Shell‐shape and morphometric variability in Mytilus galloprovincialis from micro‐tidal environments: responses to different hydrodynamic drivers          下载免费PDF全文

Vanessa Moschino  Monica Bressan  Luigi Cavaleri  Luisa Da Ros 《Marine Ecology》2015,36(4):1440-1453

Tidal conditions differently influence inter‐tidal organisms in terms of general physiological and metabolic responses. In this study we investigated the morphological response in shells of Mytilus galloprovincialis native to different micro‐tidal coastal environments in the Northern Adriatic Sea. Our purpose was to highlight the ecophenotypic variability across tidal levels and to elucidate how tidal currents and waves produced by anthropogenic activities may play a part in modulating shell morphology. Three sampling sites were selected: an open‐sea area 15 km off‐shore and two sites within the lagoon of Venice, the first near one of its three inlets, and the other one in the proximity of Venice city centre. At each sampling site, organisms were seasonally collected at different depths within their vertical zonation, either in the inter‐tidal zone – i.e. at both the highest and lowest tide zonation limits, and subtidally. The mussel shells were analysed by investigation of their morphometric relationships (height/length and width/length ratios) and by elliptic Fourier analysis of the shell contours. Shell thickness and condition index were also evaluated for a better comprehension of energy allocation/partitioning. Estimates based on long‐term measurements, visual observation, wind statistics and wave growth laws allowed an evaluation of the forces acting on shells. At the open‐sea site, the observed phenotypic variability of both shell shape and thickness was clearly related to the tidal vertical zonation. At the two lagoon sites, the currents generated by tidal flow through the inlet and the waves caused by the frequent passage of boats influenced both shell shape and thickness. A trade‐off between protection and growth was apparent along the tide gradient, as emphasized by the differences in the partitioning and allocation of energy between shell and flesh production.  相似文献   

Feature detection and description for image matching:from hand-crafted design to deep learning     

Lin Chen  Franz Rottensteiner  Christian Heipke 《地球空间信息科学学报》2021,24(1):58-74

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Development of a benthic index to assess sediment quality in the Tampa Bay Estuary   总被引：1，自引：0，他引：1  

Malloy KJ  Wade D  Janicki A  Grabe SA  Nijbroek R 《Marine pollution bulletin》2007,54(1):22-31

The identification, remedial treatment, and monitoring of contaminated sediments are among the priorities for managers of the Tampa Bay Estuary. Tampa Bay, as an urbanized estuary, is subject to the input of watershed sources of chemical contaminants, including metals, pesticides, and organic chemicals. Although the use of biological indicators and their incorporation into multi-metric indices is not new, the refinement and applications of such techniques for determining environmental condition still require further development and exploration. We present a single Tampa Bay Benthic Index (TBBI) that was developed specifically for Tampa Bay. Stepwise discriminant analysis was applied to a comprehensive list of potential benthic metrics. Results from the stepwise procedure identified the metrics that best discriminated between "healthy" and "degraded" conditions, as defined by sediment contaminant effect levels and dissolved oxygen. Discriminant analysis was then applied to the resultant three variables to determine the linear combination for the index.  相似文献   

The consumption of space: Land, capital and place in the New Zealand wine industry   总被引：1，自引：0，他引：1  

John Overton 《Geoforum》2010,41(5):752-762

Geographers have developed a keen interest in the social production of space - in the way meanings and values are ascribed to places as a result of changing social, cultural and political processes. There is a need to explore this approach further, seeing how social and economic values of places are inter-related and how these values are constructed in often deliberate and concerted ways. There is also a need to explore how such values are consumed: how the values in place are traded, appropriated and redistributed, both through the products of places and in land markets. This paper examines the New Zealand wine industry where certain wine regions have been identified and developed in ways which attempt to emphasise their distinctiveness in terms of wine quality and thus enhance the value of the wine produced. Different strategies have been employed in this process of place construction and this reflects the differential role of capital, striving on the one hand to increase the price and marketability of the products of distinctive places but, on the other, careful not to over-inflate land values and thus restrict further expansion. The paper suggests that the issue of consumption of space, involving a complex relationship amongst land, capital and place, is worthy of further exploration.  相似文献   

内蒙古大型银矿集区地球化学预测   总被引：3，自引：1，他引：2  

申伍军  王学求 《地球学报》2010,31(3):449-455

如何利用地球化学填图数据预测潜在大型矿集区是寻找大型矿床亟待解决的问题。本文利用1:20万区域化探扫面数据和1:100万中蒙边界地球化学填图数据进行综合研究, 在全区共圈出面积大于1000 km2银的地球化学省40个, 其中具有良好Ag-Pb-Zn综合异常的有31处。内蒙已发现的4处大型银矿有3处位于地球化学省内, 已发现的11处中型银矿有10处位于地球化学省或区域异常内, 这说明大型银矿与地球化学省有高度的相关性。大型银矿区银异常强度(异常内银平均含量/背景含量)大于1.5。利用面金属量模型和地球化学块体模型对31处潜在的大型银矿区的潜在资源量进行了预测。  相似文献   

洞庭盆地中更新世洞庭湖组砾石特征及其意义   总被引：1，自引：0，他引：1  

陈建成  柏道远  李长安  周柯军  黄文义  陈渡平 《华南地质与矿产》2010,(4):16-22

对位于洞庭盆地安乡凹陷东南部的两护村ZKC1孔中更新世洞庭湖组砾石层进行了粒度和砾态的统计分析。结果表明,砾石的粒度变化反映出2个较大尺度的由大→小的旋回,早旋回由洞庭湖组下段砂砾层组成,晚旋回由洞庭湖组中段上部的砂砾层组成,反映出中更新世早-中期安乡凹陷的两次由慢→快的幕式沉降过程。在上述2个大的粒度旋回之上,叠加有多个更小尺度的砾石粗、细变化,主要与气候干湿的频繁波动有关。洞庭湖组中段顶部砾石的磨圆度明显偏低,反映其沉积时期盆地沉降和周缘隆起区抬升活动的增强。  相似文献   

高光谱遥感土地质量指标信息提取研究进展     

姚阔  郭旭东  周冬  南颖  石晓平 《地理与地理信息科学》2014,30(6)

高光谱遥感技术已成为提取土地质量指标的前沿技术之一。该文回顾了国内外高光谱遥感技术在土地质量指标提取中的研究进展,总结归纳了作为土地生态系统载体的土壤属性质量指标和反映生态系统结构功能的质量指标中的土壤有机质、全氮、土壤水分、铁氧化物、土壤重金属、土壤质地、土壤盐分、植被覆盖度、生物量、指示种10个指标的提取、敏感波段选择与反演方法,指出研究中存在的问题,最后展望了高光谱遥感技术在土地质量指标提取研究中的应用前景。  相似文献   

导管架式海上风力发电支撑结构振型扩阶方法     

李炜  王卫英  刘福顺  陈文文  彭春涪  卢洪超 《中国海洋大学学报(自然科学版)》2014,44(3)

提出1种适用于海上风力发电支撑结构的模态振型扩阶方法。该方法无需借助转换矩阵实现振型扩阶,而是依靠实测模态并通过修正有限元模型对应振型在未测试自由度的振型值而获得空间完备的模态振型,并且所发展的方法在一定程度上可以忽略有限元模型存在的建模误差,是1种直接的估算方法,计算效率相对较高。文中采用三桩导管架式海上风力发电支撑结构验证提出方法的正确性以及在低阶模态振型扩阶上的优越性。数值结果表明,该方法对传感器位置、数量依赖程度低,尤其对于海上风电结构,仅在结构的水深较浅部位布置少数传感器即可比较精确的实现低阶模态振型扩阶,具有良好的工程应用前景。  相似文献   

Ecological indicators showing the succession of macrofauna communities in Sonneratia apetala artificial mangrove wetlands on Qi’ao Island at Zhuhai, South China     

TANG Yijie  FANG Zhanqiang  ZHANG Zaiwang  ZHONG Yanting  CHEN Kang  LIU Benhan  FAN Junjie  XIONG Tiantian  LU Xiaosheng 《海洋学报(英文版)》2014,33(8):62-72

The Sonneratia apetala artificial mangroves in the intertidal zone of Da Wei Bay at Qi’ao Island of Zhu-hai, South China were chosen as the macrofauna succession plots while bare tidal flats of the same size were established as control plots in surrounding interference-free areas. Conventional change indicators of community structure, such as biomass and biodiversity, and indicators, such as exergy and specific exergy, which reflect the information change of overall communities, were used to analyze the succession of macro-fauna communities inS. apetala artificial mangroves. The similarities and differences in variation tendency of the different ecological indicators and their reflected ecological principles were compared. The results showed that from D-1 to D-1275 after plantingS. apetala, the biomass of the macrofauna communities first increased, which was then followed by an increase in the network relationship between the macrofauna communities （analysis of the Pielou evenness index and Shannon-Wiener diversity index）. The system in-formation （specific exergy） increased the slowest. Between D-1460 and D-2370 after plantingS. apetala, there was a decrease in biomass, network structure, and system information in the succession plots. After the decrease in the system information （the specific exergy）, there was a decline in the network relationships （Pielou evenness index and Shannon-Wiener diversity index）. Biomass was the last indicator to decrease. The similarities and differences among the different ecological indicators varied during the succession pro-cess, which reflected the relativity and differences among the indicators. This study suggested that, although the species diversity index can be an effective indicator of two types of changes （network structure and system information）, it was quite clear that species diversity measurement was not suitable for expressing the changes in biomass during the succession process. While exergy and specific exergy can provide useful information  相似文献   

The use of ocean color remote sensing in integrated coastal zone management—A case study from Himmerfjärden,Sweden     

《Marine Policy》2014

In this study the use of ocean color data as a diagnostic tool in integrated coastal zone management was investigated as part of the Science Policy Integration for Coastal Systems Assessment (SPICOSA) project. Parallel to this, an operational coastal monitoring system has been set up in close collaboration with end-users. The core work of the bio-optical part in the project was to develop Secchi depth and attenuation of light as indicators for coastal zone management, by linking remote sensing with the socio-economic and ecological model developed in SPICOSA. The article emphasizes the benefits of stakeholder involvement and end-user feedback for efficient and improved system development. Furthermore, conceptual models were developed on how to integrate remote sensing data into coastal zone management and into a physical-biological model of the Baltic Sea. One of the work packages in the SPICOSA project was academic training. In this work package, on-line teaching material in the field of remote sensing and bio-optics was developed and disseminated on the SETnet web page. The article presented here may act as supportive material for training in bio-optics and remote sensing.  相似文献