Find research datasets worth reusing

opencc-by-4.0Dec 1869View details →

Fig.32a in Synopsis of the extinct Batrachia, Reptilia and Aves of North America

Fig.32a.

opencc-by-4.0Dec 1869View details →

Fig. 34 in Synopsis of the extinct Batrachia, Reptilia and Aves of North America

Fig. 34.

opencc-by-4.0Mar 2023View details →

Figure 3 in Extinct Neuropterida of Brazil (Insecta: Neuroptera, Megaloptera, Raphidioptera)

Figure 3 Accumulation curve for valid species of extinct Brazilian Neuropterida.

opencc-by-4.0Jun 2009View details →

Fig. 2 in Mandible morphometrics, dental microwear pattern, and palaeobiology of the extinct Balearic Dormouse Hypnomys morpheus

Fig. 2. Distribution of the area (A) and circularity (B) of the mandibles of Hypnomys and Eliomys.

opencc-by-4.0Dec 2002View details →

Fig. 3 in Frasnian-Famennian extinction and recovery of rhynchonellid brachiopods from the East European Platform

Fig. 3. Location of the regions and sections studied.

opencc-by-4.0Dec 2005View details →

Fig. 1 in Post-extinction brachiopod faunas from the Late Permian Wuchiapingian coal series of South China

Fig. 1. Generalized map showing the locations of the Daijiagou and Chuanmu sections.

opencc-by-4.0Dec 2005View details →

Fig. 4 in Post-extinction brachiopod faunas from the Late Permian Wuchiapingian coal series of South China

Fig. 4. Reconstruction of the Edriosteges poyangensis–Spinomarginifera lopingensis Association.

opencc-by-4.0Jun 2024View details →

Trait Networks: Assessing Marine Community Resilience and Extinction Recovery

Data and R code for Trait networks. From the paper:   Trait Networks: Assessing Marine Community Resilience and Extinction Recovery Summary Extensive global habitat degradation and the climate crisis are tipping the biosphere towards a “sixth” mass extinction and marine communities will not be spared from this catastrophic loss of biodiversity. The resilience of marine communities following large-scale disturbances or extinction events is mediated by the life-history traits of species and their interplay within communities. The presence and abundance of traits in communities provide proxies of function, but whether the breakdown of their associations with species loss can delineate functional loss remains unclear. Here, we propose that relationships between traits within trait networks provide unique perspectives on the importance of specific traits, trait combinations, and their role in supporting the stability of communities, whilst allowing quantification of the vulnerability of both past deep time and present-day marine communities.

opencc-by-4.0Oct 2024View details →

PROOF OF THE CLASSICAL MECHANICAL COSMOS IN FIVE ADVERTISEMENT POSTERS THIS CURES SINISTER SCIENCE AND PROVIDES AN EASY WAY OUT OF HOMO SAPIENS' 5000-YEAR WARPATH TOWARD EXTINCTION

Gerhard Ris former DA magistrate and lawyer with thirty years experience in courts of law. The previous DOI publications are in the links below. My last publication on Zenodo ten days ago has 37 views and 43 downloads. This five-page poster article further improves the Elementary Scientist Exam and the six other Zenodo-published articles, including the elementary list with the Unambiguous 1000 Elementary Terms, Definitions, and Descriptions in Elementary Science, Courtrooms, and Schools. (Proven to have a very high view-to-download ratio with 317 views and 243 downloads in six months after publication. A glitch (?) at CERN probably causes a 0 view 0 download error.) The undisputed reason for the improvement follows from the indisputably best-practice correct definition of science. A decent systematic trial and error search for all the laws of everything and an all-inclusive Bildung in Education Permanente. This has been solved and published in mentioned publications as One Law of Nature makes One Law of Human Nature. These two laws elevate all sciences to the wordiness of an exact science. Mind, that this definition can be reduced by redefining certain terms. It’s a never-ending process akin to growing wise oak of the tree-like tower of science continuously broadening and improving its base. This has been successfully done for the first time in 5000 years. Mathematics must be made to fit Nature and not the other way around. Science proper per definition demands all-inclusive Bildung. Bildung requires marketing, advertisement, and sales of science proper. To that end please note this selection of thumbnails as posters advertising the classes explaining the model in chunks of nigh 4-minutes.

opencc-by-4.0Nov 2024View details →

Measurement of interstellar extinction for classical TTauri stars using FUV H2 line fluxes

Understanding the interstellar and potentially circumstellar extinction in sight lines of classical TTauri stars is an important ingredient for constructing reliable spectral energy distributions, which catalyze for example protoplanetary disk chemistry. Therefore, some attempts of measuring AV towards individual stars have been made using partly different wavelength regimes and different under- lying assumptions. Here, we use strong lines of Lyα fluorescent H2 and derive extinction based on the assumption of optically thin transitions. We investigate a sample of 72 classical TTauri stars observed with the Hubble Space Telescope in the framework of the ULLYSES programme. We compute AV and RV values for the 34 with sufficient data quality as well as an additionally AV value for the canonical RV = 3.1-value. Our results agree largely with values obtained from optical data. Moreover, we confirm the degeneracy between AV and RV and present possibilities to break this. Finally, we discuss the validity of the assumption of optical thin lines. Here we show the used line fits and A_V modelling. Appendix of the publication in Astronomy and Astrophysics:  Measurement of interstellar extinction for classical TTauri stars using FUV H2 line fluxes

opencc-zeroDec 2015View details →

Data from: Incorporating explicit geospatial data shows more species at risk of extinction than the current Red List

The IUCN (International Union for Conservation of Nature) Red List classifies species according to their risk of extinction, informing global to local conservation decisions. Unfortunately, important geospatial data do not explicitly or efficiently enter this process. Rapid growth in the availability of remotely sensed observations provides fine-scale data on elevation and increasingly sophisticated characterizations of land cover and its changes. These data readily show that species are likely not present within many areas within the overall envelopes of their distributions. Additionally, global databases on protected areas inform how extensively ranges are protected. We selected 586 endemic and threatened forest bird species from six of the world's most biodiverse and threatened places (Atlantic Forest of Brazil, Central America, Western Andes of Colombia, Madagascar, Sumatra, and Southeast Asia). The Red List deems 18% of these species to be threatened (15 critically endangered, 29 endangered, and 64 vulnerable). Inevitably, after refining ranges by elevation and forest cover, ranges shrink. Do they do so consistently? For example, refined ranges of critically endangered species might reduce by (say) 50% but so might the ranges of endangered, vulnerable, and nonthreatened species. Critically, this is not the case. We find that 43% of species fall below the range threshold where comparable species are deemed threatened. Some 210 bird species belong in a higher-threat category than the current Red List placement, including 189 species that are currently deemed nonthreatened. Incorporating readily available spatial data substantially increases the numbers of species that should be considered at risk and alters priority areas for conservation.

opencc-zeroJan 2020View details →

Data and code from: Phenotypic memory drives population growth and extinction risk in a noisy environment

Random environmental fluctuations pose major threats to wild populations. As patterns of environmental noise are themselves altered by global change, there is growing need to identify general mechanisms underlying their effects on population dynamics. This notably requires understanding and predicting population responses to the color of environmental noise, i.e. its temporal autocorrelation pattern. Here, we show experimentally that environmental autocorrelation has a large influence on population dynamics and extinction rates, which can be predicted accurately provided that a memory of past environment is accounted for. We exposed near to 1000 lines of the microalgae Dunaliella salina to randomly fluctuating salinity, with autocorrelation ranging from negative to highly positive. We found lower population growth, and twice as many extinctions, under lower autocorrelation. These responses closely matched predictions based on a tolerance curve with environmental memory, showing that non-genetic inheritance can be a major driver of population dynamics in randomly fluctuating environments.

opencc-zeroMay 2020View details →

New Age of Fishes initiated by the Cretaceous−Paleogene mass extinction

Ray-finned fishes (Actinopterygii) comprise nearly half of all modern vertebrate diversity, and are an ecologically and numerically dominant megafauna in most aquatic environments. Crown teleost fishes diversified relatively recently, during the Late Cretaceous and early Paleogene, although the exact timing and cause of their radiation and rise to ecological dominance is poorly constrained. Here we use microfossil teeth and shark dermal scales (ichthyoliths) preserved in deep-sea sediments to study the changes in the pelagic fish community in the latest Cretaceous and early Paleogene. We find that the Cretaceous−Paleogene (K/Pg) extinction event marked a profound change in the structure of ichthyolith communities around the globe: Whereas shark denticles outnumber ray-finned fish teeth in Cretaceous deep-sea sediments around the world, there is a dramatic increase in the proportion of ray-finned fish teeth to shark denticles in the Paleocene. There is also an increase in size and numerical abundance of ray-finned fish teeth at the boundary. These changes are sustained through at least the first 24 million years of the Cenozoic. This new fish community structure began at the K/Pg mass extinction, suggesting the extinction event played an important role in initiating the modern "age of fishes."

opencc-zeroJul 2022View details →

Tooth morphology elucidates shark evolution across the end-Cretaceous mass extinction

Sharks (Selachimorpha) are iconic marine predators that have survived multiple mass extinctions over geologic time. Their prolific fossil record is represented mainly by isolated shed teeth, which provide the basis for reconstructing deep time diversity changes affecting different selachimorph clades. By contrast, corresponding shifts in shark ecology, as measured through morphological disparity, have received comparatively limited analytical attention. Here, we use a geometric morphometric approach to comprehensively examine tooth morphologies in multiple shark lineages traversing the catastrophic end-Cretaceous mass extinction — this event terminated the Mesozoic Era 66 million years ago. Our results show that selachimorphs maintained virtually static levels of dental disparity in most of their constituent clades across the Cretaceous–Paleogene interval. Nevertheless, selective extinctions did impact apex predator species characterized by triangular blade-like teeth. This is particularly evident among lamniforms, which included the dominant Cretaceous anacoracids. Conversely, other groups, such as carcharhiniforms and orectolobiforms, experienced disparity modifications, while heterodontiforms, hexanchiforms, squaliforms, squatiniforms, and †synechodontiforms were not overtly affected. Finally, while some lamniform lineages disappeared, others underwent post-extinction disparity increases, especially odontaspidids, which are typified by narrow-cusped teeth adapted for feeding on fishes. Notably, this increase coincides with the early Paleogene radiation of teleosts as a possible prey source, and the geographic relocation of disparity sampling 'hotspots', perhaps indicating a regionally disjunct extinction recovery. Ultimately, our study reveals a complex morphological response to the end-Cretaceous mass extinction and highlights an event that influenced the evolution of modern sharks.

Figure 8 in Six new feather mite species (Acari: Astigmata) from the carolina parakeet Conuropsis carolinensis (Psittaciformes: Psittacidae), an extinct parrot of North America

Figure 8. Protonyssus proctorae sp. n., female. (A) Dorsal view; (B) ventral view.

Figure 2 in Six new feather mite species (Acari: Astigmata) from the carolina parakeet Conuropsis carolinensis (Psittaciformes: Psittacidae), an extinct parrot of North America

Figure 2. Lopharalichus beckeri sp. n., female. (A) Dorsal view; (B) ventral view.

Figure 9 in Six new feather mite species (Acari: Astigmata) from the carolina parakeet Conuropsis carolinensis (Psittaciformes: Psittacidae), an extinct parrot of North America

Figure 9. Fainalges gracilitarsus sp. n., male. (A) Dorsal view; (B) ventral view.

Figure 6 in Six new feather mite species (Acari: Astigmata) from the carolina parakeet Conuropsis carolinensis (Psittaciformes: Psittacidae), an extinct parrot of North America

Figure 6. Chiasmalges carolinensis sp. n., male. (A) Dorsal view; (B) ventral view; (C) tarsus IV.

opencc-by-4.0May 2010View details →

Figure 7. A in A New Genus for the Extinct Late Pleistocene Owl Strix brea Howard (Aves: Strigiformes) from Rancho La Brea, California

Figure 7. A scatter plot of total length vs. distal width of the carpometacarpus of Oraristrix