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35 results for “freshwater sources”
FIGURE 12 in Description of two new species, Aphanolaimus strilliae n. sp. (Nematoda: Aphanolaimidae) and Makatinus africanus n. sp. (Nematoda: Aporcelaimidae), and SEM observations on three known species from freshwater sources in the Telperion Nature Reserve (Mpumalanga, South Africa)
FIGURE 12. Scanning electron micrograph of Eutobrilus annetteae (Joubert & Heyns, 1979) Tsalolikhin, 1983; A) Anterior end showing long cephalic setae (lcs), short cephalic setae (scs) and labial papillae (lp) and liplets (l); B) Ventral side of body showing vulva (arrow); C) Tail region showing spinneret (arrow).
FIGURE 17 in Description of two new species, Aphanolaimus strilliae n. sp. (Nematoda: Aphanolaimidae) and Makatinus africanus n. sp. (Nematoda: Aporcelaimidae), and SEM observations on three known species from freshwater sources in the Telperion Nature Reserve (Mpumalanga, South Africa)
FIGURE 17. Scanning electron micrograph of Neotobrilus ampiei (Joubert & Heyns, 1979) Tsalolikhin, 1981 A) Female tale showing spinneret and last somatic (caudal setae); B–C) Close up of tip of spicule (s) showing medial outgrowth; D) Male posterior part showing supplements S1–S6 and a row of ventrosublateral setae.
FIGURE 11 in Description of two new species, Aphanolaimus strilliae n. sp. (Nematoda: Aphanolaimidae) and Makatinus africanus n. sp. (Nematoda: Aporcelaimidae), and SEM observations on three known species from freshwater sources in the Telperion Nature Reserve (Mpumalanga, South Africa)
FIGURE 11. Female drawings Eutobrilus annetteae (Joubert & Heyns, 1979) Tsalolikhin, 1983 A) Head region showing structure of stoma and tooth pockets; B) Anterior region showing oesophagus; C) Vulval region and genital tract; D) Tail.
FIGURE 18 in Description of two new species, Aphanolaimus strilliae n. sp. (Nematoda: Aphanolaimidae) and Makatinus africanus n. sp. (Nematoda: Aporcelaimidae), and SEM observations on three known species from freshwater sources in the Telperion Nature Reserve (Mpumalanga, South Africa)
FIGURE 18. Scanning electron micrograph of Neotobrilus ampiei (Joubert & Heyns, 1979) Tsalolikhin, 1981 ventral side of male showing distribution and direction of ventrosublateral setae (vsls); supplements S4–S6, and micropappilae (small ar- rows).
FIGURE 20 in Description of two new species, Aphanolaimus strilliae n. sp. (Nematoda: Aphanolaimidae) and Makatinus africanus n. sp. (Nematoda: Aporcelaimidae), and SEM observations on three known species from freshwater sources in the Telperion Nature Reserve (Mpumalanga, South Africa)
FIGURE 20. Light microscopic pictures of Neotobrilus ampiei (Joubert & Heyns, 1979) Tsalolikhin, 1981 female A) Vaginal region with three uterine eggs; B) Anterior end to end of posterior genital tract arrow indicating vulva; C) Labial region showing buccal cavity and two tooth pockets (T1 and T2).
Global and local drivers of the relative importance of allochthonous and autochthonous energy sources to freshwater food webs
<p>Resource quantity (i.e., organic matter; OM) is a main driver of the prevailing energy pathway in freshwater food webs. The OM pool is mainly composed of allochthonous material, a primary resource for freshwater consumers. Contrastingly, small amounts of autochthonous OM (i.e., algae) can subsidize aquatic communities due to its higher nutritional quality. To date, there is no consensus about the relative importance of allochthonous and autochthonous OMs for freshwater food webs or the environmental factors driving their relative importance. We fill this gap by evaluating the relative importance of allochthonous and autochthonous OM sources for freshwater food webs on a global scale through a meta-analytical approach. We gathered the outcome of stable isotope mixing models of 2,789 cases from 58 published studies and calculated a response ratio between the mean contributions of allochthonous and autochthonous OM for freshwater consumers. Using mixed-effect models and a multimodel inference approach, we tested the influence of latitude, habitat type, ecosystem size, climate, and terrestrial productivity over the response ratio. The relative contribution of autochthonous was higher in lotic systems. In lentic systems, increasing terrestrial productivity increased the relative contribution of autochthonous OM, while increasing precipitation and temperature seasonality reduced this relative contribution. We suggested that factors increasing terrestrial productivity might also boost autochthonous OM in these systems, while precipitation increases the transport of allochthonous OM to freshwater habitats. We did not find any relationship between environmental factors and the relative contribution of autochthonous OM for lotic systems. We concluded that the relative contribution of allochthonous and autochthonous energy sources to freshwater food webs differs between lotic and lentic ecosystems and it is dependent on multiple environmental factors.</p>
qPCR data for "An innovative passive sampling approach for the detection of cyanobacterial gene targets in freshwater sources"
<p>qPCR data to accompany the manuscript "An innovative passive sampling approach for the detection of cyanobacterial gene targets in freshwater sources"</p>
Data from: Global patterns and gaps in the study of terrestrial birds and mammals’ use of freshwater sources: A mapping review
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Global and local drivers of the relative importance of allochthonous and autochthonous energy sources to freshwater food webs
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Data from: Live, dead, and fossil mollusks in Florida freshwater springs and spring-fed rivers: taphonomic pathways and the formation of multi-sourced, time-averaged death assemblages
Taphonomic processes are informative about the magnitude and timing of paleoecological changes but remain poorly understood with respect to freshwater invertebrates in spring-fed rivers and streams. We compared taphonomic alteration among freshwater gastropods in live, dead (surficial shell accumulations), and fossil (late Pleistocene-early Holocene in situ sediments) assemblages from two Florida spring-fed systems, the Wakulla and Silver/Ocklawaha Rivers. We assessed taphonomy of two gastropod species: the native <i>Elimia floridensis</i> (n=2504) and introduced <i>Melanoides tuberculata</i> (n=168). We quantified seven taphonomic attributes (aperture condition, color, fragmentation, abrasion, juvenile spire condition, dissolution, and exterior luster) and combined those attributes into a total taphonomic score (TT). Fossil <i>E. floridensis</i> specimens exhibited the greatest degradation (highest TT scores), whereas live specimens of both species were least degraded. Specimens of <i>E. floridensis</i> from death assemblages were less altered than fossil specimens of the same species. Within death assemblages, specimens of <i>M. tuberculata</i> were significantly less altered than specimens of <i>E. floridensis</i>, but highly degraded specimens dominated in both species. Radiocarbon dates on fossils clustered between 9792 and 7087 cal. BP, whereas death assemblage ages ranged from 10,692 to 1173 cal. BP. Possible explanations for the observed taphonomic patterns include: (1) rapid taphonomic shell alteration, (2) prolonged near-surface exposure to moderate alteration rates, and/or (3) introduction of reworked fossil shells into surficial assemblages. Combined radiocarbon dates and taphonomic analyses suggest that all these processes may have played a role in death assemblage formation. In these fluvial settings, shell accumulations develop as a complex mixture of specimens derived from multiple sources and characterized by multi-millennial time averaging. These findings suggest that, when available, fossil assemblages may be more appropriate than death assemblages for assessing pre-industrial faunal associations and recent anthropogenic changes in freshwater ecosystems.
Nutrients revisited: Sources, variability, and contribution of nutrient sources to the nutrient budget of freshwater aquaculture systems
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Datasets and R source code of manuscript "Adding insult to injury: anthropogenic noise intensifies predation risk by an invasive freshwater fish species" by Fernandez Declerck et al.
<p>Datasets and R source code of manuscript "Adding insult to injury: anthropogenic noise intensifies predation risk by an invasive freshwater fish species" by Fernandez Declerck et al. (submitted)</p> <p> Project<br> ├── README<br> ├── data_functional_response.txt<br> ├── data_prey_behaviour.txt<br> ├── R_script.R<br> └── BINV-D-22-00447_Playback.wav</p> <p>Main dataset: 'data_functional_response.txt'. Dataset for the functional response of the predator. Fish behaviour was recorded under two noise conditions (either boat noise or ambient noise). The dataset corresponds to data frame "d" in the script. Variables description:<br> - id: identity of the fish<br> - condition: noise condition, either "boat noise" or "ambient noise"<br> - prey_number: number of chironomid larvae introduced in the tank<br> - prey_captured : number of chironomid larvae consumed<br> - fish_mass : fish body mass (g)<br> - swim_distance: swim distance (m)</p> <p>Secondary dataset: 'data_prey_behaviour.txt'. Dataset for control experiment on prey behaviour. Prey behaviour was recorded under two noise conditions (either boat noise or ambient noise). The dataset corresponds to data frame "f" in the script. We used 20 replicates with 10 replicates for ambient noise condition, and 10 replicates for boat noise condition. Two focal prey larva were observed per replicates. Each prey larva was observed during two time periods (corresponding to two noise sequences). Variables description:<br> - condition: noise condition, either "boat noise" or "ambient noise"<br> - replicate: number of the replicate<br> - unique_id: identity of each focal larva<br> - noise_sequence: number of the noise sequence (either second or third)<br> - prop_inactive: proportion of time spent inactive by the focal larva<br> - prop_active: proportion of time spent active by the focal larva</p> <p>R source code 'code R_script.R'. Complete analysis as one single R script. See comments for additional information.</p> <p>The last file `BINV-D-22-00447_Playback.wav` is an audio file (Waveform Audio File Format). It is the soundtrack used in the playback experiments.</p>
Data from: Live, dead, and fossil mollusks in Florida freshwater springs and spring-fed rivers: taphonomic pathways and the formation of multi-sourced, time-averaged death assemblages
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Sources of oceanic freshwater content along the western Antarctic Peninsula (PAL-LTER Study Region) determined by the stable isotope composition (d18O) of seawater.
The oceanic distribution of d18O is determined largely by the same processes that control salinity. Surface d18O reflects the magnitude and spatial distribution of freshwater inputs, and it is a conservative tracer in the ocean interior. The great benefit of d18O is obtained from the circumstances under which it exhibits behavior different to that of salinity. One such circumstance derives from the salinity and d18O values in precipitation, with salinity being constant with latitude (typically zero), while in general d18O in precipitation becomes progressively isotopically lighter toward the poles. This results in glacial ice (which derives from high-latitude precipitation) being very isotopically light, enabling d18O to be a useful tracer of glacial discharge to the ocean (e.g., Schlosser et al. 1990; Weiss et al. 1979). Another difference occurs in regions influenced by sea ice, which greatly affects salinity during its formation/melt cycle but has only minimal impact on d18O. This decoupling of the two tracers allows them to be used in tandem to quantitatively separate freshwater inputs from sea ice melt and those from meteoric sources (precipitation plus glacial discharge). For this, a simple three-endmember mass balance can be used. For details please see Meredith, M. P., H. J. Venables, A. Clarke, H. W. Ducklow, M. Erickson, M. J. Leng, J. T. M. Lenaerts, and M. R. van den Broeke. 2013. The freshwater system west of the Antarctic Peninsula: Spatial and temporal changes. Journal of Climate 26:1669-1684.
Dataset for "Plant neopolyploidy and genetic background differentiates the microbiome of duckweed across a variety of natural freshwater sources"
<p>Metadata and manifest file for processing 16s paired-end Illumina DNA sequences (generated on an Illumina Mi-Seq). </p>
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
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.