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| 2. |
- Goddek, Simon, et al.
(författare)
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Aquaponics and Global Food Challenges
- 2019
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Ingår i: Aquaponics Food Production Systems. - : Springer Verlag. - 9783030159436
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Bokkapitel (refereegranskat)
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| 3. |
- Goddek, Simon, et al.
(författare)
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Decoupled aquaponic systems
- 2019
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Ingår i: Aquaponics Food Production Systems. - London : Springer. - 9783030159436
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Bokkapitel (refereegranskat)
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| 4. |
- Goddek, Simon, et al.
(författare)
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How greenhouse horticulture in arid regions can contribute to climate-resilient and sustainable food security
- 2023
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Ingår i: GLOBAL FOOD SECURITY-AGRICULTURE POLICY ECONOMICS AND ENVIRONMENT. - 2211-9124. ; 38
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Tidskriftsartikel (refereegranskat)abstract
- A potential change in climate and temperature could strongly affect weather-related crop losses. Using wastelands to grow crops in controlled greenhouse environments could improve global food security and preserve ecosystems. However, the impact of climate change on additional energy and water requirements of greenhousehorticulture food production is still unknown. Using a greenhouse simulator for four locations (The Netherlands, Spain, Saudi Arabia and Namibia), we show that a rise in outdoor temperatures can be counterbalanced with a more intensive water-based cooling. Between 6.9% and 17.9%, more water is required in the worst-case scenario in the year 2100, while the yield quantity decreases by 3%-6% due to slightly deteriorating growth conditions within the greenhouse. Since cooling systems consume up to 90% of the total water use in desert greenhouses, saltwater cooling could play an essential role in increasing the efficiency and sustainability of greenhouse horticulture systems in arid regions. In this study, we investigate the economic and technical feasibility of such greenhouse systems on a larger scale and show the massive potential of these systems. The developed scenarios demonstrate considerable climate resilience, enabling the cultivation of fresh vegetables in arid and infertile regions both presently and in the future.
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| 5. |
- Goddek, S., et al.
(författare)
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Nutrient mineralization and organic matter reduction performance of RAS-based sludge in sequential UASB-EGSB reactors
- 2018
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Ingår i: Aquacultural Engineering. - : Elsevier BV. - 0144-8609 .- 1873-5614. ; 83, s. 10-19
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Tidskriftsartikel (refereegranskat)abstract
- There is a recognized need for mineralizing aquaculture-derived sludge in aquaponics systems in order to reduce waste production. Many recent studies of aquacultural waste treatment have focused only the production of biogas as opposed to the potential for mineralization of nutrient-rich sludge. Upflow anaerobic sludge blanket (UASB) reactors provide one possible solution for breaking down sludge into bioavailable nutrients that can subsequently be delivered to plants. As such, this study examines the mineralization performance of sequential UASB reactors that are designed with an expanded granular sludge bed (EGSB) and compared to standard aerobic and anaerobic batch reactors. Results of our experiments demonstrate that only chemical oxygen demand reduction is significantly different. An unexpected drop in pH of one of the three reactor systems revealed that a pH below 6 was able to significantly increase the mineralization and mobilization of nutrients. Approximately 25% of phosphorus, potassium, and calcium could also be recovered from the sludge under lower pH conditions, as compared to the mineralization performance of standard UASB reactors running at a higher pH. However, the opposite effect was observed with respect to organic sludge reduction, where diminished performance was observed in the low-pH reactor. The current study implies that anaerobic reactors operating at low pH can potentially contribute towards improved nutrient recovery in multi-loop aquaponics systems and reduction of additive agents for pH control of the hydroponic subsystem. © 2018 Elsevier B.V.
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| 6. |
- Horn, Erin Kelly, et al.
(författare)
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Translating Environmental Potential to Economic Reality: Assessment of Commercial Aquaponics through Sustainability Transitions Theory
- 2024
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Ingår i: Circular Economy and Sustainability. - 2730-597X .- 2730-5988. ; 4:1, s. 523-554
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Tidskriftsartikel (refereegranskat)abstract
- Despite popular interest and recent industry growth, commercial-scale aquaponics still faces economic and regulatory barriers primarily resulting from political and economic systems which insufficiently address pressing environmental challenges. The sustainability potential of aquaponic food production can help address and overcome such challenges while contributing to the broader development of circular economy and sustainable development of food systems. In response to the current counterproductive gap between potential applications and industry development, the interdisciplinary team of authors identifies pathways to translate the environmental potential of commercial aquaponics into economic success through a sustainability transition theory lens. To evaluate the industry’s current state-of-the-art, drivers, barriers, and future potential, interview data from 25 North American producers collected in 2021, literature, and policy are analyzed through a Technological Innovation System (TIS) assessment within a Multi-Level Perspective (MLP) approach. This supports the consideration of pathways for industry development of aquaponics as an aspect of circular economy within a dynamic sustainable development context. These pathways for action include (1.) advancing clear standards and policies for aquaponics as part of a circular economy, increasing funding and incentives, and reducing support and subsidies for competing unsustainable food production; (2.) developing and promoting cost-effective technologies; and (3.) bolstering consumer preferences for sustainable and healthy food sources.
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| 9. |
- Joyce, Alyssa, et al.
(författare)
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Experimental effects of temperature and photoperiod on synchrony of gametogenesis and sex ratio in the European oyster Ostrea edulis (Linnaeus)
- 2013
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Ingår i: Journal of Shellfish Research. - : National Shellfisheries Association. - 0730-8000 .- 1943-6319. ; 32:2, s. 447-458
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Tidskriftsartikel (refereegranskat)abstract
- Insufficient knowledge about physiological processes underpinning reproduction in the European flat oyster, Ostrea edulis (Linnaeus), presents a number of unique challenges when designing a large-scale selective breeding program for hatchery production. The European flat oyster is a larviparous, protandric hermaphrodite wherein asynchronous spawns and variable sex ratios can lead to loss of genetic diversity and inbreeding depression within hatchery populations as a result of disproportionate gametic contributions in mass matings. A better understanding of O. edulis physiology in relation to environmental factors has the potential to improve hatchery processes for synchronization of gametogenesis, thus increasing fertilization potential and maximizing breeding population size of broodstock. This study sought to determine whether specific conditioning procedures-notably, manipulation of temperature and photoperiod-could be used to improve synchrony of gametogenesis and predictability of sex ratios in O. edulis. Two trials of accelerated yearly variations of temperature and photoperiod were conducted to uncouple the specific role of these factors in the timing of gametogenesis and sex of gametes over several spawning cycles. Histological analysis and quantitative analysis of gonad using a gonad filling index allowed for determination of sex ratios and staging of gametogenesis. Temperature was a controlling factor, although experimental results suggested that the effects of photoperiod, uncoupled from temperature, had no effect on the timing or rate of gametogenesis, or on sex ratios during a breeding season. A better understanding of factors affecting sex ratio and synchrony in timing of gamete release will allow for improved conditioning and broodstock handling protocols in the selective breeding of O. edulis.
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| 10. |
- Joyce, Alyssa, et al.
(författare)
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Molluscan bivalve settlement and metamorphosis: Neuroendocrine inducers and morphogenetic responses
- 2018
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Ingår i: Aquaculture. - : Elsevier BV. - 0044-8486. ; 487, s. 64-82
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Tidskriftsartikel (refereegranskat)abstract
- Surprisingly little is known about the nature and function of neurohormones in molluscs despite the fact that many of the neurotransmitters, including serotonin, catecholamines and estrogenic compounds that regulate reproduction in humans are also found in bivalve molluscs. Although mammalian and fish sex neurotransmitters have been comparatively well-studied, their role in molluscs is an emerging field where recent molecular and genetic research reveals an increasingly nuanced understanding of neuroendocrine pathways and morphogenetic processes. This knowledge is important in eco-toxicology given the prevalence of anthropogenic pollutants such as pharmaceuticals in wastewater, as well as pesticides and insecticides that are known to interfere with neuroendocrine signalling in a wide range invertebrate and vertebrate species. Knowledge of these pathways in molluscs is also important when developing anti-fouling compounds for marine applications. In the last few decades, the use of chemical inducers in bivalve aquaculture has transformed hatchery technology not only by increasing survival rates at metamorphosis, but also by using neurohormones to create ‘cultchless’ or ‘single-seed’ spat in some species (e.g. oysters) to bypass normal pathways that involve attachment to a substrate. Hatchery protocols for inducing settlement and metamorphosis with a range of chemical inducers in commercial shellfish species have been developed primarily from empirical studies based on trial and error, but such an approach is not reliably effective in all species, and trial and error is particularly time-consuming when developing protocols for new species. During the transition from larval to juvenile to adult life stages, neuroendocrine and immune functions mediate complex metabolic processes, and recent research on hematopoiesis, immune-competence, neuroendocrine pathways and gene regulation give insights into these complexities. In this review, we provide a current overview of research regarding the neuroendocrine basis for physiological mechanisms involved in bivalve settlement and metamorphosis, given it is a period when hatcheries often experience the greatest losses. Despite a plethora of empirical studies on specific species, the processes and neurotransmitters involved are surprisingly not well explored. We focus on metamorphosis as a key developmental period by highlighting some of the most promising new research in this area, with a focus on the value of these insights for commercial applications in aquaculture. © 2018 The Authors
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