Endocrine disrupting effects on the nesting behaviour of male three-spined stickleback Gasterosteus aculeatus L

The analysis of patterns of temporal variability in the nesting behaviour of male threespined stickleback (Gasterosteus aculeatus) exposed to the synthetic oestrogen, 17β-ethinylestradiol, revealed immediate, but transient, treatment-related effects. Gluing frequency and time spent near nest were significantly reduced in exposed fish at the beginning of the experiment. The expression of these behaviours subsequently recovered and there was no effect of treatment on nest building success. The potential causes and implications of these findings are discussed

Aquaculture diversification in South America: general views and facts and case studies of the Republic of Chile and the Federative Republic of Brazil.

Aquaculture and aquaculture diversification in South America: Facts and figures. Diversification of aquaculture in South America: a few figures and concepts. Aquaculture and aquaculture diversification in the Republic of Chile: Current situation, production models and strategies. The aquaculture diversification process in the Republic of Chile: recent history and current status. Diversification and the role of government and private industry. Technology and expertise, markets, institutional facilities and governance as drivers and/or constraints to aquaculture diversification in the Republic of Chile. The future of aquaculture diversification in the Republic of Chile. Aquaculture and aquaculture diversification in the Federative Republic of Brazil: Current situation and main species farmed. Recent history and current status of aquaculture diversification: Main drivers, constraints and species. The role of government, private industry and international organizations in aquaculture diversification. Technology and expertise, markets and institutional facilities as drivers and constraints. The future of aquaculture diversification: Main concerns, opportunities, restrictions, main species to consider.bitstream/item/164749/1/CNPASA-2017-fao.pd

Os avanços da aqüicultura.

A produção global da aqüicultura tem apresentado elevados níveis de crescimento nas últimas duas décadas, e no Brasil, esta expansão está expressa no aumento do consumo per capita de pescados, de 6 para 8kg/ano. Este aumento na produção tem gerado excedentes exportáveis que tornaram a balança comercial brasileira superavitária desde 2001 (MDIC/SECEX)

G55.0+0.3: A Highly Evolved Supernova Remnant

Multi-frequency analysis has revealed the presence of a new supernova remnant, G55.0+0.3, in the Galactic plane. A kinematic distance of 14 kpc has been measured from HI spectral line data. The faint, clumpy half-shell is non-thermal and has a physical radius of 70 pc. Using an evolutionary model, the age of the remnant is estimated to be on the order of one million years, which exceeds conventional limits by a factor of five. The remnant may be associated with the nearby pulsar J1932+2020, which has a spin-down age of 1.1 million years. This work implies that the radiative lifetimes of remnants could be much longer than previously suggested.Comment: 27 pages, 7 figures in 9 files (figures 1 and 2 require 2 files each), Accepted for publication in The Astrophysical Journal (Jan. 20, 1998 volume

Automatic Detection of Expanding HI Shells Using Artificial Neural Networks

The identification of expanding HI shells is difficult because of their variable morphological characteristics. The detection of HI bubbles on a global scale therefore never has been attempted. In this paper, an automatic detector for expanding HI shells is presented. The detection is based on the more stable dynamical characteristics of expanding shells and is performed in two stages. The first one is the recognition of the dynamical signature of an expanding bubble in the velocity spectra, based on the classification of an artificial neural network. The pixels associated with these recognized spectra are identified on each velocity channel. The second stage consists in looking for concentrations of those pixels that were firstly pointed out, and to decide if they are potential detections by morphological and 21-cm emission variation considerations. Two test bubbles are correctly detected and a potentially new case of shell that is visually very convincing is discovered. About 0.6% of the surveyed pixels are identified as part of a bubble. These may be false detections, but still constitute regions of space with high probability of finding an expanding shell. The subsequent search field is thus significantly reduced. We intend to conduct in the near future a large scale HI shells detection over the Perseus Arm using our detector.Comment: 39 pages, 11 figures, accepted by PAS

Radio polarimetric imaging of the interstellar medium: magnetic field and diffuse ionized gas structure near the W3/W4/W5/HB3 complex

We have used polarimetric imaging to study the magneto-ionic medium of the Galaxy, obtaining 1420 MHz images with an angular resolution of 1' over more than 40 square-degrees of sky around the W3/W4/W5/HB3 HII region/SNR complex in the Perseus Arm. Features detected in polarization angle are imposed on the linearly polarized Galactic synchrotron background emission by Faraday rotation arising in foreground ionized gas having an emission measure as low as 1 cm^{-6} pc. Several new remarkable phenomena have been identified, including: mottled polarization arising from random fluctuations in a magneto-ionic screen that we identify with a medium in the Perseus Arm, probably in the vicinity of the HII regions themselves; depolarization arising from very high rotation measures (several times 10^3 rad m^{-2}) and rotation measure gradients due to the dense, turbulent environs of the HII regions; highly ordered features spanning up to several degrees; and an extended influence of the HII regions beyond the boundaries defined by earlier observations. In particular, the effects of an extended, low-density ionized halo around the HII region W4 are evident, probably an example of the extended HII envelopes postulated as the origin of weak recombination-line emission detected from the Galactic ridge. Our polarization observations can be understood if the uniform magnetic field component in this envelope scales with the square-root of electron density and is 20 microG at the edge of the depolarized region around W4, although this is probably an over-estimate since the random field component will have a significant effect.Comment: 18 pages, 8 figures (7 jpeg and 1 postscript), accepted for publication in the Astrophysical Journa

Sistema de inteligência territorial estratégica para aquicultura.

A criação do Sistema de Inteligência Territorial Estratégica para Aquicultura no Brasil (SITE Aquicultura), adotando ferramentas e conceitos de análise espacial e propondo indicadores socioeconômicos, atende à necessidade premente de monitoramento dessa cadeia produtiva. Além disso, pode fornecer subsídios técnicos para o entendimento da configuração geográfica da atividade aquícola. Sob coordenação da Embrapa Pesca e Aquicultura, conta com diversos parceiros e três diferentes financiadores. Um deles é o Projeto Integrado da Amazônia, série de projetos que a Embrapa lidera dentro do Fundo Amazônia, que conta com recursos internacionais doados por alguns países e operacionalizados pelo Banco Nacional de Desenvolvimento Econômico e Social (BNDES), em cooperação com o Ministério do Meio Ambiente. O objetivo principal do SITE Aquicultura é mapear, validar, analisar e disponibilizar dados e informações geográficas sobre a aquicultura, dispostos em Sistemas de Informações Geográficas (SIGs). Os SIGs podem auxiliar na definição, de forma rápida, acertada e oportuna, da tomada de decisão de agentes públicos e privados das cadeias produtivas relacionadas à aquicultura, bem como identificar possíveis necessidades de realinhamento diante dos novos rumos do mercado e de políticas públicas.bitstream/item/219697/1/SITE-aquicultura-01.pd

Relatório técnico do Seminário Nacional de Prospecção de Demandas da Cadeia Produtiva da Pesca: PROSPESQUE.

Resumo. Abstract. Objetivos. Metodologia. Portfólios de projetos e escala de impactos. Apresentação dos portfólios de projetos e encerramento.bitstream/item/122526/1/CNPASA-2012.pd

On the lease rate, convenience yield and speculative effects in the gold futures market

By examining data on the gold forward offered rate (GOFO) and lease rates over the period 1996- 2009, we conclude that the convenience yield of gold is better approximated by the lease rate than the interest-adjusted spread of Fama & French (1983). Using the latter quantity, we study the relationship between gold leasing and the level of COMEX discretionary inventory and exhibit that lease rates are negatively related to inventories. We also show that Futures prices have increasingly exceeded forward prices over the period, and this effect increases with the speculative pressure and the maturity of the contracts