Eksperimenter og politologisk forskning: Muligheder og begrænsninger

Nielsen, Julie Hassing

doi:10.7146/politik.v17i3.27586

Cited by 3 publications

(4 citation statements)

References 21 publications

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“…It should be noted that even though the general consensus is that Mytilus prefers to settle and thrive on hard or filamentous substrates, it is also common in Denmark to find Mytilus beds on soft bottom substrates in sheltered or deep areas with low physical exposure (Nielsen et al 2015). The findings in this paper therefore reflect the challenges when establishing beds at shallow locations with exposure to wave impacts, which are prevalent in many coastal areas.…”

Section: Discussionmentioning

confidence: 99%

“…Based on landing records of Mytilus edulis the estuary historically had a large population with yearly landings between 640 and 7240 t/year in the period 1994–1999 (data from the Danish Fisheries Agency). Landings have since decreased due to new regulations (Nielsen et al 2015) and presumably a decrease in the population of Mytilus . Since 2017, the commercial fishery after Mytilus has not been conducted within the estuary.…”

Section: Methodsmentioning

confidence: 99%

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Dislodgement and mortality challenges when restoring shallow mussel beds (Mytilus edulis) in a Danish estuary

Banke,

Steinfurth,

Lange

et al. 2024

Restoration Ecology

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In recent decades, mussel beds in the northern Atlantic and Scandinavia have declined rapidly in extent due to anthropogenic impacts, similar to many other marine habitats. In this study, a large‐scale restoration experiment was conducted to identify major challenges that arise during restoration efforts on shallow subtidal mussel beds. Suspension‐grown mussels (Mytilus edulis) were relayed in two different treatments either directly on bare bottom sandy sediments, or on coir nets (Net), used as a proxy for suitable byssal attachment substrate. The treatments were monitored for 1.5 years and coverage (%), biomass (WW), and population dynamics were quantified. Two main challenges of shallow bed restoration were identified: (1) Lack of suitable attachment substrate resulting in dislodgment of individuals during storm events. The Net treatment had significantly higher coverage and biomass of Mytilus at the end of the monitoring period, clearly demonstrating the importance of suitable substrate at physically exposed locations. (2) High mortality of juvenile mussels. Population dynamics revealed a high mortality of juvenile Mytilus, which resulted in almost complete loss of relayed Mytilus individuals less than 30 mm within the first season. This was most likely due to high meso‐predator densities, as a result of declining top‐predator populations. The high mortality of juvenile Mytilus prevented successful annual recruitment, thereby making the population unsustainable long‐term. Both challenges need to be addressed to create stable beds during restoration. Additionally, the experiment demonstrated the viability of using suspension‐grown Mytilus as a seed‐source when restoring mussel beds.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Dislodgement and mortality challenges when restoring shallow mussel beds (Mytilus edulis) in a Danish estuary

Banke,

Steinfurth,

Lange

et al. 2024

Restoration Ecology

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“…Another study in Australia indicated that building defects contribute 4% of the total construction costs [2]. In 2004, a study in Denmark showed that reworking building defects cost about 1.6 billion euro, which was 10% of the sector's turnover [3]. According to SINTEF, the cost of repairing building defects in Norway accounts for between 2% and 6% of the annual capital invested in new buildings [4].…”

Section: Introductionmentioning

confidence: 99%

Lessons Learned from Different Types of Building Defect Information Sources

Berg Oppedal,

Kvande

2024

Preprint

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Building defects are very prevalent and contribute significantly to a building's economic value. There are numerous information sources on building defects that have a lot potential for learning more about building defects. This study aimed to identify the information sources used in previous building defect studies and to identify the motivation for carrying out such studies. To fulfil this aim a scoping study was carried out. The information sources identified included insurance companies, private databases, questionnaire surveys, lawsuits, building surveys, client complaint forms, and maintenance reports. This study found that insurance company and client complaint forms include the largest collection of real building defect cases, but such databases may lack detailed descriptions of the causes of the defects. The main purposes of building defects studies identified here included design challenges, identification of defects, building maintenance management, quality management, systematization in data collection, providing an overview of typical defects, and classifying defects. Identification was found to be the most common purpose, indicating that the industry wants to learn more. This study identified research gaps in the climate perspective in relation to building defects. Most of the studies focused on the economical perspective, and none focused on the carbon footprint perspective.

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“…Another study in Australia indicated that building defects contribute 4% of the total construction costs [2]. In 2004, a study in Denmark showed that reworking building defects cost about EUR 1.6 billion, which was 10% of the sector's turnover [3]. According to SINTEF, the cost of repairing building defects in Norway accounts for between 2% and 6% of the annual capital invested in new buildings [4].…”

Section: Introductionmentioning

confidence: 99%

Lessons Learned from Information Sources on Building Defect Studies

Berg Oppedal,

Kvande

2024

Buildings

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Building defects are very prevalent and contribute significantly to a building’s economic value. There are numerous information sources on building defects that have significant potential for learning more about building defects. This study aimed to identify the information sources used in previous building defect studies and to identify the motivation for carrying out such studies. To fulfil this aim, a scoping study was carried out. The information sources identified included insurance companies, private databases, questionnaire surveys, lawsuits, building surveys, client complaint forms, and maintenance reports. This study found that insurance company and client complaint forms include the largest collection of real building defect cases, but such databases may lack detailed descriptions of the causes of the defects. The main purposes of building the defects studies identified here included design challenges, identification of defects, building maintenance management, quality management, systematization in data collection, providing an overview of typical defects, and classifying defects. Identification was found to be the most common purpose, indicating that the industry wants to learn more. This study identified research gaps in the climate perspective in relation to building defects. Most of the studies focused on the economical perspective, and none focused on the carbon footprint perspective. This study provides an overview of information sources, which can motivate stakeholders to collaborate in learning about the physical causes of building defects as well as about other key aspects such as fault, finances consequences, and procedural causes.

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Eksperimenter og politologisk forskning: Muligheder og begrænsninger

Cited by 3 publications

References 21 publications

Dislodgement and mortality challenges when restoring shallow mussel beds (Mytilus edulis) in a Danish estuary

Dislodgement and mortality challenges when restoring shallow mussel beds (Mytilus edulis) in a Danish estuary

Lessons Learned from Different Types of Building Defect Information Sources

Lessons Learned from Information Sources on Building Defect Studies

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