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679 results for “crayfish”
Figure 5 in It's a Trap! An evaluation of different passive trap types to effectively catch and control the invasive red swamp crayfish (Procambarus clarkii) in streams of the Santa Monica Mountains
Figure 5. Mean crayfish counts by size (cm) class across twelve trap types with standard error bars.
Figure 2 in It's a Trap! An evaluation of different passive trap types to effectively catch and control the invasive red swamp crayfish (Procambarus clarkii) in streams of the Santa Monica Mountains
Figure 2. Six standard, base trap types used in this study; a = Steel silver Gee Minnow trap, b = Vinyl coated black Promar Minnow trap, c = Mountain Restoration Trust custom design pyramid trap, d = Collapsible red square mesh Promar 501 trap, e = Colapsible cylindrical black mesh Promar 503 trap, and f = Mountain Restoration Trust custom PVC tube/refuge traps. Specific modifications to these traps to create the 12 types tested are provided in Table 1.
Figure 1 in It's a Trap! An evaluation of different passive trap types to effectively catch and control the invasive red swamp crayfish (Procambarus clarkii) in streams of the Santa Monica Mountains
Figure 1. Placement of traps compared in study in Las Virgenes Creek within Malibu Creek State Park. Inset shows specific study location within a regional context. Section locations were selected based on their representativeness of habitat types occurring over the entire reach (i.e. amount of riffle, runs and pools being comparable) and presence of suitable habitat for trap placement and visual observance of crayfish, tadpoles and native chub.
Figure 7 in It's a Trap! An evaluation of different passive trap types to effectively catch and control the invasive red swamp crayfish (Procambarus clarkii) in streams of the Santa Monica Mountains
Figure 7. Mean catches by stream habitat type. Differences in mean catches between stream Pools vs. Runs was evaluated using Wilcoxon rank-sum tests. * P-value <0.05.
Figure 3 in It's a Trap! An evaluation of different passive trap types to effectively catch and control the invasive red swamp crayfish (Procambarus clarkii) in streams of the Santa Monica Mountains
Figure 3. Mean catch per trap type with standard errors. Letters indicate significantly different mean counts within groups.
Figure 6 in It's a Trap! An evaluation of different passive trap types to effectively catch and control the invasive red swamp crayfish (Procambarus clarkii) in streams of the Santa Monica Mountains
Figure 6. Mean chub counts by size class across twelve trap types with standard error bars. Size classes include small as ≤ 60mm, medium as 61–89 mm, and large as 89–150mm as described by O'Brien et al. (2011).
Figure 3 in Management of invasive, plague-carrying signal crayfish by physical exclusion barriers
Figure 3. Discharge of the Bottwar stream (blue line) since construction of the barriers (daily means measured in the lower course of the stream, obtained from the "Umweltinformationssystem (UIS) der LUBW Landesanstalt für Umwelt Baden-Württemberg"). The horizontal hatched line corresponds to the stream discharge at which the 1st, flow-based barrier (B1) was effective to exclude signal crayfish during the in-situ assessment of barrier efficacy (date highlighted by vertical line). The red ticks beside the time axis indicate days with a stream discharge lower than 0.95 x this threshold, i.e., conditions at which barrier functionality has been presumably compromised by low stream flow. Please note the marked increase in duration and intensity of extreme low-flow conditions since 2018.
Figure 2 in Management of invasive, plague-carrying signal crayfish by physical exclusion barriers
Figure 2. Distribution of native and invasive crayfish species in the study area from 2011 to 2020, as indicated by monitoring data of the Fisheries Research Station (2011–2014) and the intensive crayfish surveys in 2017 and 2020 (this study; Table S2 and Figure S2). The signal crayfish distribution prior to 2013 remains unknown, as indicated by the question mark in the top left panel. Dots represent the exclusion barriers implemented in 2014 (numbered in direction of upstream signal crayfish spread; fill color indicates barrier functionality with pink = flow-based and yellow = waterfall-based). Detail maps in the lower panels show the fine-scale signal crayfish distribution at B1.
Figure 1 in Management of invasive, plague-carrying signal crayfish by physical exclusion barriers
Figure 1. Overview of the study area and the known crayfish distribution in 2014 (A, B), and location and pictures of the three exclusion barriers (modified pipe culverts; panel C; please note the rotated map); fill color indicates barrier functionality with pink = flow-based and yellow = waterfall-based barriers. Blue arrows indicate the direction of stream flow. The red arrow in A denotes the study area.
Fig. 1 in Crayfish In Latvia
Fig. 1. Distribution of crayfish species in Latvia Fig. 2. Distribution of crayfish species in Latvia in 1967 (Jurane 1967). in 2004 (Arens 2004).
Fig. 2 in An illustrated key to the Bulgarian freshwater crayfish species of family Astacidae (Crustacea: Decapoda)
Fig. 2. Astacus leptodactylus: a/ spines behind cervical groove; b/ rostrum; c/ abdominal pleura 2-4; d/ second gonopod with talon.
Fig. 3 in An illustrated key to the Bulgarian freshwater crayfish species of family Astacidae (Crustacea: Decapoda)
Fig. 3. Astacus astacus: a/ spines behind cervical groove; b/ rostrum; c/ abdominal pleura 2-4; d/ second gonopod.
Figure 3 in Diceratocephala boschmai (Platyhelminthes: Temnocephalida) from crayfish farms in Thailand: investigation of the topographic surface and analysis of 18S ribosomal DNA sequences
Figure 3. The neighbor-joining phylogenetic tree based on the 18S rDNA gene, showing the relationships of D. boschmai with 29 other turbellarian species.
Figure 2 in Diceratocephala boschmai (Platyhelminthes: Temnocephalida) from crayfish farms in Thailand: investigation of the topographic surface and analysis of 18S ribosomal DNA sequences
Figure 2. Surface topography of D. boschmai. A–C) Unhatched and hatched eggs; D) ventral view of a specimen; E) mouth with protruding pharynx; F) thread-like filaments adhered to the pharynx; G, H) a higher magnification of write-dot boxes in 2E; I, J) a higher magnification of write-dot boxes in 2D; K) ventral view of a specimen at posterior end; L) dorsal view of a specimen; M) a higher magnification of write-dot box in Figure L. ad, adhesive disc; af, adhered filaments; ci, ciliated cell; ds, double spines; fi, filament; gr, groove; gv, gravel-like units; in, intertentacular flange; mo, mouth; op, opercular plate; pe, peduncle; pi, pit; sp, single spine; tb, trabecular meshwork; tc, tentacle; th, thread-like filaments; tr, trunk; vi, villi..
Figure 1. A in Diceratocephala boschmai (Platyhelminthes: Temnocephalida) from crayfish farms in Thailand: investigation of the topographic surface and analysis of 18S ribosomal DNA sequences
Figure 1. A) C. destructor harboring adult D. boschmai and eggs of flatworm; B) dorsal view of an extending body; C) diagram of organ structures in dorsal view; D) diagram of reproductive complex; E, F) photomicrograph and diagram of penial stylet, respectively; G) unhatched and hatched eggs. ad, adhesive disc; at, atrium; cv, contractile vesicle; ds, dorsal side; es, ejaculatory sac; ey, eye; ev, excretory vesicle; fi, filament; in, intertentacular flange; ine, intestine; int, introvert; mo, mount; ov, ovary; pe, peduncle; pf, plane of fracture; ph, pharynx; pn, subepidermal pigment network; ps, penial stylet; rv, resorbens vesicle; s, stalk; se, seminal vesicle; sr, seminal receptacle; sp, sclerotized papillae; tc, tentacle; te, testis; tg, tentacular gland; ve, vasa efferentia; vg, vagina; vi, vitellaria; vs, ventral side.
Linked collectors and determiners for: Two new species of freshwater crayfish of the genus Faxonius (Decapoda: Cambaridae) from the Ozark Highlands of Arkansas and Missouri.
Natural history specimen data linked to collectors and determiners held within, "Two new species of freshwater crayfish of the genus Faxonius (Decapoda: Cambaridae) from the Ozark Highlands of Arkansas and Missouri". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="https://bionomia.net/dataset/6c711c6e-5983-41a5-9ba0-133ac3e85f4a">https://bionomia.net/dataset/6c711c6e-5983-41a5-9ba0-133ac3e85f4a</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/6c711c6e-5983-41a5-9ba0-133ac3e85f4a">https://gbif.org/dataset/6c711c6e-5983-41a5-9ba0-133ac3e85f4a</a>. Formatted as a Frictionless Data package.
Linked collectors and determiners for: eDNA‑based detection of the invasive crayfish Pacifastacus leniusculus in streams with a LAMP assay using dependent replicates to gain higher sensitivity.
Natural history specimen data linked to collectors and determiners held within, "eDNA‑based detection of the invasive crayfish Pacifastacus leniusculus in streams with a LAMP assay using dependent replicates to gain higher sensitivity". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="https://bionomia.net/dataset/ea16e238-4e23-41fb-9eee-c1ea4f0caa63">https://bionomia.net/dataset/ea16e238-4e23-41fb-9eee-c1ea4f0caa63</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/ea16e238-4e23-41fb-9eee-c1ea4f0caa63">https://gbif.org/dataset/ea16e238-4e23-41fb-9eee-c1ea4f0caa63</a>. Formatted as a Frictionless Data package.
Temperature affects predation of schistosome-competent snails by a novel invader, the marbled crayfish Procambarus virginalis
<p><span>The human burden of environmentally transmitted infectious diseases can depend strongly on ecological factors, including the presence or absence of natural enemies. The marbled crayfish (<em>Procambarus</em> <em>virginalis</em>) is a novel invasive species that can tolerate a wide range of ecological conditions and colonize diverse habitats. Marbled crayfish first appeared in Madagascar in 2005 and quickly spread across the country, overlapping with the distribution of freshwater snails that serve as the intermediate host of schistosomiasis–a parasitic disease of poverty with human prevalence ranging up to 94% in Madagascar. It has been hypothesized that the marbled crayfish may serve as a predator of schistosome-competent snails in areas where native predators cannot and yet no systematic study to date has been conducted to estimate its predation rate on snails. Here, we experimentally assessed marbled crayfish consumption of uninfected and infected schistosome-competent snails (<em>Biomphalaria</em> <em>glabrata</em> and <em>Bulinus</em> <em>truncatus</em>) across a range of temperatures, reflective of the habitat range of the marbled crayfish in Madagascar. We found that the relationship between crayfish consumption and temperature is unimodal with a peak at ~27.5°C. Per-capita consumption increased with body size and was not affected either by snail species or their infectious status. We detected a possible satiation effect, i.e., a small but significant reduction in per-capita consumption rate over the 72-hour duration of the predation experiment. Our results suggest that ecological parameters, such as temperature and crayfish weight, influence rates of consumption and, in turn, the potential impact of the marbled crayfish invasion on snail host populations. </span></p>
Temperature affects predation of schistosome-competent snails by a novel invader, the marbled crayfish Procambarus virginalis
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Are you anxious yet? Investigating the effects of citalopram on the physiology and behavior of the rusty crayfish (Faxonius rusticus)
Selective serotonin reuptake inhibitors (SSRI) are a growing group of pollutants that are increasingly causing detrimental changes to aquatic ecosystems. Upon entering aquatic habitats, these chemicals affect both vertebrates and invertebrates by influencing fecundity, aggression, exploration, and mortality in non-target organisms. In crustaceans, more specifically in crayfish and lobsters, since serotonin (5-Hydroxytryptamine, 5-HT) has been linked to a suite of stress responses and agonistic behaviors, SSRIs have the potential to harm these organisms significantly. In this study, we aimed to quantify the effects of a twenty-one day exposure of citalopram on the behavior and physiology of the rusty crayfish (Faxonius rusticus). Crayfish were exposed to an environmentally relevant concentration (1 μg / L) of citalopram in their tank water for 21 days and perform physiological (oxygen consumption and stress analysis) and behavioral (flight initiation distance) assays. Changes in behavior (reaction distance), physiology (oxygen consumption), and neurotransmitter levels (stress) were used to quantify any effects due to citalopram exposure. We found that as the length of exposure increased, regardless of citalopram presence, the oxygen consumption rate decreased significantly. Females that were injected with supplemental 5-HT froze closer to a novel stimulus than males or individuals from other treatment groups. Females also took longer to explore the arena than males, regardless of treatment. The amount of 5-HT present in individuals increased with mass, but this was not observed in individuals exposed to an external stressor regardless of the presence or absence of citalopram in their system. Exposure to 1 μg / L of citalopram for 21 days did not significantly impact crayfish behavior, but behavior and oxygen consumption were impacted by sex and isolation length, respectively. While this concentration of citalopram did not alter behavior or physiology, further work is
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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.