Survey methods

调查方法
  • 文章类型: Journal Article
    背景:调查驱动的研究是进行大规模数据收集的可靠方法。采用混合模式调查设计的调查人员报告了调查研究的好处,包括更大的参与度,改善调查访问,和更高的反应率。混合模式调查设计结合了2个或更多的数据收集模式,包括网络,电话,面对面,和邮件。混合模式调查设计的类型包括同时(即,并发),顺序,延迟并发,和适应性。本文介绍了一种使用混合模式调查设计的研究协议,以探索管理员和护士从业人员(NP)报告的健康IT(HIT)成熟度和护理环境,分别,在美国疗养院(NHs)。
    目的:本研究的目的是使用2种调查工具在研究中使用混合模式调查设计来描述研究方案,以探索美国NHs的HIT成熟度和NP护理环境。
    方法:我们正在对1400个NH管理员和NP进行全国性调查。两个数据集(即,护理比较和IQVIA)用于随机识别符合条件的设施。该协议包含2项调查,以探索HIT成熟度(由管理员收集的调查1)如何影响NPs工作的护理环境(由NPs收集的调查2)。管理员收集的更高的HIT成熟度表明IT能力更强,使用,并融入住院医师护理,临床支持,和行政活动。NP护理环境调查测量关系,独立实践,资源可用性,和能见度。研究小组进行了3个迭代焦点小组,包括14名临床医生(NP和NH专家)和来自2个国家调查小组的招聘人员,这些小组在使用混合模式设计方面取得了共识。在焦点小组中,我们确定了在这些设置中使用混合模式设计的利弊。我们确定,具有定期跟进呼叫的2种混合模式设计(延迟并发模式和顺序模式)对于招募NH管理员是有效的,而并发混合模式设计对于招募NP是最好的。
    结果:该项目的参与者招募于2023年6月开始。截至2024年4月22日,共返回了98个HIT成熟度调查和81个NP调查。预计到2025年7月招聘NH管理员和NP。大约71%的HIT成熟度调查是使用电子链接提交的,23%是在向管理员发送QR码后提交的。大约95%的NP调查是通过电子调查链接返回的。
    结论:团队确定的NH研究的混合模式设计的优点是延迟并发,并发,与单一模式交付方法相比,向潜在参与者提供调查的顺序混合模式方法节省了招聘时间。单模式策略的一个缺点是降低了多功能性和对不同组织能力的适应性(例如,访问电子邮件和防火墙),这可能会降低反应率。
    DERR1-10.2196/56170。
    BACKGROUND: Survey-driven research is a reliable method for large-scale data collection. Investigators incorporating mixed-mode survey designs report benefits for survey research including greater engagement, improved survey access, and higher response rate. Mix-mode survey designs combine 2 or more modes for data collection including web, phone, face-to-face, and mail. Types of mixed-mode survey designs include simultaneous (ie, concurrent), sequential, delayed concurrent, and adaptive. This paper describes a research protocol using mixed-mode survey designs to explore health IT (HIT) maturity and care environments reported by administrators and nurse practitioners (NPs), respectively, in US nursing homes (NHs).
    OBJECTIVE: The aim of this study is to describe a research protocol using mixed-mode survey designs in research using 2 survey tools to explore HIT maturity and NP care environments in US NHs.
    METHODS: We are conducting a national survey of 1400 NH administrators and NPs. Two data sets (ie, Care Compare and IQVIA) were used to identify eligible facilities at random. The protocol incorporates 2 surveys to explore how HIT maturity (survey 1 collected by administrators) impacts care environments where NPs work (survey 2 collected by NPs). Higher HIT maturity collected by administrators indicates greater IT capabilities, use, and integration in resident care, clinical support, and administrative activities. The NP care environment survey measures relationships, independent practice, resource availability, and visibility. The research team conducted 3 iterative focus groups, including 14 clinicians (NP and NH experts) and recruiters from 2 national survey teams experienced with these populations to achieve consensus on which mixed-mode designs to use. During focus groups we identified the pros and cons of using mixed-mode designs in these settings. We determined that 2 mixed-mode designs with regular follow-up calls (Delayed Concurrent Mode and Sequential Mode) is effective for recruiting NH administrators while a concurrent mixed-mode design is best to recruit NPs.
    RESULTS: Participant recruitment for the project began in June 2023. As of April 22, 2024, a total of 98 HIT maturity surveys and 81 NP surveys have been returned. Recruitment of NH administrators and NPs is anticipated through July 2025. About 71% of the HIT maturity surveys have been submitted using the electronic link and 23% were submitted after a QR code was sent to the administrator. Approximately 95% of the NP surveys were returned with electronic survey links.
    CONCLUSIONS: Pros of mixed-mode designs for NH research identified by the team were that delayed concurrent, concurrent, and sequential mixed-mode methods of delivering surveys to potential participants save on recruitment time compared to single mode delivery methods. One disadvantage of single-mode strategies is decreased versatility and adaptability to different organizational capabilities (eg, access to email and firewalls), which could reduce response rates.
    UNASSIGNED: DERR1-10.2196/56170.
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  • 文章类型: Journal Article
    背景:工作场所的欺凌和骚扰越来越被认为是与不良心理健康和自杀有关的危险暴露。建筑业是所有职业中自杀率最高的行业之一,并积极参与消除心理健康支持的努力。然而,人们不太重视减少可能导致建筑工人福祉不佳的因素。
    方法:作为解决建筑中与工作相关的心理健康决定因素的一步,我们与一个大型建筑工会合作,调查成员的虐待行为经历。我们调整了标准化问卷,以更好地适应该行业,例如通过评估“走得太远的欺凌行为”和学徒地位。此外,我们包括了关于虐待报告的问题,关注滥用的影响,以及开放的回应,让参与者分享他们的观点。
    结果:我们开发并测试了一项精心定制的虐待行为调查。对调查的答复(超过3300份,包括500份叙述性答复)将有助于数据驱动的干预措施,有可能预防和解决滥用问题。本文介绍了与工会合作的调查开发过程,与施工上下文相关的滥用领域,和调查协议。
    结论:通过共同努力,我们开发了一种工具,以了解建筑中的虐待行为和基准成功,以减少欺凌和骚扰的不利经历。我们建议在整个行业使用它,以减少对这种福祉危害的暴露。
    BACKGROUND: Bullying and harassment in the workplace are increasingly recognized as hazardous exposures associated with poor mental health and suicidality. The construction sector has one of the highest rates of suicide among all occupations and is actively engaged in efforts to destigmatize mental health support. However, there has been less focus on reducing factors that may be contributing to poor well-being among construction workers.
    METHODS: As a step toward addressing work-related determinants of mental health in construction, we collaborated with a large construction union to survey members about their experiences of abusive conduct. We adapted standardized questionnaires to better suit the sector, such as by assessing \"hazing that went too far\" and apprenticeship status. Additionally, we included questions on reporting of abuse, concern about the impacts of abuse, and an open-response to allow participants to share their perspectives.
    RESULTS: We developed and tested a carefully-tailored survey of abusive conduct. The responses to the survey (over 3300, including 500 narrative responses) will facilitate data-driven interventions with the potential to prevent and address abuse. This paper describes the survey development process in collaboration with the union, domains of abuse that are relevant to the construction context, and the survey protocol.
    CONCLUSIONS: Through a collaborative effort, we developed an instrument to understand abusive conduct in construction and benchmark success in reducing adverse experiences of bullying and harassment. We recommend its use throughout the sector to reduce exposure to this well-being hazard.
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  • 文章类型: Journal Article
    响应式调查设计是一种旨在通过使用来自现场的传入数据进行设计更改来提高调查效率或质量的技术。这项技术是在大型国家调查中首创的,但是这些工具也可以应用于社会学家最常用的小规模调查。我们展示了小规模的响应式调查设计,基于列表的关于性行为不端的学生抽样调查。我们研究了个人激励水平和两阶段响应设计的影响,并改变了接触方式,以此作为限制此类调查数据中无反应偏差可能性的方法。我们的分析表明,采用两阶段设计,引入电话和面对面提醒来完成调查,与较高的激励水平相比,回应者的回应率和特征会产生更大的变化。这些发现为社会学家设计特殊人群或敏感话题的小规模调查提供了工具。
    Responsive survey design is a technique aimed at improving the efficiency or quality of surveys by using incoming data from the field to make design changes. The technique was pioneered on large national surveys, but the tools can also be applied on the smaller-scale surveys most commonly used by sociologists. We demonstrate responsive survey design in a small-scale, list-based sample survey of students on the topic of sexual misconduct. We investigate the impact of individual incentive levels and a two-phase responsive design with changes to mode of contact as approaches for limiting the potential of nonresponse bias in data from such surveys. Our analyses demonstrate that a two-phase design introducing telephone and face-to-face reminders to complete the survey can produce stronger change in response rates and characteristics of those who respond than higher incentive levels. These findings offer tools for sociologists designing smaller-scale surveys of special populations or sensitive topics.
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  • 文章类型: Journal Article
    在英格兰和威尔士,每年大约有82,000人被关进监狱。有限的研究调查了这一人群的癌症,没有人探索被监禁的癌症患者的经历。本研究旨在弥补这一差距。
    我们进行了55次半结构化,定性,录音采访:被监禁的癌症患者(n=24),保管人员(n=6),监狱医护人员(n=16)和肿瘤学专家(n=9)。数据收集于2019/07/10-2020/20/03。监狱医护人员招募了患者,并进行了面对面的采访。通过专业网络招募专业人员,面谈是面对面或通过电话进行的。转录访谈使用反身性主题分析进行了分析。我们还分析了在监狱中(n=78)和普通人群(n=390)被诊断的患者的相关国家癌症患者体验调查(NCPES)问题。
    我们的研究结果突出了被监禁者癌症治疗的复杂性。我们确定了三个核心主题:控制和选择,通信,照顾和监护.虽然监狱中的人遵循与社区中的人相似的诊断途径,诊断存在其他障碍,包括健康素养,全科医生预约预约系统以及监狱和肿瘤科工作人员之间的沟通。监狱中控制与选择之间的紧张关系影响了癌症护理经验的各个方面,例如症状管理和访问癌症信息。NCPES结果支持定性调查结果,并显示监狱中的人报告的经历明显比普通人群差。
    我们的研究结果表明,在监护环境中癌症护理的复杂性,确定公平癌症护理提供的障碍和促成因素,并提供有关如何改善该人群护理的见解。
    国立卫生与社会保健研究所提供研究计划16/52/53和战略优先事项基金2019/20通过萨里大学研究英格兰。
    UNASSIGNED: Approximately 82,000 people are in prison annually in England and Wales. Limited research has investigated cancer in this population and none has explored experiences of imprisoned people with cancer. This study aimed to address this gap.
    UNASSIGNED: We conducted 55 semi-structured, qualitative, audio-recorded interviews with: imprisoned people with cancer (n = 24), custodial staff (n = 6), prison healthcare staff (n = 16) and oncology specialists (n = 9). Data were collected 07/10/2019-20/03/2020. Patients were recruited by prison healthcare staff and interviews were conducted face-to-face. Professionals were recruited via professional networks and interviews were conducted face-to-face or via telephone. Transcribed interviews were analysed using reflexive thematic analysis. We also analysed relevant National Cancer Patient Experience Survey (NCPES) questions for those diagnosed in prison (n = 78) and in the general population (n = 390).
    UNASSIGNED: Our findings highlight the complexities of cancer care for imprisoned people. We identified three core themes: control and choice, communication, and care and custody. Whilst people in prison follow a similar diagnostic pathway to those in the community, additional barriers to diagnosis exist including health literacy, the General Practitioner appointment booking system and communication between prison and oncology staff. Tensions between control and choice in prison impacted aspects of cancer care experience such as symptom management and accessing cancer information. NCPES results supported the qualitative findings and showed people in prison reported significantly poorer experiences than in the general population.
    UNASSIGNED: Our findings demonstrate the complexity of cancer care in custodial settings, identifying barriers and enablers to equitable cancer care provision and offering insights on how to improve care for this population.
    UNASSIGNED: National Institute for Health and Social Care Research Delivery Research Programme 16/52/53 and Strategic Priorities Fund 2019/20 Research England via University of Surrey.
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  • 文章类型: Journal Article
    目的:开发并测试食品相关控制量表(FRCS),以测量长期护理食品服务中居民感知的控制。
    方法:最初开发了基于多维对照构建体的15个初始项目库。专家审查,认知访谈,一项试点研究,和因子分析用于验证仪器并评估可靠性。
    方法:在美国进行基于个人电话的认知访谈和16个熟练的护理机构。
    方法:认知访谈包括对65岁以上独立生活成年人(n=13)的便利样本,而试点研究包括熟练护理机构居住的成年人(n=166).
    方法:长期护理环境中食物相关控制的感知。
    方法:对认知访谈进行分析以开发项目。使用SAS软件进行结构方程建模和因子分析,对来自熟练护理机构居民的定量数据进行分析。
    结果:FRCS的二维结构(9项)通过因子分析证明了可靠性。用多维健康控制源量表(标准化估计值为0.430;P<0.1)证明了控制构建物内的并发有效性。
    结论:FRCS可用于确定长期护理的居民如何感知对其食物体验的控制。需要进一步测试以确定FRCS对于不同人群用途的适当性。
    OBJECTIVE: Develop and test a Food-Related Control Scale (FRCS) measuring resident-perceived control in long-term care food service.
    METHODS: A bank of 15 initial items based on a multidimensional locus of control construct was developed initially. Expert review, cognitive interviews, a pilot study, and factor analysis were used to validate the instrument and assess reliability.
    METHODS: Individual phone-based cognitive interviews and 16 skilled nursing facilities in the US.
    METHODS: Cognitive interviews included a convenience sample of independently living adults aged ≥ 65 (n = 13), whereas the pilot study included skilled nursing facility-residing adults (n = 166).
    METHODS: Perception of food-related control in a long-term care setting.
    METHODS: Cognitive interviews were analyzed to develop items. Quantitative data from skilled nursing facility residents were analyzed using SAS software for structural equation modeling and factor analysis.
    RESULTS: A 2-dimensional construct (9 items) of the FRCS demonstrated reliability with factor analysis. Concurrent validity within the locus of control construct was demonstrated with the Multidimensional Health Locus of Control Scale (standardized estimate of 0.430; P < 0.1).
    CONCLUSIONS: The FRCS may be used to determine how residents in long-term care perceive control over their food experiences. Further testing is necessary to determine the appropriateness of the FRCS for different population uses.
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  • 文章类型: Journal Article
    本文是《华尔街日报》系列文章中探讨研究设计的重要性的第二十四期(要插入的数字),流行病学方法,以及应用于营养和营养学研究的统计分析。这个正在进行的统计组合的目的是帮助注册营养师(RDN)和营养和饮食技术人员,注册(NDTR)在解释营养研究和应用科学原理产生高质量的数据分析。调查是一种用于收集有关感兴趣的主题的可报告信息的系统方法。发展中,适应和进行调查研究是一个复杂的过程,其目的是为预期目的和背景收集准确和有用的数据。这篇文章,伴随着电子调查研究的配套文章,是营养和营养学研究中数据收集和分析的调查方法概述。其目的是强调调查开发和调查管理的一般原则和组成部分,以最大程度地提高所获得数据的有效性。目标是提供实用的设计指南,并实施调查作为数据收集的方法。提供支持数字供从业人员和学生直接使用。(194字)。
    This article is part of a series of articles in the Journal of the Academy of Nutrition and Dietetics exploring the importance of research design, epidemiological methods, and statistical analysis as applied to nutrition and dietetics research. The purpose of this ongoing statistical portfolio is to assist registered dietitian nutritionists and nutrition and dietetic technicians, registered with interpreting nutrition research and applying scientific principles to produce high-quality data analysis. A survey is a systematic method for collecting reportable information on a topic of interest. Developing, adapting, and conducting survey research is a complex process; its aim is to collect accurate and useful data for the intended purpose and context. This article, which accompanies a companion article on electronic survey research, is an overview of survey methodology for data collection and analysis in nutrition and dietetics research. Its purpose is to highlight the general principles and components of survey development and survey administration that would maximize the validity of the data obtained. The goal is to provide a practical guide on the design and implementation of a survey as a method for data collection. Supporting figures are provided for use in direct application by practitioners and students.
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  • 文章类型: Journal Article
    对卫生专业人员的调查通常反应率低,近年来有所下降。我们报告使用的方法,参与率,以及2014-2022年进行的11项全国牙医问卷调查的研究时间。参与率下降(87%-25%)。与这种降低同时发生的是招募从业者的强度降低。当使用邮政邮件邀请和纸质选项时,参与率更高(84%与58%,p<.001)。在波浪中招募的研究中,完成率几乎是未招募的研究的两倍(61%vs.35%,p=.003)。研究时间从2.6到28.4周不等。使用邮政邮件和纸质完成时,研究时间最长(26.0vs.11.3周,p=.01)。在仅使用在线方法的研究中,邀请错开时的研究时间比所有邀请在一次推注中发出时更长(平均12.0和5.2,p=.04)。研究时间与参与率呈正相关(Spearmanr=.80,p=.005)。普通牙医的参加率平均比专家高12%。征聘方法,例如在波浪或阶段招募,在设计调查时应予以考虑。
    Surveys of health professionals typically have low response rates, which have decreased in recent years. We report on the methods used, participation rates, and study time for 11 national questionnaire studies of dentists conducted from 2014-2022. Participation rates decreased (87%-25%). Concurrent with this decrease was a decrease in the intensity with which the practitioners were recruited. Participation rates were higher when postal mail invitation and paper options were used (84% vs. 58%, p < .001). Completion rates were nearly twice as high in studies that recruited in waves than those that did not (61% vs. 35%, p = .003). Study time varied from 2.6 to 28.4 weeks. Study time was longest when postal mail and completion on paper were used (26.0 vs. 11.3 weeks, p = .01). Among studies using only online methods, study time was longer when invitations were staggered than when all invitations went out in one bolus (means 12.0 and 5.2, p = .04). Study time was positively correlated with participation rates (Spearman r = .80, p = .005). General dentists participated at an average of 12% higher rates than specialists. Recruitment methodology, such as recruiting in waves or stages, should be considered when designing surveys.
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  • 文章类型: Journal Article
    背景:这项研究的目的是试行一种创新的卡通视频小插图调查方法,以了解坦桑尼亚年轻人对堕胎和性关系的看法。儿童观看动画方法使用平板电脑上显示的视频来吸引年轻人参与对话。这样的对话很复杂,因为堕胎被高度污名化,无法访问,在坦桑尼亚是非法的。
    方法:卡通视频插图方法是使用平板电脑进行定量调查的一部分。为了以低风险的方式使青少年参与敏感话题,对假设的情况和委婉的表达进行了测试。定性访谈和焦点小组验证并进一步探讨了年轻受访者的观点。
    结果:结果表明,12-17岁的年轻人通常理解对堕胎的委婉表达,并且从12岁起就意识到围绕堕胎的社会污名和矛盾规范。尽管堕胎有风险,这项研究发现,青少年有时认为堕胎是允许女孩留在学校的合理解决方案。其他研究结果表明,当青少年在如何应对女学生怀孕时,他们正在考虑医疗保健服务的(非)负担能力以及对性别角色的期望。
    结论:数字数据收集,例如本研究中使用的动画儿童视图卡通视频插图,让研究人员更好地了解女孩和男孩对他们的经历和生殖健康的看法。
    儿童观点动画项目使用卡通视频小插曲来收集有关女孩和男孩(很少包括在内)对这一敏感话题的观点的定量和定性数据,因为这些年轻人正在老化并弄清楚如何在农村和城市坦桑尼亚进行性成熟。这种新颖的调查技术利用数字技术更好地吸引年轻人对敏感健康主题的看法。尽管堕胎有风险,这项研究发现,青少年有时认为堕胎是允许女孩留在学校的合理解决方案。其他研究结果表明,当青少年在如何应对女学生怀孕时,他们正在考虑医疗保健服务的(非)负担能力以及对性别角色的期望。我们认为,数字数据收集允许调查研究包括女孩和男孩,更好地了解生殖健康结果如何与他们未来的生活密不可分。
    BACKGROUND: The purpose of this study was to pilot an innovative cartoon video vignette survey methodology to learn about young people\'s perspectives on abortion and sexual relationships in Tanzania. The Animating Children\'s Views methodology used videos shown on tablets to engage young people in conversations. Such conversations are complicated because abortion is highly stigmatized, inaccessible, and illegal in Tanzania.
    METHODS: The cartoon video vignette methodology was conducted as a part of a quantitative survey using tablet computers. Hypothetical situations and euphemistic expressions were tested in order to engage adolescents on sensitive topics in low-risk ways. Qualitative interviews and focus groups validated and further explored the perspectives of the young respondents.
    RESULTS: Results indicate that 12-17 year-olds usually understand euphemistic expressions for abortion and are aware of social stigma and contradictory norms surrounding abortion from as young as age twelve. Despite the risks involved with abortion, this study finds adolescents sometimes view abortion as a reasonable solution to allow a girl to remain in school. Additional findings show that as adolescents wrestle with how to respond to a schoolgirl\'s pregnancy, they are considering both the (un)affordability of healthcare services and also expectations for gender roles.
    CONCLUSIONS: Digital data collection, such as the Animating Children\'s Views cartoon video vignettes used in this study, allows researchers to better understand girls\' and boys\' own perspectives on their experiences and reproductive health.
    The Animating Children’s Views project used cartoon video vignettes to collect quantitative and qualitative data on girls’ and boys’ (infrequently included) perspectives about this sensitive topic as these young people aged into and figured out how to navigate sexual maturity in rural and urban Tanzania. This novel survey technique leveraged digital technology to better engage young people’s perspectives about sensitive health topics. Despite the risks involved with abortion, this study finds adolescents sometimes view abortion as a reasonable solution to allow a girl to remain in school. Additional findings show that as adolescents wrestle with how to respond to a schoolgirl’s pregnancy, they are considering both the (un)affordability of healthcare services and also expectations for gender roles. We argue that digital data collection allows survey research to include girls and boys, to better understand how reproductive health outcomes are inextricably linked to their future lives.
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  • 文章类型: Journal Article
    认识到体验式教育在社会/行为科学研究培训中的价值,我们为教育博士学生设计并提供了一个调查研究项目的模拟。通过项目的三个阶段,从仪器设计到规模调查和定量分析,学生以现实和真实的方式发展成为研究人员。在本文中,我们突出优势,挑战,以及在研究生研究方法课程中应用模拟方法的结果,特别关注调查方法和定量技能开发。
    Recognizing the value of experiential education in social/behavioral science research training, we designed and offered a simulation of a survey research project for doctoral students in education. Through three phases of the project, from instrument design through scale investigation and quantitative analyses, students are developed as researchers in a realistic and authentic way. In this paper, we highlight the advantages, challenges, and outcomes from applying simulation methods within graduate research methods courses, with a specific focus on survey methodology and quantitative skill development.
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  • 文章类型: Journal Article
    海洋可再生能源发展的环境相互作用从精细尺度的直接(例如潜在的碰撞)到间接的宽尺度的水动力变化改变海洋学特征。当前的英国环境影响评估(EIA)和相关的栖息地法规评估(HRA)指南对影响顶级捕食者分布和移动(因此脆弱性)的基本过程的关注有限。本研究将多营养船舶调查(主动声学和观察者数据)与朝上的海底平台和3维流体动力学模型相结合,作为过程驱动的框架,以研究海鸟和鱼群之间的捕食者-猎物联系。仅观察者数据强调了需要测量物种丰度和分布差异的物理驱动因素。主动声学表明,需要原位(优于建模)数据来识别流体动力学的时间变化,以预测猎物,从而预测顶部捕食者的存在。在当前的监管框架内修改确定关键生境和环境协变量的方法将使EIA和HRA流程和输出更加稳健和可转移。并以更大的规模进行累积和战略一级的评估,能够对气候变化和可再生能源开采对生态系统的影响进行未来建模。
    Environmental interactions of marine renewable energy developments vary from fine-scale direct (e.g. potential collision) to indirect wide-scale hydrodynamic changes altering oceanographic features. Current UK Environmental Impact Assessment (EIA) and associated Habitats Regulations Appraisal (HRA) guidelines have limited focus on underlying processes affecting distribution and movements (hence vulnerability) of top predators. This study integrates multi-trophic ship survey (active acoustics and observer data) with an upward-facing seabed platform and 3-dimensional hydrodynamic model as a process-driven framework to investigate predator-prey linkages between seabirds and fish schools. Observer-only data highlighted the need to measure physical drivers of variance in species abundances and distributions. Active acoustics indicated that in situ (preferable to modelled) data were needed to identify temporal changes in hydrodynamics to predict prey and consequently top predator presence. Revising methods to identify key habitats and environmental covariates within current regulatory frameworks will enable more robust and transferable EIA and HRA processes and outputs, and at larger scales for cumulative and strategic-level assessments, enabling future modelling of ecosystem impacts from both climate change and renewable energy extraction.
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