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38 results for “climate oscillations”
North Atlantic Oscillation (NAO) climate index hidden in ocean generated secondary microseisms
<p>Datatsets associated with "North Atlantic Oscillation (NAO) climate index hidden in ocean generated secondary microseisms". The data include the daily seismic cross-correlograms for station pairs located on land and at the seafloor offshore Ireland, 3D models used for the numerical simulations and the associated synthetic seismic data.</p>
Centennial scale climate oscillations from southern Siberia in the Last Glacial Maximum
<p>A lack of adequate high resolution climate proxy records for the Last Glacial Maximum (LGM) has prevented the extrapolation of climate–solar linkages on centennial time scales prior of the Holocene. Therefore, it is still unknown whether centennial climate variations of the last ten thousand years convey a universal climate change or merely represent a characteristic of the Holocene. Recently published high resolution climate proxy records for the LGM allowed us to extrapolate climate–solar linkages on centennial time scales ahead of the Holocene. Here we present the analysis of a high resolution pollen concentration record from Lake Kotokel in southern Siberia, Russia, during the LGM. The record reflects the dynamics of vegetation zones and temperature change with a resolution of ~ 40 years in the continental climate of north-eastern Asia. We demonstrate that our pollen concentration record, the oxygen isotope δ<sup>18</sup>O record from the Greenland ice core project NGRIP (NorthGRIP), the dust-fall contributions in Lake Qinghai, China, grain size in the Gulang and Jingyuan loess deposits, China, and the composite oxygen isotope δ<sup>18</sup>O record from the Alpine cave system 7H reveal cooler to warmer climate fluctuations between ~ 20.6 and 26 ka. Such fluctuations correspond to the ~ 1000-yr, 500-600-yr and 210-250-yr cycles possibly linked to the solar activity variations and recognized in high resolution Holocene proxies all over the world. We further show that climate fluctuations in the LGM and Holocene are spectrally similar suggesting that linkages between climate proxies and solar activity at the centennial time scale in the Holocene can be extended to the LGM.</p>
500-year periodic vegetation and monsoonal climate oscillations during the last deglaciation in East Asia
<p>1 Core Xiaolongwan description</p> <p>2 Age-depth models</p> <p>3 Pollen counts</p> <p>4 Pollen concentration</p> <p>5 Pollen percentage</p> <p>6 HHT Betula</p> <p>7 HHT Boreal Conifer with Herb</p> <p>8 HHT Artemisia</p> <p>9 HHT Broadleaved Tree</p> <p>10 Long chain <em>n</em>-alkanes δ<sup>13</sup>C</p>
Climatic adaptation explains responses to Pleistocene oscillations and diversification in European vipers
<p>Table with the occurrence data at 10 min resolution (~20x20 km) for 24 lineages of the genus <em>Vipera, </em>used in "Climatic adaptation explains responses to Pleistocene oscillations and diversification in European vipers".</p>
Data from: Climate oscillation and alien species invasion influences oceanic seabird distribution
Spatial and temporal distribution of seabird transiting and foraging at sea is an important consideration for marine conservation planning. Using at-sea observations of seabirds (n = 317), collected during the breeding season from 2012 to 2016, we built boosted regression tree (BRT) models to identify relationships between numerically dominant seabird species (red-footed booby, brown noddy, white tern and wedge-tailed shearwater), geomorphology, oceanographic variability, and climate oscillation in the Chagos Archipelago. We documented positive relationships between red-footed booby and wedge-tailed shearwater abundance with the strength in the Indian Ocean Dipole, as represented by the Dipole Mode Index (6.7% and 23.7% contribution respectively). The abundance of red-footed boobies, brown noddies and white terns declined abruptly with greater distance to island (17.6%, 34.1% and 41.1% contribution respectively). We further quantified the effects of proximity to rat-free and rat-invaded islands on seabird distribution at sea, and identify breaking point distribution thresholds. We identified areas of increased abundance at sea and habitat use-age under a scenario where rats are eradicated from invaded nearby islands and recolonised by seabirds. Following rat eradication, abundance at sea of red-footed booby, brown noddy, and white terns increased by 14%, 17% and 3% respectively, with no important increase detected for shearwaters. Our results have implication for seabird conservation and island restoration. Climate oscillations may cause shifts in seabird distribution, possibly through changes in regional productivity and prey distribution. Invasive species eradications and subsequent island recolonization can lead to greater access for seabirds to areas at-sea, due to increased foraging or transiting through, potentially leading to distribution gains and increased competition. Our approach predicting distribution after successful eradications enables anticipatory threat-mitigation in these areas, minimising competition between colonies and thereby maximising the risk of success and the conservation impact of eradication programmes.
Atlantic Ocean marlin fishery and climatic oscillations dataset
<p>Climatic oscillations affect fish population dynamics, ecological processes, and fishing operations in maritime habitats. This study examined how climatic oscillations affect catch rates for striped, blue, and silver marlins in the Atlantic Ocean. These oscillations are regarded as the primary factor influencing the abundance and accessibility of specific resources utilized by fishers. Logbook data were obtained from Taiwanese large-scale fishing vessels for climatic oscillations during the period 2005–2016. The results indicated that the effect of the Subtropical Indian Ocean Dipole on marlin catch rates did not have a lag, whereas those of the North Atlantic Oscillation, Atlantic Multidecadal Oscillation, Pacific Decadal Oscillation, and Indian Ocean Dipole had various lags. Pearson's correlation analysis was conducted to examine the correlations between atmospheric oscillation indices and marlin catch rates, and wavelet analysis was employed to describe the influences of the most relevant lags. The results indicated that annual atmospheric fluctuations and their lags affected the abundance and catchability of striped, blue, and silver marlins in the study region. This, in turn, may affect the presence of these species in the market and lead to fluctuations in their prices in accordance with supply and demand. Overall, understanding the effects of climatic oscillations on fish species are essential for policymakers and coastal communities seeking to manage marine resources, predict changes in marine ecosystems, and establish appropriate methods for controlling the effects of climate variability.</p>
Data for: Climatic oscillation promoted diversification of spinous assassin bugs during Pleistocene glaciation
<p>Insect speciation is among the most fascinating topics in evolutionary biology; however, its underlying mechanisms remain unclear. Allopatric speciation represents one of the major types of speciation and is believed to have frequently occurred during glaciation periods, when climatic oscillation may have caused suitable habitats to be fragmented repeatedly, creating geographical isolation among populations. However, supporting evidence for allopatric speciation of insects in East Asia during the Pleistocene glaciation remains lacking. We aim to investigate the effect of climatic oscillation during the Pleistocene glaciation on the diversification pattern and evolutionary history of hemipteran insects and to test the hypothesis of Pleistocene species stability using spinous assassin bugs <em>Sclomina</em> (Hemiptera: <span>Reduviidae</span>), a small genus widely distributed in southern China but was lately found to have cryptic species diversity. Here, using the whole mitochondrial genome (mitogenome) and nuclear ribosomal RNA genes, we investigated both interspecific and intraspecific diversification patterns of spinous assassin bugs. Approximate Bayesian computation, ecological niche modeling and demographic history analyses were also applied to understand the diversification process and driven factors. Our data suggest that the five species of <em>Sclomina</em> are highly diverged, despite three of them currently being cryptic. Speciation occurred during Pleistocene when suitable distribution areas were possibly fragmentated. Six phylogeographic groups in the type species <em>S. erinacea</em> were identified, among which two groups underwent expansion during early Last Glacial Period and after Last Glacier Maximum. Our analyses suggest that this genus may have experienced climate-driven habitat fragmentation and post-glacial expansion in the Pleistocene, promoting allopatric speciation and intraspecific diversification. Our results reveal underestimated species diversity in a small insect group and illustrate a remarkable example of allopatric speciation of insects in East Asia promoted by Pleistocene climatic oscillations. These findings provide important insights into the speciation processes and aid the conservation of insect species diversity.</p>
Data for: Climatic oscillation promoted diversification of spinous assassin bugs during Pleistocene glaciation
Open the record for dataset details and reuse information.
Atlantic Ocean marlin fishery and climatic oscillations dataset
Open the record for dataset details and reuse information.
Data from: Climate oscillation and alien species invasion influences oceanic seabird distribution
Open the record for dataset details and reuse information.
Global diversification of Anelosimus spiders driven by long distance overwater dispersal and Neogene climate oscillations
Vicariance and dispersal events, combined with intricate global climatic history, have left an imprint on the spatiotemporal distribution and diversity of many organisms. Anelosimus cobweb spiders (Theridiidae), are solitary-social organisms with a cosmopolitan distribution in temperate- to-tropical areas. Their evolutionary history and the discontinuous distribution of species richness suggest that 1) long distance overwater dispersal, and 2) climate change during the Neogene (23–2.6 Ma), may be major factors in explaining their distribution and diversification. Here we test these hypotheses, and explicitly test if global Miocene/Pliocene climatic cooling in the last 8 Ma affected Anelosimus radiation in parallel in South America and Madagascar. To do so, we investigate the phylogeny and spatiotemporal biogeography of Anelosimus through a culmination of a 20-year comprehensive global sampling at the species level (69 species, including 84% of the known 75 species worldwide, represented by 268 individuals) using nucleotide data from seven loci (5.5 kb). Our results strongly support the monophyly of Anelosimus with an Oligocene (~30 Ma) South American origin. Major clades on other continents originate via multiple, long-distance dispersal events, of solitary or subsocial—but not social—lineages, from the Americas. These intercontinental dispersals were to Africa, Madagascar (twice), and SE Asia/Australasia. The early diversification of Anelosimus spiders coincides with a sudden thermal increase in the late Oligocene (~27–25 Ma), though no causal connection can be made. Our results, however, strongly support the hypothesis that global Neogene climatic cooling in the last 8 Ma drove Anelosimus radiation in parallel in S. America and Madagascar, offering a rare empirical evidence for diversification of a socially diverse group driven by an interplay between long distance dispersal and global Neogene climatic changes.
Data for "Improved simulation of Madden–Julian Oscillation with the modified moist physical parameterizations for a global climate model"
<p>Model output data for the manuscript "Improved simulation of Madden–Julian Oscillation with the modified moist physical parameterizations for a global climate model", including convective precipitation (PRECC), large-scale precipitation (PRECL), mean SST and U850, <span>column-integrated MSE tendency anomalies, and boundary layer moisture convergence. </span></p>
Fig. 7 in Broadly Distributed but Genetically Fragmented: Demographic Consequences of Pleistocene Climatic Oscillations in a Common Iberian Grasshopper
Fig. 7. Demographic history of the studied populations of Pantel's grasshopper (Omocestus panteli) inferred using STAIRWAY PLOT. Panels show the median of effective population size (N) over time, estimated assuming a mutation rate of 2.8 × 10−9 and a 1-yr generation time (both axes in a logarithmic scale). Vertical e dashed lines indicate the Last Glacial Maximum (LGM; ca. 21 ka). Number of polymorphic SNPs used to calculate the site frequency spectrum (SFS) indicated in parentheses. Colors correspond to the main genetic cluster at which populations were predominantly assigned according to STRUCTURE analyses for K = 6 (Fig. 3). Population codes as described inTable 1.
Fig. 6 in Broadly Distributed but Genetically Fragmented: Demographic Consequences of Pleistocene Climatic Oscillations in a Common Iberian Grasshopper
Fig. 6. Relationships (A) between genetic diversity (π) and latitude and (B) between long-term effective population size (Ne) and environmental suitability during the last glacial maximum (LGM) inferred by projecting the species-specific environmental niche model (ENM) to LGM bioclimatic conditions under the CCSM4 general atmospheric circulation model.
Fig. 5 in Broadly Distributed but Genetically Fragmented: Demographic Consequences of Pleistocene Climatic Oscillations in a Common Iberian Grasshopper
Fig. 5. Relationship between genetic differentiation (FST) and resistance distances based on environmental suitability during the LGM inferred by projecting the species-specific environmental niche model (ENM) to LGM bioclimatic conditions under the CCSM4 general atmospheric circulation model.
Fig. 3 in Broadly Distributed but Genetically Fragmented: Demographic Consequences of Pleistocene Climatic Oscillations in a Common Iberian Grasshopper
Fig. 3. Results of genetic assignments for populations of the Pantel's grasshopper (Omocestus panteli) based on the Bayesian method implemented in the program STRUCTURE and a discriminant analysis of principal components (DAPC). Each individual is represented by a vertical bar, which is partitioned into K-colored segments showing the individual's probability of belonging to the cluster with that color.Thin vertical black lines separate individuals from different populations. Analyses are based on a dataset of 14,454 SNPs. Population codes as described inTable 1.
Fig. 1 in Broadly Distributed but Genetically Fragmented: Demographic Consequences of Pleistocene Climatic Oscillations in a Common Iberian Grasshopper
Fig. 1. (A) Map showing the geographical location of sampling populations of Pantel's grasshopper (Omocestus panteli), with dot colors indicating their respective levels of genetic diversity (π, in red to blue scale). Dot size is proportional to the number of genotyped individuals (Table 1). (B–D) Projections of the species-specific environmental niche model (ENM) for (B) present and (C–D) last glacial maximum (LGM) bioclimatic conditions under the (C) CCSM4 and (D) MIROC-ESM general atmospheric circulation models. Map in the present shows occurrence points (crosses) used for ENM. Population codes as described in Table 1.
Figure 4 in Effects of Quaternary climatic oscillations over the Chacoan fauna: phylogeographic patterns in the southern three-banded armadillo Tolypeutes matacus (Cingulata: Chlamyphoridae)
Figure 4. Effective size change over time estimated from BSP analysis corresponding to all the localities for each marker. The y-axis represents the effective size (Ne) expressed on a logarithmic scale. The x-axis represents time in millions of years (Myr) before the present. The dark blue lines represent the median effective population size over time, and the lighter blue areas the range of Ne values with posterior densities higher than 95%. Expansion signals were highlighted in yellow. The analyses for the northern and southern groups are shown in the Supporting Information, Figure S1.
Figure 3 in Effects of Quaternary climatic oscillations over the Chacoan fauna: phylogeographic patterns in the southern three-banded armadillo Tolypeutes matacus (Cingulata: Chlamyphoridae)
Figure 3. Left panel (A) shows groups recovered by Bayesian inference in GENELAND. The middle and right panels present spatial distribution of posterior probability to belong to cluster north (B) and south (C).
Figure 2. Geographic distribution and haplotype networks for 12S in Effects of Quaternary climatic oscillations over the Chacoan fauna: phylogeographic patterns in the southern three-banded armadillo Tolypeutes matacus (Cingulata: Chlamyphoridae)
Figure 2. Geographic distribution and haplotype networks for 12S (top panels) and control region (bottom panels). The panels on the left plot the geographical distribution and frequency of haplotypes in the different localities analysed. Localities were labelled according to their ID (see Table 1). The right panels show the haplotype networks, where the dashes on the lines represent mutations, and the black circles represent intermediate variants not found. Principal Chacoan rivers are shown in light-blue labels. Capitalized labels indicate names of Argentinean provinces, and labels with all letters in uppercase refer to neighbouring countries.
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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.