Assessing the safe operating space of aquatic macrophyte biomass to control the terrestrialization of a grass-type shallow lake in China

2020 ◽  
Vol 266 ◽  
pp. 110479 ◽  
Author(s):  
Junhong Bai ◽  
Yanan Guan ◽  
Peipei Liu ◽  
Ling Zhang ◽  
Baoshan Cui ◽  
...  
Keyword(s):  
Shallow Lake ◽  
Aquatic Macrophyte ◽  
Operating Space ◽  
Macrophyte Biomass ◽  
Safe Operating

Interactions between a planktivorous fish and planktonic microcrustaceans mediated by the biomass of aquatic macrophytes

2021 ◽  
Author(s):  
Bárbara Angélio Quirino ◽  
Franco Teixeira de Mello ◽  
Sabrina Deosti ◽  
Claudia Costa Bonecker ◽  
Ana Lúcia Paz Cardozo ◽  
...  
Keyword(s):  
Aquatic Macrophyte ◽  
Plant Biomass ◽  
Flow Speed ◽  
Trophic Niche ◽  
Planktivorous Fish ◽  
Low Flow ◽  
High Biomass ◽  
Predator Prey ◽  
Cladoceran Species ◽  
Macrophyte Biomass

Abstract Habitat complexity is recognized to mediate predator–prey relationships by offering refuge or not. We investigated the availability of planktonic microcrustaceans and the diet of a planktivorous fish (Hyphessobrycon eques) at different levels (low, intermediate and high) of aquatic macrophyte biomass. Sampling was carried out in a river with low flow speed, located in a Neotropical floodplain. We collected fish and microcrustaceans in macrophyte stands with variations in biomass. There were no differences in microcrustacean density in the water among the levels of macrophyte biomass, but microcrustacean richness and diet composition of H. eques differed. Microcrustacean richness and trophic niche breadth of the planktivorous fish were higher in high biomass stands. There was high consumption of a small cladoceran species in low macrophyte biomass, which was replaced by larger species, such as copepods, in intermediate and high biomass. Thus, the selection of some species was different among the biomass levels. These results suggest that plant biomass plays an important role in the interaction between fish and microcrustaceans, and prey characteristics such as size, escape ability and energy value make them more or less subject to predation by fish according to habitat structuring.

A digital contract for restoration of the Earth System mediated by a Planetary Boundary Exchange Unit

2021 ◽  
pp. 205301962098727
Author(s):  
Orfeu Bertolami ◽  
Frederico Francisco
Keyword(s):  
Earth System ◽  
New Governance ◽  
Validation Process ◽  
Operational Conditions ◽  
Blockchain Technology ◽  
The Earth ◽  
Optimal Functioning ◽  
Operating Space ◽  
Exchange Unit ◽  
Safe Operating

In this paper, we propose a new governance paradigm for managing the Earth System based on a digital contract inspired on blockchain technology. This proposal allows for a radical decentralisation of the procedures of controlling, maintaining and restoring ecosystems by a set of networks willing to engage in improving the operational conditions of local ecosystems so to contribute to an optimal functioning of the Earth System. These procedures are aimed to improve local Planetary Boundary parameters so that they approach the optimal Holocene reference values, the so-called Safe Operating Space, via a reciprocal validation process and an exchange unit that internalises the state of the Earth System.

scholarly journals Aboriginal Tourism as Sustainable Social-Environmental Enterprise (SSEE): A Tlingit Case Study from Southeast Alaska

2015 ◽  
Vol 6 (4) ◽  
Author(s):  
Paphaphit Wanasuk ◽  
Thomas F Thornton
Keyword(s):  
Cultural Economic ◽  
Southeast Alaska ◽  
Operational Strategies ◽  
Cultural Sustainability ◽  
Operating Space ◽  
Social Environmental ◽  
Short Time ◽  
Safe Operating ◽  
Dominant Influence

The Tlingit Aboriginal tourism enterprise named Icy Strait Point in Hoonah, Southeast Alaska is used as a case study to develop the new concept of Sustainable Social-Environmental Enterprise (SSEE). SSEE is defined as an innovative enterprise that has dynamic operational strategies while still maintaining its corporate core values and integrating social, environmental, cultural, economic and political (SECEP) sustainabilities in its operations. The SSEE framework assesses enterprises according to five domains of sustainability: social, environmental, cultural, economic, and political. Applying this framework, we find that while social, economic, and cultural sustainability goals have been achieved in a relatively short time by the Aboriginal tourism enterprise in Hoonah, the political and environmental spheres of sustainability are constrained by the dominant influence of the multinational cruise ship industry over tourism development. Thus, for an emerging tourism enterprise to be sustainable, we suggest each of these livelihood dimensions needs to achieve "a safe operating space" that is adaptable over time and to changing social and environmental circumstances.

scholarly journals Planetary Boundaries: Exploring the Safe Operating Space for Humanity

2009 ◽  
Vol 14 (2) ◽  
Author(s):  
Johan Rockström ◽  
Will Steffen ◽  
Kevin Noone ◽  
Åsa Persson ◽  
F. Stuart III Chapin ◽  
...  
Keyword(s):  
Planetary Boundaries ◽  
Operating Space ◽  
Safe Operating

scholarly journals Food for thought: pretty good multispecies yield

2016 ◽  
Vol 74 (2) ◽  
pp. 475-486 ◽  
Author(s):  
Anna Rindorf ◽  
Catherine Mary Dichmont ◽  
Phillip S. Levin ◽  
Pamela Mace ◽  
Sean Pascoe ◽  
...  
Keyword(s):  
Fisheries Management ◽  
Single Species ◽  
Maximum Sustainable Yield ◽  
Social Benefits ◽  
Sustainable Yield ◽  
Average Yield ◽  
Operational Management ◽  
Operating Space ◽  
Management Advice ◽  
Safe Operating

Abstract MSY principles for marine fisheries management reflect a focus on obtaining continued high catches to provide food and livelihoods for humanity, while not compromising ecosystems. However, maintaining healthy stocks to provide the maximum sustainable yield on a single-species basis does not ensure that broader ecosystem, economic, and social objectives are addressed. We investigate how the principles of a “pretty good yield” range of fishing mortalities assumed to provide >95% of the average yield for a single stock can be expanded to a pretty good multispecies yield (PGMY) space and further to pretty good multidimensional yield to accommodate situations where the yield from a stock affects the ecosystem, economic and social benefits, or sustainability. We demonstrate in a European example that PGMY is a practical concept. As PGMY provides a safe operating space for management that adheres to the principles of MSY, it allows the consideration of other aspects to be included in operational management advice in both data-rich and data-limited situations. PGMY furthermore provides a way to integrate advice across stocks, avoiding clearly infeasible management combinations, and thereby hopefully increasing confidence in scientific advice.

Fluoride removal from aqueous solution by Ca-pretreated macrophyte biomass

2008 ◽  
Vol 5 (1) ◽  
pp. 68 ◽  
Author(s):  
Patricia Miretzky ◽  
Carolina Muñoz ◽  
Alejandro Carrillo-Chávez
Keyword(s):  
Aqueous Solution ◽  
Developing Countries ◽  
Drinking Water ◽  
Sorption Capacity ◽  
Aquatic Macrophyte ◽  
Low Cost ◽  
Isotherm Models ◽  
Fluoride Removal ◽  
Natural Material ◽  
Macrophyte Biomass

Environmental context. Fluoride concentrations in drinking water above 1.5 mg L–1 may be detrimental to human health. Many methods have been developed for removing excessive fluoride from drinking water. The use of an aquatic macrophyte biomass (Eleocharis acicularis) pretreated with Ca2+, a low-cost natural material, could be a technique for rural populations in developing countries that cannot afford treated or bottled water for daily consumption. Abstract. The use of an aquatic macrophyte biomass (Eleocharis acicularis) pretreated with Ca2+ as a low-cost natural material for the removal of fluoride from aqueous solution was studied. Batch experiments were carried out to determine fluoride sorption capacity and the efficiency of the sorption process under different pH, initial F– and macrophyte biomass doses. The experimental data showed good fitting to Langmuir and Freundlich isotherm models. The maximum F adsorption capacity was 0.110 mmol g–1 with an efficiency of 64.5% (pH 6.0; 5.0 g L–1 Ca-pretreated biomass). The binding of Ca2+ to the biomass increased the removal efficiency over 100%. The F– removal kinetics were rapid, less than 30 min, and best described by the pseudo-second order rate model. The rate constant, the initial sorption rate and the equilibrium sorption capacity were determined. These results may be useful for deprived rural population water supply schemes in Mexico and in other developing countries.

scholarly journals Social Policy Without Growth: Moving Towards Sustainable Welfare States

2021 ◽  
pp. 1-13
Author(s):  
Max Koch
Keyword(s):  
Social Policy ◽  
Welfare States ◽  
Social Ecological ◽  
Role Of The State ◽  
Production And Consumption ◽  
Operating Space ◽  
Historical Role ◽  
Environmental Limits ◽  
Safe Operating

Growth-dependent welfare states contribute to climate emergency. The ecological economics, degrowth, and sustainable welfare literatures demonstrate that to re-embed Western production and consumption patterns in environmental limits, an encompassing social-ecological transformation would need to be initiated very soon. This article focuses on the potential roles of the welfare state and social policy in this transformation, applying the concepts of ‘sustainable welfare’ and ‘safe-operating space’. Based on two Swedish studies, it also provides an empirical analysis of the popularity of selected eco-social policies designed to steer the economy and society towards this space: maximum and basic incomes, taxes on wealth and meat, as well as working time reductions. In analogy to the historical role of the state in reconstituting the welfare-work nexus in the post-WWII era and its present engagement in the context of the Covid-19 crisis, it is argued that a more interventionist state is required to grapple with climate emergency.

Sign in / Sign up

Export Citation Format

Share Document