Planktonic and benthic microalgal community composition as indicators of terrestrial influence on a fringing reef in Ishigaki Island, Southwest Japan   总被引：1，自引：0，他引：1  

Blanco AC  Nadaoka K  Yamamoto T 《Marine environmental research》2008,66(5):520-535

Microalgal-based indicators were used to assess terrestrial influence on Shiraho coral reef of Ishigaki Island (Okinawa, Japan). A typhoon occurred on 4-5 August 2005 and sampling were made on three occasions thereafter (6, 8, and 11 August). Pre-typhoon sampling was conducted on 26 July. The typhoon-enhanced terrestrial discharges increased reef nutrient levels (e.g. average NO(3)(-)-N: 0.088mg/L pre-typhoon to 0.817mg/L post-typhoon). This elevated chlorophyll-a concentrations by four times and shifted phytoplankton composition (spectral class-based) from an initial dominance of diatoms and green microalgae to the dominance of bluegreen microalgae (cyanobacteria) and cryptophytes. Cyanobacteria later increased by more than 200% and accounted for as much as 80% of total chl-a ( approximately 0.29microg/L), possibly assisted by favorable nutrient availability. In outer reef waters, diatoms and green microalgae predominated whereas cyanobacteria and cryptophytes were nearly undetectable. Due to detrital decomposition and river discharge, the CDOM was much higher in the inner reef than in the outer reef. Benthic bluegreen microalgae were relatively more abundant in areas close to the river mouth and coastal agricultural fields. At these locations, nutrient concentrations were much higher due to river discharge and potentially significant groundwater discharge. Thus, phytoplankton and benthic microalgae can serve as indicators of terrestrial influence on coral reefs.  相似文献   

EAF implementation in Southern Africa: Lessons learnt     

Barbara Paterson  Samantha L. Petersen   《Marine Policy》2010,34(2):276-292

The practical implementation of an ecosystem approach to fisheries (EAF) management has proved difficult to achieve. Without simple and structured guidelines for implementing an EAF, managers are grappling with the complexity of implementation and the need to prioritise resources and management actions. Ecological risk assessment has been put forward as a structured procedure. There is a need to review regularly whether progress is being made in addressing the issues and priorities identified through ecological risk assessment. Such reviews require a framework providing clear objectives for the respective fishery and delineating the steps required towards their achievement. This paper proposes a generic framework for reviewing ecological risk assessments through stakeholder workshops. This framework is aided by a fuzzy logic tool to track EAF implementation and informs the development of proactive work plans which incorporate EAF objectives. The advantages and disadvantages of a generic and participatory approach are discussed and compared with other related methods for evaluating progress in implementing an EAF.  相似文献   

胜利油田部分岸段岸滩演化和防护问题     

吴世迎  臧启运 《海洋科学进展》1997,(4)

本文在综合我所多年实地观测资料的基础上,讨论了黄河三角洲胜利油田所辖部分岸段岸滩演化和防护问题。认为岸滩演化主要受制于黄河尾闾变化和海动力的相互作用,预测了１９９６年汛期到来前黄河入海口由北汊１南侧人工改道后,岸滩发育的基本趋势和需要重视的问题。文章也讨论了防潮堤和有关海上设施的防护问题。  相似文献   

福建气象综合业务平台融入“天擎”技术方案设计及实现          下载免费PDF全文

余永城  王笑  魏夏潞 《气象科技》2022,50(5):653-659

为加快推进福建省气象业务系统的集约化、云化转型，需要依托福建气象大数据云平台（“天擎·福建”）对业务系统进行融入改造。本文介绍了“天擎·福建”的概况、总体架构和功能，重点阐述了福建气象综合业务平台融入“天擎”的技术方案及实现方法，从平台融入“天擎”、数据源切换至“天擎”、算法纳入加工流水线、数据产品存入“天擎”、系统监控进“天镜”、前端页面改造等6个方面实现了应用融入并投入业务运行，融入后综合业务平台的数据汇聚、加工和服务全流程进一步优化和规范，系统运行效率和访问速度显著提高，为其他的业务系统融入天擎提供借鉴。  相似文献   

What happens after climate change adaptation projects end: A community-based approach to ex-post assessment of adaptation projects     

《Global Environmental Change》2023

Over the last decade, hundreds of climate change adaptation projects have been funded and implemented. Despite the importance of these first-generation adaptation projects for establishing funders and implementors’ “best practices,” very little is known about how early adaptation projects have endured, to what ends, and for whom. In this article, I propose a community-based methodology for ex-post assessment of climate change adaptation projects. This methodology contributes to recognitional justice by asking the individuals and collectives tasked with sustaining adaptation initiatives to define adaptation success and what criteria for success should be assessed. I apply this subjective assessment approach in 10 communities across Ecuador that participated in an internationally funded adaptation project that concluded in 2015. My analysis draws together participatory mapping, walking interviews with local leaders, participant observation, and surveys with former project participants. The results highlight that even adaptation projects that were deemed highly successful at their closure have uncertain futures. I find that the sustainability mechanisms that were envisioned by project implementors have not functioned, and communities are shouldering the burden of reviving failing adaptation interventions. These findings highlight that the current model of episodic funding for climate change adaptation projects and evaluation processes needs to be revisited to acknowledge the long-term challenges faced by communities. This analysis also calls attention to the importance of ex-post assessment for adaptation projects and the potential of subjective assessment approaches for building more ontological and epistemological pluralism in understandings of successful climate change adaptation.  相似文献   

卫星遥感监测城市扩展与环境变化的研究   总被引：2，自引：0，他引：2  

戴昌达  唐伶俐  陈刚  王杰生  杨幼昶 《遥感学报》1995,(1)

本文阐述应用北京地区自１９８４年至１９９２年４景秋季的ＴＭ图像，通过高精度几何配准，辐射水准归一化，热图像条纹噪声消除，各种干扰因素的识别．压抑、剔除，目标信息的增强、提取，以及背景影像的生成等图像应用处理，直接获得试区８年间城镇建设用地、绿地、水体，城市热岛等环境要素变化动态，快速制出客观反映城市扩展变化的系列图件。  相似文献   

海床基自动监测平台技术的研究应用   总被引：2，自引：1，他引：2  

孙思萍 《海洋技术学报》2003,22(3):81-84

介绍了海床基自动监测技术国内外进展，就海床基自动监测平台系统的关键技术进行了论述。海床基自动监测平台系统是携带众多海洋环境观测传感器在海底工作的、自容式综合测量装置。它可布设于河口、港湾或者近海海底，对悬浮泥沙参数、海洋动力参数、温、盐和水质进行长期、同步、自动测量；系统回收后，通过系统软件建立各种海洋动力条件下特别是大风浪条件下悬浮泥沙的运移规律；建立温、盐、水位、流速剖面和通量、水质的时空变化规律。将多个站点的监测数据进行综合处理建立起海洋水体交换生态环境的时空联系，为科学地管理、治理和利用海洋自然环境造福人们提供决策依据。  相似文献