Natural history study of an understudied sea catfish species from Panama (Siluriformes: Ariidae)

The semi-anadromous sea catfish species Cathorops tuyra (Ariidae, Besudo sea catfish) from the Tropical Eastern Pacific has been found reproductively active in the freshwater rivers and lakes of the Panama Canal. Despite growing concerns for biodiversity, reports on natural history are lacking for many Neotropical sea catfishes. We aimed to provide data on the diet and seasonal timing of spawning of C. tuyra for an autochthonous, semi-anadromous, brackish water population from Rio Santa Maria and an allochthonous freshwater non-migrating population from Rio Chagres, an affluent to the Panama Canal, to understand how changing from semi-anadromous to residential lifestyle affects the natural history of a species. Fish from both sampling sites were dissected and information on stomach content, size, weight, parasitic load, sex, maturity, and number of eggs were recorded. In Rio Chagres, there was a female bias and individuals were larger and in pre-spawning mode compared to Rio Santa Maria. Parasite prevalence was low in Rio Chagres and zero in Rio Santa Maria. The diets were very similar between populations: gastropods, bivalves, and insects were the most important prey items in both rivers representing a diverse omnivorous diet that is similar to that of other catfishes.(AU)

El bagre de mar semi-anádromo Cathorops tuyra (Ariidae, Bagre besudo) del Pacífico Oriental Tropical se encuentra reproductivamente activa en los ríos y lagos del Canal de Panamá. A pesar de la creciente preocupación por la biodiversidad, faltan informes sobre la historia natural de muchos de los bagres Neotropicales. Nuestro objetivo es proporcionar datos básicos sobre la dieta y el momento del desove estacional de C. tuyra para una población autóctona semi-anádroma de agua salobre de Río Santa María y una población alóctona residente de agua dulce de Río Chagres para comprender cómo el cambio de un estilo de vida semi-anádromo a residencial afecta la historia natural de una especie. Se disecaron peces de ambos sitios de muestreo y se registró la información de contenido del estómago, tamaño, peso, carga parasitaria, sexo, madurez y número de huevos. En Río Chagres hubo un sesgo femenino y los individuos eran más grandes y estaban en modo pre-desove que en Río Santa María. La prevalencia de parásitos fue baja en el Río Chagres y cero en Río Santa María. Las dietas fueron muy similares entre poblaciones: gasterópodos, bivalvos e insectos fueron las presas más importantes en ambos ríos, lo que representa una dieta omnívora diversa, que es similar a la de otros bagres.(AU)

Ciências e educação em museus no final do século XIX / The sciences and education in museums at the close of the nineteenth century

Nas últimas décadas do século XIX, os museus de história natural estabeleceram sólidas redes de comunicação entre si, com seus diferentes públicos conformando o processo internacional caracterizado como o 'movimento dos museus'. Nesse contexto de intercâmbios apresenta-se o discurso que pronunciou William H. Flower, em 1889, sobre os papéis que cabiam aos museus de história natural. Neste trabalho analisa-se a sua influência no recém-inaugurado Museo de La Plata, Argentina, integrante desse circuito de museus que se ampliava no período.

In the closing decades of the nineteenth century, natural history museums established solid communication networks, and their different audiences formed what became known as the 'museum movement'. It was within this context of exchange that William H. Flower made his 1889 speech on the roles natural history museums should play. The article analyzes his influence on Argentina's Museo de La Plata, a member of this then-expanding circuit of museums.

La mirada que pasa: museos, educación pública y visualización de la evidencia científica / The passing eye: museums, public education, and the visualization of scientific evidence

En este artículo se presentan algunos problemas ligados a la historia de los museos. El énfasis en las capacidades y misiones a cumplir por los museos no necesariamente habla del poder de los museos para crear hábitos o imponer significados, pueden remitir a la debilidad de los mismos y a la necesidad de apelar a dicha retórica para atraer la atención de los favores y los presupuestos gubernamentales. Por ello, quedarse en el aspecto monumental, representativo o metafórico de los museos oscurece la historia de estas instituciones y de las prácticas allí consolidadas, naturalizando la separación entre espacio de investigación y espacios para el público y dejando para el historiador el papel de profano observador de las 'catedrales de la ciencia'.

In this examination of certain issues related to the history of museums. An emphasis on the functions and missions entrusted to museums does not necessarily reflect the power museums have to create habits or shape meanings. To the contrary, this may reflect the actual fragility of museums and their need to resort to rhetoric to attract governmental favors and funds. Therefore, concentrating on the monumental, representative, or metaphorical aspects of museums obscures the history of these institutions and of their consolidated practices, there by naturalizing the separation between research space and public space and leaving the historian to play the role of an uninitiated observer of the 'cathedrals of science'.

Três olhares de além-mar: o museu como espaço de divulgação da ciência / Three views from overseas: the museum as a setting for educational outreach in the sciences

Em sua primeira visita ao Brasil, em 2001, os professores Michel Van Praet, Jean Davallon e Daniel Jacobi, pesquisadores e profissionais do campo museal francês, discutiram a natureza complexa da experiência museal. Michel Van Praet salienta a particularidade dos museus de história natural e avalia o trabalho que realisou à frente do projeto de renovação da Grande Galeria da Evolução do Museu Nacional de História Natural, inaugurada, em 1994, em Paris. Jean Davallon discute a contribuição da semiótica e da teoria da recepção para analisar como a exposição comunica e como se dá a construção de sentido em seu interior. Daniel Jacobi define algumas características da divulgação das ciências nos museus e aponta dificuldades para a sua realização.

During their first visit to Brazil, in 2001, Michel Van Praet, Jean Davallon, and Daniel Jacobi – French researchers in the field of museology – discussed the complex nature of the museum experience. Professor Van Praet underscores the unique character of natural history museums and offers an evaluation of his work as head of the restoration project at Paris's Grande Gallery of Evolution, inaugurated in 1994. Professor Davallon discusses the contribution of semiotics and reception theory in analyzing how an exhibit communicates and how meaning is constructed within it. Dr. Jacobi defines some characteristics of the dissemination of science at museums and points to problems encountered in achieving this end.