molecular results with morphological observations obtained from several samples of these two species. The genetic divergences of the 16S rDNA and COI sequences between C. sclopetarius and C. vittatus ranged from 4.5 to 5.9% and 9.4 to 11.9%, which did not justify their synonymisation. Differences in the telson morphology, chela ornamentation, and coloration of the eyestalks and antennal peduncle provided support for the separation of the two species. Another interesting result was a considerable genetic difference found between populations of C. vittatus from Brazil and the Gulf of Mexico, which may indicate the existence of two homonymous species.

Immatures of Dicrepidius Eschscholtz, 1829 and Dipropus Germar, 1839 (Elateridae, Elaterinae, Ampedini: Dicrepidiina)

The larva of Dicrepidius ramicornis (Palisot de Beauvois) and pupa of Dipropus brasilianus (Germar) are described. The larva of D. brasilianus is redescribed. The immatures of both species are illustrated. Comparisons among the known larvae of Dipropus species and between the two genera are presented. A provisional key to Dicrepidiina genera with known larvae is provided.

A new species of Leporinus Agassiz, 1829 from the upper Rio Paraná basin (Characiformes, Anostomidae) with redescription of L. elongatus Valenciennes, 1850 and L. obtusidens (Valenciennes, 1837)

Leporinus obtusidens Valenciennes, 1837 and L. elongatus Valenciennes, 1850 are redescribed based on the type specimens, including those of their junior synonyms, and recently collected specimens. Leporinus obtusidens is considered to be widespread, occuring in the river drainages of La Plata, São Francisco, and Parnaíba. Leporinus aguapeiensis Campos, 1945, described from the upper Rio Paraná, and L. silvestrii Boulenger, 1902, described from the Rio Paraguay, are considered junior synonyms of L. obtusidens. Leporinus elongatus is endemic to the Rio Jequitinhonha and Rio Pardo, two eastern Brazilian river basins, and the locality cited for the lectotype, Rio São Fransico, likely to be erroneous. Leporinus crassilabris Borodin, 1929, and L. crassilabris breviceps Borodin, 1929, both described from the Rio Jequitinhonha, are considered junior synynoms of L. elongatus. A new species of Leporinus, endemic to the upper Rio Paraná, very similar and sometimes mistaken with L. obtusidens, is formally described. In addition, comments on Leporinus pachyurus Valenciennes, 1850 and on L. bimaculatus Castelnau, 1855 are provided, and a lectotype for L. bimaculatus is selected.

Low temperatures reduce skin healing in the Jacaré do Pantanal (Caiman yacare, Daudin 1802)

Studies of skin wound healing in crocodilians are necessary given the frequent occurrence of cannibalism in intensive farming systems. Air temperature affects tissue recovery because crocodilians are ectothermic. Therefore, the kinetics of skin wound healing in Caiman yacare were examined at temperatures of 33°C and 23°C. Sixteen caiman were selected and divided into two groups of eight maintained at 23°C or 33°C. The studied individuals' scars were photographed after 1, 2, 3, 7, 15 and 30 days of the experimental conditions, and samples were collected for histological processing after 3, 7, 15 and 30 days. Macroscopically, the blood clot (heterophilic granuloma) noticeably remained in place covering the wound longer for the caiman kept at 23°C. Microscopically, the temperature of 23°C slowed epidermal migration and skin repair. Comparatively, new blood vessels, labeled using von Willebrand factor (vWF) antibody staining, were more frequently found in the scars of the 33°C group. The collagen fibers in the dermis were denser in the 33°C treatment. Considering the delayed healing at 23°C, producers are recommended to keep wounded animals at 33°C, especially when tanks are cold, to enable rapid wound closure and better repair of collagen fibers because such lesions tend to compromise the use of their skin as leather.