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1,999 results for “Endangered”
Data from: Immediate genetic augmentation and enhanced habitat connectivity are required to secure the future of an iconic endangered freshwater fish population
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A total evidence approach justifies taxonomic splitting of the endangered Pecos Gambusia into three species
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Evaluating the suitability of close-kin mark-recapture as a demographic modelling tool for a critically endangered elasmobranch population
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Estimating the abundance of the critically endangered Baltic Proper harbour porpoise (Phocoena phocoena) population using passive acoustic monitoring
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Data from: Growth and longevity of the endangered freshwater pearl mussel (Margaritifera margaritifera): Implications for conservation and management
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Predicting harvest impact and establishment success when translocating highly mobile and endangered species
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Data from: Genetic diversity, demographic history and neo-sex chromosomes in the Critically Endangered Raso lark
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Avian botulism is a primary, year-round threat to adult survival in the endangered Hawaiian Duck (Anas wyvilliana) on Kaua‘i, Hawai‘i, USA
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Time-varying flow-ecology relationships for an endangered fish population: Longfin Smelt in the San Francisco Estuary
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Genetic structure and historic demography of endangered unarmored threespine stickleback at southern latitudes signals a need for new management directives
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Migration in drought: Receding streams contract the seaward migration window of endangered salmon
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Long-term demographic data on the endangered legume Crotalaria avonensis, from Carter Creek Tract, Lake Wales Ridge Wildlife Environmental Area, 1998-2017 (ongoing)
This dataset contains demographic data from a long-term study of Crotalaria avonensis (Avon Park Harebells; Fabaceae), a federally and state endangered plant endemic to a small area on the Lake Wales Ridge, central Florida. The plant is a small perennial herbaceous legume. The dataset includes data from 1998 through 2017 from the Carter Creek Unit of the Lake Wales Ridge Wildlife Environmental Area. Data collected include survival, size, and reproductive data from individual plants located in permanent quadrats. There are also data on six fires, caging to reduce herbivory, and other events that affected plants.
Data from: Pollen limitation in the endangered Chinese endemic species Sinocalycanthus chinensis
<p>Pollen limitation negatively impacts endangered and endemic plants with small fragmented populations, such as <i>S</i><i>inocalycanthus chinensis</i><i>, </i>an endangered plant endemic to China. In this study, we analyzed the pollen limitation of the <i>S. chinensis</i> Damingshan (DMS) population in 2006, 2009, and 2010, and crossed plants with mates separated by different distances, both within and between populations. The DMS population exhibited strong pollen limitation in fruit set, seed set, and seeds per fruit in 2006, 2009, and 2010. The average accumulated pollen limitation (for fruit set times seeds per fruit) was 0.510 ± 0.180. Progeny crossed with pollen from intermediate neighboring plants within the same population (separated by 30 – 50 m from pollen recipients) had the lowest fitness. No optimal outcrossing distance was found within the<i> </i>DMS population. Progeny from crosses with the SXW and DLS populations performed relatively better, while those from crosses with QLF and LXS populations performed worse. Compared with average reproductive success, outbreeding depression was found in progeny from crosses with the LXS and QLF populations. Reproductive success from pure self-pollination indicated <i>S. chinensis </i>is self-compatible. Geitonogamous selfing increased reproductive success. Based on geitonogamous selfing, the proportion of selfed offspring was relatively high. These results provide basic references for the conservation of this species.</p>
Data from: Greater agility increases probability of survival in the endangered northern quoll
<p>Introduced predators combined with habitat loss and modification are threatening biodiversity worldwide, particularly the 'critical weight range' (CWR) mammals of Australia. In order to mitigate the impacts of invasive predators on native species in different landscapes, we must understand how the prey's morphology and performance determine their survival. Here we evaluate how phenotypic traits related to escape performance predict the probability of survival for an endangered CWR mammal, the northern quoll (<em>Dasyurus hallucatus</em>). We measured mass, body size, body shape, body condition, and age, as well as maximum sprint speed, acceleration, and agility of female quolls over two consecutive years. Those with higher body condition and agility around a 135° corner were more likely to survive their first 21 months of life but were not more likely to survive after this period. No other morphological or performance traits affected survival. Heavier second-year individuals were more agile than first-years but second-years experienced higher mortality rates throughout the year. Females with higher body condition and agility around a 135° corner tended to have shorter limbs and feet but larger heads. Our findings suggest that higher body condition and agility are advantageous for survival in female northern quolls. These results can be used to develop predictive models of predator-prey interactions based on performance capacities and how performance is affected by habitat, aiding conservation efforts to predict and manage the impacts of introduced predators on native species.</p>
Data from: Genetic diversity and conservation status of Helianthus verticillatus, an endangered sunflower of the Southern United States
<p>Evaluating species diversity and patterns of population genetic variation is an essential aspect of conservation biology to determine appropriate management strategies and preserve the biodiversity of native plants. Habitat fragmentation and potential habitat loss are often an outcome of a reduction in naturally occurring wildfires and controlled prescribed burning, as seen in <i>Helianthus verticillatus</i> (whorled sunflower). This endangered, wild relative of the common sunflower, <i>Helianthus annuus</i>, is endemic to four locations in Alabama, Georgia, and Tennessee, United States. Despite its endangered status, there is no recovery plan for <i>H. verticillatus</i>, and knowledge related to its basic plant biology and importance in ecosystem services is mostly unknown. In this study, we utilized 14 microsatellite loci to investigate fine-scale population structure and genetic diversity of <i>H. verticillatus</i> individuals found on two sampling sites within the Georgia population. Our results indicated moderate genetic diversity and the presence of two distinct genetic clusters. Analyses of molecular variance indicated that the majority of variance was individually based, thus confirming high genetic differentiation and limited gene flow between <i>H. verticillatus</i> collection sites. The evidence of a population bottleneck in these sites suggests a recent reduction in population size that could be explained by habitat loss and population fragmentation. Also, high levels of linkage disequilibrium were detected, putatively suggesting clonal reproduction among these individuals. Our study provides a better understanding of fine-scale genetic diversity and spatial distribution of <i>H. verticillatus</i> populations in Georgia. Our results can underpin an original recovery plan for <i>H. verticillatus</i> that could be utilized for the conservation of this endangered species and to promote its persistence in the wild.</p>
Restoration thinning permits stems to capitalise on high-rainfall years in a regenerating endangered forest ecosystem
<p><span>1. Passively regenerating native vegetation presents a cost-effective opportunity to sequester carbon and reinstate habitat in heavily cleared agricultural landscapes.</span></p> <p><span>2. However, in some cases a few woody species recolonise in dense, low-diversity stands that are slow to self-thin.</span></p> <p><span>3. Restoration thinning of over-dominant species has been proposed to accelerate ecosystem recovery, but its longer-term efficacy remains uncertain, and is likely to depend strongly on rainfall.</span></p> <p><span>4. This study focuses on a restoration thinning experiment established in 2007 in dense brigalow (<i>Acacia harpophylla</i>) regrowth in Queensland, Australia. Using variation in rainfall between 2007 and 2017, we examined the interactive effects of neighbourhood density and moisture availability on the growth and survival of <i>A. harpophylla. </i></span></p> <p><span>5. We also compared the strength of <i>A. harpophylla</i> density effects on itself to its effects on a sparsely distributed co-occurring tree species (<i>Casuarina cristata</i>) that was codominant in the original forest.</span></p> <p><span>6. Our results provide clear evidence that thinning permits <i>A. harpophylla</i> to grow rapidly during periods of high rainfall, and that interspecific competition between A<i>. harpophylla</i> and <i>C. cristata</i> is relatively weak. As such, thinning of dense <i>A. harpophylla</i> could be combined with seeding or planting of co-occurring tree species with complementary niches to further accelerate forest recovery in this extensive regrowth ecosystem.</span></p>
The demographic contributions of connectivity versus local dynamics to population growth of an endangered bird
<p>1. Conservation and management increasingly focus on connectivity, because connectivity driven by variation in immigration rates across landscapes is thought to be crucial for maintaining local population and metapopulation persistence. Yet, efforts to quantify the relative role of immigration on population growth across the entire range of species and over time have been lacking.</p> <p>2. We assessed whether immigration limited local and range-wide population growth of the endangered snail kite (Rostrhamus sociabilis) in Florida, USA, over 18 years using multi-state, reverse-time modeling that accounts for imperfect detection of individuals and unobservable states. Demographic contributions of immigration varied depending on the dynamics and geographic position of the local populations, were scale-dependent, and changed over time.</p> <p>3. By comparing the relative contributions of immigration versus local demography for periods of significant change in local abundance, we found empirical evidence for a disproportionately large role of immigration in facilitating population growth of a centrally-located population—a connectivity 'hub'. The importance of connectivity changed depending of the spatial scale considered, such that immigration was more important driver of population growth at small versus large spatial scales. Furthermore, the contribution of immigration was much greater during time periods when local population size was small, emphasizing abundance-dependent rescue effects.</p> <p>4. Our findings suggest that efforts aimed at improving local breeding habitat will likely be most effective at increasing snail kite population growth. More broadly, our results provide much needed information on the role of connectivity for population growth, suggesting that connectivity conservation may have the greatest benefits when efforts focus on centrally located habitat patches and small populations. Furthermore, our results highlight that connectivity is highly dynamic over time and that interpreting the effects of connectivity at local scales may not transfer to region-wide dynamics.</p>
Estimating the inbreeding level and genetic relatedness in an isolated population of critically endangered Sichuan taimen (Hucho bleekeri) using genome wide SNP markers
<p>Sichuan taimen (Hucho bleekeri) is critically endangered fish listed in The Red List of Threatened Species compiled by the International Union for Conservation of Nature (IUCN). Specific locus amplified fragment sequencing (SLAF-seq)-based genotyping was performed for Sichuan taimen with 43 yearling individuals from 3 locations in Taibai River (a tributary of Yangtze River) that has been sequestered from its access to the ocean for more than 30 years since late 1980s. Applying the inbreeding level and genetic relatedness estimation using 15,396 genome wide SNP markers, we found that the inbreeding level of this whole isolated population was at a low level (average F=2.6×10-3±0.079), and the means of coancestry coefficients within and between the three sampling locations were all very low (close to 0), too. Genomic differentiation was negatively correlated with the geographical distances between the sampling locations (p < 0.001) and the 43 individuals could be considered as genetically independent two groups. The low levels of genomic inbreeding and relatedness indicated a relatively large number of sexually mature individuals were involved in reproduction in Taibai River. This study suggested a genomic-relatedness-guided breeding and conservation strategy for wild fish species without pedigree information records.</p>
Data from: Reduced skin bacterial diversity correlates with increased pathogen infection intensity in an endangered amphibian host
The fungal pathogen Batrachochytrium dendrobatidis (Bd) infects the skin of amphibians, and has caused severe declines and extinctions of amphibians globally. In this study, we investigate the interaction between Bd and the bacterial skin microbiome of the endangered Sierra Nevada yellow-legged frog, Rana sierrae, using both culture-dependent and culture-independent methods. Samples were collected from two populations of R. sierrae that likely underwent Bd epizootics in the past, but that continue to persist with Bd in an enzootic disease state, and we address the hypothesis that such "persistent" populations are aided by mutualistic skin microbes. Our 16S rRNA metabarcoding data reveal that the skin microbiome of highly infected juvenile frogs is characterized by significantly reduced species richness and evenness, and by strikingly lower variation between individuals, compared to juveniles and adults with lower infection levels. Over 90% of DNA sequences from the skin microbiome of highly infected frogs were derived from bacteria in a single order, Burkholderiales, compared to just 54% in frogs with lower infection levels. In a culture-dependent Bd-inhibition assay, the bacterial metabolites we evaluated all inhibited the growth of Bd. Together, these results illustrate the disruptive effects of Bd infection on host skin microbial community structure and dynamics, and suggest possible avenues for the development of anti-Bd probiotic treatments.
Data from: Large-scale recovery of an endangered amphibian despite ongoing exposure to multiple stressors
Amphibians are one of the most threatened animal groups, with 32% of species at risk for extinction. Given this imperiled status, is the disappearance of a large fraction of the Earth's amphibians inevitable, or are some declining species more resilient than is generally assumed? We address this question in a species that is emblematic of many declining amphibians, the endangered Sierra Nevada yellow-legged frog (Rana sierrae). Based on >7,000 frog surveys conducted across Yosemite National Park over a 20-y period, we show that, after decades of decline and despite ongoing exposure to multiple stressors, including introduced fish, the recently emerged disease chytridiomycosis, and pesticides, R. sierrae abundance increased sevenfold during the study and at a rate of 11% per year. These increases occurred in hundreds of populations throughout Yosemite, providing a rare example of amphibian recovery at an ecologically relevant spatial scale. Results from a laboratory experiment indicate that these increases may be in part because of reduced frog susceptibility to chytridiomycosis. The disappearance of nonnative fish from numerous water bodies after cessation of stocking also contributed to the recovery. The large-scale increases in R. sierrae abundance that we document suggest that, when habitats are relatively intact and stressors are reduced in their importance by active management or species' adaptive responses, declines of some amphibians may be partially reversible, at least at a regional scale. Other studies conducted over similarly large temporal and spatial scales are critically needed to provide insight and generality about the reversibility of amphibian declines at a global scale.
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These curated guides explain access requirements, typical timelines, costs, and reuse considerations for widely used research datasets.
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.