Characterization of MHC-I in the blue tit (Cyanistes caeruleus) reveals low levels of genetic diversity and trans-population evolution across European populations

The major histcompatibility complex (MHC) is a vital component of the adaptive immune system in all vertebrates. This study is the first to characterize MHC class I (MHC-I) in blue tits (Cyanistes caeruleus), and we use MHC-I exon 3 sequence data from individuals originating from three locations across Europe: Spain, the Netherlands to Sweden. Our phylogeny of the 17 blue tit MHC-I alleles contains one allele cluster with low nucleotide diversity compared to the remaining more diverse alleles. We found a significant evidence for balancing selection in the peptide-binding region in the diverse allele group only. No separation according to geographic location was found in the phylogeny of alleles. Although the number of MHC-I loci of the blue tit is comparable to that of other passerine species, the nucleotide diversity of MHC-I appears to be much lower than that of other passerine species, including the closely related great tit (Parus major) and the severely inbred Seychelles warbler (Acrocephalus sechellensis). We believe that this initial MHC-I characterization in blue tits provides an important step towards understanding the mechanisms shaping MHC-I diversity in natural populations

Effect of Dam Emplacement and Water Level Changes on Sublacustrine Geomorphology and Recent Sedimentation in Jackson Lake, Grand Teton National Park (Wyoming, United States)

Dam installation on a deep hydrologically open lake provides the experimental framework necessary to study the influence of outlet engineering and changing base levels on limnogeological processes. Here, high-resolution seismic reflection profiles, sediment cores, and historical water level elevation datasets were employed to assess the recent depositional history of Jackson Lake, a dammed glacial lake located adjacent to the Teton fault in western Wyoming (USA). Prograding clinoforms imaged in the shallow stratigraphy indicate a recent lake-wide episode of delta abandonment. Submerged ∼11–12 m below the lake surface, these Gilbert-type paleo-deltas represent extensive submerged coarse-grained deposits along the axial and lateral margins of Jackson Lake that resulted from shoreline transgression following dam construction in the early 20th century. Other paleo-lake margin environments, including delta plain, shoreline, and glacial (drumlins, moraines) landforms were likewise inundated following dam installation, and now form prominent features on the lake floor. In deepwater, a detailed chronology was established using 137Cs, 210Pb, and reservoir-corrected 14C for a sediment core that spans ∼1654–2019 Common Era (CE). Dam emplacement (1908–1916 CE) correlates with a nearly five-fold acceleration in accumulation rates and a depositional shift towards carbonaceous sediments. Interbedded organic-rich black diatomaceous oozes and tan silts track changes in reservoir water level elevation, which oscillated in response to regional climate and downstream water needs between 1908 and 2019 CE. Chemostratigraphic patterns of carbon, phosphorus, and sulfur are consistent with a change in nutrient status and productivity, controlled initially by transgression-driven flooding of supralittoral soils and vegetation, and subsequently with water level changes. A thin gravity flow deposit punctuates the deepwater strata and provides a benchmark for turbidite characterization driven by hydroclimate change. Because the Teton fault is a major seismic hazard, end-member characterization of turbidites is a critical first step for accurate discrimination of mass transport deposits controlled by earthquakes in more ancient Jackson Lake strata. Results from this study illustrate the influence of dam installation on sublacustrine geomorphology and sedimentation, which has implications for lake management and ecosystem services. Further, this study demonstrates that Jackson Lake contains an expanded, untapped sedimentary archive recording environmental changes in the American West

Pushing down on me: The paradoxical role of self-leadership in the context of work pressure

One of the most pressing threats to individual employees in today's fast-paced work environment is work pressure. In this paper, the intention is to link the individual influence process of self-leadership to work pressure, representing the first empirical research to do so. Through this linkage, we suggest a means by which the individual worker may deal with the external force of work pressure, thus decoupling the consequences of work pressure from the organizational influence. Through linking self-leadership to work pressure's effects, we examine how the individual may mitigate the negative work pressure-driven outcomes whereas past research has typically focused on what the organization may do to mitigate these effects. Finally, this study aims to disentangle an existing paradox in the self-leadership literature through examining how the various strategies of self-leadership perform differently under the context of work pressure

Self-Leadership: A Four Decade Review of the Literature and Trainings

This paper reviews the fourth decade of self-leadership research. Two previous reviews of self-leadership from 2006 and 2010 are summarized, and the paper applies categories from those reviews to examine recent research in the field. This paper also covers new topics and trends in self-leadership research. In previous review articles, new theoretical models for extending self-leadership models were proposed. Therefore, this paper continues that tradition by proposing a new model—the Meta-Performance Model—that offers self-leadership as a skillset for enhancing the individual performance of leaders who seek improvement through professional certification programs. Self-leadership and professional certification programs are often treated as a stand alone topics. However, this paper contends professionals would benefit from combining self-leadership training with other professional improvement programs

Self-Leadership: A Four Decade Review of the Literature and Trainings

This paper reviews the fourth decade of self-leadership research. Two previous reviews of self-leadership from 2006 and 2010 are summarized, and the paper applies categories from those reviews to examine recent research in the field. This paper also covers new topics and trends in self-leadership research. In previous review articles, new theoretical models for extending self-leadership models were proposed. Therefore, this paper continues that tradition by proposing a new model—the Meta-Performance Model—that offers self-leadership as a skillset for enhancing the individual performance of leaders who seek improvement through professional certification programs. Self-leadership and professional certification programs are often treated as a stand alone topics. However, this paper contends professionals would benefit from combining self-leadership training with other professional improvement programs

An Examination of the Effect of Exercise on Stress and Satisfaction for Entrepreneurs

In today’s society, health and fitness are given much publicity. Advertisements, magazine articles, and television shows trumpet the benefits of exercise and encourage people to undertake a fitness regimen. Indeed, it would make sense that an exercise program may lead to a less stressful and more productive life for the entrepreneur. However, busy schedules and the challenge of maintaining a fitness regimen lead many people to quit these programs soon after starting them and to return to their more sedentary lifestyles. This paper empirically examines whether spending time away from the business exercising is time well spent. To address this issue, we conducted a study of 472 small business owners and tested hypotheses on the role of exercise on stress and job satisfaction