64 research outputs found
The organisation of fish assemblages in the regulated Lima basin, Northern Portugal
In order to understand the structure of fish assemblages in the modified Lima basin (Northern
Portugal), two distinct datasets concerning the presence and abundance of fish species
were subjected to multivariate analysis. On the River Lima two types of flow modification
are present within kilometres of one another: (a) a reduced and constant flow due to hypolimnetic
release; and (b) an intense and irregular flow. A comparison of their influence on fish
assemblages revealed a gradient of assemblage types from tributaries to main river sites. The
latter were characterised by a strong dominance of cyprinids, particularly Iberian barbel
(Barbus bocagei). The former harboured two kinds of fish assemblages: those closer to the
river mouth were dominated by the cyprinids Iberian chub (Squalius carolitertii) and Iberian
nase (Chondrostoma polylepis), which were also frequently present in the main river; while
in those further upstream the predominant species was the brown trout (Salmo trutta). Although
explanatory variables such as distance from source, altitude, substrate coarseness and
width were the primary correlates of fish assemblage composition, dam construction and
flow regulation also had a significant effect upon assemblage structure, particularly by: i) reducing
the importance of migratory species; ii) constraining the presence of trout in the regulated
segments; and iii) simplifying the community, especially in the case of the constant and
reduced flow regimeinfo:eu-repo/semantics/publishedVersio
Dual embedding of the Lorentz-violating electrodinamics and Batalin-Vilkovisky quantization
Modifications of the electromagnetic Maxwell Lagrangian in four dimensions
have been considered by some authors. One may include an explicit massive term
(Proca) and a topological but not Lorentz-invariant term within certain
observational limits.
We find the dual-corresponding gauge invariant version of this theory by
using the recently suggested gauge embedding method. We enforce this
dualisation procedure by showing that, in many cases, this is actually a
constructive method to find a sort of parent action, which manifestly
establishes duality. We also use the gauge invariant version of this theory to
formulate a Batalin-Vilkovisky quantization and present a detailed discussion
on the excitation spectrum.Comment: 8 page
Use of SMS texts for facilitating access to online alcohol interventions: a feasibility study
A41 Use of SMS texts for facilitating access to online alcohol interventions: a feasibility study
In: Addiction Science & Clinical Practice 2017, 12(Suppl 1): A4
Anemia prevalence in women of reproductive age in low- and middle-income countries between 2000 and 2018
Anemia is a globally widespread condition in women and is associated with reduced economic productivity and increased mortality worldwide. Here we map annual 2000–2018 geospatial estimates of anemia prevalence in women of reproductive age (15–49 years) across 82 low- and middle-income countries (LMICs), stratify anemia by severity and aggregate results to policy-relevant administrative and national levels. Additionally, we provide subnational disparity analyses to provide a comprehensive overview of anemia prevalence inequalities within these countries and predict progress toward the World Health Organization’s Global Nutrition Target (WHO GNT) to reduce anemia by half by 2030. Our results demonstrate widespread moderate improvements in overall anemia prevalence but identify only three LMICs with a high probability of achieving the WHO GNT by 2030 at a national scale, and no LMIC is expected to achieve the target in all their subnational administrative units. Our maps show where large within-country disparities occur, as well as areas likely to fall short of the WHO GNT, offering precision public health tools so that adequate resource allocation and subsequent interventions can be targeted to the most vulnerable populations.Peer reviewe
O desenvolvimento embrionário da Piapara, Leporinus elongatus (Pisces, Anostomidae), utilizando técnicas de histologia, microscopia eletrônica de varredura e imunológicas empregando marcadores ósseos
Geomorphometric tool associated with soil types and properties spatial variability at watersheds under tropical conditions
Behavioral changes induced by cocaine in mice are modified by a hyperlipidic diet or recombinant leptin
Anemia prevalence in women of reproductive age in low- and middle-income countries between 2000 and 2018
Impact assessment of the introduction of Cichla kelberi in a large Neotropical reservoir and its lateral lagoons (Upper Paraná River Basin, Brazil)
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