scholarly journals The intensity of kelp harvesting shapes the population structure of the foundation species Lessonia trabeculata along the Chilean coastline

2021 ◽  
Vol 168 (5) ◽  
Author(s):  
Adam Gouraguine ◽  
Pippa Moore ◽  
Michael T. Burrows ◽  
Eliana Velasco ◽  
Luis Ariz ◽  
...  

AbstractKelp are foundation species that support high levels of biodiversity and, either directly or indirectly provide a wide range of ecological goods and services to human society. In recent decades, due to the high demand for kelp-derived products such as alginate, commercial wild harvesting has increased, leading to declines of kelp biomass in some regions. Chile accounts for 40% of the global kelp harvest, with the subtidal kelp, Lessonia trabeculata being one of the main target species. Currently, however, there is a lack of information on how different degrees of harvesting intensity, governed by distinct management regimes and their enforcement influences L. trabeculata populations. Here we examined the effect different management regimes, characterised by distinct levels of exploitation of kelp and kelp-associated fauna, have on L. trabeculata density and morphology along ~ 1600 km of the Chilean coastline. The findings demonstrated that harvesting intensity likely influences both L. trabeculata density and morphology. Juvenile density of L. trabeculata was five times higher in the most harvesting-affected areas, while kelp morphology values, including holdfast diameter, number of stipes and total length, were always higher in the less-intensively harvested areas. Our study suggests that different degrees of protection can influence density and morphology of subtidal  L. trabeculata populations, which in turn has important implications for the conservation of the kelp forest ecosystems and management of this important fishery.

Axioms ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 59
Author(s):  
Bruno Carbonaro ◽  
Marco Menale

A complex system is a system involving particles whose pairwise interactions cannot be composed in the same way as in classical Mechanics, i.e., the result of interaction of each particle with all the remaining ones cannot be expressed as a sum of its interactions with each of them (we cannot even know the functional dependence of the total interaction on the single interactions). Moreover, in view of the wide range of its applications to biologic, social, and economic problems, the variables describing the state of the system (i.e., the states of all of its particles) are not always (only) the usual mechanical variables (position and velocity), but (also) many additional variables describing e.g., health, wealth, social condition, social rôle ⋯, and so on. Thus, in order to achieve a mathematical description of the problems of everyday’s life of any human society, either at a microscopic or at a macroscpoic scale, a new mathematical theory (or, more precisely, a scheme of mathematical models), called KTAP, has been devised, which provides an equation which is a generalized version of the Boltzmann equation, to describe in terms of probability distributions the evolution of a non-mechanical complex system. In connection with applications, the classical problems about existence, uniqueness, continuous dependence, and stability of its solutions turn out to be particularly relevant. As far as we are aware, however, the problem of continuous dependence and stability of solutions with respect to perturbations of the parameters expressing the interaction rates of particles and the transition probability densities (see Section The Basic Equations has not been tackled yet). Accordingly, the present paper aims to give some initial results concerning these two basic problems. In particular, Theorem 2 reveals to be stable with respect to small perturbations of parameters, and, as far as instability of solutions with respect to perturbations of parameters is concerned, Theorem 3 shows that solutions are unstable with respect to “large” perturbations of interaction rates; these hints are illustrated by numerical simulations that point out how much solutions corresponding to different values of parameters stay away from each other as t→+∞.


2018 ◽  
Vol 285 (1889) ◽  
pp. 20181441 ◽  
Author(s):  
E. Guiry ◽  
M. Buckley

Over the past 1000 years, rats ( Rattus spp.) have become one of the most successful and prolific pests in human society. Despite their cosmopolitan distribution across six continents and ubiquity throughout the world's cities, rat urban ecology remains poorly understood. We investigate the role of human foods in brown rat ( Rattus norvegicus ) diets in urban and rural areas over a 100 year period ( ca AD 1790–1890) in Toronto, Canada using stable carbon ( δ 13 C) and nitrogen ( δ 15 N) isotope analyses of archaeological remains. We found that rat diets from urban sites were of higher quality and were more homogeneous and stable over time. By contrast, in rural areas, they show a wide range of dietary niche specializations that directly overlap, and probably competed, with native omnivorous and herbivorous species. These results demonstrate a link between rodent diets and human population density, providing, to our knowledge, the first long-term dietary perspective on the relative value of different types of human settlements as rodent habitat. This study highlights the potential of using the historical and archaeological record to provide a retrospective on the urban ecology of commensal and synanthropic animals that could be useful for improving animal management and conservation strategies in urban areas.


2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Jürgen Bast

Dear readers, authors and colleagues, Technological progress plays an essential role in the development of human society. The increasing global population and its mobility, the expansion of urban areas, climate protection and the conservation of fossil resources present challenges that can only be overcome by the improvement of existing resources and the development of new components, materials and production processes. Conventional materials have quickly reached their limit as new mechanisms are developed. These fields of application require the supply of new materials working in aggressive environments at extreme temperatures and high stress. These new materials are also expected to automatically alert us when critical loads are reached to avoid accidents caused by failures. This is the first issue of the Ziggurat Journal of Materials Technology, and we hope that you are satisfied with the content. The title of the journal primarily suggests materials technology; however, we strive to present a broad range of topics, including questions about the interaction between design, material, manufacturing and energy. The efficient interaction between these parameters results in components that are optimally designed and economically feasible. The idea for this journal resulted from the editors' realisation of the large knowledge potential that is being developed at colleges and universities around the world by scholars and PhD students. These clients must have the opportunity to publish their work and get in touch with other scientists. We want to reach out to young researchers and encourage them to present their work to a wide range of readers. Furthermore, a scientific career today requires evidence of publications that withstand the corresponding assessments of specialist colleagues and meet the criteria of good scientific work. In this context, the submitted articles will be subjected to a strict review. The principal objective is not to criticise work but rather to provide advice on how to improve the quality of the work presented. With this in mind, we would like to invite you to submit articles and use this journal as a reference for your ongoing scientific work.


Author(s):  
O. M. Byndas ◽  

This article deals with the problem of relationships among people in the future, which are based not on respect and understanding of each other's value, but on absolute dependence on technical progress. The purpose of this work is to highlight the problem of humanity’s tragedy in the genre of science fiction, using the example of Ray Bradbury’s works „Tomorrow's Child” and „The Veldt”. Firstly, it is noted that the difference and, accordingly, the problem begins immediately with terminology, because there is no single stable definition of the term „fantasy” (as a generic phenomenon) in English-language science. The options offered by scientists are speculative fiction, fantastic fiction, fantasy literature. The author notes that science fiction (Sci-Fi) describes many different super important problems of the human society: technological progress, information wars, the desire of people to be immortal, powerful, rich, possessing the Universe. In fact, the tragedy of humanity begins from these desires. However, R. Bradbury’s works „Tomorrow's Child” and „The Veldt” have a wide range of topics, affecting aesthetic, intellectual, moral and scientific problems. In addition, the science fiction writer reveals his special interest in the inner world of the child. In the mentioned-above stories, the idea of the coexistence of people and the techno world is traced, which leads to a tragic situation. Covering the problem of humanity’s tragedy in the future, described back in the distant 1950s, R. Bradbury aims to present another idea of the future, he describes, at the same time, possible threats to us, and shows what significant consequences this can lead to.


Author(s):  
S. Zlatanova ◽  
S. Dragicevic ◽  
G. Sithole

Abstract. The unusual circumstances created by the coronavirus pandemic has impacted recent activities of Commission IV. The situation also provides an excellent opportunity to connect the work of the Commission to addressing an important global problem. Managing the social and economic challenges brought by increased complexity and interconnectivity of activities in human society requires new dimensions of analysing information and specifically spatial information. The increased pressure on the usage of geographic space, maintaining sustainable development and creating liveable community environments increases the requirements for spatial decision-making tools. Commission IV Spatial Information Science (2016–2020) is dedicated to advance research activities in spatial information sciences for modelling, structuring, management, analysis, visualization and simulation of (big) data with focus on the third spatial dimension and taking into consideration dynamic changes. Special attention is given to linking information about real-world physical phenomena with societal, organizational and legal information in order to address the complexity of issues in their entirety. The Commission has contributed to advancements in data modelling, data fusion and management, visualization (web-based, VR and AR), simulation and city analytics, and 3D applications. The work had largely been implemented in cooperation with international organizations such as FIG, UDMS, 3DGeoinfo, ICA, OGC, ISO and Web3D.The Commission consists of 10 scientific areas of research that is coordinated by 10 working groups (WG) as follows - WG1: Strengthen the work on multidimensional spatial model and representations towards seamless data fusion; WG2: Advance the semantic modelling, development and linking of ontologies; WG3: Intensify research into data interpretation, quality and uncertainty modelling; WG4: Strengthen research on crowdsourced data and public participation, towards community-driven and participatory applications, collaborative mapping and use/usability of maps; WG5: Strengthen research on seamless indoor/outdoor location-based services, navigation and tracking, and analysis of human movement; WG6: Advance interoperable Internet of Things, Sensor web, SDI and linked data; WG7: Advance research on spatial data types, indexing methods and analysis to further contribute to development of spatial DBMS for management and analysis of multi-dimensional data; WG8: Encourage the use of functional programming and streaming algorithms in development of demos and applications as well as parallel and distributed processing paradigms; WG9: Advance visual analytics, online multi-dimensional visualization on mobile and desktop devices, considering human-centred applications, privacy and security issues; WG10: Advance knowledge on the use of spatial information (BIM/GIS) for urban modelling; ICWG IV/III: Global Mapping: Updating, Verification and Interoperability with the mission to promote the development of advanced methodologies and applications for the update, verification and interoperability of geospatial databases.The papers received for the ISPRS congress reflect the above-mentioned scientific research areas. The reported research ranges from advancements in new and emerging theories, through experiments and analysis to demonstration of technologies in different applications. The research was captured through papers and abstracts published in the collection of ISPRS Annals and ISPRS Archives. The papers and abstracts were selected for inclusion through a rigorous peer-review process. The ISPRS Annals contain 29 papers and the ISPRS Archives contain 114 papers. The diversity of the research topics presented in the published papers clearly indicate the wide range of topics within the field of Spatial Information Science. A rigorous peer-review process by the ISPRS TC IV Scientific Committee Working Group Chairs ensured hight quality and scientific innovation.


2020 ◽  
Vol 4 (3) ◽  
pp. 49-57
Author(s):  
Oleksandra Fedorenko

Introduction. Modern retail integrates the development of goods and services, their production, sale, exchange and consumption into a global network and is a basis for an accelerated development of services and trade. Network retailers offer consumers not only a wide range of goods and services, but also the opportunity to buy everything in one place, where a large retail space offers up to hundreds of thousands of items. It is network retail that has a purposeful impact not only on the economy of an individual country, but also on global economic processes. The aim of the article is to study the theoretical aspects and develop practical recommendations for improving the analytical efficiency of network retail. Results. The article examines approaches to the disclosure of the economic category of "retail". The state and peculiarities of the development of domestic network retail, problems and difficulties of their functioning are analyzed. It is determined that the development of network retail requires professional and quality retail branding, which is a complex category and includes the process of brand development for the retail network and includes components: marketing research; internal audit; creation of a unique logo of a retail trade network; development of the spatial environment of the retail trade network. The method of the analysis of activity of the network retailer in particular the complex comparative analysis of the network retail in the dynamic competitive environment is offered and the balanced system of indicators of the analysis of activity of the network retail is offered. Conclusions. The development of online retail creates new opportunities for business through the introduction of modern information systems, digitalization of production processes and business, the creation of e-shops and interactive storefronts. The activity of network retail, like any other enterprise, requires a qualitative and comprehensive analysis in order to strengthen its position in the market, a stable position in a competitive environment. Therefore, business owners, executives, senior managers and potential investors and business partners should pay significant attention to the analytical support of the effective operation of the network retailer in order to manage business, finance and further increase profitability.


2010 ◽  
pp. 258-266
Author(s):  
Sonia Dahab ◽  
Filipe Amaral

The production of a good or service frequently requires that the supplier performs a wide range of activities. The coordination between those activities implies that the firm must determine its boundaries, which means that it must define the supply chain activities that will be performed internally, and those that will be trusted to external suppliers. The process of obtaining goods and services from outside suppliers, instead of developing them within the organization, is called outsourcing (Anderson & Naurus, 1991).


Author(s):  
Stefan Schwarzkopf

In both premodern and modern capitalist societies, marketing emerged as a key driver behind consumption patterns and as a facilitator of new consumer goods and services. This chapter uses historical case studies to highlight how marketing and consumption practices co-developed over time and in response to socioeconomic and technological changes. The historical evidence shows that marketing activities have never followed a narrow economic and utilitarian calculus; instead, they have always existed within and helped to maintain a wide range of relations between businesses, consumers, cultural intermediaries, and lawmakers. A key tension that runs through the history of marketing and consumption is the coexistence of efforts to control consumer behavior and attempts to provide consumers with the space needed to create entirely new kinds of consumption experiences.


Author(s):  
Neil C. Rowe

Deception is a frequent but under appreciated aspect of human society (Eckman, 2001). Deception in electronic goods and services is facilitated by the difficulty of verifying details in the limited information available in cyberspace (Mintz, 2002). Fear of being deceived (often unjustified) is in fact a major obstacle to wider use of e-commerce and e-government by the public. One survey reported consumers thought fraud on the Internet was 12 times more common than offline fraud, and 3 out of 5 people thought their credit card number could be stolen in most online transactions (Allen, 2001); both are overestimates. We assess here the nature of the deception threat, how deception can be detected, and what can be done about it.


Author(s):  
Lee Artz

Cultural studies seeks to understand and explain how culture relates to the larger society and draws on social theory, philosophy, history, linguistics, communication, semiotics, media studies, and more to assess and evaluate mass media and everyday cultural practices. Since its inception in 1960s Britain, cultural studies has had recognizable and recurring interactions with Marxism, most clearly in culturalist renderings along a spectrum of tensions with political economy approaches. Marxist traditions and inflections appear in the seminal works of Raymond Williams and E. P. Thompson, work on the culture industry inspired by the Frankfurt School in 1930s Germany, challenges by Stuart Hall and others to the structuralist theories of Louis Althusser, and writings on consciousness and social change by Georg Lukács. Perhaps the most pronounced indication of Marxist influences on cultural studies appears in the multiple and diverse interpretations of Antonio Gramsci’s concept of hegemony. Cultural studies, including critical theory, has been invigorated by Marxism, even as a recurring critique of economic determinism appears in most investigations and analyses of cultural practices. Marxism has no authoritative definition or application. Nonetheless, Marxism insists on materialism as the precondition for human life and development, opposing various idealist conceptions whether religious or philosophical that posit magical, suprahuman interventions that shape humanity or assertions of consciousness, creative genius, or timeless universals that supersede any particular historical conjuncture. Second, Marxism finds material reality, including all forms of human society and culture, to be historical phenomenon. Humans are framed by their conditions, and in turn, have agency to make social changing using material, knowledge, and possibilities within concrete historical conditions. For Marxists, capitalist society can best be historically and materially understood as social relations of production of society based on labor power and capitalist private ownership of the means of production. Wages paid labor are less than the value of goods and services produced. Capitalist withhold their profits from the value of goods and services produced. Such social relations organize individuals and groups into describable and manifest social classes, that are diverse and unstable but have contradictory interests and experiences. To maintain this social order and its rule, capitalists offer material adjustments, political rewards, and cultural activities that complement the social arrangements to maintain and adjust the dominant social order. Thus, for Marxists, ideologies arise in uneasy tandem with social relations of power. Ideas and practices appear and are constructed, distributed, and lived across society. Dominant ideologies parallel and refract conflictual social relations of power. Ideologies attune to transforming existing social relations may express countervailing views, values, and expectations. In sum, Marxist historical materialism finds that culture is a social product, social tool, and social process resulting from the construction and use by social groups with diverse social experiences and identities, including gender, race, social class, and more. Cultures have remarkably contradictory and hybrid elements creatively assembled from materially present social contradictions in unequal societies, ranging from reinforcement to resistance against constantly adjusting social relations of power. Five elements appear in most Marxist renditions on culture: materialism, the primacy of historical conjunctures, labor and social class, ideologies refracting social relations, and social change resulting from competing social and political interests.


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