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201 results for “cetaceans”
Fig. 2 in Opportunistic Observations On The Distribution Of Cetaceans In The Malaysian South China, Sulu And Sulawesi Seas And An Updated Checklist Of Marine Mammals In Malaysia
Fig. 2. Map showing the locations of live sightings and strandings of various cetacean species in Peninsular Malaysia as listed in the updated checklist in Table 3. Each species' code on the map is according to the two-letter abbreviations listed in Table 3.
Fig. 1 in Opportunistic Observations On The Distribution Of Cetaceans In The Malaysian South China, Sulu And Sulawesi Seas And An Updated Checklist Of Marine Mammals In Malaysia
Fig. 1. Map showing the transect lines on which cetacean observations were conducted as well as the sightings of cetaceans that were encountered during the 2009 Prime Scientific Sailing Expedition.
Soundscape and small cetacean sounds. Puerto Cisnes May 2021.
<p>Audio files recorded in Puyuhuapi sound, close to the city of Puerto Cisnes, Region de Aysen, Chile, from May, 04th 2021 to May, 06th 2021 .</p> <p>The files with more than 300 detected clicks of small NBHF cetaceans have been uploaded. The cetacean are probably Chilean dolphins (Cephalorhynchus eutropia), but possibly also Peale’s dolphins (Lagenorhynchus australis) or Burmeister’s porpoise (Phocoena spinipinnis).</p> <p>Instrument is QHB Recorder from Smiot, Université de Toulon (http://bioacoustics.lis-lab.fr/smiot), set with sample rate of 512 Ksps, sampling depth of 16 bits, and C57 Cetacean Research hydrophone.</p> <p>The whole dataset, too large to be included in Zenodo repository, can be found on the following adress : http://sabiod.lis-lab.fr/pub/CHILI/PUERTO_CISNES_2021/ .</p>
Cetacean sightings, n T.t.ponticus 59 45 22 4 2 3 1 2 0 0 4 1 June July August September Fig. 4. Sightings per month for each species. in Vantage point surveys of cetaceans (Mammalia, Cetacea) and their interactions with marine birds
Cetacean sightings, n T.t.ponticus 59 45 22 4 2 3 1 2 0 0 4 1 June July August September Fig. 4. Sightings per month for each species.
Fig. 1 in Vantage point surveys of cetaceans (Mammalia, Cetacea) and their interactions with marine birds
Fig. 1. Cetacean sightings at Cape Emine (white dot) between June-September, 2021 (blue – T. t. ponticus, green – P. p. relicta, red – D. d. ponticus, yellow - vantage - point).
Fig. 2. Feeding activity during the 2021 in Vantage point surveys of cetaceans (Mammalia, Cetacea) and their interactions with marine birds
Fig. 2. Feeding activity during the 2021 observations at Cape Emine - white dot; blue – T. t. ponticus, green – P. p. relicta, red – D. d. ponticus, yellow - vantage - point.
Now or Never? Global Review of Reactive and Near Real-Time Conservation Actions For Cetaceans
<p><span>Table S1: Information on resulting publications (<em>n</em> = 64) reviewed in this study.</span></p>
Data from: Convergence and constraint in the cranial evolution of mosasaurid reptiles and early cetaceans
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Directional hydrophone clusters reveal evasive responses of small cetaceans to disturbance at offshore windfarms
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Recordings from: Evaluation of a coastal acoustic buoy for cetacean detections, bearing accuracy, and exclusion zone monitoring
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Online Appendix and Cetacean Datasets for: The Occurrence Birth-Death Process for combined-evidence analysis in macroevolution and epidemiology
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Morphological diversity of the cetacean mandibular symphysis coincides with novel modes of aquatic feeding
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Positive selection and inactivation in vision and hearing genes of cetaceans
<p>The transition to an aquatic lifestyle in cetaceans (whales and dolphins) resulted in a radical transformation in their sensory systems. Toothed whales acquired specialized high-frequency hearing tied to the evolution of echolocation, while baleen whales evolved low-frequency hearing. More generally, all cetaceans show adaptations for hearing and seeing underwater. To determine the extent to which these phenotypic changes have been driven by molecular adaptation, we performed large-scale targeted sequence capture of 179 sensory genes across the Cetacea, incorporating up to 54 cetacean species from all major clades as well as their closest relatives, the hippopotamuses. We screened for positive selection in 167 loci related to vision and hearing, and found that the diversification of cetaceans has been accompanied by pervasive molecular adaptations in both sets of genes, including several loci implicated in non-syndromic hearing loss (NSHL). Despite these findings, however, we found no direct evidence of positive selection at the base of odontocetes coinciding with the origin of echolocation, as found in studies examining fewer taxa. By using contingency tables incorporating taxon- and gene-based controls, we show that, while numbers of positively selected hearing and NSHL genes are disproportionately high in cetaceans, counts of vision genes do not differ significantly from expected values. Alongside these adaptive changes, we find increased evidence of pseudogenization of genes involved in cone-mediated vision in mysticetes and deep diving odontocetes. </p>
Data from: Mapping of cetacean and seabird populations in the North-East Atlantic
<p>1. Distribution maps of cetaceans and seabirds at basin and monthly scales are needed for conservation and marine management. These are usually created from standardised and systematic aerial and vessel surveys, with recorded animal densities interpolated across study areas. However, as individual surveys have restricted spatial and temporal coverage, distribution maps at basin and monthly scales have previously not been possible. <br> 2. This study develops an alternative approach consisting of: (1) collating diverse survey data to maximise spatial and temporal coverage, (2) using detection functions to estimate variation in the surface area covered (km2) among these surveys, standardising measurements of effort and animal densities, (3) developing species distribution models (SDM) that overcome issues with heterogeneous and uneven coverage. <br> 3. 2.68 million km of survey data in the North-East Atlantic between 1980 and 2018 were collated and standardised. SDM using Generalized Linear Models (GLM) and General Estimating Equations (GEE) in a hurdle-model were developed. Distribution maps were then created for 12 cetacean and 12 seabird species at 10 km and monthly resolution. Qualitative and quantitative assessment indicated good model performance. <br> 4. Applications and synthesis: This study provides the largest ever collation and standardisation of diverse survey data for cetaceans and seabirds, and the most comprehensive distribution maps of these taxa in the North-East Atlantic. These distribution maps have numerous applications including the identification of important areas needing protection, and the quantification of overlap between vulnerable species and anthropogenic activities. This study demonstrates how the analysis of existing and diverse survey data can meet conservation and marine management needs.</p>
Data from: Assessing cetacean populations using integrated population models: an example with Cook Inlet beluga whales
<p>Effective conservation and management of animal populations requires knowledge of abundance and trends. For many species, these quantities are estimated using systematic visual surveys. Additional individual-level data are available for some species. Integrated population modelling (IPM) offers a mechanism for leveraging these datasets into a single estimation framework. IPMs that incorporate both population- and individual-level data have previously been developed for birds, but have rarely been applied to cetaceans. Here, we explore how IPMs can be used to improve the assessment of cetacean populations. We combined three types of data that are typically available for cetaceans of conservation concern: population-level visual survey data, individual-level capture-recapture data, and data on anthropogenic mortality. We used this IPM to estimate the population dynamics of the Cook Inlet population of beluga whales (CIBW; <i>Delphinapterus leucas</i>) as a case study. Our state-space IPM included a population process model and three observational submodels: 1) a group detection model to describe group size estimates from aerial survey data; 2) a capture-recapture model to describe individual photographic capture-recapture data; and 3) a Poisson regression model to describe historical hunting data. The IPM produces biologically plausible estimates of population trajectories consistent with all three datasets. The estimated population growth rate since 2000 is less than expected for a recovering population. The estimated juvenile/adult survival rate is also low compared to other cetacean populations, indicating that low survival may be impeding recovery. This work demonstrates the value of integrating various data sources to assess cetacean populations and serves as an example of how multiple, imperfect datasets can be combined to improve our understanding of a population of interest. The model framework is applicable to other cetacean populations and to other taxa for which similar data types are available.</p>
Cetacean? Tooth Block - quick scan for reference
A concretion containing a number of possibly cetacean teeth. The line on top is 5cm. Source: Objaverse 1.0 / Sketchfab
Cetacean & environmental data collected on Iveragh during LIVE Project (2020-2022)
<p>The data sets consists of cetacean data (sightings and strandings) collected during the LIVE Project, on the Iveragh peninsula, Co. Kerry, Ireland.</p> <p>These include land-based effort watches (October 2021 - September 2022), boat effort surveys (summer 2022), casual sightings reported through LIVE researcher (2020-2022) and data obtained from the Irish Whale and Dolphin Group website (2020-2022).</p> <p>Tidal data from Dingle Harbour and environmental parameters recorded through Buoy M3 are also available here.</p>
Fig. 1 in Distribution Of Small Cetaceans In The Nearshore Waters Of Sarawak, East Malaysia
Fig. 1. Three main study areas in Sarawak.
A pan-cetacean MHC amplicon sequencing panel developed and evaluated in combination with genome assemblies
<p>The major histocompatibility complex (MHC) is a highly polymorphic gene family that is crucial in immunity, and its diversity can be effectively used as a fitness marker for populations. Despite this, MHC remains poorly characterised in non-model species (e.g., cetaceans: whales, dolphins and porpoises) as high gene copy number variation, especially in the fast-evolving class I region, makes analyses of genomic sequences difficult. To date, only small sections of class I and IIa genes have been used to assess functional diversity in cetacean populations. Here, we undertook a systematic characterisation of the MHC class I and IIa regions in available cetacean genomes. We extracted full-length gene sequences to design pan-cetacean primers that amplified the complete exon2 from MHC class I and IIa genes in one combined sequencing panel. We validated this panel in 19 cetacean species and described 354 alleles for both classes. Furthermore, we identified likely assembly artefacts for many MHC class I assemblies based on the presence of class I genes in the amplicon data compared to missing genes from genomes. Finally, we investigated MHC diversity using the panel in 25 humpback and 30 southern right whales, including four paternity trios for humpback whales. This revealed copy-number variable class I haplotypes in humpback whales, which is likely a common phenomenon across cetaceans. These MHC alleles will form the basis for a cetacean branch of the Immuno-Polymorphism Database (IPD-MHC), a curated resource intended to aid in the systematic compilation of MHC alleles across several species, to support conservation initiatives.</p>
A matter of scale: Identifying the best spatial and temporal scale of environmental variables to model the distribution of a small cetacean
<p>The importance of scale when investigating ecological patterns and processes is recognised across many species. In marine ecosystems, the processes that drive species distribution have a hierarchical structure over multiple nested spatial and temporal scales. Hence, multi-scale approaches should be considered when developing accurate distribution models to identify key habitats, particularly for populations of conservation concern. Here, we propose a modelling procedure to identify the best spatial and temporal scale for each modelled and remotely sensed oceanographic variable to model harbour porpoise (<em>Phocoena phocoena</em>) distribution. Harbour porpoise sightings were recorded during dedicated line-transect aerial surveys conducted in the summer of 2016, 2021 and 2022 in the Northeast Atlantic. Binary generalised additive models were used to assess the relationships between porpoise presence and oceanographic variables at different spatial (5, 20 and 40 km) and temporal (daily, monthly and across survey period) scales. Selected variables included sea surface temperature, thermal fronts, chlorophyll-a, sea surface height, mixed layer depth and salinity. A total of 30,514 km was covered on-effort with 216 harbour porpoise sightings recorded. Overall, the best spatial scale corresponded to the coarsest resolution considered in this study (40 km), while porpoise presence showed stronger association with oceanographic variables summarised at a longer temporal scale (monthly and averaged over survey period). Habitat models including covariates at coarse spatial and temporal scales may better reflect the processes driving availability and abundance of prey resources at the large scales covered during the surveys. These findings support the hypothesis that a multi-scale approach should be applied when investigating species distribution. Identifying suitable spatial and temporal scale would improve the functional interpretation of the underlying relationships, particularly when studying how a small marine predator interacts with its environment and responds to climate and ecosystem changes. </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.