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Argues in favor of free and open access to bird specimen data. Impact of Internet technologies on the feasibility of information resource systems; Advantages of distributed databases across regions and countries; Funding potential of community efforts.

Range limits and secondary contact zones often occur at ecotones between major associations of habitat and climate. Therefore, understanding processes that limit sympatry between species in such areas provides an important framework for testing biogeographic and evolutionary hypotheses. Theoretical and empirical work has shown that the evolution of species borders is influenced by a complexity of factors, including gene flow from central to peripheral populations and the ability of species to adapt locally to environmental conditions. However, few studies have used bioclimatic models, combined with molecular and morphological data, to predict geographic range limits in the context of gene flow across a secondary contact zone. In this study, I applied these methods to test specific hypotheses about barriers to sympatry between closely related species where they approach and contact each other. Specifically, I examined the importance of historical isolation, local adaptation, and symmetry of gene flow in limiting sympatry and range expansion of ecologically distinct species across environmental gradients. Molecular (mitochondrial DNA, allozymes), morphological, and bioclimatic data were obtained for two avian sibling species (Baeolophus inornatus and B. ridgwayi) that exist in recent, narrow secondary contact in northern California. These species are broadly allopatric and occupy rangewide associations of oak and pinyon-juniper woodlands, respectively, although B. inornatus also inhabits mixed or juniper woodlands locally. Patterns of molecular variation generally were congruent with morphological and bioclimatic data, and support prior evidence for a history of isolation, adaptation, and divergence in distinctive, species-specific vegetation-climate associations. However, molecular and morphological clines fall east of the limit of oaks, and individuals of B. inornatus in this juniper-associated contact zone experience bioclimates that are more... [ABSTRACT FROM AUTHOR]

Presents the 45th supplement to the American Ornithologists' Union "Check-List of North American Birds." Categories of the changes in the supplement; Species of birds added to the list; List of bird names in English that were changed without change in the scientific name.

The timing of origin of modern North American bird species in relation to Pleistocene glaciations has long been the topic of significant discussion and disagreement. Recently, Klicka and Zink (1997) and Avise and Walker (1998) enlivened this debate by using calibrated molecular distance values to estimate timing of speciations. Here we use new molecular studies to test their conclusions. Molecular distance values for 39 pairs of proven sister species, 27 of which are based on new data, alter the currently perceived pattern that avian species splits occurred mainly in the Pliocene and early-mid-Pleistocene. Mitochondrial DNA divergence values for this set of taxa showed a skewed distribution pointing toward relatively young speciation times, in contrast to the pattern presented by Klicka and Zink (1997) for 35 sister plus non-sister species pairs. Our pattern was not significantly different from that of Avise and Walker (1998) for "intraspecific phylogroups," some of which are species. We conclude that the entire Pleistocene, including the last two glacial cycles (<250,000 years ago), was important in speciations of modern North American birds. A substantial number of speciations were both initiated and completed in the last 250,000 years. Simultaneously, many taxa began to diverge in the Pleistocene but their speciations are not yet complete (per Avise and Walker 1998). The suggestion that durations of speciations average two million years is probably a substantial overestimate. [ABSTRACT FROM AUTHOR]

Presents a listing of bird species found in North America provided by the American Ornithologists' Union.

Presents the 43rd supplement to the American Ornithologists' Union's (AOU) check-list of North American birds which is a summary of the decisions made by the Committee on Classification and Nomenclature of the AOU between January 1, 2000 and December 31, 2001.

Presents information on a study which compared the song variation of Swamp Sparrow with Song Sparrow using vocal recordings from male breeding in montane meadows of the Sierra Nevada and San Bernardino Mountains in California. Methodology of the study; Results and discussion on the study.

Stable isotope data have made pivotal contributions to nearly every discipline of the physical and natural sciences. As the generation and application of stable isotope data continues to grow exponentially, so does the need for a unifying data repository to improve accessibility and promote collaborative engagement. This paper provides an overview of the design, development, and implementation of IsoBank (www.isobank.org), a community-driven initiative to create an open-access repository for stable isotope data implemented online in 2021. A central goal of IsoBank is to provide a web-accessible database supporting interdisciplinary stable isotope research and educational opportunities. To achieve this goal, we convened a multi-disciplinary group of over 40 analytical experts, stable isotope researchers, database managers, and web developers to collaboratively design the database. This paper outlines the main features of IsoBank and provides a focused description of the core metadata structure. We present plans for future database and tool development and engagement across the scientific community. These efforts will help facilitate interdisciplinary collaboration among the many users of stable isotopic data while also offering useful data resources and standardization of metadata reporting across eco-geoinformatics landscapes. [ABSTRACT FROM AUTHOR]

Investigates the different species of the Least Tern in North America. Identification of the different species; Where do these species nest; Information on the category in which the subspecies should be assessed; Sex differences between the birds; Methodology used to carry out the investigation; Results of the investigation.

Pays tribute to Ned Keith Johnson, president and life member of the American Ornithologists' Union.

We announce the assembly of the first de novo reference genome for the California Scrub-Jay (Aphelocoma californica). The genus Aphelocoma comprises four currently recognized species including many locally adapted populations across Mesoamerica and North America. Intensive study of Aphelocoma has revealed novel insights into the evolutionary mechanisms driving diversification in natural systems. Additional insights into the evolutionary history of this group will require continued development of high-quality, publicly available genomic resources. We extracted high molecular weight genomic DNA from a female California Scrub-Jay from northern California and generated PacBio HiFi long-read data and Omni-C chromatin conformation capture data. We used these data to generate a de novo partially phased diploid genome assembly, consisting of two pseudo-haplotypes, and scaffolded them using inferred physical proximity information from the Omni-C data. The more complete pseudo-haplotype assembly (arbitrarily designated "Haplotype 1") is 1.35 Gb in total length, highly contiguous (contig N50 = 11.53 Mb), and highly complete (BUSCO completeness score = 97%), with comparable scaffold sizes to chromosome-level avian reference genomes (scaffold N50 = 66.14 Mb). Our California Scrub-Jay assembly is highly syntenic with the New Caledonian Crow reference genome despite ~10 million years of divergence, highlighting the temporal stability of the avian genome. This high-quality reference genome represents a leap forward in publicly available genomic resources for Aphelocoma , and the family Corvidae more broadly. Future work using Aphelocoma as a model for understanding the evolutionary forces generating and maintaining biodiversity across phylogenetic scales can now benefit from a highly contiguous, in-group reference genome. [ABSTRACT FROM AUTHOR]

Natural history museums are vital repositories of specimens, samples and data that inform about the natural world; this Formal Comment revisits a Perspective that advocated for the adoption of compassionate collection practices, querying whether it will ever be possible to completely do away with whole animal specimen collection. [ABSTRACT FROM AUTHOR]

Animal coloration serves many biological functions and must therefore balance potentially competing selective pressures. For example, many animals have camouflage in which coloration matches the visual background that predators scan for prey. However, different colors reflect different amounts of solar radiation and may therefore have thermoregulatory implications as well. In this study, we examined geographic variation in dorsal patterning, coloration, and solar reflectance among horned larks (Eremophila alpestris) of the western United States. We found that plumage brightness was positively associated with soil granularity, aridity, and temperature. Plumage redness—both in terms of saturation (i.e., chroma) and hue—was positively associated with soil redness and temperature, while plumage patterning was positively associated with soil granularity. Together, these plumage-environment associations support both background matching and Gloger's rule, a widespread ecogeographic pattern in animal coloration. We also constructed thermoregulatory models that estimated cooling benefits provided by solar reflectance profiles of the dorsal plumage of each specimen based on the collection site. We found increased cooling benefits in hotter, more arid environments. Finally, cooling benefits were positively associated with residual brightness, such that individuals that were brighter than expected based on environmental conditions also had higher cooling benefits, suggesting a trade-off between camouflage and thermoregulation. Together, these data suggest that natural selection has balanced camouflage and thermoregulation in horned larks, and they illustrate how multiple competing evolutionary pressures may interact to shape geographic variation in adaptive phenotypes. [ABSTRACT FROM AUTHOR]

ABSTRACT Introduction. To date, women may use flexible oral contraceptive (OC) regimens. Aim. The aim of this study was to evaluate the quality of sexual life of healthy women on continued-regimen OCs. Methods. Fifty women (age range 18-38) were enrolled. The Female Sexual Function Index (FSFI) and the Short Form-36 (SF-36) questionnaires were used to investigate, respectively, sexual behavior and the quality of life (QoL) of women on OC for 72 days with a 4-day hormone-free interval, for two cycles. Both the FSFI and the SF-36 were administered before starting OC intake, at the first (72-82 days) and the second (144-154 days) follow-ups. Main Outcome Measure. The main outcomes are the FSFI and the SF-36 questionnaires. Results. The FSFI score obtained at the first follow-up detected a worsening with respect to baseline score ( P < 0.05). The score obtained at the second follow-up detected an improvement with respect to both the baseline and the first follow-up total scores ( P < 0.05). QoL improved at the first follow-up only as regards body pain ( P < 0.05), and at the second follow-up as regards: physical role, body pain, general health, vitality, and social function ( P < 0.05). Conclusions. The use of continued-regimen OCs is able to improve the sexual behavior and the QoL of women. Caruso S, Malandrino C, Cicero C, Ciancio F, Cariola M, and Cianci A. Quality of sexual life of women on oral contraceptive continued-regimen: Pilot study. J Sex Med **;**:**-**. [ABSTRACT FROM AUTHOR]