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85 results for “lake assessment”
Data from: Performance assessment of two whole-lake acoustic positional telemetry systems - is reality mining of free-ranging aquatic animals technologically possible?
Acoustic positional telemetry systems (APTs) represent a novel approach to study the behaviour of free ranging aquatic animals in the wild at unprecedented detail. System manufactures promise remarkably high temporal and spatial resolution. However, the performance of APTs has rarely been rigorously tested at the level of entire ecosystems. Moreover, the effect of habitat structure on system performance has only been poorly documented. Two APTs were deployed to cover two small lakes and a series of standardized stationary tests were conducted to assess system performance. Furthermore, a number of tow tests were conducted to simulate moving fish. Based on these data, we quantified system performance in terms of data yield, accuracy and precision as a function of structural complexity in relation to vegetation. Mean data yield of the two systems was 40 % (Lake1) and 60 % (Lake2). Average system accuracy (acc) and precision (prec) were Lake1: acc = 3.1 m, prec = 1.1 m; Lake2: acc = 1.0 m, prec = 0.2 m. System performance was negatively affected by structural complexity, i.e., open water habitats yielded far better performance than structurally complex vegetated habitats. Post-processing greatly improved data quality, and sub-meter accuracy and precision were, on average, regularly achieved in Lake2 but remained the exception in the larger and structurally more complex Lake1. Moving transmitters were tracked well by both systems. Whereas overestimation of moved distance is inevitable for stationary transmitters due to accumulation of small tracking errors, moving transmitters can result in both over- and underestimation of distances depending on circumstances. Both deployed APTs were capable of providing high resolution positional data at the scale of entire lakes and are suitable systems to mine the reality of free ranging fish in their natural environment. This opens important opportunities to advance several fields of study such as movement ecology and animal social networks in the wild. It is recommended that thorough performance tests are conducted in any study utilizing APTs. The APTs tested here appear best suited for studies in structurally simple ecosystems or for studying pelagic species. In such situations, the data quality provided by the APTs is exceptionally high.
Data from: Performance assessment of two whole-lake acoustic positional telemetry systems - is reality mining of free-ranging aquatic animals technologically possible?
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Assessment of radioactivity levels and associated radiological hazards index in lake water from eastern areas of Lake Hawassa, Sidama region, Ethiopia
<p><strong><span>Abstract</span></strong></p> <p><span>Water samples from the Sidama Region of Ethiopia's Lake Hawassa have been measured for naturally occurring radioactivity. The radioisotopes of <sup>238</sup>U (<sup>214</sup>Pb, <sup>214</sup>Bi), <sup>232</sup>Th (<sup>228</sup>Ac), and <sup>40</sup>K were assessed on water samples through the use of gamma-ray spectrometry (a high-purity germanium detector). The activity concentrations (in Bq </span><span></span><span>(Bq</span><span></span><span>)) of these isotopes ranged from BDL to 4.17 ± 0.82, BDL to 9.13 ± 1.06 , and BDL to 92.10 <span> </span>± 4.50, with average values of 2.35 ± 0.58, 6.05 ± 0.58 , and 55.13 ± 2.80 , respectively.</span><span> </span><span>In addition, the average values of the radiological hazard indices: external hazard index (</span><span></span><span>= 0.04), absorbed dose rate (</span><span></span><span><span> </span>= 7.14 nGy</span><span></span><span>), and annual effective dose equivalent (</span><span></span><span><span> </span>= 0.009 mSv</span><span></span><span>) were assessed and compared to different countries and an international standard. According to literature from different countries, these findings of all activity concentrations and radiological hazard indices (the external hazard index, absorbed dose rate, and annual effective dose equivalent) fall within that range. It also appears to be baseline data that will facilitate ongoing assessments and comparisons of radiological safety in various environments. By establishing a reference point, it can help identify changes or trends over time, guiding future environmental policies and initiatives.</span></p>
Assessing the Potential Ecological Impacts of Perfluorinated Chemicals (PFCs) in the liver and testis of male largemouth bass (Micropterus salmoides) in Minnesota Lakes
GEO Series GSE57684. Micropterus salmoides. 72 samples. Type: Expression profiling by array.
Dataset - Dissolved organic matter sources and processing in the endorheic Lake Nam Co catchment (Tibet) as assessed by ultra-high resolution Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS)
<p> </p> <p>Disclaimer 2022-01-04: Associated full text in preparation</p>
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International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.