20 articles in this issue
Marcelo Maia Pereira, Oswaldo Pinto Ribeiro Filho, Jose Cola Zanuncio, Rodrigo Diana Navarro, Jose Teixeira Seixas Filho, Christiano Demétrio de Lima Ribeiro (Autor)
Evaluation of semen characteristics after hormonal induction of the bullfrog could provide valuable information on the gametes of this species, which may be useful for projects related to artificial fertilization, animal improvement, and cryopreservation.... see more
Vanessa Majewski Algarte, Natália Silveira Siqueira, Liliana Rodrigues (Autor)
This study assessed the desiccation effects on biomass and algal density of periphyton in a subtropical lentic ecosystem. This experiment was conducted with only one in situ experimental desiccation event for 15 hours in a mature periphytic community. The... see more
Thaís Almeida Pereira, Sirlene Aparecida Felisberto, Valéria Oliveira Fernandes (Autor)
This study evaluated the influence of physical, chemical and physico-chemical variables of water on the biomass of periphyton community and verified the differences between six sampling sites over the course of São Mateus river: two upstream of the city o... see more
Alireza Koocheki, Mehdi Nassiri Mahallati, Hamed Mansoori, Rooholla Moradi (Autor)
Increasing resource use efficiency is crucial for enhancement of agricultural productions and reducing environmental hazards. For this purpose, improvement of Nitrogen use efficiency is an effective approach. Not only N loss occurs in field but also in pr... see more
Stéfano Zorzal de Almeida, Valéria de Oliveira Fernandes (Autor)
This study aimed at evaluating the effects of the intensive fish-farming and the domestic wastewater on the structure of the phycoperiphyton community. Three experimental supports containing artificial substrate were assembled in two sampling sites: IF – ... see more
Roger Paulo Mormul, Sidinei Magela Thomaz, Lisandro Juno Soares Vieira (Autor)
Aquatic macrophytes are an important component in the structure of lakes in Neotropical floodplains, for example, because they support a high diversity of invertebrates and vertebrates. In this paper, we tested whether or not the variability of macrophyte... see more
Rômulo Diego de Lima Behrend, Mariana Carolina Teixeira, Sue Ellen Prata Fernandes, Janielly Carvalho Camargo, Gisele Cristina Rosin, Alice Michiyo Takeda (Autor)
This study investigated the structure of the Oligochaeta and Chironomidae assemblages associated with monospecific stands of two submerged macrophyte species: Egeria najas and Hydrilla verticillata. Samplings were carried out in Leopoldo Backwater and Par... see more
Lívia Oliveira Ruiz Moreti, Luana Martos, Vânia Mara Bovo-Scomparin, Luzia Cleide Rodrigues (Autor)
Along the horizontal axis of reservoirs are generally recognized three zones (fluvial, transition and lacustrine) with distinct hydrodynamic and physical, chemical and biological properties. Quarterly samplings were conducted in 2002, in the limnetic regi... see more
Fabricio Barros de Sousa, Maria Gercilia Mota Soares, Luiza Prestes (Autor)
Fish is the main source of protein in the Amazon and fishing is one of the most important sources of income for the Amazonian population. Serrasalmus spilopleura is a species that have been increasingly consumed by riverside communities, although it is on... see more
Aldo Pacheco Ferreira, Eduardo Dias Wermelinger (Autor)
Seabirds play a significant role as bioindicators: they are conspicuous, relatively easy to observe, well-established studied group of organisms, and in the focus of public interest due to pollution in aquatic ecosystem. Systematically, a significant numb... see more
Jandeson Brasil, Fernando Bastos, José da Silva Mourão (Autor)
Exotic freshwater fish can have deleterious effects on local biodiversity, although these impacts often only become apparent many years after the introduction. Local Ecological Knowledge (LEK) may be a useful source of information in situations where form... see more
Michele Rocha dos Santos, Erasmo Renesto (Autor)
The genetic variability of Oligosarcus paranensis was estimated from a population collected in São Francisco river, Prudentópolis county in Paraná State (Brazil) using the electrophoresis in starch gel technique. Eleven enzymatic systems were analyzed: As... see more
Andréa Pontes Viana, Flávia Lucena Frédou, Caroline da Silva Montes, Rossineide Martins Rocha (Autor)
The environment quality of an industrial district on the river Pará, Amazon estuary, Brazil, based on the assessment of histological alterations and on the determination of catalase activity of the hepatic tissue of two fish species, Plagioscion squamossi... see more
Geraldo Eustáquio Valente Padilha, Júnia Aparecida Bernardes Afonso de Carvalho, Orion Boncompagni-Júnior, Fabrício Flávio Theophilo Domingos, Ralph Gruppi Thomé (Autor)
Reproductive activity of ‘piau gordura’ Leporinus piau was studied using biometric, macroscopic and microscopic analysis. A total of 74 specimens of L. piau were collected quarterly from January to December 2005 in a small deactivated hydropower pla... see more
Darlon Kipper, Tatia Leika Taguti, Andréa Bialetzki, Maristela Cavicchioli Makrakis, Gilmar Baumgartner, Paulo Vanderlei Sanches (Autor)
This study aimed to describe the early development of Clarias gariepinus, a species that has been introduced into various watersheds worldwide, in order to help the identification of its eggs, larvae and juveniles in natural environments. The material use... see more
Zilma Maria Almeida Cruz, Rodrigo Roque Lesqueves de Castro, Adriana Canal, Romildo Rocha Azevedo Júnior, Ary Gomes da Silva, Alessandro Ramos (Autor)
The effects of polluted water at three sites in the Marinho River, Brazil, on Oreochromis niloticus (Nile tilápia) were investigated using histological, hematological and biochemical approaches. Fish exposed to the impacted water demonstrated that histolo... see more
Emerson Contreira Mossolin, Douglas Fernando Peirò, Mariana Oliveira Rossingnoli, Livia Pinto Rajab, Fernando Luis Medina Mantelatto (Autor)
The aim of this study was to describe the population structure and reproduction of Macrobrachium jelskii from a stream in the central region of São Paulo State. A total of 1,215 specimens was collected monthly during one year (February 2008 to January 200... see more
Anderson Carlos Marçal, Ana Paula Couto Davel, Angelo Rafael Carpinelli, Patrícia Chakur Brum, Luciana Venturini Rossoni, Carla Roberta de Oliveira Carvalho (Autor)
Activation of ß2 adrenergic receptors by catecholamine or catecholamine-mimetic substances may enhance insulin secretion. We herein investigated KCl- and nutrient-stimulated insulin secretion in pancreatic islets isolated from ß2 knockout (ß2KO) mice. ß2K... see more
Maria Camila Mejia Torres, Adriana Sáenz Aponte (Autor)
Heterorhabditis sp SL0708 (Rhabditida: Heterorhabditidae) is a native entomopathogenic nematode from Alcalá, Valle del Cauca (Colombia), a natural enemy of insects that can be used for controlling Plutella xylostella L, Conotrachelus psidii Marshall and D... see more
Rhainer Guillermo-Ferreira, Kleber Del-Claro (Autor)
Sexual and species recognition, along with sexual color dimorphism, play an important role in the reproduction of many animal species. In this article, it was investigated if males of the dimorphic Neotropical damselfly Acanthagrion truncatum are able to ... see more