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2,407 results for “nematode”
Taxonomy and Biogeography of Nematode Communities at Harvard Forest 2014
Our overall goal is to describe and map nematode biodiversity in North America. Specifically we will concentrate on Criconematina, a suborder of plant parasitic, soil-dwelling nematodes. Criconematina, commonly referred to as ring-nematodes, are distributed globally associated with a wide range of hosts and habitats. In native grasslands and forests, they may constitute as much as 30% of the below-ground nematode community. Their abundance often approaches 500 individuals per 100cc of soil with as many as a dozen species recorded from a single habitat. Host associations may be broad, covering entire plant families, or they may specialize in feeding on a few closely related plant species. Several are known agronomic pest species, but the vast majority is known only from native habitats and responds negatively to soil disturbance. Due to their sensitivity to disturbance and associations with a range of plant species, some ecologists have suggested that ring nematodes could serve as a below-ground biological indicator of habitat quality. Before this application is possible taxonomic boundaries need to be evaluated and a reference database needs to be established.
Morpho-anatomical traits explain the effects of bacterial-feeding nematodes on soil bacterial community composition and plant growth and nutrition
<p>Soil Bacterial populations</p> <p>V3-V4, of the 16S rRNA gene using the primers 341F CCTAYGGGRBGCASCAG and 806R GGACTACNNGGGTATCTAAT.</p>
BNS01 Nematodes density and composition in the Belowground Plot Experiment at Konza Prairie
The effects of burning, mowing, and nitrogen (N) and phosphorus (P) fertilization on the trophic structure of a tallgrass prairie nematode community were examined in a long-term field experiment established in 1986. Nematode densities and trophic composition were determined in October of 1987, 1989, and 1994 following 2, 4, and 9 years of treatment, respectively.
Unearthed from old soils: New records of Antarctic tardigrades, nematodes, and rotifers in the Prince-Charles Mountains
<p>Supplementary display items genarted by running the code associated with the pre-print "Unearthed from old soils: New records of Antarctic tardigrades, nematodes, and rotifers in the Prince-Charles Mountains". Sequence records will be availble via an online resource upon submission.</p>
Nematodes in canopy gradient sites at the Coweeta Hydrologic Laboratory from 1997 to 1998
Soil nematodes were extracted from litter bags collected from canopy gradient sites as part of: Reynolds, Barbara F.. 2000. Effects of canopy herbivores on soil systems along an elevational gradient. Ph.D. Dissertation. Athens, GA: University of Georgia. These data represent total numbers of nematodes. Different trophic groups are not distinguished. Litter was a combination of red oak and red maple. Nematode counts are based on calculated dry weight of litter.
Nematode functional groups in quadrat treatments on canopy gradient plots
Previous studies have suggested that herbivory in forest canopies can influence forest floor processes such as nutrient cycling and decomposition. We studied the response of litter decomposition to a moisture/productivity gradient with manipulations of the effects of canopy herbivory at the Coweeta Hydrologic Laboratory, North Carolina. Litterbags containing Quercus rubra L. and Acerrubrum L. litter were placed at three elevations along the gradient and sampled monthly for two years. Microarthropods, nematodes, and litter mass loss responses to the productivity gradient were measured. The relative abundance of Collembola and three suborders of mites (Oribatida, Mesostigmata and Prostigmata) was compared across the gradient. Numbers of nematodes per gram dry weight of litter are reported from litterbags placed in quadrat treatment boxes on canopy gradient sites. Treatments used on quadrat boxes include frass additions (boxes 3,8,13,18,23), thrufall additions (boxes 4,9,14,19,24), controls (boxes 5,10,15,20,25), greenfall exclusion (boxes 2,7,12,17,22) and litterfall exclusion (boxes 1,6,11,16,21). Frass and throughfall treatments were initiated in spring of 1998. See Reynolds 2000.
Nematode total numbers in greenfall and litterfall exclusion quadrat treatments on canopy plots in 1998
Numbers of nematodes per gram dry weight of litter are reported from litterbags placed in quadrat treatment boxes on canopy gradient sites. Treatments for this project are greenfall exclusion and litterfall exclusion. See Reynolds 2000 dissertation, Effects of canopy herbivores on soil systems along an elevation gradient. All data are from collections made in 1998.
Microarthropod and nematode effects on soil nitrogen availability in fluffgrass mesocosms at the Jornada Basin LTER site, 1986-1987
This data package contains soil nitrogen measurements taken over a 12-week interval in soils treated to exclude microarthropods and nematodes. The purpose of this study was to test if changing densities of soil microarthropods and nematodes results in changes in soil nitrogen availability. In 1986 and 1987, 110 fluff grass (Dasyochloa pulchella) plants were collected from the Jornada Basin College Ranch and transplanted into pots, which contained 5 replicates of each treatment. The 4 treatments include 1) control, 2) NEMACUR (to exclude nematodes), 3) chlordane (to exclude mites) and 4) NEMACUR + Chlordane. Each was sampled 5 times during a 12-week interval after the initial treatment. Pots were watered weekly to maintain conditions at field capacity. Samples were taken from the rhizosphere and analyzed for NO3(-)- N, NH4(+)-N, Inorganic-N, microbial-N, % H20, % organic matter, root biomass, and nematode density. This study was completed in 1987.
Effects of microarthropod exclusion and water amendments on fluffgrass growth, root nitrogen, and mite and nematode abundance at the Jornada Basin LTER site, 1986-1987
This data package contains data on microarthropods, nematodes, fluff-grass (Dasyochloa pulchella) growth, and root nitrogen in samples from study plots sampled approximately monthly between May 1986 and August 1987 at the Jornada Basin LTER site in southern New Mexico USA. The purpose of this study was to test how watering, and changing densities of soil microarthropods and nematodes, results in changes in fluff grass growth and root nitrogen. Twenty 6 x 6 m plots were established with a 3 m buffer between plots. Five plots were randomly assigned to one of four treatments: 1) Chlordane to exclude microarthropods, 2) Chlordane and water, 3) Water, and 4) Control. At monthly intervals, randomly selected fluff grass plants were collected from each plot. This data set consists of plant diameters (cm), mite soil weight (g), root weight (g), nematode soil weight (g), root total nitrogen (mg/g), and nematode number. This study was completed in November 1987.
BNS02 Belowground Plot Experiment nematode at konza prairie, 1987-2017
This project addresses the long-term effects of fire (annual burning or fire suppression), mowing, and nitrogen (N) and phosphorus (P) fertilization on the structure and composition of a tallgrass prairie nematode community during 30 years of experimental treatments.
Fig. 4 in Two new free-living nematode species (Trefusiina: Trefusiidae) from the Chatham Rise crest, Southwest Pacific Ocean
Fig. 4. Trefusialaimus idrisi sp. nov. Light micrographs. A. Anterior body region of male, lateral view. B. Anterior body region of juvenile, dorsal view. C. Mid-body region of juvenile, showing sperm cells in pseudocoelom. D. Entire male. E. Lateral chord of male, showing round golden inclusions. Arrows point to sperm cells. Scale bar: A-C, E = 15 µm; D = 260 µm.
Fig. 3 in Two new free-living nematode species (Trefusiina: Trefusiidae) from the Chatham Rise crest, Southwest Pacific Ocean
Fig. 3. Trefusialaimus idrisi sp. nov. A. Anterior body region of male. B. Head of male. C. Head of juvenile. D. Right spicule. E. Gubernaculum. F. Male copulatory apparatus. G. Mature sperm. H. Posterior body region of male. Scale bar: A = 40 µm; B-C, G = 20 µm; D-E = 14 µm; F = 28 µm; H = 75 µm.
Fig. 2 in Two new free-living nematode species (Trefusiina: Trefusiidae) from the Chatham Rise crest, Southwest Pacific Ocean
Fig. 2. Trefusia piperata sp. nov. Light micrographs. A. Head region of male, showing buccal cavity, cephalic setae, and clusters of dark granules at base of outer labial setae. B. Spicule and gubernaculum. C. Entire male. Scale bar: A-B = 10 µm; C = 100 µm.
Fig. 1 in Two new free-living nematode species (Trefusiina: Trefusiidae) from the Chatham Rise crest, Southwest Pacific Ocean
Fig. 1. Trefusia piperata sp. nov. A. Anterior body region of female. B. Anterior body region of male. C. Entire female. D. Right spicule and gubernaculum. E. Posterior body region of male. Arrow shows position of vulva. Scale bar: A-B, E = 20 µm; C = 75 µm; D = 8 µm.
Fig. 1 in Are juveniles of the enigmatic deep-sea nematode Rhaptothyreus (Rhaptothyreida: Rhaptothyreidae) parasitic?
Fig. 1. Rhaptothyreus typicus Hope & Murphy, 1969. Line drawings. A. Lateral view of male head. B. Lateral view of moulting juvenile head, with details of surface striations on outer cuticle and outline of amphid under moulting cuticle. C. Anterior body region of male. D. Anterior body region of juvenile. E. Lateral view of male mid-body region. F. Posterior body region of male. G. Posterior body region of juvenile. Arrows show the position of the chord (c) and turgescent cells (t). Scale bar: A–B = 50 µm, C–D = 75 µm, E = 60 µm, F–G = 70 µm.
Fig. 4 in Are juveniles of the enigmatic deep-sea nematode Rhaptothyreus (Rhaptothyreida: Rhaptothyreidae) parasitic?
Fig. 4. Rhaptothyreus typicus Hope & Murphy, 1969. Scanning electron micrographs. A-B. Male head. C. Juvenile head. D. Male posterior body region. Scale bar: A = 20 µm, B = 8 µm, C = 12 µm, D = 16 µm.
Fig. 3 in Are juveniles of the enigmatic deep-sea nematode Rhaptothyreus (Rhaptothyreida: Rhaptothyreidae) parasitic?
Fig. 3. Rhaptothyreus typicus Hope & Murphy, 1969. Light micrographs (moulting juvenile). A. Lateral view of head, showing stylet-like structure. B. Sharp transition between anterior (left) and posterior trophosome (right). C. Lateral chord, mid-body region. D. Posterior body region. Scale bar: A = 20 µm, B = 40 µm, C = 28 µm, D = 25 µm.
Fig. 2 in Are juveniles of the enigmatic deep-sea nematode Rhaptothyreus (Rhaptothyreida: Rhaptothyreidae) parasitic?
Fig. 2. Rhaptothyreus typicus Hope & Murphy, 1969. Light micrographs (♂). A. Lateral view of head showing amphid. B. Mid-body region showing cuticle, turgescent cells and portion of anterior trophosome with rod-shaped structures. C. Cells of lateral chord with clear, round inclusions. D. Posterior body region. Arrows show the position of the two small ducts apparently joining just prior to the cloacal opening. Scale bar: A, C = 20 µm, B = 18 µm, C = 30 µm.
Fig. 18 in Deep-sea nematodes (Comesomatidae) from the Southwest Pacific Ocean: five new species and three new species records
Fig. 18. Kenyanema monorchis Muthumbi et al., 1997. A. Anterior region of ♀; B: lateral surface view of Ƌ head. C. Lateral view of Ƌ head (cross-section). D. Posterior region of Ƌ showing copulatory apparatus. E. ♀ gut, posterior body region. F. ♀ tail. Scale bar = 25 μm.
Fig. 17 in Deep-sea nematodes (Comesomatidae) from the Southwest Pacific Ocean: five new species and three new species records
Fig. 17. Hopperia beaglense Chen and Vincx, 1998 light micrographs. A. Anterior region of Ƌ. B. Ƌ gut, showing clusters of small round inclusions with smaller orange-brown granules. C. Spinneret. Scale bar: A = 30 μm; B = 12 μm; C = 24 μm.
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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.
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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.
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