University of California, Santa Cruz

About: University of California, Santa Cruz is a education organization based out in Santa Cruz, California, United States. It is known for research contribution in the topics: Galaxy & Population. The organization has 15541 authors who have published 44120 publications receiving 2759983 citations. The organization is also known as: UCSC & UC, Santa Cruz.

The protective role of coastal marshes: a systematic review and meta-analysis.

Abstract: Background Salt marshes lie between many human communities and the coast and have been presumed to protect these communities from coastal hazards by providing important ecosystem services. However, previous characterizations of these ecosystem services have typically been based on a small number of historical studies, and the consistency and extent to which marshes provide these services has not been investigated. Here, we review the current evidence for the specific processes of wave attenuation, shoreline stabilization and floodwater attenuation to determine if and under what conditions salt marshes offer these coastal protection services. Methodology/Principal Findings We conducted a thorough search and synthesis of the literature with reference to these processes. Seventy-five publications met our selection criteria, and we conducted meta-analyses for publications with sufficient data available for quantitative analysis. We found that combined across all studies (n = 7), salt marsh vegetation had a significant positive effect on wave attenuation as measured by reductions in wave height per unit distance across marsh vegetation. Salt marsh vegetation also had a significant positive effect on shoreline stabilization as measured by accretion, lateral erosion reduction, and marsh surface elevation change (n = 30). Salt marsh characteristics that were positively correlated to both wave attenuation and shoreline stabilization were vegetation density, biomass production, and marsh size. Although we could not find studies quantitatively evaluating floodwater attenuation within salt marshes, there are several studies noting the negative effects of wetland alteration on water quantity regulation within coastal areas. Conclusions/Significance Our results show that salt marshes have value for coastal hazard mitigation and climate change adaptation. Because we do not yet fully understand the magnitude of this value, we propose that decision makers employ natural systems to maximize the benefits and ecosystem services provided by salt marshes and exercise caution when making decisions that erode these services.

Capitalism, nature, socialism a theoretical introduction∗

Abstract: Summary This article expounds the traditional Marxist theory of the contradiction between forces and relations of production, over‐production of capital and economic crisis, and the process of crisis‐induced restructuring of productive forces and production relations into more transparently social, hence potentially socialist, forms. This exposition provides a point of departure for an “ecological Marxist”; theory of the contradiction between capitalist production relations and forces and the conditions of production, under‐production of capital and economic crisis, and the process of crisis‐induced restructuring of production conditions and the social relations thereof also into more transparently social, hence potentially socialist, forms. In short, there may be not one but two paths to socialism in late capitalist society. While the two processes of capital over‐production and underproduction are by no means mutually exclusive, they may offset or compensate for one another in ways which create the appe...

Ingroup Identification as the Inclusion of Ingroup in the Self

Abstract: This article presents a basic conceptualization of ingroup identification as the degree to which the ingroup is included in the self and introduces the Inclusion of Ingroup in the Self (IIS) measure to reflect this conceptualization. Using responses from samples of women and ethnic minority groups, four studies demonstrate the utility of this conceptualization of ingroup identification and provide support for the IIS. Results from these studies establish construct validity, concurrent and discriminant validity, and high degrees of test-retest reliability for the IIS. Reaction time evidence also is provided, supporting the use of the IIS as a measure of ingroup identification. Particular strengths of this conceptualization of ingroup identification and potential uses for the IIS are discussed.

The effect of galaxy mass ratio on merger-driven starbursts

Abstract: We employ numerical simulations of galaxy mergers to explore the effect of galaxy mass ratio on merger-driven starbursts. Our numerical simulations include radiative cooling of gas, star formation, and stellar feedback to follow the interaction and merger of four disc galaxies. The galaxy models span a factor of 23 in total mass and are designed to be representative of typical galaxies in the local universe. We find that the merger-driven star formation is a strong function of merger mass ratio, with very little, if any, induced star formation for large mass ratio mergers. We define a burst efficiency that is useful to characterize the merger-driven star formation and test that it is insensitive to uncertainties in the feedback parametrization. In accord with previous work we find that the burst efficiency depends on the structure of the primary galaxy. In particular, the presence of a massive stellar bulge stabilizes the disc and suppresses merger-driven star formation for large mass ratio mergers. Direct, coplanar merging orbits produce the largest tidal disturbance and yield the most intense burst of star formation. Contrary to naive expectations, a more compact distribution of gas or an increased gas fraction both decrease the burst efficiency. Owing to the efficient feedback model and the newer version of smoothed particle hydrodynamics employed here, the burst efficiencies of the mergers presented here are smaller than in previous studies.