Species–specific crab predation on the hydrozoan clinging jellyfish Gonionemus sp. (Cnidaria, Hydrozoa), subsequent crab mortality, and possible ecological consequences

© The Author(s), 2017. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in PeerJ 5 (2017): e3966, doi:10.7717/peerj.3966.Here we report a unique trophic interaction between the cryptogenic and sometimes highly toxic hydrozoan clinging jellyfish Gonionemus sp. and the spider crab Libinia dubia. We assessed species–specific predation on the Gonionemus medusae by crabs found in eelgrass meadows in Massachusetts, USA. The native spider crab species L. dubia consumed Gonionemus medusae, often enthusiastically, but the invasive green crab Carcinus maenus avoided consumption in all trials. One out of two blue crabs (Callinectes sapidus) also consumed Gonionemus, but this species was too rare in our study system to evaluate further. Libinia crabs could consume up to 30 jellyfish, which was the maximum jellyfish density treatment in our experiments, over a 24-hour period. Gonionemus consumption was associated with Libinia mortality. Spider crab mortality increased with Gonionemus consumption, and 100% of spider crabs tested died within 24 h of consuming jellyfish in our maximum jellyfish density containers. As the numbers of Gonionemus medusae used in our experiments likely underestimate the number of medusae that could be encountered by spider crabs over a 24-hour period in the field, we expect that Gonionemus may be having a negative effect on natural Libinia populations. Furthermore, given that Libinia overlaps in habitat and resource use with Carcinus, which avoids Gonionemus consumption, Carcinus populations could be indirectly benefiting from this unusual crab–jellyfish trophic relationship.This work was supported by the Oak Bluffs Community Preservation Committee under Grant 45908900; Oak Bluffs Community Preservation Committee under Grant 45785700; USGS-WHOI Cooperative Program under Grant 48010601, the Adelaide M. and Charles B. Link Foundation, and the Kathleen M. and Peter E. Naktenis Family Foundation

Improving Community Health through Hospital-Public Health Collaboration: Insights and Lessons Learned from Successful Partnerships

From the introduction: Health care expenditures in the United States currently consume over 17 percent of the nation’s gross domestic product, a much larger share than other developed nations. Yet, despite this large investment, studies by Commonwealth Fund, the Institute of Medicine, and other organizations show the USA lags behind other developed nations on multiple metrics of population health such as infant mortality and life expectancy. Moreover, there is extensive evidence of disparities in access, cost, and quality of health care services. Thus, we are confronted by a striking paradox: the USA spends a large and growing proportion of our resources on health care, but the outcomes in terms of access to services, the quality of those services, and the health of our population do not match other countries whose spending per capita is lower. It is evident that many factors contribute to this paradox — demographic, environmental, genetic, lifestyle, and socioeconomic — and all warrant societal attention. Improving access to outpatient and inpatient medical services and the quality of those services, while important, cannot resolve the paradox. Across the country, there is growing awareness that restraining the increase in health expenditures and improving the health status of families, communities, and society at large will require a broader approach that addresses the full array of factors affecting health status. Greater attention and resources must be devoted to promoting a safer environment, healthy lifestyles, prevention of illnesses and injuries, and early detection and treatment of health problems, as well as dealing with the underlying determinants of health. This approach necessitates integrating basic principles of public health into organizing and delivering health and medical services.https://uknowledge.uky.edu/hsm_book/1001/thumbnail.jp

Heidegger’s Underdeveloped Conception of the Undistinguishedness (Indifferenz) of Everyday Human Existence

This chapter provides an interpretation of the early Heidegger’s underdeveloped conception of the undistinguishedness of everyday human existence in Being and Time. After explaining why certain translation choices of some key terms in this text are interpretively and philosophically important, I first provide a concise argument for why the social constitution interpretation of the relation between ownedness and unownedness makes better overall sense of Heidegger’s ambivalent attitude toward the social constitution of the human being than the standard existentialist interpretation of this relation. I then proceed to the heart of this chapter, which develops his inchoate conception of the undistinguishedness of everydayness by arguing that it specifies the third distinctive mode of concrete human existence in addition to ownedness and unownedness. Accordingly, I show how unownedness is actually a generic phenomenon with two distinct species, namely, undistinguishedness and disownedness, which are at once closely related to, but also differ in significant respects from, each other. Consequently, instead of taking for granted a one-dimensional and mutually exclusive opposition between ‘authenticity’ and ‘inauthenticity’, I argue that we should adopt a two-dimensional and more nuanced understanding of the relations among undistinguishedness, disownedness, and ownedness that intersects with Heidegger’s underappreciated distinction between genuineness and ungenuineness. After raising and replying to some objections to this interpretation of undistinguishedness, I conclude this chapter by briefly sketching three of its philosophical consequences and pointing out its potential as an important resource for contemporary social theories

Squeezed light from spin squeezed atoms

We propose to produce pulses of strongly squeezed light by Raman scattering of a strong laser pulse on a spin squeezed atomic sample. We prove that the emission is restricted to a single field mode which perfectly inherits the quantum correlations of the atomic system.Comment: 5 pages, 2 figures, revtex4 beta

Morphogenetic responses of embryo culture of wheat related to environment culture conditions of the explant donor plant

Availability of immature embryos as explants to establish wheat (Triticum aestivum L.) by tissue culture can be limited by climatic factors and the lack of high quality embryos frequently hampers experimentation. This study evaluates the effects of rainfall, various temperature-based variables and sunshine duration on tissue culture response (TCR) traits including callus formation (CF), regenerating calli (RC), and number of plants per embryo (PPE) for 96 wheat genotypes of worldwide origin. The objectives of this study were to evaluate the significance of a particular climatic factor on TCR traits and to determine the period of wheat growth during which these factors were the most effective. The genotypes were grown in an experimental field during three seasons differing in meteorological conditions. The relationships between TCR traits and climatic factors within three time periods of wheat growth: 2, 6 and 10 weeks prior to embryo sampling were analysed by biplot analysis. The tissue culture traits were influenced at very different degrees by climatic factors: from 16.8% (RC) to 69.8% (CF). Donor plant environment with high temperatures and low rainfalls reduced (p lt 0.05) the tissue culture performance of wheat genotypes. Callus formation was most sensitive to the temperature based factors. The environmental conditions between flowering and the medium milk stage were the most important for CF, while RC and PPE were not particularly related to any period

2009 pandemic influenza A(H1N1) virus in Scotland : geographically variable immunity in Spring 2010, following the winter outbreak

We determined the age- and location-specific seroprevalence of antibodies against 2009 pandemic influenza A(H1N1) virus in Scotland following the first two waves of infection. Serum samples collected following the winter outbreak were analysed by microneutralisation assay. The proportion of positive sera varied significantly between cities and, in the case of Inverness, between age groups (with younger adults more likely to be positive than older individuals). This study demonstrates that older people are no longer more likely to have antibodies against the virus than younger adults