ORCID Profile
0000-0002-2329-5601
Current Organisations
Charles Sturt University
,
ETH Zurich
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Publisher: Springer Science and Business Media LLC
Date: 29-05-2020
Publisher: Wiley
Date: 19-05-2023
Abstract: Drift or downstream dispersal is a fundamental process in the life cycle of many riverine organisms. In the face of rapidly declining freshwater bio ersity, there is a need to enhance our capacity to study the drift of riverine organisms, by overcoming the limitations of traditional labour‐intensive s ling methods that result in data of low temporal and spatial resolution. To address this need, we developed a new technology, the Riverine Organism Drift Imager (RODI), which combines in situ imaging with machine‐learning classification. This technique expands on the traditional methodology by replacing the collection cup of a drift net with a camera system that continuously images riverine organisms as they drift through the device. After being imaged, organisms are released into the environment unharmed. A machine‐learning classifier is used after field s ling to identify drifting organisms. Therefore, RODI provides a non‐invasive s ling method that can quantify organism drift at unprecedented temporal resolution. Multiple deployments have served to validate the performance of the technology in the field. In its current implementation, images are captured continuously for 1.5 h at 50 frames per second. We demonstrate that the quality of the resulting images enables a convolutional neural network classifier to identify organisms to the family level. The weighted F1 score, a metric for the performance of the classifier, was 94%, based on training and testing on a field‐collected dataset consisting of 4598 images of 285 organisms belonging to seven classes (one species, five families and one order). In conclusion, this work provides a proof of concept, demonstrating the viability of the deployment of RODI as an automated, in situ organism drift s ler. This novel approach offers the possibility to advance our fundamental understanding of the drift of riverine organisms and how this is affected by human impacts in natural streams while, at the same time, can serve as a cost‐effective tool for bio ersity monitoring.
Publisher: Wiley
Date: 13-08-2020
DOI: 10.1111/GCB.15282
Publisher: Wiley
Date: 08-10-2014
DOI: 10.1111/JPC.12752
Abstract: This annotation discusses definitions of 'sleep problems', the impacts of infant sleep on maternal and paternal well-being, and the evidence behind two areas of current controversy - the role of attachment versus behaviourally based parenting in infant sleep and management strategies for sleep problems in infants aged less than 6 months.
Publisher: Royal College of Psychiatrists
Date: 02-2015
DOI: 10.1192/BJP.BP.114.149138
Abstract: In low- and middle-income countries little is known about changes in women's mental health status from the perinatal period to 15 months postpartum or the factors associated with different trajectories. To determine the incidence and rates of recovery from common mental disorders (CMD) among rural Vietnamese women and the risk and protective factors associated with these outcomes from the perinatal period to 15 months after giving birth. In a population-based prospective study, a systematically recruited cohort of women completed baseline assessments in either the last trimester of pregnancy or 4–6 weeks after giving birth and were followed up 15 months later. The common mental disorders of major depression, generalised anxiety and panic disorder were assessed by psychiatrist-administered Structured Clinical Interview for DSM-IV Disorders at both baseline and follow-up. A total of 211 women provided complete data in this study. The incidence rate of CMD in the first postpartum year was 13% (95% CI 8–19), and 70% (95% CI 59–80) of women who had perinatal CMD recovered within the first postpartum year. Incidence was associated with having experienced childhood maltreatment, experiencing the intimate partner as providing little care, sensitivity, kindness or affection, and the chronic stress of household poverty. Recovery was associated with higher quality of a woman's relationships with her intimate partner and her own mother, longer period of mandated rest following birth, and sharing of domestic tasks and infant care. Modifiable social factors, in particular the quality of a woman's closest relationships with her partner and her own mother, and participation by family members in domestic work and infant care, are closely related to women's mental health in the first year after giving birth in resource-constrained settings.
Publisher: Wiley
Date: 09-08-2018
DOI: 10.1002/RRA.3320
Publisher: Wiley
Date: 29-09-2016
DOI: 10.1002/RRA.3105
Publisher: CSIRO Publishing
Date: 2018
DOI: 10.1071/MFV69N12_ED
Publisher: Wiley
Date: 26-08-2011
DOI: 10.1002/RRA.1567
Publisher: FapUNIFESP (SciELO)
Date: 2007
DOI: 10.1590/S1679-62252007000200003
Abstract: A preliminary study on the application of radio-telemetry techniques to describe the movements of fish in a bypass channel at Itaipu Dam (Paraná River), known as "Canal da Piracema," was carried out between January and February of 2004. Fourteen in iduals of six species (Prochilodus lineatus, Leporinus friderici, Schizodon borellii, Pseudoplatystoma fasciatum, Pterodoras granulosus and Cichla kelberi) were intragastrically and surgically radiotagged and monitored by three experimental fixed radio-telemetry stations installed in the upper portion of the Canal. The surgical implantation of transmitters and the anesthesia using clove oil proved to be more efficient and allowed easier handling in comparison to intragastric implantation and electronarcosis immobilization. The use of fixed stations to obtain data was found to be very suitable for tracking movements of several different fish species in the Itaipu lateral channel. Three species (P. granulosus, S. borellii and C. kelberi) moved downstream after release. Two in iduals of P. fasciatum and two of P. lineatus migrated upstream, leaving the channel 7 and 10 days and 2 and 24 days after release, respectively. Leporinus friderici was the only species that did not leave the release site until the end of the study period.
Publisher: American Society of Civil Engineers (ASCE)
Date: 07-2018
Publisher: FapUNIFESP (SciELO)
Date: 10-2012
DOI: 10.1590/S1679-62252012000400008
Abstract: Fish passages are considered the oldest management tool used to minimize the impact of blocking fish migratory routes by hydroelectric power plants. However, fish passages are being installed without specific criteria in Brazil, with severe consequences to the conservation of the local fish fauna. Therefore, basic data gathered for fish passages already constructed could contribute to define operational rules, in addition to offer subsidies to decision-making and design of future facilities. Thus, the fish ladder of Baguari Dam was evaluated regarding temporal distribution, attraction, and ascension of the local fish fauna. A total of 20 fish s les were conducted immediately downstream of the dam and inside the fish ladder, from January 2010 to June 2011. Seasonal variation in fish abundance and richness was registered below the dam and inside the passage, with higher number of migratory fish in the reproductive season (Kruskall-Wallis, p = 0.04 and p = 0.05). Furthermore, higher concentration of migratory allochthonous and non-migratory species was registered for the spill bay (Wilcoxon, p = 0.009 and p = 0.006) compared to the tailrace, where the fish ladder entrance is located. This result suggests low efficiency of the attraction system of the mechanism during the reproductive period. Once entering the fish ladder, migratory species apparently ascend the facility due to the similar distribution throughout different stretches. Generally, the results showed that an operational rule for the Baguari Dam fish ladder should consider running the facility only during the reproductive period, unless the objectives of the passage are well defined. The attraction system must be more precisely evaluated, using technologies such as radiotelemetry. Similarly, fish ascension also should be better analyzed to evaluate the time spent to ascend and its influence in the reproductive biology of the species using the ladder. Pit-tag system could be used to approach this analysis. It is expected that the discussion of these results would be useful for companies of the energy sector and for environmental agencies in Brazil, subsidizing decisions related to the management of fish passages already installed and to the construction of new facilities in the country.
Publisher: Springer Science and Business Media LLC
Date: 24-11-2015
Publisher: FapUNIFESP (SciELO)
Date: 09-2002
Publisher: Wiley
Date: 30-08-2021
DOI: 10.1002/ECE3.8026
Abstract: Wildfires in many western North American forests are becoming more frequent, larger, and severe, with changed seasonal patterns. In response, coniferous forest ecosystems will transition toward dominance by fire‐adapted hardwoods, shrubs, meadows, and grasslands, which may benefit some faunal communities, but not others. We describe factors that limit and promote faunal resilience to shifting wildfire regimes for terrestrial and aquatic ecosystems. We highlight the potential value of interspersed nonforest patches to terrestrial wildlife. Similarly, we review watershed thresholds and factors that control the resilience of aquatic ecosystems to wildfire, mediated by thermal changes and chemical, debris, and sediment loadings. We present a 2‐dimensional life history framework to describe temporal and spatial life history traits that species use to resist wildfire effects or to recover after wildfire disturbance at a metapopulation scale. The role of fire refuge is explored for metapopulations of species. In aquatic systems, recovery of assemblages postfire may be faster for smaller fires where unburned tributary basins or instream structures provide refuge from debris and sediment flows. We envision that more‐frequent, lower‐severity fires will favor opportunistic species and that less‐frequent high‐severity fires will favor better competitors. Along the spatial dimension, we hypothesize that fire regimes that are predictable and generate burned patches in close proximity to refuge will favor species that move to refuges and later recolonize, whereas fire regimes that tend to generate less‐severely burned patches may favor species that shelter in place. Looking beyond the trees to forest fauna, we consider mitigation options to enhance resilience and buy time for species facing a no‐analog future.
Publisher: FapUNIFESP (SciELO)
Date: 06-2006
DOI: 10.1590/S1679-62252006000200017
Abstract: On site human observations and video images were collected and compared at the window of the Igarapava Dam fish ladder (IDFL), rio Grande , Southeastern Brazil, between March 1st and June 30th, 2004. We conducted four experiments with two humans (Observer 1 and Observer 2) observing fish passage in the IDFL window while a Sony 3CCD video camera (Observer 3) recorded fish passage at the same time. Experiments, each one hour in length, were distributed throughout the diel cycle using full spectrum lights. We identified fish species, the number of in iduals for each species, and the real time that they passed. Counts from each human observer were compared to the video counts. The fish species most commonly observed in the window were - curimba (Prochilodus lineatus), mandi-amarelo (Pimelodus maculatus), piau-três-pintas (Leporinus friderici) and ferreirinha (Leporinus octofasciatus). The number of species and in iduals were indistinguishable for the three observers. But, the number of species and in iduals were significantly different among experiments. Thus, the three observers register the same number of species and count the same number of in iduals even when these two response variables differ significantly among experiments. Based on these results, we concluded that the video count was an accurate method to assess fish passage at the IDFL.
Publisher: Springer Science and Business Media LLC
Date: 04-03-2023
Publisher: Wiley
Date: 08-2016
Publisher: Wiley
Date: 03-2014
Publisher: Wiley
Date: 12-08-2021
DOI: 10.1111/REC.13496
Abstract: In the recently declared United Nations Decade on Ecosystem Restoration (2021–2030), evidence‐based research has an essential role in summarizing restoration outcomes toward broad generalizations to advance restoration practice and science globally. However, to present trustworthy, high‐quality recommendations, evidence reviews should be based on rigorous methods that minimize bias and enhance systematicity, transparency, objectivity, comprehensiveness, and repeatability. To assess the current value of restoration reviews in terms of methodological repeatability at the searching stage, a fundamental review stage, we evaluated a s le of meta‐analyses and narrative syntheses ( n = 79) and critically appraised how searches were conducted based on the information reported within each study. By assessing whether review methods were reported in sufficient detail to be repeated by an independent party, we found that repeatability varied substantially by the standard we used. Overall, reviews performed relatively poorly, with a median score of 3 out of 9 points available, and a mean score of 3.6. Most reviews ( n = 76/79) failed in effectively reporting all necessary information to allow repeatability at this stage. We found no statistically significant differences considering review types, suggesting that the type of synthesis alone does not solely reflect the repeatability of a review. Toward increasingly repeatable, reliable reviews in restoration ecology, we recommend that authors incorporate and apply principles of systematic reviews and maps in their review process, and suggest that environmental journals should broadly emphasize ways of performing rigorous reviews, as well as increase efforts for the publication of open access review protocols.
Publisher: CSIRO Publishing
Date: 2018
DOI: 10.1071/MF18142
Abstract: Hydropower development poses severe threats to the aquatic ersity and ecosystem services. One such threat is the exposure of fish to extreme conditions within hydropower facilities. Fish may suffer rapid decompression when passing through turbines or when entering the draft tubes, which can lead to barotrauma and mortality. We aimed to evaluate the effects of rapid decompression on the Amazonian benthic species Pimelodus pictus (Pictus catfish), by simulating in hypo–hyperbaric chambers. The most frequent injuries in Pictus catfish exposed to simulated rapid decompression were swim-bladder rupture, intestine rupture, internal haemorrhage and embolism. The occurrence and magnitude of internal haemorrhaging and emboli were related to the ratio of pressure change and the decompression timespan, whereas swim-bladder rupture occurred even at relatively low ratios. Emboli was present almost entirely among fish with a ruptured swim bladder. Importantly, all fish were negatively buoyant before exposure to decompression, posing challenges to data analysis. Therefore, barotrauma studies with benthic fish species are deemed to be challenging and are likely to require the use of complementary approaches. Research is needed to understand the state of buoyancy of benthic fish in the wild and to develop methods to accurately replicate these in a controlled testing environment.
Publisher: CSIRO Publishing
Date: 2019
DOI: 10.1071/MF19176
Abstract: Irrigated agriculture and inland fisheries both make important contributions to food security, nutrition, livelihoods and wellbeing. Typically, in modern irrigation systems, these components operate independently. Some practices, commonly associated with water use and intensification of crop production can be in direct conflict with and have adverse effects on fisheries. Food security objectives may be compromised if fish are not considered in the design phases of irrigation systems. The 2030 Agenda for Sustainable Development provides a framework that can serve as a backdrop to help integrate both sectors in policy discussions and optimise their contributions to achieving the Sustainable Development Goals (SDGs). Inland fisheries systems do play an important role in supporting many SDG objectives, but these contributions can sometimes be at odds with irrigated agriculture. Using case studies of two globally important river catchments, namely the Lower Mekong and Murray–Darling basins, we highlight the conflicts and opportunities for improved outcomes between irrigated agriculture and inland fisheries. We explore SDG 2 (Zero Hunger) as a path to advance our irrigation systems as a means to benefit both agriculture and inland fisheries, preserving bio ersity and enhancing the economic, environmental and social benefits they both provide to people.2
Publisher: Informa UK Limited
Date: 03-02-2022
Publisher: Springer Science and Business Media LLC
Date: 10-10-2020
Publisher: CSIRO Publishing
Date: 2018
DOI: 10.1071/MF18267
Abstract: Barotrauma as a result of rapid decompression has been recorded as the most common injury among fish captured in the tailrace of hydropower dams in Brazil, with catfishes representing the majority of them. Nevertheless, studies investigating barotrauma on catfish are scarce, with the majority determining dose–response curves and thresholds of pressure changes for nektonic species, such as salmonids. Experiments conducted with Pimelodus pictus showed that the current hypo-hyperbaric chambers used to study barotrauma in nektonic species can have limitations when applied to benthic groups. The negative buoyancy showed by the catfish prevented the definition of the acclimation pressure of the fish before exposure to decompression and, therefore, the method had to be adapted to allow the calculation of the ratio of pressure change (RPC). The adaptation involved anaesthetising the fish, which added a potential bias to the experiments. Therefore, new approaches deemed to be needed to complement barotrauma studies with benthic fish. We aimed to discuss the limitations observed for studies with benthic species and present potential methods to overcome them. The ersification of approaches for barotrauma studies with benthic species is critical to provide information for the development of mitigation and new turbine designs that would improve protection of this group.
Publisher: Canadian Science Publishing
Date: 19-06-2023
DOI: 10.1139/ER-2022-0116
Abstract: Freshwater bio ersity loss is accelerating globally, but humanity can change this trajectory through actions that enable recovery. To be successful, these actions require coordination and planning at a global scale. The Emergency Recovery Plan for global freshwater bio ersity aims to reduce the risk for freshwater bio ersity loss through six priority actions: (1) accelerate implementation of environmental flows (2) improve water quality to sustain aquatic life (3) protect and restore critical habitats (4) manage exploitation of freshwater species and riverine aggregates (5) prevent and control nonnative species invasions in freshwater habitats and (6) safeguard and restore freshwater connectivity. These actions can be implemented using future-proofing approaches that anticipate future risks (e.g., emerging pollutants, new invaders, and synergistic effects) and minimize likely stressors to make conservation of freshwater bio ersity more resilient to climate change and other global environmental challenges. While uncertainty with respect to past observations is not a new concern for freshwater bio ersity, future-proofing has the distinction of accounting for the uncertainty of future conditions that have no historical baseline. The level of uncertainty with respect to future conditions is unprecedented. Future-proofing of the Emergency Recovery Plan for freshwater bio ersity will require anticipating future changes and developing and implementing actions to address those future changes. Here, we showcase future-proofing approaches likely to be successful using local case studies and ex les. Ensuring that response options within the Emergency Recovery Plan are future-proofed will provide decision makers with science-informed choices, even in the face of uncertain and potentially new future conditions. We are at an inflection point for global freshwater bio ersity loss learning from defeats and successes can support improved actions toward a sustainable future.
Publisher: Elsevier BV
Date: 04-2018
Publisher: Elsevier BV
Date: 2018
Publisher: Routledge
Date: 02-01-2018
Publisher: FapUNIFESP (SciELO)
Date: 2007
DOI: 10.1590/S1679-62252007000200018
Abstract: Jaú, Zungaro jahu (Ihering, 1898), a large migratory catfish endemic to the rio da Prata basin, has a fragile conservation status and its ecology is poorly known. We radio-tracked a female jaú with a total length of 1.5 m that was passed upstream of Funil Dam, rio Grande, to describe its migratory movements, habitat use, linear home range, and diel activity. To track the fish, we made five tracking trips in the period from April, 2003 to January, 2004. In addition to the main body of Funil Reservoir, the fish also used a reservoir-river transition zone located in a branch of Funil Reservoir that flooded part of rio das Mortes. Most of the times, we found the fish in the former beds of streams flooded by the reservoir, at depths that ranged from 8-9 m in the reservoir-river transition zone to 18-21 m in Funil Reservoir. Linear home range of the fish was 31.4 km. The onset of activity occurred early in the evening, but we also detected daytime activity. The conclusion from our study was that the passed adult female jaú used reservoir habitats, migrated between the main body and the reservoir-river transition zone, preferred deep habitats, showed a relatively short home range, and had diurnal and nocturnal activities.
No related grants have been discovered for Luiz G. M. Silva.