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149 results for “species connectivity”
The effectiveness of freshwater connectivity as a predictor of species distribution
<p>The attached dataset contains three dataframes used in the affiliated papers.</p> <p>1) DirectSlopeData.rda - Recolonisation success of two species, northern pike and European perch, in rotenone-treated lakes in Sweden, alongside connectivity parameters for the associated lakes.</p> <p>2) HPD.rda - Credible intervals for the beta estimates generated by the BORAL model in 3.</p> <p>3) Presence/absence data for seven species in lakes throughout the Kautokeino catchment in Northern Norway, alongside selected environmental covariates for associated lakes.</p>
Fig. 1 in Invasive Mollusc, Crustacean, Fish And Reptile Species Along The Hungarian Stretch Of The River Danube And Some Connected Waters
Fig. 1. Increasing number of invasive species in the Hungarian Danube stretch according to the studied taxonomical groups
The genetic structure and connectivity in two sympatric rodent species with different life histories are similarly affected by land use disturbances
<p><strong>Microsatellite dataset of the wood mouse (<em>Apodemus sylvaticus)</em> and the bank vole (<em>Myodes glareolus).</em></strong></p> <p>The dataset of the wood mouse is constituted of 194 samples and 7 microsatellite markers: WM_194ind_7STRs.txt</p> <p>The dataset of the bank vole is constituted of 199 samples and 8 microsatellite markers: BV_199ind_8STRs.txt</p> <p>Each locus is encoded in the three-digit format (e.g., 126126) and each column corresponds to a locus specified in the order at the beginning of the file, following the GENEPOP format.</p> <p>Pop indicates the beginning of a new location.</p> <p> </p> <p><em><strong>Locus name in WM_194ind_7STRs.txt</strong></em></p> <p>Locus_1 AS-7-FAM<br> Locus_2 AS-12-PET<br> Locus_3 AS-20-NED<br> Locus_4 AS-34-FAM<br> Locus_5 GTTD9A-PET<br> Locus_6 AS-11-VIC<br> Locus_7 MS-AF-8-NED</p> <p> </p> <p><em><strong>Locus name in BV_199ind_8STRs.txt</strong></em></p> <p>Locus_1 Cg13B8-F_FAM<br> Locus_2 Cg6A1-F_VIC<br> Locus_3 Cg3F12-F_PET<br> Locus_4 Cg13H9-F_PET<br> Locus_5 Cg2E2-F_VIC<br> Locus_6 Cg3E10-F_FAM<br> Locus_7 Cg2A4-F_FAM<br> Locus_8 Cg3A8-F_NED</p>
Text-fig. 1. Localities of investigated species. Black dots represent places where forms were found. 1 – Hirzhevo, 2 – Myrne, in The Ultrastructure Of The Tooth Enamel Of Small Equus Of The "Tarpan" Group And Their Possible Phylogenetic Connections
Text-fig. 1. Localities of investigated species. Black dots represent places where forms were found. 1 – Hirzhevo, 2 – Myrne,
Text-fig. 3. Tendency of changes in IPM and PE width indicators in different types of enamel of the Equidae species of the "tarpan" group. I–III – types of enamel. a: IPM; b: PE. in The Ultrastructure Of The Tooth Enamel Of Small Equus Of The "Tarpan" Group And Their Possible Phylogenetic Connections
Text-fig. 3. Tendency of changes in IPM and PE width indicators in different types of enamel of the Equidae species of the "tarpan" group. I–III – types of enamel. a: IPM; b: PE.
Figure 7-11. Syndesus ambericus Woodruff, n in A new fossil species of stag beetle from Dominican Republic amber, with Australasian connections (Coleoptera: Lucanidae)
Figure 7-11. Syndesus ambericus Woodruff, n. sp. 7) Antennal club (note 7 lamellae in club). 8) Lateral view, habitus; note fractures in 2009. 9) Enlargement of elytral punctures, right side. 10) Enlargement of pronotum; note dense, coarse punctures. 11) "Minute black scavenger fly" (Scatopsidae), located 5mm away from the Syndesus ambericus holotype. 12) Right lateral view of head and pronotum; note mandibles and palpi.
Figure 1-6. Syndesus spp. 1, 2, 5, 6 in A new fossil species of stag beetle from Dominican Republic amber, with Australasian connections (Coleoptera: Lucanidae)
Figure 1-6. Syndesus spp. 1, 2, 5, 6: Syndesus cornutus (Fab.). 1) Left lateral view of head and pronotum (note prominent mandibles and palpi). 2) Enlargement of eye and antenna (note 7 lamellae in club). 5) Habitus, lateral. 6) Habitus, dorsal. 3-4: Syndesus ambericus Woodruff, n. sp. 3) Amber fossil; habitus lateral in 1983. 4) Enlargement of right mandible (note 3 "teeth").
Figure 1 in Taxonomic affinities of three stalked colonial species of the Ascidiacea (Tunicata) from the central coast of New South Wales and indications of a trans-Tasman connection
Figure 1. Euclavella claviformis (QM G308883): (A) colony; (B) developmental sequence of embryos in the distal part of the oviduct forming a collar around the top of the oesophageal neck. Hypsistozoa distomoides (QM G308880): (C) colony; (D) zooid; (E) zooid (with denticles on the atrial lip); (F) larva (left side with ectotrophic membranes pulled away from the trunk); (G) larva (with ectotrophic membranes intact); (H) larva (right side with ectotrophic membranes pulled away from the trunk). Scale bars: A, B, 10 mm; C–G, 0.2 mm.
Figure 2 in Taxonomic affinities of three stalked colonial species of the Ascidiacea (Tunicata) from the central coast of New South Wales and indications of a trans-Tasman connection
Figure 2. Hypsistozoa distomoides (QM G308880) postero-dorsal vertical section of larval trunk (semidiagramatic): e, endodermal tube; nc, nerve cord; o, section through oesophagus; ec, ectotrophic membrane; s, stomach wall; oe, oesophagus; h, haemocoele; le, larval ectoderm; n, notochord; r, rectum. Scale bar, 0.1 mm.
Figure 3 in Taxonomic affinities of three stalked colonial species of the Ascidiacea (Tunicata) from the central coast of New South Wales and indications of a trans-Tasman connection
Figure 3. In situ colour images: (A) Euclavella claviformis; (B) Hypsistozoa distomoides colony lying flat on the sea floor at low slack tide; (C) Sigillina cyanea from high-energy location, showing tip of colony worn by abrasion on sea floor sediments. The possibly commensal nudibranch Nembrotha sp. is associated with the colony.
Data and code from: River network connectivity reductions dominate declines in the richness of plateau fish species under climate change in the upper Yangtze River Basin
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Data and code from: Determinants of species’ centrality in spatially-connected plant-frugivore networks
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Data from: A landscape genetics approach reveals species-specific connectivity patterns for stream insects in fragmented habitats
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Effects of Hydrologic Connectivity and Species Differences on Riparian Poplar Growth (Rhône River, France)
Understanding how ecosystems will respond to the projected increase in drought conditions is a key factor in the larger debate on how to combat climate change. This is especially important for ecosystems intrinsically linked to the hydro system, such as riparian zones. We performed a dendrochronological analysis using the basal area increment of Populus alba and Populus nigra along the Rhône River in Brégnier-Cordon (France) to investigate how the two species respond to water stress. Samples were taken from sites of varying connectedness to the water table in order to simulate different drought conditions. Our goal was to understand if one of the species was more drought resistant, and therefore better adapted to survive declining groundwater levels. Results show that there is a significant correlation between annual growth and the species and site connectiveness to the water table. Not only was growth correlated to both variables separately, but there was significant correlation between growth and the interaction between the two. Our results indicate that the ecosystem structure regarding P. alba and P. nigra along this portion of the Rhône will change as drought conditions worsen as the species are affected significantly differently by water stress.
Copulatory openings large (c3), connected by transverse groove (c4) in An of Zelotibia (Araneae, Gnaphosidae), a spider genus with a species swarm in the Albertine Rift
Copulatory openings large (c3), connected by transverse groove (c4)
New species boundaries and the diversification history of marsh rat taxa clarify historical connections among ecologically and geographically distinct wetlands of South America
<p><span><span><span><span><span><span><span><span><span><span><span>Taxa with broad geographic ranges that occur in different biomes and exhibit plastic morphological traits and/or adaptations to particular habitats make inferences about species boundaries especially challenging. However, technological and conceptual advances in the generation and analysis of genomic data have advanced the description of biodiversity. Here we address the outstanding questions about the delimitation of species in the genus <i>Holochilus, </i>a rodent with morphological specializations to wetland habitats, distributed through almost all the South America continent using genome‐wide SNP and morphometric data. Specifically, we apply a Bayesian model‐based species delimitation that revealed significant re-arrangements of species boundaries based on consideration of both morphometric and genomic data alone, or in combination. With these shifts in species boundaries, our results provide an insightful framework for inferring the group's biogeographic history and considering possible connections between disjoint biomes in South America. Because of the ecological constraints of the marsh rats, and with the proposed taxonomic re-arrangements, the significance of our findings extends beyond systematics and suggests how diversification might be associated with past ecological/environmental changes during the Pleistocene. Overall, this study highlights how genomic data can provide phylogenetic information for resolving relationships among species of <i>Holochilus</i>, but also the importance of integrative approaches to identify evolutionary independent species. For the relatively understudied vast wetlands of South America, a robust species delimitation framework therefore becomes a critical source of data relevant to hypotheses about the history of the biomes themselves.</span></span></span></span></span></span></span></span></span></span></span></p>
Network analyses reveal the role of large snakes in connecting feeding guilds in a species-rich Amazonian snake community
<p class="normal">In ecological communities, interactions between consumers and resources lead to the emergence of ecological networks and a fundamental problem to solve is to understand which factors shape network structure. Empirical and theoretical studies on ecological networks suggest predator body size is a key factor structuring patterns of interaction. Because larger predators consume a wider resource range, including the prey consumed by smaller predators, we hypothesized that variation in body size favors the rise of nestedness. In contrast, if resource consumption requires specific adaptations, predators are expected to consume distinct sets of resources, thus favoring modularity. We investigate these predictions by characterising the trophic network of a species-rich Amazonian snake community (62 species). Our results revealed an intricate network pattern resulting from larger species feeding on higher diversity of prey, promoting nestedness, and specific lifestyles feeding on distinct resources, promoting modularity. Species removal simulations indicated that the nested structure is favored mainly by the presence of five species of the family Boidae, which because of their body size and generalist lifestyles connect modules in the network. Our study highlights the particular ways traits affect the structure of interactions among consumers and resources at the community level.</p>
Landscape connectivity and genetic structure in a mainstem and a tributary stonefly (Plecoptera) species using a novel reference genome
<p>Abstract Understanding how environmental variation influences population genetic structure can help predict how environmental change influences population connectivity, genetic diversity, and evolutionary potential. We used riverscape genomics modelling to investigate how climatic and habitat variables relate to patterns of genetic variation in two stonefly species, one from mainstem river habitats (Sweltsa coloradensis) and one from tributaries (Sweltsa fidelis) in 40 sites in northwest Montana, USA. We produced a draft genome assembly for S. coloradensis (N50 = 0.251 Mbp, BUSCO &gt; 95% using "insecta_ob9" reference genes). We genotyped 1930 SNPs in 372 individuals for S. coloradensis and 520 SNPs in 153 individuals for S. fidelis. We found higher genetic diversity for S. coloradensis compared to S. fidelis, but nearly identical genetic differentiation among sites within each species (both had global loci median FST = 0.000), despite differences in stream network location. For landscape genomics and testing for selection, we produced a less stringently filtered data set (3454 and 1070 SNPs for S. coloradensis and S. fidelis, respectively). Environmental variables (mean summer precipitation, slope, aspect, mean June stream temperature, land cover type) were correlated with 19 putative adaptive loci for S. coloradensis. but there was only one putative adaptive locus for S. fidelis (correlated with aspect). Interestingly, we also detected potential hybridization between multiple Sweltsa species which has never been previously detected. Studies like ours, that test for adaptive variation in multiple related species are needed to help assess landscape connectivity and the vulnerability of populations and communities to environmental change.</p>
Phylogeographical break and limited connectivity between multiple refugia in panantarctic moss species
<p><span><strong>Aim</strong>:</span><span> Historical biogeography of the Antarctic terrestrial biota remains poorly studied and understood. We aim to advance this through a range-wide, multilocus analysis of a pan-Antarctic moss species, in the context of its age, range dynamics, phylogeographical structure, and location of possible long-term refugia. </span></p> <p><span><strong>Location</strong>:</span><span> Continental and maritime Antarctic, South America (Patagonia), Australasia.</span></p> <p><span><strong>Taxon</strong>:</span><span> <em>Syntrichia sarconeurum</em> Ochyra & R.H. Zander (Pottiaceae).</span></p> <p><span><strong>Methods</strong>:</span><span> We used a comprehensive, range-wide and taxonomically-informed sampling, and multilocus sequencing of nuclear and plastid DNA regions. Temporal evolutionary framework, regional genetic diversification and diversity were assessed with phylogenetic and phylogeographic reconstructions, molecular dating, haplotype networks, mismatch analysis, and S-DIVA reconstruction of past events and ancestral areas.</span></p> <p><span><strong>Results</strong>:</span><span> Intercontinental disjunction between Australia and Antarctica/S. America was dated to 3.77 Ma, while diversification of extant <em>Syntrichia sarconeurum</em> lineages had taken place since roughly 1.36 Ma. Antarctic populations contained two high-frequency, allopatric cpDNA haplotypes, which highlighted separation of the continental populations. <em>ITS</em> data showed higher diversification and revealed three main lineages with a main genetic break mostly concordant with plastid data. <em>ITS</em> also showed contrasting diversity between the Antarctic continent and maritime Antarctic/Patagonia.</span></p> <p><span><strong>Main conclusions</strong>:</span><span> Age of the Antarctic range of <em>Syntrichia sarconeurum</em> potentially reaches back to mid-Pliocene, while diversification of extant genetic lineages was linked with recurrent macroenvironmental changes of the Pleistocene. Significant phylogeographical structure displays a major genetic break, which coincides with a known boundary in the terrestrial biota and suggests constrained population connectivity. <em>S. sarconeurum</em> persisted <em>in situ</em> over several glacial periods in refugia both in the peripheral maritime Antarctic and within the Antarctic continent. Disparity in genetic diversity among these areas hypothetically reflects asymmetric changes of reproduction mode in the past. Finally, nested topology of Patagonian subclades and ancestry analysis indicates that South American populations were secondary and originated through multiple dispersal from the Antarctic region.</span></p>
A new, disjunct species of Bahiana (Euphorbiaceae-Acalyphoideae): Phytogeographic connections between the seasonally dry tropical forests of Peru and Brazil, and a review of spinescence in the family
<p><em>Bahiana</em> is expanded from 1 to 2 species with the description of <em>B. occidentalis</em> K. Wurdack, <strong>sp. nov.</strong> as a new endemic of the seasonally dry tropical forests (SDTFs) of Peru. The disjunct distribution of Bahiana with populations of <em>B. occidentalis</em> on opposite sides of the Andes in northwestern Peru (Tumbes, San Martín) and B. pyriformis in eastern Brazil (Bahia) adds to the phytogeographic links among the widely scattered New World SDTFs. Although <em>B. occidentalis</em> remains imperfectly known due to lack of flowering collections, molecular phylogenetic results from four loci (plastid <em>matK</em>, <em>rbcL</em>, and <em>trnL-F</em>; and nuclear ITS) unite the two species as does gross vegetative morphology, notably their spinose stipules, and androecial structure. Spinescence in Euphorbiaceae was surveyed and found on vegetative organs in 25 genera, which mostly have modified sharp branch tips. Among New World taxa, spines that originate from stipule modifications only occur in <em>Bahiana</em> and <em>Acidocroton</em>, while the intrastipular spines of <em>Philyra</em> are of uncertain homologies.</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.