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679 results for “crayfish”
North Temperate Lakes LTER: Crayfish Abundance 1981 - current (Reformatted to a Darwin Core Archive)
This data package is formatted as a Darwin Core Archive (DwC-A, event core). For more information on Darwin Core see https://www.tdwg.org/standards/dwc/. This Level 2 data package was derived from the Level 1 data package found here: https://pasta.lternet.edu/package/metadata/eml/edi/287/3, which was derived from the Level 0 data package found here: https://pasta.lternet.edu/package/metadata/eml/knb-lter-ntl/3/29. The abstract below was extracted from the Level 0 data package and is included for context: Crayfish data include crayfish catch in cylindrical minnow traps baited with beef liver and occasional occurrence in other gear used to sample fish. Traps are placed at fyke net locations in nine study lakes (Allequash, Big Muskellunge, Crystal, Sparkling, Trout, Mendota, Monona, Wingra and Fish). Crayfish traps have been eliminated as gear in the Madison area lakes (Mendota, Monona, Wingra, and Fish) after 2003. Individuals are identified to species and counted. In Trout and Sparkling Lake more detailed surveys have been conducted during the summer on an ad hoc basis to track distribution and abundance of the invading species Orconectes rusticus. Additional data sets consist of pre-LTER sets (initiated in late June 1972) gathered by Capelli (Ph.D. dissertation) and Lorman (Ph.D. dissertation). Most of pre-LTER data is detailed distribution in Trout Lake, and community composition in other area lakes. Sampling Frequency: annually Number of sites: 9 Note that 2020 data does not exist due to insufficient sampling.
The importance of crayfish in the breakdown of rhododendron leaf litter at the Coweeta Hydrologic Laboratory in 1999
Rhododendron (Rhododendron maximum) is a common evergreen shrub in riparian areas of the southern Appalachians, where its leaves can comprise a large proportion of leaf litter in streams. However, they are relatively refractory and generally considered a low quality food resource for detritivores. Our objective was to assess whether macroconsumers (primarily crayfish (Cambarus bartonii)) influence rhododendron leaf breakdown in a forested southern Appalachian stream in both summer (when leaves other than rhododendron are relatively scarce) and autumn (when other leaves are relatively abundant). We conducted two leaf decay experiments, one in summer and one in autumn, using pre-conditioned leaves. Macroconsumers were excluded from the benthos of a fourth-order stream using electric fences; we predicted that excluding macroconsumers would reduce the decay rate of rhododendron leaves in both summer and autumn.
Data from: Non-consumptive predator effects modify crayfish induced bioturbation as mediated by limb loss: field and mesocosm experiments
1. We addressed the implications of limb loss and regeneration for multi-species interactions and their impacts on ecosystem engineering in freshwater stream environments. 2. We included regenerative and non-regenerative crayfish as well as fish predators in a 2x2 factorial design to assess the effects on water turbidity of interactions between crayfish ecosystem engineers differing in regenerative status and their fish predators. 3. We demonstrated that crayfish limb loss and predation risks lead to more turbidity in field and mesocosm conditions. Moreover, ongoing regeneration of crayfish increased turbidity, while fish presence seemed to hinder crayfish turbidity-inducing behaviors (such as tail-flipping and burrowing) in the mesocosm experiment. 4. We confirmed that greater numbers of crayfish produce a greater amount of turbidity in-situ in streams. 5. Although mechanical burrowing crayfish capacities may depend on crayfish burrowing classification (primary, secondary, or tertiary), our work emphasizes the implication for turbidity levels of crayfish autotomy in freshwater streams.
FIGURE 8 in Cambarus (Depressicambarus) clairitae, a new species of crayfish (Decapoda: Cambaridae) from Alabama with a review of the halli Group in the subgenus Depressicambarus
FIGURE 8. Antennal colors of: A. Cambarus clairitae, n. sp.; B. C. englishi; C. C. halli.
Figure 1. from Euastacus morgani sp. n., a new spiny crayfish (Crustacea, Decapoda, Parastacidae) from the highland rainforests of eastern New South Wales, Australia - ZooKeys 85: 17-26 (11 March 2011) https://doi.org/10.3897/zookeys.85.1237
Figure 1. - Euastacus morgani sp. n. Female specimen, ACP 1103.
Data from: Limiting burrowing activity and overland dispersal of the invasive alien red swamp crayfish Procambarus clarkii by sophisticated design of watercourses
<p>Two datasets belonging to the paper "Limiting burrowing activity and overland dispersal of the invasive alien red swamp crayfish <i>Procambarus clarkii</i> by sophisticated design of watercourses" published in Ecological Engineering (https://doi.org/10.1016/j.ecoleng.2022.106787), are provided here. </p><p> </p><p>The first dataset "Burrow data from Limiting burrowing activity and overland dispersal P. clarkii.csv" contains data from an inventory of crayfish burrows in three watercourses in the municipality of Horssen (Province of Gelderland), the Netherlands. These data were collected during a lowering of the water level in these watercourses, which takes place annually in the winter period to prevent nuisance from excessively high phreatic groundwater in agricultural areas. The sites were located up to 5 km apart. On each bank, red swamp crayfish burrows with tunnel openings in banks below the shoreline were counted from the opposite bank of the watercourse using binoculars. This field survey was performed in March 2019 when the water level was lowered for the maintenance of the watercourses. The chance of overlooking burrows was very low as the vegetation cover was low in this period. Three sites with 'natural-like' banks (banks rehabilitated to a natural profile during rehabilitation projects, in the dataset referred to as 'natural' banks) were chosen in the area with a lowered water level and presence of red swamp crayfish. At site 1, 2 and 3, a total of 125, 46 and 18 bank transects respectively, each one 10 metres long, were surveyed. Banks were categorized as follows: (a) non-natural (steep, <i>viz</i>. > 40°, and barely vegetated; n = 77), (b) semi-natural (steep with some vegetation; n = 50), and (c) natural (gentle sloping, <i>viz</i>. < 25°, with a diverse, well-developed submerged and emergent vegetation; n = 62). See the paper for schematic cross-sections of three bank types.</p><p>The second dataset "Inclination experiment data from Limiting burrowing activity and overland dispersal P. clarkii.csv" contains data of an inclination experiment to relate frequencies of overland movement of the red swamp crayfish to several inclinations and substrate types. For this purpose, a wooden plate of 120 x 180 cm with a 10 cm thick layer of soil was used as a base on which three lanes of 40 cm wide and 180 cm long were constructed with one substrate type each: a) bare sandy soil, b), species-poor grassland with low (2-5 cm) vegetation and c) tall (40-50 cm) herbaceous-rich grassland. Inclinations applied for this experiment were 0°, 10°, 20° and 30°. Individuals were randomly selected for each treatment and placed in the middle of a lane and oriented perpendicular to the lane. After each trial, the crayfish was placed back in the water container and replaced by another crayfish. There was a minimum period of at least one hour between each trial for each crayfish. Each crayfish was used once for each substrate type and inclination test, and the treatment order was randomised for each animal. A crayfish was placed in the middle of the lane and could freely move around for a period of three minutes. Hereafter, by the change of its position on the lane after 3 minutes it was recorded whether an individual moved up (or left in case of 0°), down (or right in case of 0°), or did not move. In total, 273 trials were conducted. Trial numbers differ between treatments due to mortality of three animals during storage.</p><p> </p><p>Abstract</p><p> </p><p>Invasive alien crayfish species pose major ecological and hydrological risks globally. The red swamp crayfish (<i>Procambarus clarkii</i>) is one of the most widespread crayfish species worldwide. Its impacts arise from burrowing activities and lead to mobilization of soil nutrients, water safety risks by instability of dikes and erosion of banks. Increased sediment load demands additional dredging of drainage ditches and canals to ensure their water discharge capacity. Sustainable methods for limiting burrowing in banks and dispersal behaviour of crayfish were not yet available. Therefore, a field study was performed to determine whether the number of burrows and overland movement of crayfish were related to a particular bank type. Burrows were counted in three watercourses during a water-level decline. The number of burrows was significantly lower in natural banks than in non-natural and semi-natural banks. The construction of natural-like banks along watercourses may significantly reduce sediment load, erosion and the collapse of banks by burrowing activities of crayfish. An inclination experiment mimicking various types of terrestrial dispersal barriers elucidated that steepness, soil type and vegetation structure of small embankments near watercourses were significant factors for manipulating overland movement of crayfish. Crayfish were taken out of the water for this purpose and placed on small experimental embankments varying in slope and types of vegetation. The lowest frequencies of upward movement were recorded at inclinations of 20° and 30° on bare sandy soil and short and species-poor grassland substrates. This implies that crayfish crawling out of the water will return to the watercourse when encountering such a dispersal barrier. Therefore, a sophisticated design of embankments along watercourses can be a tool to reduce colonization risk of nearby located, hydrologically isolated water bodies with high nature values. </p>
DNA barcoding is currently unreliable for species identification in Crayfish
<p>DNA barcoding is commonly used for species identification. Despite this, there has not been a comprehensive assessment of the utility of DNA barcoding in crayfishes (<em>Decapoda</em>: <em>Astacidea</em>). Here we examined the extent to which local barcoding gaps (used for species identification) and global barcoding gaps (used for species discovery) exist among crayfishes, and whether global gaps, if present, met a previously suggested 10 × threshold.</p> <p>Using publicly available mitochondrial COI sequence data from the National Center for Biotechnology Information's nucleotide database, we created two versions of the COI datasets used for downstream analyses: one focused on the number of unique haplotypes (N<sub>H</sub>) per species, and another that focused on total number of sequences (N<sub>S</sub>; i.e., including redundant haplotypes) per species. Ultimately, a total of 81 species were included, with 58 species and five genera from family <em>Cambaridae</em> and 23 species from three genera from family <em>Parastacidae</em>.</p> <p>We found that local barcoding gaps were present in only 30 species (20 members of <em>Cambaridae </em>and 10 <em>Parastacidae</em>). Global barcoding gaps were detected in only four genera (<em>Cambarus, Cherax, Euastacus, and Tenuibranchiurus</em>), and they were all well below the previously suggested 10× threshold. We propose that a ~5x threshold could act as a more appropriate working hypothesis for species discovery. While the N<sub>H</sub> and N<sub>S</sub> datasets yielded largely similar results, there were some discrepant inferences.</p> <p>Currently, the utility of DNA barcoding for species identification and discovery in crayfish is quite limited, and caution should be exercised when molecular approaches are used in place of taxonomic expertise.</p> <p>Assessment of the evidence for local and global barcoding gaps is important for understanding the reliability of molecular species identification and discovery, but outcomes are dependent on the current state of taxonomy. As this improves (e.g., via resolving species complexes, possibly elevating some subspecies to the species-level status, and redressing specimen misidentifications in natural history and other collections), so too will the utility of DNA barcoding.</p>
FIG. 9 in Crayfishes from the Jehol biota
FIG. 9. — Distribution of pleon length to uropodal exopod length ratios.
Fig. 3 in Distribution Of Freshwater Crayfish In Latvia
Fig. 3. Distribution of narrow-clawed crayfish in Latvia (1992-2018).
Fig. 2 in Distribution Of Freshwater Crayfish In Latvia
Fig. 2. Distribution of noble crayfish in Latvia (1992-2018).
Figure 1 in A New Species of the Freshwater Crayfish Genus Euastacus (Decapoda: Parastacidae) from Northeastern New South Wales, Australia
Figure 1. Collection locality of Euastacus mirangudjin n.sp.
Figure 2. Euastacus mirangudjin n in A New Species of the Freshwater Crayfish Genus Euastacus (Decapoda: Parastacidae) from Northeastern New South Wales, Australia
Figure 2. Euastacus mirangudjin n.sp. Dorsal view, holotype. Photograph by Max Egan.
Fig. 11 in New Findings Of White Clawed Crayfish, Austropotamobius Pallipes (Decapoda, Astacidae), And Peculiarities Of Its Spatial Distribution In Neretvica (Bosnia And Herzegovina)
Fig. 11. Size structure of cray fish by locations.
Fig. 10 in New Findings Of White Clawed Crayfish, Austropotamobius Pallipes (Decapoda, Astacidae), And Peculiarities Of Its Spatial Distribution In Neretvica (Bosnia And Herzegovina)
Fig. 10. Isobath maps (depth, m), isotach map (velocity, m/s) — autumn.
Fig. 7 in New Findings Of White Clawed Crayfish, Austropotamobius Pallipes (Decapoda, Astacidae), And Peculiarities Of Its Spatial Distribution In Neretvica (Bosnia And Herzegovina)
Fig. 7. Typical crayfish habitats in the Gorovnik.
Fig. 1 in New Findings Of White Clawed Crayfish, Austropotamobius Pallipes (Decapoda, Astacidae), And Peculiarities Of Its Spatial Distribution In Neretvica (Bosnia And Herzegovina)
Fig. 1. Map of the research area.
Fig. 9 in New Findings Of White Clawed Crayfish, Austropotamobius Pallipes (Decapoda, Astacidae), And Peculiarities Of Its Spatial Distribution In Neretvica (Bosnia And Herzegovina)
Fig. 9. Lowest habitat of the crayfish in the Neretvica.
Fig. 8 in New Findings Of White Clawed Crayfish, Austropotamobius Pallipes (Decapoda, Astacidae), And Peculiarities Of Its Spatial Distribution In Neretvica (Bosnia And Herzegovina)
Fig. 8. Isobath map (depth, m) and isotach map (velocity, m/s) — autumn 2017.
Fig. 2 in New Findings Of White Clawed Crayfish, Austropotamobius Pallipes (Decapoda, Astacidae), And Peculiarities Of Its Spatial Distribution In Neretvica (Bosnia And Herzegovina)
Fig. 2. General view of the confluence of the Prolaz tributary into the Neretvica.
Fig. 1 in The Thick-Clawed Crayfish, Astacus Pachypus (Crustacea, Decapoda, Astacidae), In Ukraine: Karyotype, Allozymes And Morphological Parameters
Fig. 1. Locations of samples of four crayfish species in Ukraine.
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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)
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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.