Brazilian Institute of Environment and Renewable Natural Resources

About: Brazilian Institute of Environment and Renewable Natural Resources is a government organization based out in Brasília, Brazil. It is known for research contribution in the topics: Population & Deforestation. The organization has 549 authors who have published 732 publications receiving 13999 citations. The organization is also known as: IBAMA.

Embarcações motorizadas: uma ameaça aos peixes-boi marinhos (Trichechus manatus) no Brasil

Abstract: Borges, J.C.G., Vergara-Parente, J.E., Alvite, C.M.C., Marcondes, M.C.C & Lima, R.P. Motorboat: a threat to Antillean manatees (Trichechus manatus) in Brazil. Biota Neotrop. Sep/Dez 2007 vol. 7, no. 3 http://www. biotaneotropica.org.br/v7n3/pt/abstract?article+bn03607032007. ISSN 1676-0603. The increasing traffic of motorboats on feeding, resting and reproduction areas used by manatees causing serious problems for these animals, so scaring them away and leading to potential collisions. The purpose of this study was to describe cases interaction between boat and Antillean manatees (Trichechus manatus) living in the Northeastern coast of Brazil. These interactions took place in the State of Ceara, Paraiba and Sergipe, involving three specimens, one of them with four records. Clinical alterations were observed, such as edema in the frontal part of the body, ocular proptosis, weight loss and multiple cuts all over the body. Therefore, the increasing traffic of motorboats, allied to the lack of normative rules and effective law enforcement assuring the protection of specific areas, represent a direct risk to the conservation of Antillean manatees living in the Northeastern coast of Brazil.

Accumulation, effects on growth, and localization of zinc in Padina gymnospora (Dictyotales, Phaeophyceae) *

Abstract: The ability of young plants of the brown alga Padina gymnospora to tolerate and accumulate zinc was determined for different zinc concentrations in seawater over a period of 21 days. This species, among 10 macroalgae species studied in a contaminated coastal area near Rio de Janeiro city, presented the highest zinc contents. The accumulation of zinc by this species determined from in vitro experiments increased approximately linearly with the zinc concentration in the water. A steady state was not reached even for high concentrations (1000 µg 1-1). Analytical electron microscopy techniques used for subcellular localization of this metal showed that the zinc was present as dense granules along the cell walls, starting in a region 15 to 25 cells away from the thallus apex, but being absent in the cytoplasm of viable cells. It is suggested that the cell walls play the main role in the zinc accumulation in Padina gymnospora.

Cleaning Symbiosis Between Hawksbill Turtles and Reef Fishes at Fernando de Noronha Archipelago, off Northeast Brazil

Abstract: Hawksbill turtles (Eretmochelys imbricata) are cleaned and followed by reef fishes at Fernando de Noronha Archipelago, off northeast Brazil. During foraging, turtles are cleaned by damselfishes (Abudefduf saxatilis and Stegastes rocasensis), and followed by juvenile wrasses (Thalassoma noronhanum and Halichoeres radiatus).

Percepção ambiental e uso do solo por agricultores de sistemas orgânicos e convencionais na Chapada da Ibiapaba, Ceará

Abstract: O crescimento do mercado de alimentos livres de agrotoxicos vem gerando interesse de agricultores em sistemas orgânicos de producao. Os adeptos deste sistema promovem mudancas substanciais de seus metodos de producao, adquirindo conhecimentos tecnicos e empiricos associados. Sao necessarios, portanto, estudos para avaliar o sistema orgânico neste contexto, comparando-o com o modo de producao convencional, no que diz respeito aos aspectos socioeconomicos e ambientais. Este estudo teve como objetivo o diagnostico regional desses aspectos em sistemas orgânicos e convencionais do distrito de Sussuanha, municipio de Guaraciaba do Norte, e do municipio de Sao Benedito, no estado do Ceara. Foram entrevistados sete agricultores orgânicos e 21 agricultores convencionais, caracterizando o meio social e as mudancas de qualidade de vida ocorridas com o tempo. As interacoes agricultor-meio ambiente, no sistema de producao orgânico, geraram melhoria da qualidade de vida das familias. No sistema convencional, caracterizado pelo uso intensivo de agrotoxicos e grande dependencia de adubos quimicos, constatou-se que prevalece o interesse em obter a maxima producao sem preocupacao com o ambiente. Esta condicao se reflete no contato continuo com agrotoxicos, alem das margens de lucros restritivas, o que pode comprometer o uso do solo pelas futuras geracoes, pois ha uma inerente reducao da fertilidade natural dos solos cultivados sob este sistema.

Dinâmica populacional do Surubim-tigre, Pseudoplatystoma Tigrinum (Valenciennes, 1840) no médio Amazonas (Siluriformes, Pimelodidae)

Abstract: Dados de comprimento e de captura e esforco da pesca do surubim-tigre (Pseudoplatystoma tigrinum) obtidos durante o periodo de 1993 a 1996, no Medio Amazonas, foram utilizados para descrever as pescarias e estimar as taxas de crescimento e mortalidade da especie. Os parâmetros populacionais medios estimados foram Loo =180,0 cm (comprimento total), Woo = 56,56 kg, k = 0,29 ano-1, C = 0,9; WP = Novembro, M = 0,47 ano-1, Z = l ,42 ano-1, F = 0,95 ano-1 e Lc = 87,0 cm. A analise do rendimento por recruta mostra que o estoque esta sendo explorado em seu limite de sustentabilidade.