Association of triacylglyceride content and transcript abundance of genes involving in lipid synthesis of nitrogen deficient Phaeodactylum tricornutum     

张琳  韩吉昌  杨官品  朱葆华  潘克厚 《中国海洋湖沼学报》2014,32(2):397-402

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Evaluation of Three Harvest Control Rules for Bigeye Tuna（Thunnus obesus） Fisheries in the Indian Ocean     

TONG Yuhe  ;CHEN Xinjun  ;Dale Kolody 《青岛海洋大学学报(英文版)》2014,(5):811-819

The stock of Bigeye tuna（Thunnus obesus） in the Indian Ocean supports an important international fishery and is considered to be fully exploited. The responsible management agency, the Indian Ocean Tuna Commission（IOTC）, does not have an explicit management decision-making framework in place to prevent over-fishing. In this study, we evaluated three harvest control rules, i） constant fishing mortality（CF）, from 0.2 to 0.6, ii） constant catch（CC）, from 60000 to 140000 t, and iii） constant escapement（CE）, from 0.3 to 0.7. The population dynamics simulated by the operating model was based on the most recent stock assessment using Stock Synthesis version Ⅲ（SS3）. Three simulation scenarios（low, medium and high productivity） were designed to cover possible uncertainty in the stock assessment and biological parameters. Performances of three harvest control rules were compared on the basis of three management objectives（over 3, 10 and 25 years）： i） the probability of maintaining spawning stock biomass above a level that can sustain maximum sustainable yield（MSY） on average, ii） the probability of achieving average catches between 0.8 MSY and 1.0 MSY, and iii） inter-annual variability in catches. The constant escapement strategy（CE=0.5）, constant fishing mortality strategy（F=0.4） and constant catch（CC=80000） were the most rational among the respective management scenarios. It is concluded that the short-term annual catch is suggested at 80000 t, and the potential total allowable catch for a stable yield could be set at 120000 t once the stock had recovered successfully. All the strategies considered in this study to achieve a ‘tolerable＇ balance between resource conservation and utilization have been based around the management objectives of the IOTC.  相似文献   

Evaluation of three harvest control rules for Bigeye Tuna (Thunnus obesus) fisheries in the Indian Ocean     

Yuhe Tong  Xinjun Chen  Dale Kolody 《中国海洋大学学报(英文版)》2014,13(5):811-819

The stock of Bigeye tuna(Thunnus obesus) in the Indian Ocean supports an important international fishery and is considered to be fully exploited. The responsible management agency, the Indian Ocean Tuna Commission(IOTC), does not have an explicit management decision-making framework in place to prevent over-fishing. In this study, we evaluated three harvest control rules, i) constant fishing mortality(CF), from 0.2 to 0.6, ii) constant catch(CC), from 60000 to 140000 t, and iii) constant escapement(CE), from 0.3 to 0.7. The population dynamics simulated by the operating model was based on the most recent stock assessment using Stock Synthesis version Ⅲ(SS3). Three simulation scenarios(low, medium and high productivity) were designed to cover possible uncertainty in the stock assessment and biological parameters. Performances of three harvest control rules were compared on the basis of three management objectives(over 3, 10 and 25 years): i) the probability of maintaining spawning stock biomass above a level that can sustain maximum sustainable yield(MSY) on average, ii) the probability of achieving average catches between 0.8 MSY and 1.0 MSY, and iii) inter-annual variability in catches. The constant escapement strategy(CE=0.5), constant fishing mortality strategy(F=0.4) and constant catch(CC=80000) were the most rational among the respective management scenarios. It is concluded that the short-term annual catch is suggested at 80000 t, and the potential total allowable catch for a stable yield could be set at 120000 t once the stock had recovered successfully. All the strategies considered in this study to achieve a ‘tolerable' balance between resource conservation and utilization have been based around the management objectives of the IOTC.  相似文献   

2012年冬季菲律宾海浮游动物丰度和生物量的水平分布   总被引：1，自引：1，他引：0  

代鲁平  李超伦  孙晓霞  吉鹏  张武昌 《海洋与湖沼》2014,45(6):1225-1233

为了解西太平洋菲律宾海浮游动物丰度和生物量的水平分布特征,于2012年11月26日至2012年12月12日对菲律宾海上层海洋(0—200m)的浮游动物进行了调查。调查站位分别位于受赤道逆流(NECC)、棉兰老流(MC)、北赤道流(NEC)和黑潮(KC)影响的海域。通过比较浮游动物的丰度和生物量(分别用干重,灰分,无灰干重和含能量等指标表示),探讨不同海流中浮游动物的分布特征。结果表明:桡足类、毛颚类和水母类是菲律宾海浮游动物的三大主要类群。调查海域浮游动物丰度为11—116ind./m3,NECC区平均丰度最高((96±28)ind./m3),然后依次是MC区和KC区,NEC区最小((26±9)ind./m3)。在浮游动物生物量(干重)方面,同样NECC区最高((3.25±1.11)mg/m3),其次为MC区,但是平均丰度最小的NEC区生物量超过KC区。造成这一差异的主要原因,可能是由于KC区的浮游动物具有更高的含水量以及较小个体所占比例较高。不同水团之间浮游动物灰分、无灰干重和含能量的分布特征与干重相一致。结合环境因子分析显示,上升流、叶绿素a、初级生产力、海流和温度等因素对浮游动物的分布具有一定影响。  相似文献   

Perceptions and preferences of commercial fishers for dedicated access privilege framework in a multispecies fishery     

《Marine Policy》2014

The decline of the world's fisheries and the inability of traditional management frameworks to maintain them, has led managers to adopt alternative management frameworks. The use of dedicated access privileges have often been shown to have varying popularity among factions within the commercial fishing industry and managers. Here, we examine commercial fishers' preference for alternative management frameworks in the context of a unique multispecies fisheries of the Florida Keys. By surveying commercial fishers, we find that that the size of operation plays no role in affecting fisher perception regarding dedicated access privileges. Furthermore, fishers who are organized are less likely to support dedicated access privilege frameworks. Overall, we do not find enough support in the fishing industry for the implementation of dedicated access privileges in the Florida Keys. These findings can provide inputs in developing effective management plans in the region.  相似文献   

Fishers' perceptions,facilitating factors and challenges of community-based no-take zones in the Sian Ka’an Biosphere Reserve,Quintana Roo,Mexico     

《Marine Policy》2014

In response to fisheries decline in the Mexican Caribbean and continuing deterioration of the Mesoamerican Reef, conservation NGOs have begun to negotiate and collaboratively design a network of no-take zones (NTZs) with three fishing cooperatives in the Sian Ka’an Biosphere Reserve (SKBR), among other places along the coast of Quintana Roo. Spiny lobster (Panulirus argus) is the target of the main fishery within cooperative concessions. Fishers are uniquely positioned to enforce and monitor NTZs and evaluate their effectiveness. This study analyzes fishers' perceptions as indicators of social acceptance of NTZs, and identifies facilitating factors and challenges of the community-based process. Consistent with similar studies, responses of fishers (89 out of a population of 124) to a semi-structured interview showed that perceptions of NTZs largely reflect fishers' concerns and interests. A high proportion of fishers accurately identified main NTZ objectives of regulation, conservation and economic improvement, as well as NTZ locations. Further, fishers cared about ecosystem sustainability and, because NTZs would not significantly limit their main economic activity, endorsed the initiative while expecting additional benefits. Declining trends in lobster catch influenced a perceived need for NTZs. Major concerns were that illegal fishers would reap NTZ benefits and that economic impacts and benefits were uncertain. Most fishers found the decision-making process inclusive, were willing to take responsibility for enforcing NTZs and believed people leading the process were trustworthy. Differences in endorsement of NTZs among cooperatives points to the importance of understanding fishers’ incentives to collaborate, and the leadership and organizational dynamics which shape participatory processes. This analysis highlights challenges in advancing NTZs in complex ecological, socio-economic and regulatory contexts. It underscores the need for community-based processes that transcend understanding of conservation measures but also invests in sustainable, operative and trustful working relationships, as well as the urgency of interdisciplinary approaches in ensuring effective design and implementation of this relatively new fishery management tool.  相似文献   

2011年南黄海辐射沙脊群海域浮游植物种类组成和密度的时空变化     

魏永杰  李伯康  曹维  蔡燕红  黄秀清  费岳军 《台湾海峡》2014,(2):190-197

于2011年2～12月,在南黄海辐射沙脊群海域设置6个采样站位,每逢双月份调查1次,研究该海域浮游植物密度及优势种的时空变化.调查共获得浮游植物87种,以硅藻种类最多.浮游植物密度呈周年双峰变化,分别在4月和8月成峰,4月峰值最大,水样浮游植物平均密度为1.59×104cells/dm3,网样浮游植物平均密度为2.71×106cells/m3,8月峰次之,水样浮游植物的平均密度为1.28×104cells/dm3,网样浮游植物平均密度为7.38×105cells/m3;浮游植物密度在2月和4月,北高南低,6月和8月中部高,外围较低,10月和12月南部高北部低.2月和4月,中肋骨条藻（Skeletonema costatum）为第一优势种,6月和12月虹彩圆筛藻（Coscinodiscus oculus-iridis）为第一优势种,8～10月琼氏圆筛藻（Coscinodiscus jonesianus）为第一优势种,枯水期（2月）铁氏束毛藻（Trichodesmium thiebautii）在局部海域形成优势.  相似文献   

Analysis on the law of occurrence of shallow geothermal energy in Zhoukou City of Henan Province,China     

XING Hui  DI Yan-song  YONG Yi 《地下水科学与工程》2014,7(3):282-287

In this paper, through data collection and field investigation, the development and utilization status of shallow geothermal energy in Zhoukou urban area was discussed. Based on the analysis of hydrogeological conditions, rock and soil structure characteristics and field test research, the spatial distribution characteristics of rock and soil in the study area were summarized. The study shows that Zhoukou City is located in the alluvial plain of Huanghuai, and the loose deposits of river alluvial genesis range 0-200 m. These loose deposits and groundwater stored in their pores are the main carriers of shallow geothermal energy. In the central part of the Yinghe River in the middle of the study area, the aquifer thickness is within 200 m, the particle size is coarser, the water-bearing degree and recharge capacity is better. On this basis, the paper uses AHP to evaluate the suitability of shallow geothermal energy development and utilization to guide the rational development and utilization of shallow geothermal energy resources.  相似文献   

银河系厚盘恒星元素丰度研究     

魏明霞  张华伟  刘晓为 《天文学进展》2006,24(1):62-72

自20世纪80年代开始的观测表明,银河系存在厚盘结构,但其形成机制至今还是一个没有解决的问题。近年来很多工作发现,厚盘恒星的α元素丰度随金属丰度的变化趋势与薄盘不同, 这种不同还表现在Al、Mn、Zn、中子俘获元素等其他元素上。结合年龄、运动学参数研究, 恒星元素丰度可以对银河系厚盘形成机制提供观测依据。  相似文献   

镇江长江豚类省级自然保护区鱼类多样性及年际变化     

潘杰  王召根  章旭日  刘凯 《广东海洋大学学报》2021,(1)

【目的】调查了解镇江豚类保护区鱼类资源状况,丰富鱼类资源本底数据。【方法】于2013、2016和2019年,分别开展3次渔业资源调查,对该区域鱼类种类组成、优势种、体型大小及群落多样性进行统计分析。【结果】共记录鱼类68种属于7目13科47属;鲤形目(Cypriniformes)鱼类种类占比较为稳定,鲇形目(Siluriformes)鱼类资源量有下降趋势,鲈形目(Siluriformes)鱼类种类占比上升明显;不同年份优势种替代较为明显;2016年的物种丰富度指数和多样性指数最高,分别为6.528、3.026。【结论】保护区鱼类资源较为丰富,但不同年份鱼类群落变化较为明显,渔业资源面临小型化趋势。  相似文献