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191 results for “otters”
SBC LTER: Reef: Sightings of sea otters (Enhydra lutris) near Santa Barbara and Channel Islands, ongoing since 2007
These data describe the number, location and activity or behavior of sea otters (Enhydra lutris) individuals observed along the Santa Barbara Coast and local Channel Islands, during SBC LTER field sampling. Observations began in 2007. Records are collected regularly at SBC core sites and opportunistically while research staff are underway or travelling between sites. Locations are included, but some latitudes and longitudes are approximate.
Data from: Tool use increases mechanical foraging success and tooth health in southern sea otters (Enhydra lutris nereis)
<p>Although it is well documented that tool use can enable the utilization of novel resources, the fitness benefits associated with this innovative behavior are difficult to test. Using longitudinal data from 196 radio-tagged southern sea otters, we found that individuals, particularly females, with frequent tool use gained access to harder, larger prey items. In turn, the mechanical advantages of tool use during food processing translated to reduced tooth damage in tool users. We also found that tool use diminishes trade-offs between access to different prey types, tooth health, and caloric intake that are highly dependent on the relative availability of prey in the environment. Overall, tool use allows individuals to maintain caloric requirements through the processing of alternative prey that are otherwise inaccessible without the use of tools, indicating that this innovative behavior is a necessity for the survival of southern sea otters in environments with depleted preferred prey.</p>
Fig. 3 in Observation Of Eurasian Otter'S Diel Activity Using Camera Trapping In Central-Eastern Romania
Fig. 3. The activity pattern of the otter in the three protected areas, based on the number of otter recordings at the observation sites during March 2011–April 2016.
Fig. 6 in Observation Of Eurasian Otter'S Diel Activity Using Camera Trapping In Central-Eastern Romania
Fig. 6. Seasonal activity patterns of Lutra lutra in the study area during the study period based on the number of otter crossings through the observation sites.
Data and R code used for the GLMM and NBDA analyses in 'Captive Asian short-clawed otters (Aonyx cinereus) learn to exploit unfamiliar natural prey'
<p>Foraging plays a vital role in animal life histories, learning whether unfamiliar food items are palatable is a key part of this process. Animals that engage in extractive foraging must also learn how to overcome the protective measures of their prey. While otters (subfamily Lutrinae) are a taxon known for their extractive foraging behaviour, how they learn about prey palatability and acquire extractive foraging techniques remains poorly understood. Here we investigated: (i) how captive Asian short-clawed otters (<em>Aonyx cinereus</em>) learned to interact with, and extract meat from, unfamiliar natural prey, and (ii) how their exploitation of such prey compared to their ability to overcome artificial foraging tasks containing familiar food rewards. Network-based diffusion analysis showed that otters learned to interact with unfamiliar natural prey by observing their group mates. However, once interacting with the prey, they learned to extract the meat mainly asocially. In addition, otters took longer to overcome the protective measures of unfamiliar natural prey than those of extractive food puzzles. Asian short-clawed otter populations are declining in the wild. Increasing our understanding of how they learn to overcome novel foraging challenges could help develop pre-release training procedures as part of reintroduction programmes for otter conservation.</p>
Dataset: Otter Tail Corporation (OTTR) Stock Performance
This dataset provides historical stock market performance data for specific companies. It enables users to analyze and understand the past trends and fluctuations in stock prices over time. This information can be utilized for various purposes such as investment analysis, financial research, and market trend forecasting.
Fig. 2 in Diet Composition Of Otters (Lutra Lutra L.) Living On Small Watercourses In Southwestern Hungary
Fig. 2. The diet pattern of otters living by streams and channels in the Dráva region. For locations (W1–5) see Fig. 1, n = number of spraint samples
Fig. 1 in Diet Composition Of Otters (Lutra Lutra L.) Living On Small Watercourses In Southwestern Hungary
Fig. 1. Locality of the small watercourses studied in the Drava region. 1 = Dombó-channel (W1, Gyékényes), 2 = Dombó-channel (W2, Berzence), 3 = Babócsai stream (W3, Babócsa), 4 = Barcs-Kom-
Fig. 3 in Diet Composition Of Otters (Lutra Lutra L.) Living On Small Watercourses In Southwestern Hungary
Fig. 3. Percentage biomass consumption (mean±SE) of fish prey in the diet of otters living by streams and channels, on the basis of fish weight (a) and guild (b). Fish guilds: RE – reophilic or flow preferring, EU – eurytopic or tolerant for rivers and stagnant waters and ST – stagnophilic or stagnant water
Fig. 1 in Sea otter health: Challenging a pet hypothesis
Fig. 1. Parasites that spillover from wildlife to sea otters. Top cycle: cats (like this bobcat) are the final host for the protozoan Toxoplasma gondii, for which sea otters are normally a dead-end host. Opossums drive a similar cycle for Sarcosystis neurona. Although pet cats were once blamed as the primary source of toxoplasmosis in sea otters, new evidence shows stronger associations with locations where wild cats are common (Burgess et al., 2013). Bottom cycle: diving ducks (like this surf scoter) and shorebirds are the final hosts for acanthocephalans that use sand crabs as intermediate hosts. Otters become accidental hosts if they eat sand crabs. Although many papers and the popular press purport that human actions put sea otter health at risk, these parasites are a natural, long-standing problem for sea otters.
Fig. 3 in Morphological and molecular characterization of Cystoisospora sp. from Asian small-clawed otters Aonyx cinereus
Fig. 3. Mid-point rooting tree of Cystoisospora spp. inferred from concatenated alignment of two nucleotide sequences (18S and cox1). Nucleotide sequences of Cystoisospora spp. GenBank/DDBJ/EMBL accession numbers for 18S and cox1 are shown next to species names. Nodal support values (NJ/ML) greater than 60% are represented on ML branches. Scale bar represents 0.01 nucleotide substitutions per sites.
Fig. 2 in Morphological and molecular characterization of Cystoisospora sp. from Asian small-clawed otters Aonyx cinereus
Fig. 2. Line drawing of sporulated oocysts of Cystoisospora rivolta-like oocysts from small-clawed otters. Bar = 10 μm.
Fig. 1 in Morphological and molecular characterization of Cystoisospora sp. from Asian small-clawed otters Aonyx cinereus
Fig. 1. Photographs of Cystoisospora oocysts detected from Asian small-clawed otters. (a and b) Immature oocysts containing one (a) or two sporoblasts (b). (c) Mature oocysts containing two sporocysts, each with four club-shaped sporozoites. Sporozoites contained rounded retractile vacuoles (arrow). (d–f) Sporozoites containing sporocyst residuum, which was composed of numerous small granules (d and e) or a rounded granule (f).
Fig. 1 in Molecular characterization and prevalence of Halarachne halichoeri in threatened southern sea otters (Enhydra lutris nereis)
Fig. 1. (A) Scanning electron microscopy of adult Halarachne halichoeri showing opisthosoma (abdomen) with slight constriction only at the anterior end and dorsal shield broader posteriorly than anteriorly with linguiform caudal tip. (B) Scanning electron microscopy of larvae Halarachne halichoeri with postanal setae (bristles) longer than adanal setae.
Fig. 2 in Testing microsatellite loci and preliminary genetic study for Eurasian otter in South Korea
Fig. 2. Locations of sampling for tissue (1. Hoengseong-gun, Gangwon-do, 2. Uljin-gun, Gyeongsangbuk-do, 3. Jeongeup-si, Jeollabukdo, 4. Muju-gun, Jeollabuk-do, 5. Hampyeong-gun, Jeollanam-do).
Figure 4 in Optimal FOraging OF NeOtrOpical Otters (CarnivOra: Mustelidae) in an urban river and predOminance OF generalist and sedentary fish in their diet
Figure 4. Results of the Ivlev's selectivity index for the dataset from: (A) May 2006 to September 2007; (B) September 2006 to January 2007 (wet season); (C) February to August 2007 (dry season).
Fig. 1 in Pathology and epidemiology of nasopulmonary acariasis (Halarachne sp.) in southern sea otters (Enhydra lutris nereis)
Fig. 1. Nasopulmonary acariasis in southern sea otters (Enhydra lutris nereis). A. A single hexapod larval nasal mite (Halarachne sp.) has wandered out of the nose and is present on the planum nasale (arrow). This highly motile infectious larval stage is most common in the nares and rostral turbinates of the upper respiratory tract (Bar = 6 mm). Inset: Rhinoscopic view of a mass of hexapod larval mites (Halarachne sp.) crawling on the nasal turbinates of a sedated, live, captive sea otter (Bar = 2.5 mm). Image courtesy of Dr Michael Murray, Monterey Bay Aquarium. B. The larger, elongated (cigar-shaped) Halarachne sp. adults typically aggregate in the nasopharynx, but can also be found in the oropharynx, trachea and bronchi. Adult mites can become very densely packed in the nasopharynx, as shown here (Bar = 3 mm). C. The planum nasale was removed during necropsy, exposing the nasal cartilage and turbinate bones. As refrigerated carcasses warm up, larval mites often exit the nasal cavity and are readily apparent (arrows). This is a moderate infestation. Note the symmetry of the nasal cartilage and underlying turbinates (Bar = 12 mm). D. Severe larval mite infestation in a captive sea otter with chronic or recurrent nasopulmonary mite infestation, demonstrating marked asymmetry of the nasal cartilage and underlying turbinates. Severe, diffuse mucosal inflammation and turbinate osteolysis were confirmed on histopathology (Bar = 12 mm). E. Sea otter with a heavy intensity of adult Halarachne sp. attached to the dorsal soft palate in the nasopharynx, and throughout the larynx. Marked, diffuse mucosal erythema is spatially-associated with areas of mite attachment. Preliminary findings from bacterial culture and histopathology suggest that opportunistic bacterial pathogens, such as beta hemolytic streptococci, are often associated with these regions of mite infestation and respiratory mucosal erythema (Bar = 8 mm).
Fig. 5 in A new dracunculus species (Nematoda: Dracunculoidea) in neotropical otters (Lontra longicaudis) from Argentina: morphological and molecular characterization
Fig. 5. Maximum-likelihood trees constructed from (a) 18S rRNA and (b) COI sequences of Dracunculus jaguape n. sp. from Lontra longicaudis in Argentina compared with available sequences. Best-fitting substitution models using the Maximum-Likelihood model test were determined with the Akaike Information Criterion. Kimura 2-parameter was selected as the best model for 18S rRNA and Tamura-Nei with a discrete Gamma distribution was selected as the best model for COI. Numbers represent bootstrap support generated from 1000 replications. GenBank accession numbers are shown. Boldface indicates the strain identified in this study. Scale bars indicate nucleotide substitutions/site.
Fig. 4. Dracunculus jaguape n in A new dracunculus species (Nematoda: Dracunculoidea) in neotropical otters (Lontra longicaudis) from Argentina: morphological and molecular characterization
Fig. 4. Dracunculus jaguape n. sp. (a) Cephalic extremity of a male, lateral view. (b) Male tail, lateral view showing the spicules, and papillae. (c) Schematic male tail in ventral view. (d) Detailed of the spicule. (e) Detail of the gubernaculum.
Fig. 3. Dracunculus jaguape n in A new dracunculus species (Nematoda: Dracunculoidea) in neotropical otters (Lontra longicaudis) from Argentina: morphological and molecular characterization
Fig. 3. Dracunculus jaguape n. sp. (a) Anterior extremity of a male showing the oesophagus swelling, deirid and nerve ring. (b) Cephalic extremity, lateral view showing the cephalic papillae. (c) Anterior extremity of a gravid female. (d) Cephalic extremity, lateral view. (e) Detail of dorsal papillae, (f) Larvae with long and tapered tail, removed from the uterus. a: anus, d: deirid, ep: excretory pore, nr: nerv ring, s: glandular oesophagus swelling, o-i: oesophagus-intestine junction, p: papillae.
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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.