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William Merritt Chase : a modern master
The history of modern art owes a great debt to William Merritt Chase (1849-1916), one of America's influential artists and educators. Chase was a leading member of the international artistic avant-garde and was best known for his mastery of a wide range of subjects in oil and pastel, including figures, landscapes, urban park scenes, interiors, and portraits. As a teacher and founder of the Shinnecock Summer School of Art and the New York School of Art, Chase mentored a new generation of modernists, including Edward Hopper, Georgia O'Keeffe, and Joseph Stella. A century after his death, the breadth and richness of Chase's career are celebrated in this beautifully illustrated publication. Five essays by prominent scholars of American art offer new insights into Chase's multi-faceted artistic practice and his position in the international cultural climate at the turn of the 20th century.
Book
Contribution to the Systematics of Dicerataspis Ashmead, 1896 (Hymenoptera: Cynipoidea: Figitidae)
This paper deals with the identity, geographical distribution and host associations of Dicerataspis species. The authors propose the new synonymy Dicerataspis grenadensisAshmead, 1896 (= D. flavipesKieffer, 1909) and redescribe and illustrate D. grenadensis.
Journal Article
How can the European Common Agricultural Policy help halt biodiversity loss? Recommendations by over 300 experts
The European Union's Common Agricultural Policy (CAP) has not halted farmland biodiversity loss. The CAP post‐2023 has a new ‘‘Green Architecture,’’ including the new ‘‘Eco‐scheme’’ instrument. How can this new Green Architecture help tackle the biodiversity crisis? Through 13 workshops and an online survey, over 300 experts from 23 European Member States addressed this question. From experts’ contributions, key principles for success include preserving and restoring (semi)natural elements and extensive grasslands; improving spatial planning and landscape‐scale implementation, including through collective actions; implementing result‐based approaches; and improved knowledge exchange. To maximize the effectiveness of Eco‐scheme for biodiversity, experts highlighted the need to prioritize evidence‐based actions, allocate a sufficient budget for biodiversity, and incentivize management improvements through higher payment levels. Additionally, stronger coherence is needed among CAP instruments. For effective CAP implementation, the European Commission and the Member States should expand investments in biodiversity monitoring, knowledge transfer, and capacity‐building within relevant institutions. The remaining risks in the CAP's ability to reverse the loss of farmland biodiversity still require better design, closer monitoring, greater transparency, and better engagement with farmers. Additionally, greater involvement of scientists is needed to guide the CAP toward restoring farmland biodiversity while accounting for synergies and trade‐offs with other objectives.
Journal Article
Evidence of Pathogen-Induced Immunogenetic Selection across the Large Geographic Range of a Wild Seabird
Over evolutionary time, pathogen challenge shapes the immune phenotype of the host to better respond to an incipient threat. The extent and direction of this selection pressure depend on the local pathogen composition, which is in turn determined by biotic and abiotic features of the environment. However, little is known about adaptation to local pathogen threats in wild animals. The Gentoo penguin (Pygoscelis papua) is a species complex that lends itself to the study of immune adaptation because of its circumpolar distribution over a large latitudinal range, with little or no admixture between different clades. In this study, we examine the diversity in a key family of innate immune genes—the Toll-like receptors (TLRs)—across the range of the Gentoo penguin. The three TLRs that we investigated present varying levels of diversity, with TLR4 and TLR5 greatly exceeding the diversity of TLR7. We present evidence of positive selection in TLR4 and TLR5, which points to pathogen-driven adaptation to the local pathogen milieu. Finally, we demonstrate that two positively selected cosegregating sites in TLR5 are sufficient to alter the responsiveness of the receptor to its bacterial ligand, flagellin. Taken together, these results suggest that Gentoo penguins have experienced distinct pathogen-driven selection pressures in different environments, which may be important given the role of the Gentoo penguin as a sentinel species in some of the world’s most rapidly changing environments.
Journal Article
BLACK LIKE M -- THE AFRICAN INFLUENCE IN MEXICO
[Gaspar Yanga]'s story, like all Afro-Mexican history, is not well-known, according to [Sagrario Cruz-Carretero]. \"In history classes he's not usually mentioned,\" she said. \"Even in Veracruz, not all people know who Yanga was.\" From the Afro-Mexican beauty in Manuel Alvarez Bravo's 1947 Black Mirror; to Joaqun Santamara's Malecn del Paseo, an image of three boys hanging out on a dock; to Tony Gleaton's 1990 The Barber Shop; many of the show's photographs are stunning artworks that together take on new meaning. In the next few rooms, movie posters from the 1950s and 1960s, handmade dolls with elaborate costumes by an anonymous 19th-century maker, and a polychrome wooden carving of a child musician -- all clearly depicting Mexicans of African descent - - seem to insist that no matter how hard an African presence is denied, Afro-Mexicans have been making their contributions to the culture for centuries. The African Presence is not just about history, [Claudia Isaac] said during a phone interview. \"We are talking about a contemporary Afro- Mexican presence, and it's a presence of resistance,\" Isaac said. \"It's shared with a history against oppression in the United States and elsewhere.\"
Newspaper Article
Integrating hybrid zone analyses in species delimitation: lessons from two anuran radiations of the Western Mediterranean
Molecular ecologists often rely on phylogenetic evidence for assessing the species-level systematics of newly discovered lineages. Alternatively, the extent of introgression at phylogeographic transitions can provide a more direct test to assign candidate taxa into subspecies or species categories. Here, we compared phylogenetic versus hybrid zone approaches of species delimitation in two groups of frogs from the Western Mediterranean region (Discoglossus and Pelodytes), by using genomic data (ddRAD). In both genera, coalescent analyses recovered almost all nominal taxa as \"species\". However, the least-diverged pairs D. g. galganoi/jeanneae and P. punctatus/hespericus admix over hundreds of kilometers, suggesting that they have not yet developed strong reproductive isolation and should be treated as conspecifics. In contrast, the comparatively older D. scovazzi/pictus and P. atlanticus/ibericus form narrow contact zones, consistent with species distinctiveness. Due to their complementarity, we recommend taxonomists to combine phylogenomics with hybrid zone analyses to scale the gray zone of speciation, i.e., the evolutionary window separating widely admixing lineages versus nascent reproductively isolated species. The radically different transitions documented here conform to the view that genetic incompatibilities accumulating with divergence generate a weak barrier to gene flow for long periods of time, until their effects multiply and the speciation process then advances rapidly. Given the variability of the gray zone among taxonomic groups, at least from our current abilities to measure it, we recommend to customize divergence thresholds within radiations to categorize lineages for which no direct test of speciation is possible.
Journal Article
Positive selection over the mitochondrial genome and its role in the diversification of gentoo penguins in response to adaptation in isolation
Although mitochondrial DNA has been widely used in phylogeography, evidence has emerged that factors such as climate, food availability, and environmental pressures that produce high levels of stress can exert a strong influence on mitochondrial genomes, to the point of promoting the persistence of certain genotypes in order to compensate for the metabolic requirements of the local environment. As recently discovered, the gentoo penguins (Pygoscelis papua) comprise four highly divergent lineages across their distribution spanning the Antarctic and sub-Antarctic regions. Gentoo penguins therefore represent a suitable animal model to study adaptive processes across divergent environments. Based on 62 mitogenomes that we obtained from nine locations spanning all four gentoo penguin lineages, we demonstrated lineage-specific nucleotide substitutions for various genes, but only lineage-specific amino acid replacements for the ND1 and ND5 protein-coding genes. Purifying selection (dN/dS < 1) is the main driving force in the protein-coding genes that shape the diversity of mitogenomes in gentoo penguins. Positive selection (dN/dS > 1) was mostly present in codons of the Complex I (NADH genes), supported by two different codon-based methods at the ND1 and ND4 in the most divergent lineages, the eastern gentoo penguin from Crozet and Marion Islands and the southern gentoo penguin from Antarctica respectively. Additionally, ND5 and ATP6 were under selection in the branches of the phylogeny involving all gentoo penguins except the eastern lineage. Our study suggests that local adaptation of gentoo penguins has emerged as a response to environmental variability promoting the fixation of mitochondrial haplotypes in a non-random manner. Mitogenome adaptation is thus likely to have been associated with gentoo penguin diversification across the Southern Ocean and to have promoted their survival in extreme
Journal Article
Measuring Oxidative Stress: The Confounding Effect of Lipid Concentration in Measures of Lipid Peroxidation
Lipid peroxidation products are widely used as markers of oxidative damage in the organism. To properly interpret the information provided by these markers, it is necessary to know potential sources of bias and control confounding factors. Here, we investigated the relationship between two indicators of lipid mobilization (circulating levels of triglycerides and cholesterol) and two common markers of oxidative damage (plasma levels of malondialdehyde and hydroperoxides; the latter estimated from the d-ROMs assay kit). The following five avian species were studied: red-legged partridge (Alectoris rufa), zebra finch (Taeniopygia guttata), spotless starling (Sturnus unicolor), marsh harrier (Circus aeroginosus), and Montagu’s harrier (Circus pygargus). In all cases, plasma triglyceride levels positively and significantly correlated with lipid peroxidation markers, explaining between 8% and 34% of their variability. Plasma cholesterol, in contrast, showed a significant positive relationship only among spotless starling nestlings and a marginally significant association in zebra finches. These results indicate that lipid peroxidation marker levels covary with circulating lipid levels. We discuss the potential causes and implications of this covariation and recommend that future studies that measure oxidative damage using lipid peroxidation markers report both raw and relative levels (i.e., corrected for circulating triglycerides). Whether the observed pattern also holds for other tissues and in other taxa would deserve further research.
Journal Article